diff --git a/abstract-document/pom.xml b/abstract-document/pom.xml
index e7fc58047..b7a348d26 100644
--- a/abstract-document/pom.xml
+++ b/abstract-document/pom.xml
@@ -29,7 +29,7 @@
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         <groupId>com.iluwatar</groupId>
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     <artifactId>abstract-document</artifactId>
     <dependencies>
diff --git a/abstract-factory/pom.xml b/abstract-factory/pom.xml
index 734020720..ec0f700a5 100644
--- a/abstract-factory/pom.xml
+++ b/abstract-factory/pom.xml
@@ -29,7 +29,7 @@
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   <artifactId>abstract-factory</artifactId>
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diff --git a/adapter/pom.xml b/adapter/pom.xml
index 476eb4dce..2c99796f4 100644
--- a/adapter/pom.xml
+++ b/adapter/pom.xml
@@ -29,7 +29,7 @@
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diff --git a/aggregator-microservices/aggregator-service/pom.xml b/aggregator-microservices/aggregator-service/pom.xml
index 5a3490559..169d0da94 100644
--- a/aggregator-microservices/aggregator-service/pom.xml
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diff --git a/aggregator-microservices/information-microservice/pom.xml b/aggregator-microservices/information-microservice/pom.xml
index 844c2a3d7..986540344 100644
--- a/aggregator-microservices/information-microservice/pom.xml
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diff --git a/aggregator-microservices/inventory-microservice/pom.xml b/aggregator-microservices/inventory-microservice/pom.xml
index 9fee7db5b..f8844dd39 100644
--- a/aggregator-microservices/inventory-microservice/pom.xml
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diff --git a/aggregator-microservices/pom.xml b/aggregator-microservices/pom.xml
index d2f0a40dd..0133e9ea4 100644
--- a/aggregator-microservices/pom.xml
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diff --git a/api-gateway/api-gateway-service/pom.xml b/api-gateway/api-gateway-service/pom.xml
index 4e4714c56..87a1ebb5e 100644
--- a/api-gateway/api-gateway-service/pom.xml
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diff --git a/api-gateway/image-microservice/pom.xml b/api-gateway/image-microservice/pom.xml
index b5f2f504c..c29932fae 100644
--- a/api-gateway/image-microservice/pom.xml
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index 73b2326bd..471ffda7d 100644
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diff --git a/api-gateway/price-microservice/pom.xml b/api-gateway/price-microservice/pom.xml
index a39fde8a6..24e9663aa 100644
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diff --git a/async-method-invocation/pom.xml b/async-method-invocation/pom.xml
index 292eb136b..d912df965 100644
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diff --git a/bridge/pom.xml b/bridge/pom.xml
index 6ac261286..a7a3883c8 100644
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diff --git a/builder/pom.xml b/builder/pom.xml
index 7d83f6c28..6c171bef4 100644
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diff --git a/business-delegate/pom.xml b/business-delegate/pom.xml
index 3834b4c8f..c6f7e0c37 100644
--- a/business-delegate/pom.xml
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 		<groupId>com.iluwatar</groupId>
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 	<artifactId>business-delegate</artifactId>
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diff --git a/caching/pom.xml b/caching/pom.xml
index 7b1b22354..c20842a89 100644
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diff --git a/callback/pom.xml b/callback/pom.xml
index 8615c4653..4fe17d143 100644
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diff --git a/chain/pom.xml b/chain/pom.xml
index a1cbffcb2..ee3b92401 100644
--- a/chain/pom.xml
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diff --git a/command/pom.xml b/command/pom.xml
index bb5cd78ff..a27a56e54 100644
--- a/command/pom.xml
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diff --git a/composite/pom.xml b/composite/pom.xml
index 6513a104e..ace29d8d1 100644
--- a/composite/pom.xml
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diff --git a/dao/pom.xml b/dao/pom.xml
index 26c35abb0..f64eff8bc 100644
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diff --git a/data-mapper/pom.xml b/data-mapper/pom.xml
index f65b647fa..7d1b83469 100644
--- a/data-mapper/pom.xml
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 	<artifactId>data-mapper</artifactId>
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diff --git a/decorator/pom.xml b/decorator/pom.xml
index 58f2bb0ba..7ba2a4ee8 100644
--- a/decorator/pom.xml
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diff --git a/delegation/pom.xml b/delegation/pom.xml
index 33592dd82..2fca225b8 100644
--- a/delegation/pom.xml
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diff --git a/dependency-injection/pom.xml b/dependency-injection/pom.xml
index d8be9fcff..3472da240 100644
--- a/dependency-injection/pom.xml
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diff --git a/double-checked-locking/pom.xml b/double-checked-locking/pom.xml
index f8ac5fa2e..239bcf870 100644
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diff --git a/double-dispatch/pom.xml b/double-dispatch/pom.xml
index 8896abd9f..4f31b2e7e 100644
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diff --git a/event-aggregator/pom.xml b/event-aggregator/pom.xml
index 1b1f289b2..b7de6e01b 100644
--- a/event-aggregator/pom.xml
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 		<groupId>com.iluwatar</groupId>
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diff --git a/event-driven-architecture/pom.xml b/event-driven-architecture/pom.xml
index cccf39088..99ed39891 100644
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     <artifactId>event-driven-architecture</artifactId>
diff --git a/execute-around/pom.xml b/execute-around/pom.xml
index 23a0a4a15..60bb6d0ab 100644
--- a/execute-around/pom.xml
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diff --git a/facade/pom.xml b/facade/pom.xml
index a526243a1..e0e0f4a4d 100644
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diff --git a/factory-kit/pom.xml b/factory-kit/pom.xml
index ea2aa5976..6c936de5c 100644
--- a/factory-kit/pom.xml
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diff --git a/factory-method/pom.xml b/factory-method/pom.xml
index 7e1cfd28f..5081ecf99 100644
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diff --git a/feature-toggle/pom.xml b/feature-toggle/pom.xml
index cf479dd0a..78c182af9 100644
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index 2e4129b2d..ca5e115d0 100644
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diff --git a/flux/pom.xml b/flux/pom.xml
index bd454ca23..c07cca157 100644
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diff --git a/flyweight/pom.xml b/flyweight/pom.xml
index a4221d762..959fa5548 100644
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index c8f136ca8..2a448cffe 100644
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diff --git a/half-sync-half-async/pom.xml b/half-sync-half-async/pom.xml
index 5b6ce56b1..076dfb44d 100644
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diff --git a/hexagonal/pom.xml b/hexagonal/pom.xml
index 54f81cf14..e9e2a502d 100644
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diff --git a/intercepting-filter/pom.xml b/intercepting-filter/pom.xml
index 6ef1e25bc..6bb6f95cc 100644
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diff --git a/interpreter/pom.xml b/interpreter/pom.xml
index a0003672a..9f5dd31f3 100644
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diff --git a/iterator/pom.xml b/iterator/pom.xml
index dcd70f809..484030a33 100644
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+		<version>1.13.0-SNAPSHOT</version>
 	</parent>
 	<groupId>com.iluwatar.layers</groupId>
 	<artifactId>layers</artifactId>
diff --git a/lazy-loading/pom.xml b/lazy-loading/pom.xml
index 37b321aec..fe6d44c78 100644
--- a/lazy-loading/pom.xml
+++ b/lazy-loading/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.12.0-SNAPSHOT</version>
+    <version>1.13.0-SNAPSHOT</version>
   </parent>
   <artifactId>lazy-loading</artifactId>
   <dependencies>
diff --git a/mediator/pom.xml b/mediator/pom.xml
index 7f3209479..a6cdd028e 100644
--- a/mediator/pom.xml
+++ b/mediator/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.12.0-SNAPSHOT</version>
+    <version>1.13.0-SNAPSHOT</version>
   </parent>
   <artifactId>mediator</artifactId>
   <dependencies>
diff --git a/memento/pom.xml b/memento/pom.xml
index b7355784c..a320f186c 100644
--- a/memento/pom.xml
+++ b/memento/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.12.0-SNAPSHOT</version>
+    <version>1.13.0-SNAPSHOT</version>
   </parent>
   <artifactId>memento</artifactId>
   <dependencies>
diff --git a/message-channel/pom.xml b/message-channel/pom.xml
index 3afc5b32e..cbeba7a75 100644
--- a/message-channel/pom.xml
+++ b/message-channel/pom.xml
@@ -30,7 +30,7 @@
 	<parent>
 		<groupId>com.iluwatar</groupId>
 		<artifactId>java-design-patterns</artifactId>
-		<version>1.12.0-SNAPSHOT</version>
+		<version>1.13.0-SNAPSHOT</version>
 	</parent>
 	<artifactId>message-channel</artifactId>
 	<dependencies>
diff --git a/model-view-controller/pom.xml b/model-view-controller/pom.xml
index 0ae6a6fc6..3c01f6e8d 100644
--- a/model-view-controller/pom.xml
+++ b/model-view-controller/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.12.0-SNAPSHOT</version>
+    <version>1.13.0-SNAPSHOT</version>
   </parent>
   <artifactId>model-view-controller</artifactId>
   <dependencies>
diff --git a/model-view-presenter/pom.xml b/model-view-presenter/pom.xml
index e0a3c57fb..0aad02b27 100644
--- a/model-view-presenter/pom.xml
+++ b/model-view-presenter/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.12.0-SNAPSHOT</version>
+    <version>1.13.0-SNAPSHOT</version>
   </parent>
   <artifactId>model-view-presenter</artifactId>
   <name>model-view-presenter</name>
diff --git a/monad/pom.xml b/monad/pom.xml
index b737e2174..7f128272d 100644
--- a/monad/pom.xml
+++ b/monad/pom.xml
@@ -29,7 +29,7 @@
     <parent>
         <groupId>com.iluwatar</groupId>
         <artifactId>java-design-patterns</artifactId>
-        <version>1.12.0-SNAPSHOT</version>
+        <version>1.13.0-SNAPSHOT</version>
     </parent>
     <artifactId>monad</artifactId>
     <dependencies>
diff --git a/monostate/pom.xml b/monostate/pom.xml
index bb246d38c..64ee52abe 100644
--- a/monostate/pom.xml
+++ b/monostate/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.12.0-SNAPSHOT</version>
+    <version>1.13.0-SNAPSHOT</version>
   </parent>
   <artifactId>monostate</artifactId>
   <dependencies>
diff --git a/multiton/pom.xml b/multiton/pom.xml
index 2482c056b..0b835ed4d 100644
--- a/multiton/pom.xml
+++ b/multiton/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.12.0-SNAPSHOT</version>
+    <version>1.13.0-SNAPSHOT</version>
   </parent>
   <artifactId>multiton</artifactId>
   <dependencies>
diff --git a/mute-idiom/pom.xml b/mute-idiom/pom.xml
index 3bfc3bf8a..c138c5ed4 100644
--- a/mute-idiom/pom.xml
+++ b/mute-idiom/pom.xml
@@ -21,7 +21,7 @@
 	<parent>
 		<groupId>com.iluwatar</groupId>
 		<artifactId>java-design-patterns</artifactId>
-		<version>1.12.0-SNAPSHOT</version>
+		<version>1.13.0-SNAPSHOT</version>
 	</parent>
 	<artifactId>mute-idiom</artifactId>
 	<dependencies>
diff --git a/mutex/pom.xml b/mutex/pom.xml
index c9e0e83b7..852006cd4 100644
--- a/mutex/pom.xml
+++ b/mutex/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.12.0-SNAPSHOT</version>
+    <version>1.13.0-SNAPSHOT</version>
   </parent>
   <artifactId>mutex</artifactId>
   <dependencies>
diff --git a/naked-objects/dom/pom.xml b/naked-objects/dom/pom.xml
index be96b2456..119416694 100644
--- a/naked-objects/dom/pom.xml
+++ b/naked-objects/dom/pom.xml
@@ -16,7 +16,7 @@
 	<parent>
 		<groupId>com.iluwatar</groupId>
 		<artifactId>naked-objects</artifactId>
-		<version>1.12.0-SNAPSHOT</version>
+		<version>1.13.0-SNAPSHOT</version>
 	</parent>
 
 	<artifactId>naked-objects-dom</artifactId>
diff --git a/naked-objects/fixture/pom.xml b/naked-objects/fixture/pom.xml
index 6bbaaaeb1..46b281468 100644
--- a/naked-objects/fixture/pom.xml
+++ b/naked-objects/fixture/pom.xml
@@ -16,7 +16,7 @@
 	<parent>
 		<groupId>com.iluwatar</groupId>
 		<artifactId>naked-objects</artifactId>
-		<version>1.12.0-SNAPSHOT</version>
+		<version>1.13.0-SNAPSHOT</version>
 	</parent>
 
 	<artifactId>naked-objects-fixture</artifactId>
diff --git a/naked-objects/integtests/pom.xml b/naked-objects/integtests/pom.xml
index 68cac3790..dccaf64a3 100644
--- a/naked-objects/integtests/pom.xml
+++ b/naked-objects/integtests/pom.xml
@@ -16,7 +16,7 @@
 	<parent>
 		<groupId>com.iluwatar</groupId>
 		<artifactId>naked-objects</artifactId>
-		<version>1.12.0-SNAPSHOT</version>
+		<version>1.13.0-SNAPSHOT</version>
 	</parent>
 
 	<artifactId>naked-objects-integtests</artifactId>
diff --git a/naked-objects/pom.xml b/naked-objects/pom.xml
index d34dba9a3..b3e48dcb6 100644
--- a/naked-objects/pom.xml
+++ b/naked-objects/pom.xml
@@ -15,7 +15,7 @@
 	<parent>
 		<artifactId>java-design-patterns</artifactId>
 		<groupId>com.iluwatar</groupId>
-		<version>1.12.0-SNAPSHOT</version>
+		<version>1.13.0-SNAPSHOT</version>
 	</parent>
 
 	<artifactId>naked-objects</artifactId>
@@ -350,17 +350,17 @@
 			<dependency>
 				<groupId>${project.groupId}</groupId>
 				<artifactId>naked-objects-dom</artifactId>
-				<version>1.12.0-SNAPSHOT</version>
+				<version>1.13.0-SNAPSHOT</version>
 			</dependency>
 			<dependency>
 				<groupId>${project.groupId}</groupId>
 				<artifactId>naked-objects-fixture</artifactId>
-				<version>1.12.0-SNAPSHOT</version>
+				<version>1.13.0-SNAPSHOT</version>
 			</dependency>
 			<dependency>
 				<groupId>${project.groupId}</groupId>
 				<artifactId>naked-objects-webapp</artifactId>
-				<version>1.12.0-SNAPSHOT</version>
+				<version>1.13.0-SNAPSHOT</version>
 			</dependency>
 
 		</dependencies>
diff --git a/naked-objects/webapp/pom.xml b/naked-objects/webapp/pom.xml
index aa7d60438..762438aca 100644
--- a/naked-objects/webapp/pom.xml
+++ b/naked-objects/webapp/pom.xml
@@ -16,7 +16,7 @@
 	<parent>
 		<groupId>com.iluwatar</groupId>
 		<artifactId>naked-objects</artifactId>
-		<version>1.12.0-SNAPSHOT</version>
+		<version>1.13.0-SNAPSHOT</version>
 	</parent>
 
 	<artifactId>naked-objects-webapp</artifactId>
diff --git a/null-object/pom.xml b/null-object/pom.xml
index b765c6537..b0adad1af 100644
--- a/null-object/pom.xml
+++ b/null-object/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.12.0-SNAPSHOT</version>
+    <version>1.13.0-SNAPSHOT</version>
   </parent>
   <artifactId>null-object</artifactId>
   <dependencies>
diff --git a/object-pool/pom.xml b/object-pool/pom.xml
index 6022ef8a7..666242d1d 100644
--- a/object-pool/pom.xml
+++ b/object-pool/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.12.0-SNAPSHOT</version>
+    <version>1.13.0-SNAPSHOT</version>
   </parent>
   <artifactId>object-pool</artifactId>
   <dependencies>
diff --git a/observer/pom.xml b/observer/pom.xml
index fcc3e88aa..847a7ea89 100644
--- a/observer/pom.xml
+++ b/observer/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.12.0-SNAPSHOT</version>
+    <version>1.13.0-SNAPSHOT</version>
   </parent>
   <artifactId>observer</artifactId>
   <dependencies>
diff --git a/page-object/pom.xml b/page-object/pom.xml
index 47c13bcc5..e6f888b05 100644
--- a/page-object/pom.xml
+++ b/page-object/pom.xml
@@ -29,7 +29,7 @@
     <parent>
         <groupId>com.iluwatar</groupId>
         <artifactId>java-design-patterns</artifactId>
-        <version>1.12.0-SNAPSHOT</version>
+        <version>1.13.0-SNAPSHOT</version>
     </parent>
     <artifactId>page-object</artifactId>
     <dependencies>
diff --git a/poison-pill/pom.xml b/poison-pill/pom.xml
index b76578122..9717f5e13 100644
--- a/poison-pill/pom.xml
+++ b/poison-pill/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.12.0-SNAPSHOT</version>
+    <version>1.13.0-SNAPSHOT</version>
   </parent>
   <artifactId>poison-pill</artifactId>
   <dependencies>
diff --git a/pom.xml b/pom.xml
index 986dc493e..0b797b9b8 100644
--- a/pom.xml
+++ b/pom.xml
@@ -17,423 +17,415 @@
     LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
     OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
     THE SOFTWARE.
--->
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
-    <modelVersion>4.0.0</modelVersion>
+--><project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
 
-    <groupId>com.iluwatar</groupId>
-    <artifactId>java-design-patterns</artifactId>
-    <version>1.12.0-SNAPSHOT</version>
-    <packaging>pom</packaging>
+	<groupId>com.iluwatar</groupId>
+	<artifactId>java-design-patterns</artifactId>
+	<version>1.13.0-SNAPSHOT</version>
+	<packaging>pom</packaging>
 
-    <inceptionYear>2014</inceptionYear>
+	<inceptionYear>2014</inceptionYear>
 
-    <properties>
-        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <hibernate.version>5.0.1.Final</hibernate.version>
-        <spring.version>4.2.4.RELEASE</spring.version>
-        <spring-boot.version>1.3.3.RELEASE</spring-boot.version>
-        <spring-data.version>1.9.2.RELEASE</spring-data.version>
-        <h2.version>1.4.190</h2.version>
-        <junit.version>4.12</junit.version>
-        <compiler.version>3.0</compiler.version>
-        <coveralls.version>4.0.0</coveralls.version>
-        <jacoco.version>0.7.2.201409121644</jacoco.version>
-        <commons-dbcp.version>1.4</commons-dbcp.version>
-        <camel.version>2.16.1</camel.version>
-        <log4j.version>1.2.17</log4j.version>
-        <guava.version>19.0</guava.version>
-        <systemrules.version>1.15.1</systemrules.version>
-        <mockito.version>1.10.19</mockito.version>
-        <hierarchical-junit-runner-version>4.12.1</hierarchical-junit-runner-version>
-        <apache-httpcomponents.version>4.5.2</apache-httpcomponents.version>
+	<properties>
+		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<hibernate.version>5.0.1.Final</hibernate.version>
+		<spring.version>4.2.4.RELEASE</spring.version>
+    <spring-boot.version>1.3.3.RELEASE</spring-boot.version>
+		<spring-data.version>1.9.2.RELEASE</spring-data.version>
+		<h2.version>1.4.190</h2.version>
+		<junit.version>4.12</junit.version>
+		<compiler.version>3.0</compiler.version>
+		<coveralls.version>4.0.0</coveralls.version>
+		<jacoco.version>0.7.2.201409121644</jacoco.version>
+		<commons-dbcp.version>1.4</commons-dbcp.version>
+		<camel.version>2.16.1</camel.version>
+		<log4j.version>1.2.17</log4j.version>
+ 		<guava.version>19.0</guava.version>
+		<systemrules.version>1.15.1</systemrules.version>
+		<mockito.version>1.10.19</mockito.version>
+		<hierarchical-junit-runner-version>4.12.1</hierarchical-junit-runner-version>
+    <apache-httpcomponents.version>4.5.2</apache-httpcomponents.version>
         <htmlunit.version>2.22</htmlunit.version>
-    </properties>
-    <modules>
-        <module>abstract-factory</module>
-        <module>builder</module>
-        <module>factory-method</module>
-        <module>prototype</module>
-        <module>singleton</module>
-        <module>adapter</module>
-        <module>bridge</module>
-        <module>composite</module>
-        <module>dao</module>
-        <module>data-mapper</module>
-        <module>decorator</module>
-        <module>facade</module>
-        <module>flyweight</module>
-        <module>proxy</module>
-        <module>chain</module>
-        <module>command</module>
-        <module>interpreter</module>
-        <module>iterator</module>
-        <module>mediator</module>
-        <module>memento</module>
-        <module>model-view-presenter</module>
-        <module>observer</module>
-        <module>state</module>
-        <module>strategy</module>
-        <module>template-method</module>
-        <module>visitor</module>
-        <module>double-checked-locking</module>
-        <module>servant</module>
-        <module>service-locator</module>
-        <module>null-object</module>
-        <module>event-aggregator</module>
-        <module>callback</module>
-        <module>execute-around</module>
-        <module>property</module>
-        <module>intercepting-filter</module>
-        <module>producer-consumer</module>
-        <module>poison-pill</module>
-        <module>reader-writer-lock</module>
-        <module>lazy-loading</module>
-        <module>service-layer</module>
-        <module>specification</module>
-        <module>tolerant-reader</module>
-        <module>model-view-controller</module>
-        <module>flux</module>
-        <module>double-dispatch</module>
-        <module>multiton</module>
-        <module>resource-acquisition-is-initialization</module>
-        <module>thread-pool</module>
-        <module>twin</module>
-        <module>private-class-data</module>
-        <module>object-pool</module>
-        <module>dependency-injection</module>
-        <module>naked-objects</module>
-        <module>front-controller</module>
-        <module>repository</module>
-        <module>async-method-invocation</module>
-        <module>monostate</module>
-        <module>step-builder</module>
-        <module>business-delegate</module>
-        <module>half-sync-half-async</module>
-        <module>layers</module>
-        <module>message-channel</module>
-        <module>fluentinterface</module>
-        <module>reactor</module>
-        <module>caching</module>
-        <module>publish-subscribe</module>
-        <module>delegation</module>
-        <module>event-driven-architecture</module>
-        <module>api-gateway</module>
-        <module>factory-kit</module>
-        <module>feature-toggle</module>
-        <module>value-object</module>
-        <module>monad</module>
-        <module>mute-idiom</module>
-        <module>mutex</module>
-        <module>semaphore</module>
-        <module>hexagonal</module>
-        <module>abstract-document</module>
-        <module>aggregator-microservices</module>
+	</properties>
+	<modules>
+		<module>abstract-factory</module>
+		<module>builder</module>
+		<module>factory-method</module>
+		<module>prototype</module>
+		<module>singleton</module>
+		<module>adapter</module>
+		<module>bridge</module>
+		<module>composite</module>
+		<module>dao</module>
+		<module>data-mapper</module>
+		<module>decorator</module>
+		<module>facade</module>
+		<module>flyweight</module>
+		<module>proxy</module>
+		<module>chain</module>
+		<module>command</module>
+		<module>interpreter</module>
+		<module>iterator</module>
+		<module>mediator</module>
+		<module>memento</module>
+		<module>model-view-presenter</module>
+		<module>observer</module>
+		<module>state</module>
+		<module>strategy</module>
+		<module>template-method</module>
+		<module>visitor</module>
+		<module>double-checked-locking</module>
+		<module>servant</module>
+		<module>service-locator</module>
+		<module>null-object</module>
+		<module>event-aggregator</module>
+		<module>callback</module>
+		<module>execute-around</module>
+		<module>property</module>
+		<module>intercepting-filter</module>
+		<module>producer-consumer</module>
+		<module>poison-pill</module>
+		<module>reader-writer-lock</module>
+		<module>lazy-loading</module>
+		<module>service-layer</module>
+		<module>specification</module>
+		<module>tolerant-reader</module>
+		<module>model-view-controller</module>
+		<module>flux</module>
+		<module>double-dispatch</module>
+		<module>multiton</module>
+		<module>resource-acquisition-is-initialization</module>
+		<module>thread-pool</module>
+		<module>twin</module>
+		<module>private-class-data</module>
+		<module>object-pool</module>
+		<module>dependency-injection</module>
+		<module>naked-objects</module>
+		<module>front-controller</module>
+		<module>repository</module>
+		<module>async-method-invocation</module>
+		<module>monostate</module>
+		<module>step-builder</module>
+		<module>business-delegate</module>
+		<module>half-sync-half-async</module>
+		<module>layers</module>
+		<module>message-channel</module>
+		<module>fluentinterface</module>
+		<module>reactor</module>
+		<module>caching</module>
+		<module>publish-subscribe</module>
+		<module>delegation</module>
+		<module>event-driven-architecture</module>
+		<module>api-gateway</module>
+		<module>factory-kit</module>
+		<module>feature-toggle</module>
+		<module>value-object</module>
+		<module>monad</module>
+		<module>mute-idiom</module>
+		<module>mutex</module>
+		<module>semaphore</module>
+		<module>hexagonal</module>
+		<module>abstract-document</module>
+		<module>aggregator-microservices</module>
         <module>page-object</module>
-    </modules>
+	</modules>
 
-    <dependencyManagement>
-        <dependencies>
-            <dependency>
-                <groupId>org.hibernate</groupId>
-                <artifactId>hibernate-core</artifactId>
-                <version>${hibernate.version}</version>
-            </dependency>
-            <dependency>
-                <groupId>org.hibernate</groupId>
-                <artifactId>hibernate-entitymanager</artifactId>
-                <version>${hibernate.version}</version>
-            </dependency>
-            <dependency>
-                <groupId>org.springframework</groupId>
-                <artifactId>spring-test</artifactId>
-                <version>${spring.version}</version>
-            </dependency>
-            <dependency>
-                <groupId>org.springframework.boot</groupId>
-                <artifactId>spring-boot-dependencies</artifactId>
-                <version>${spring-boot.version}</version>
-                <type>pom</type>
-                <scope>import</scope>
-            </dependency>
-            <dependency>
-                <groupId>org.springframework.data</groupId>
-                <artifactId>spring-data-jpa</artifactId>
-                <version>${spring-data.version}</version>
-            </dependency>
-            <dependency>
-                <groupId>org.springframework</groupId>
-                <artifactId>spring-webmvc</artifactId>
-                <version>${spring.version}</version>
-            </dependency>
-            <dependency>
-                <groupId>org.springframework.boot</groupId>
-                <artifactId>spring-boot-starter-web</artifactId>
-                <version>${spring-boot.version}</version>
-            </dependency>
-            <dependency>
-                <groupId>org.apache.httpcomponents</groupId>
-                <artifactId>httpclient</artifactId>
-                <version>${apache-httpcomponents.version}</version>
-            </dependency>
-            <dependency>
-                <groupId>com.h2database</groupId>
-                <artifactId>h2</artifactId>
-                <version>${h2.version}</version>
-            </dependency>
-            <dependency>
-                <groupId>commons-dbcp</groupId>
-                <artifactId>commons-dbcp</artifactId>
-                <version>${commons-dbcp.version}</version>
-            </dependency>
-            <dependency>
-                <groupId>org.apache.camel</groupId>
-                <artifactId>camel-core</artifactId>
-                <version>${camel.version}</version>
-            </dependency>
-            <dependency>
-                <groupId>org.apache.camel</groupId>
-                <artifactId>camel-stream</artifactId>
-                <version>${camel.version}</version>
-            </dependency>
-            <dependency>
-                <groupId>junit</groupId>
-                <artifactId>junit</artifactId>
-                <version>${junit.version}</version>
-                <scope>test</scope>
-            </dependency>
-            <dependency>
-                <groupId>org.mockito</groupId>
-                <artifactId>mockito-core</artifactId>
-                <version>${mockito.version}</version>
-                <scope>test</scope>
-            </dependency>
-            <dependency>
-                <groupId>log4j</groupId>
-                <artifactId>log4j</artifactId>
-                <version>${log4j.version}</version>
-            </dependency>
-            <dependency>
-                <groupId>com.google.guava</groupId>
-                <artifactId>guava</artifactId>
-                <version>${guava.version}</version>
-            </dependency>
-            <dependency>
-                <groupId>com.github.stefanbirkner</groupId>
-                <artifactId>system-rules</artifactId>
-                <version>${systemrules.version}</version>
-                <scope>test</scope>
-            </dependency>
-            <dependency>
-                <groupId>de.bechte.junit</groupId>
-                <artifactId>junit-hierarchicalcontextrunner</artifactId>
-                <version>${hierarchical-junit-runner-version}</version>
-                <scope>test</scope>
-            </dependency>
-            <dependency>
-                <groupId>net.sourceforge.htmlunit</groupId>
-                <artifactId>htmlunit</artifactId>
-                <version>${htmlunit.version}</version>
-                <scope>test</scope>
-            </dependency>
-        </dependencies>
-    </dependencyManagement>
+	<dependencyManagement>
+		<dependencies>
+			<dependency>
+				<groupId>org.hibernate</groupId>
+				<artifactId>hibernate-core</artifactId>
+				<version>${hibernate.version}</version>
+			</dependency>
+			<dependency>
+				<groupId>org.hibernate</groupId>
+				<artifactId>hibernate-entitymanager</artifactId>
+				<version>${hibernate.version}</version>
+			</dependency>
+			<dependency>
+				<groupId>org.springframework</groupId>
+				<artifactId>spring-test</artifactId>
+				<version>${spring.version}</version>
+			</dependency>
+      <dependency>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-dependencies</artifactId>
+        <version>${spring-boot.version}</version>
+        <type>pom</type>
+        <scope>import</scope>
+      </dependency>
+            		<dependency>
+				<groupId>org.springframework.data</groupId>
+				<artifactId>spring-data-jpa</artifactId>
+				<version>${spring-data.version}</version>
+			</dependency>
+      <dependency>
+        <groupId>org.springframework</groupId>
+        <artifactId>spring-webmvc</artifactId>
+        <version>${spring.version}</version>
+      </dependency>
+      <dependency>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-web</artifactId>
+        <version>${spring-boot.version}</version>
+      </dependency>
+      <dependency>
+        <groupId>org.apache.httpcomponents</groupId>
+        <artifactId>httpclient</artifactId>
+        <version>${apache-httpcomponents.version}</version>
+      </dependency>
+			<dependency>
+				<groupId>com.h2database</groupId>
+				<artifactId>h2</artifactId>
+				<version>${h2.version}</version>
+			</dependency>
+			<dependency>
+				<groupId>commons-dbcp</groupId>
+				<artifactId>commons-dbcp</artifactId>
+				<version>${commons-dbcp.version}</version>
+			</dependency>
+			<dependency>
+				<groupId>org.apache.camel</groupId>
+				<artifactId>camel-core</artifactId>
+				<version>${camel.version}</version>
+			</dependency>
+			<dependency>
+				<groupId>org.apache.camel</groupId>
+				<artifactId>camel-stream</artifactId>
+				<version>${camel.version}</version>
+			</dependency>
+			<dependency>
+				<groupId>junit</groupId>
+				<artifactId>junit</artifactId>
+				<version>${junit.version}</version>
+				<scope>test</scope>
+			</dependency>
+			<dependency>
+				<groupId>org.mockito</groupId>
+				<artifactId>mockito-core</artifactId>
+				<version>${mockito.version}</version>
+				<scope>test</scope>
+			</dependency>
+			<dependency>
+				<groupId>log4j</groupId>
+				<artifactId>log4j</artifactId>
+				<version>${log4j.version}</version>
+			</dependency>
+			<dependency>
+				<groupId>com.google.guava</groupId>
+				<artifactId>guava</artifactId>
+				<version>${guava.version}</version>
+            		</dependency>
+			<dependency>
+				<groupId>com.github.stefanbirkner</groupId>
+				<artifactId>system-rules</artifactId>
+				<version>${systemrules.version}</version>
+				<scope>test</scope>
+			</dependency>
+			<dependency>
+				<groupId>de.bechte.junit</groupId>
+  				<artifactId>junit-hierarchicalcontextrunner</artifactId>
+  				<version>${hierarchical-junit-runner-version}</version>
+  				<scope>test</scope>
+			</dependency>
+		</dependencies>
+	</dependencyManagement>
 
 
-    <build>
-        <pluginManagement>
-            <plugins>
-                <!-- This plugin's configuration is used to store Eclipse m2e settings
-                    only. It has no influence on the Maven build itself. TODO: Remove when the
-                    m2e plugin can correctly bind to Maven lifecycle -->
-                <plugin>
-                    <groupId>org.eclipse.m2e</groupId>
-                    <artifactId>lifecycle-mapping</artifactId>
-                    <version>1.0.0</version>
-                    <configuration>
-                        <lifecycleMappingMetadata>
-                            <pluginExecutions>
-                                <pluginExecution>
-                                    <pluginExecutionFilter>
-                                        <groupId>org.jacoco</groupId>
-                                        <artifactId>
-                                            jacoco-maven-plugin
-                                        </artifactId>
-                                        <versionRange>
-                                            [0.6.2,)
-                                        </versionRange>
-                                        <goals>
-                                            <goal>prepare-agent</goal>
-                                        </goals>
-                                    </pluginExecutionFilter>
-                                    <action>
-                                        <ignore/>
-                                    </action>
-                                </pluginExecution>
-                            </pluginExecutions>
-                        </lifecycleMappingMetadata>
-                    </configuration>
-                </plugin>
-            </plugins>
-        </pluginManagement>
+	<build>
+		<pluginManagement>
+			<plugins>
+				<!-- This plugin's configuration is used to store Eclipse m2e settings
+					only. It has no influence on the Maven build itself. TODO: Remove when the
+					m2e plugin can correctly bind to Maven lifecycle -->
+				<plugin>
+					<groupId>org.eclipse.m2e</groupId>
+					<artifactId>lifecycle-mapping</artifactId>
+					<version>1.0.0</version>
+					<configuration>
+						<lifecycleMappingMetadata>
+							<pluginExecutions>
+								<pluginExecution>
+									<pluginExecutionFilter>
+										<groupId>org.jacoco</groupId>
+										<artifactId>
+											jacoco-maven-plugin
+										</artifactId>
+										<versionRange>
+											[0.6.2,)
+										</versionRange>
+										<goals>
+											<goal>prepare-agent</goal>
+										</goals>
+									</pluginExecutionFilter>
+									<action>
+										<ignore/>
+									</action>
+								</pluginExecution>
+							</pluginExecutions>
+						</lifecycleMappingMetadata>
+					</configuration>
+				</plugin>
+			</plugins>
+		</pluginManagement>
 
-        <plugins>
-            <!-- Tell maven to compile using Java 8 -->
+		<plugins>
+			<!-- Tell maven to compile using Java 8 -->
+			<plugin>
+				<groupId>org.apache.maven.plugins</groupId>
+				<artifactId>maven-compiler-plugin</artifactId>
+				<version>${compiler.version}</version>
+				<configuration>
+					<source>1.8</source>
+					<target>1.8</target>
+				</configuration>
+			</plugin>
+			<plugin>
+				<groupId>org.eluder.coveralls</groupId>
+				<artifactId>coveralls-maven-plugin</artifactId>
+				<version>${coveralls.version}</version>
+				<configuration>
+					<repoToken>jb6wYzxkVvjolD6qOWpzWdcWBzYk2fAmF</repoToken>
+				</configuration>
+			</plugin>
+			<plugin>
+				<groupId>org.jacoco</groupId>
+				<artifactId>jacoco-maven-plugin</artifactId>
+				<version>${jacoco.version}</version>
+				<!-- The following exclude configuration was added because error occurred
+					when executing "mvn clean test jacoco:report coveralls:report" -->
+				<!-- [ERROR] Failed to execute goal org.eluder.coveralls:coveralls-maven-plugin:3.1.0:report
+					(default-cli) on project java-design-patterns: I/O operation failed: No source
+					found for domainapp/dom/modules/simple/QSimpleObject.java -> [Help 1] -->
+				<configuration>
+					<excludes>
+						<exclude>domainapp/dom/modules/simple/QSimpleObject.class</exclude>
+					</excludes>
+				</configuration>
+				<executions>
+					<execution>
+						<id>prepare-agent</id>
+						<goals>
+							<goal>prepare-agent</goal>
+						</goals>
+					</execution>
+				</executions>
+			</plugin>
+
+			<!--checkstyle plug-in. checking against googles styles
+			   see config at checkstyle.xml
+			-->
+			<plugin>
+				<groupId>org.apache.maven.plugins</groupId>
+				<artifactId>maven-checkstyle-plugin</artifactId>
+				<version>2.17</version>
+				<executions>
+					<execution>
+						<id>validate</id>
+						<goals>
+							<goal>check</goal>
+						</goals>
+						<phase>validate</phase>
+						<configuration>
+							<configLocation>checkstyle.xml</configLocation>
+							<suppressionsLocation>checkstyle-suppressions.xml</suppressionsLocation>
+							<encoding>UTF-8</encoding>
+							<consoleOutput>true</consoleOutput>
+							<failsOnError>true</failsOnError>
+							<includeTestSourceDirectory>true</includeTestSourceDirectory>
+						</configuration>
+					</execution>
+				</executions>
+			</plugin>
+
+			<plugin>
+				<groupId>org.jacoco</groupId>
+				<artifactId>jacoco-maven-plugin</artifactId>
+				<version>0.7.5.201505241946</version>
+				<executions>
+					<execution>
+						<goals>
+							<goal>prepare-agent</goal>
+						</goals>
+					</execution>
+					<execution>
+						<id>report</id>
+						<phase>prepare-package</phase>
+						<goals>
+							<goal>report</goal>
+						</goals>
+					</execution>
+				</executions>
+			</plugin>
+			<plugin>
+				<groupId>org.apache.maven.plugins</groupId>
+				<artifactId>maven-surefire-plugin</artifactId>
+				<version>2.18.1</version>
+				<dependencies>
+					<dependency>
+						<groupId>org.apache.maven.surefire</groupId>
+						<artifactId>surefire-junit47</artifactId>
+						<version>2.18.1</version>
+					</dependency>
+				</dependencies>
+				<configuration>
+					<argLine>-Xmx1024M ${argLine}</argLine>
+				</configuration>
+			</plugin>
             <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-compiler-plugin</artifactId>
-                <version>${compiler.version}</version>
-                <configuration>
-                    <source>1.8</source>
-                    <target>1.8</target>
-                </configuration>
-            </plugin>
-            <plugin>
-                <groupId>org.eluder.coveralls</groupId>
-                <artifactId>coveralls-maven-plugin</artifactId>
-                <version>${coveralls.version}</version>
-                <configuration>
-                    <repoToken>jb6wYzxkVvjolD6qOWpzWdcWBzYk2fAmF</repoToken>
-                </configuration>
-            </plugin>
-            <plugin>
-                <groupId>org.jacoco</groupId>
-                <artifactId>jacoco-maven-plugin</artifactId>
-                <version>${jacoco.version}</version>
-                <!-- The following exclude configuration was added because error occurred
-                    when executing "mvn clean test jacoco:report coveralls:report" -->
-                <!-- [ERROR] Failed to execute goal org.eluder.coveralls:coveralls-maven-plugin:3.1.0:report
-                    (default-cli) on project java-design-patterns: I/O operation failed: No source
-                    found for domainapp/dom/modules/simple/QSimpleObject.java -> [Help 1] -->
-                <configuration>
-                    <excludes>
-                        <exclude>domainapp/dom/modules/simple/QSimpleObject.class</exclude>
-                    </excludes>
-                </configuration>
-                <executions>
-                    <execution>
-                        <id>prepare-agent</id>
-                        <goals>
-                            <goal>prepare-agent</goal>
-                        </goals>
-                    </execution>
-                </executions>
+              <groupId>org.apache.maven.plugins</groupId>
+              <artifactId>maven-pmd-plugin</artifactId>
+              <version>3.6</version>
+              <configuration>
+                <failOnViolation>true</failOnViolation>
+                <failurePriority>5</failurePriority>
+                <printFailingErrors>true</printFailingErrors>
+              </configuration>
+              <executions>
+                <execution>
+                  <goals>
+                    <goal>check</goal>
+                  </goals>
+                  <configuration>
+					  <excludeFromFailureFile>exclude-pmd.properties</excludeFromFailureFile>
+				  </configuration>
+                </execution>
+              </executions>
             </plugin>
 
-            <!--checkstyle plug-in. checking against googles styles
-               see config at checkstyle.xml
-            -->
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-checkstyle-plugin</artifactId>
-                <version>2.17</version>
-                <executions>
-                    <execution>
-                        <id>validate</id>
-                        <goals>
-                            <goal>check</goal>
-                        </goals>
-                        <phase>validate</phase>
-                        <configuration>
-                            <configLocation>checkstyle.xml</configLocation>
-                            <suppressionsLocation>checkstyle-suppressions.xml</suppressionsLocation>
-                            <encoding>UTF-8</encoding>
-                            <consoleOutput>true</consoleOutput>
-                            <failsOnError>true</failsOnError>
-                            <includeTestSourceDirectory>true</includeTestSourceDirectory>
-                        </configuration>
-                    </execution>
-                </executions>
-            </plugin>
+			<plugin>
+				<groupId>com.mycila</groupId>
+				<artifactId>license-maven-plugin</artifactId>
+				<version>2.11</version>
+				<configuration>
+					<header>com/mycila/maven/plugin/license/templates/MIT.txt</header>
+					<properties>
+						<owner>Ilkka Seppälä</owner>
+					</properties>
+					<skipExistingHeaders>true</skipExistingHeaders>
+				</configuration>
+				<executions>
+					<execution>
+						<id>install-format</id>
+						<phase>install</phase>
+						<goals>
+							<goal>format</goal>
+						</goals>
+					</execution>
+				</executions>
+			</plugin>
+		</plugins>
+	</build>
 
-            <plugin>
-                <groupId>org.jacoco</groupId>
-                <artifactId>jacoco-maven-plugin</artifactId>
-                <version>0.7.5.201505241946</version>
-                <executions>
-                    <execution>
-                        <goals>
-                            <goal>prepare-agent</goal>
-                        </goals>
-                    </execution>
-                    <execution>
-                        <id>report</id>
-                        <phase>prepare-package</phase>
-                        <goals>
-                            <goal>report</goal>
-                        </goals>
-                    </execution>
-                </executions>
-            </plugin>
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-surefire-plugin</artifactId>
-                <version>2.18.1</version>
-                <dependencies>
-                    <dependency>
-                        <groupId>org.apache.maven.surefire</groupId>
-                        <artifactId>surefire-junit47</artifactId>
-                        <version>2.18.1</version>
-                    </dependency>
-                </dependencies>
-                <configuration>
-                    <argLine>-Xmx1024M ${argLine}</argLine>
-                </configuration>
-            </plugin>
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-pmd-plugin</artifactId>
-                <version>3.6</version>
-                <configuration>
-                    <failOnViolation>true</failOnViolation>
-                    <failurePriority>5</failurePriority>
-                    <printFailingErrors>true</printFailingErrors>
-                </configuration>
-                <executions>
-                    <execution>
-                        <goals>
-                            <goal>check</goal>
-                        </goals>
-                        <configuration>
-                            <excludeFromFailureFile>exclude-pmd.properties</excludeFromFailureFile>
-                        </configuration>
-                    </execution>
-                </executions>
-            </plugin>
-
-            <plugin>
-                <groupId>com.mycila</groupId>
-                <artifactId>license-maven-plugin</artifactId>
-                <version>2.11</version>
-                <configuration>
-                    <header>com/mycila/maven/plugin/license/templates/MIT.txt</header>
-                    <properties>
-                        <owner>Ilkka Seppälä</owner>
-                    </properties>
-                    <skipExistingHeaders>true</skipExistingHeaders>
-                </configuration>
-                <executions>
-                    <execution>
-                        <id>install-format</id>
-                        <phase>install</phase>
-                        <goals>
-                            <goal>format</goal>
-                        </goals>
-                    </execution>
-                </executions>
-            </plugin>
-        </plugins>
-    </build>
-
-    <reporting>
-        <plugins>
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-pmd-plugin</artifactId>
-                <version>3.6</version>
-            </plugin>
-        </plugins>
-    </reporting>
+  <reporting>
+    <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-pmd-plugin</artifactId>
+        <version>3.6</version>
+      </plugin>
+    </plugins>
+  </reporting>
 
 </project>
diff --git a/private-class-data/pom.xml b/private-class-data/pom.xml
index 877197664..20484245b 100644
--- a/private-class-data/pom.xml
+++ b/private-class-data/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.12.0-SNAPSHOT</version>
+    <version>1.13.0-SNAPSHOT</version>
   </parent>
   <artifactId>private-class-data</artifactId>
   <dependencies>
diff --git a/producer-consumer/pom.xml b/producer-consumer/pom.xml
index c4ea8f1df..a72aa2c96 100644
--- a/producer-consumer/pom.xml
+++ b/producer-consumer/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.12.0-SNAPSHOT</version>
+    <version>1.13.0-SNAPSHOT</version>
   </parent>
   <artifactId>producer-consumer</artifactId>
   <dependencies>
diff --git a/property/pom.xml b/property/pom.xml
index c753261d1..1e9d0f0c2 100644
--- a/property/pom.xml
+++ b/property/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.12.0-SNAPSHOT</version>
+    <version>1.13.0-SNAPSHOT</version>
   </parent>
   <artifactId>property</artifactId>
   <dependencies>
diff --git a/prototype/pom.xml b/prototype/pom.xml
index 7fb43402f..e8bb4303a 100644
--- a/prototype/pom.xml
+++ b/prototype/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.12.0-SNAPSHOT</version>
+    <version>1.13.0-SNAPSHOT</version>
   </parent>
   <artifactId>prototype</artifactId>
   <dependencies>
diff --git a/proxy/pom.xml b/proxy/pom.xml
index 9936be34b..f16736a2c 100644
--- a/proxy/pom.xml
+++ b/proxy/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.12.0-SNAPSHOT</version>
+    <version>1.13.0-SNAPSHOT</version>
   </parent>
   <artifactId>proxy</artifactId>
   <dependencies>
diff --git a/publish-subscribe/pom.xml b/publish-subscribe/pom.xml
index 1ff97ca47..6db6b3538 100644
--- a/publish-subscribe/pom.xml
+++ b/publish-subscribe/pom.xml
@@ -28,7 +28,7 @@
 	<parent>
 		<groupId>com.iluwatar</groupId>
 		<artifactId>java-design-patterns</artifactId>
-		<version>1.12.0-SNAPSHOT</version>
+		<version>1.13.0-SNAPSHOT</version>
 	</parent>
 	<artifactId>publish-subscribe</artifactId>
 	<dependencies>
diff --git a/reactor/pom.xml b/reactor/pom.xml
index 80a15f9d3..c06584c6f 100644
--- a/reactor/pom.xml
+++ b/reactor/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.12.0-SNAPSHOT</version>
+    <version>1.13.0-SNAPSHOT</version>
   </parent>
   <artifactId>reactor</artifactId>
   <dependencies>
diff --git a/reader-writer-lock/pom.xml b/reader-writer-lock/pom.xml
index 0391ea291..2df3d5b14 100644
--- a/reader-writer-lock/pom.xml
+++ b/reader-writer-lock/pom.xml
@@ -30,7 +30,7 @@
     <parent>
         <groupId>com.iluwatar</groupId>
         <artifactId>java-design-patterns</artifactId>
-        <version>1.12.0-SNAPSHOT</version>
+        <version>1.13.0-SNAPSHOT</version>
     </parent>
     <artifactId>reader-writer-lock</artifactId>
     <dependencies>
diff --git a/repository/pom.xml b/repository/pom.xml
index b8b81ee05..56a448ec5 100644
--- a/repository/pom.xml
+++ b/repository/pom.xml
@@ -29,7 +29,7 @@
     <parent>
         <groupId>com.iluwatar</groupId>
         <artifactId>java-design-patterns</artifactId>
-        <version>1.12.0-SNAPSHOT</version>
+        <version>1.13.0-SNAPSHOT</version>
     </parent>
     <artifactId>repository</artifactId>
     <dependencies>
diff --git a/resource-acquisition-is-initialization/pom.xml b/resource-acquisition-is-initialization/pom.xml
index 63971d97c..7b411f46c 100644
--- a/resource-acquisition-is-initialization/pom.xml
+++ b/resource-acquisition-is-initialization/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.12.0-SNAPSHOT</version>
+    <version>1.13.0-SNAPSHOT</version>
   </parent>
   <artifactId>resource-acquisition-is-initialization</artifactId>
   <dependencies>
diff --git a/semaphore/pom.xml b/semaphore/pom.xml
index a2dc143a1..1b3bf8b5d 100644
--- a/semaphore/pom.xml
+++ b/semaphore/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.12.0-SNAPSHOT</version>
+    <version>1.13.0-SNAPSHOT</version>
   </parent>
   <artifactId>semaphore</artifactId>
   <dependencies>
diff --git a/servant/pom.xml b/servant/pom.xml
index a102ad348..c235b005c 100644
--- a/servant/pom.xml
+++ b/servant/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.12.0-SNAPSHOT</version>
+    <version>1.13.0-SNAPSHOT</version>
   </parent>
   <artifactId>servant</artifactId>
   <dependencies>
diff --git a/service-layer/pom.xml b/service-layer/pom.xml
index c5e4eb8d9..23d788595 100644
--- a/service-layer/pom.xml
+++ b/service-layer/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.12.0-SNAPSHOT</version>
+    <version>1.13.0-SNAPSHOT</version>
   </parent>
   <artifactId>service-layer</artifactId>
   <dependencies>
diff --git a/service-locator/pom.xml b/service-locator/pom.xml
index f07dc93f8..0f17b3dcc 100644
--- a/service-locator/pom.xml
+++ b/service-locator/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.12.0-SNAPSHOT</version>
+    <version>1.13.0-SNAPSHOT</version>
   </parent>
   <artifactId>service-locator</artifactId>
   <dependencies>
diff --git a/singleton/pom.xml b/singleton/pom.xml
index 8ab7e0686..ab9405c5e 100644
--- a/singleton/pom.xml
+++ b/singleton/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.12.0-SNAPSHOT</version>
+    <version>1.13.0-SNAPSHOT</version>
   </parent>
   <artifactId>singleton</artifactId>
   <dependencies>
diff --git a/specification/pom.xml b/specification/pom.xml
index c54688919..03c66540d 100644
--- a/specification/pom.xml
+++ b/specification/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.12.0-SNAPSHOT</version>
+    <version>1.13.0-SNAPSHOT</version>
   </parent>
   <artifactId>specification</artifactId>
   <dependencies>
diff --git a/state/pom.xml b/state/pom.xml
index 2411eb2a7..134fbabe1 100644
--- a/state/pom.xml
+++ b/state/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.12.0-SNAPSHOT</version>
+    <version>1.13.0-SNAPSHOT</version>
   </parent>
   <artifactId>state</artifactId>
   <dependencies>
diff --git a/step-builder/pom.xml b/step-builder/pom.xml
index 8d926d118..96098eabc 100644
--- a/step-builder/pom.xml
+++ b/step-builder/pom.xml
@@ -30,7 +30,7 @@
   <parent>
     <artifactId>java-design-patterns</artifactId>
     <groupId>com.iluwatar</groupId>
-    <version>1.12.0-SNAPSHOT</version>
+    <version>1.13.0-SNAPSHOT</version>
   </parent>
   <artifactId>step-builder</artifactId>
   <dependencies>
diff --git a/strategy/pom.xml b/strategy/pom.xml
index 934ff8775..e6fa58081 100644
--- a/strategy/pom.xml
+++ b/strategy/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.12.0-SNAPSHOT</version>
+    <version>1.13.0-SNAPSHOT</version>
   </parent>
   <artifactId>strategy</artifactId>
   <dependencies>
diff --git a/template-method/pom.xml b/template-method/pom.xml
index af0b19cb4..ee533df8f 100644
--- a/template-method/pom.xml
+++ b/template-method/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.12.0-SNAPSHOT</version>
+    <version>1.13.0-SNAPSHOT</version>
   </parent>
   <artifactId>template-method</artifactId>
   <dependencies>
diff --git a/thread-pool/pom.xml b/thread-pool/pom.xml
index 824dcd7af..e7fa43103 100644
--- a/thread-pool/pom.xml
+++ b/thread-pool/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.12.0-SNAPSHOT</version>
+    <version>1.13.0-SNAPSHOT</version>
   </parent>
   <artifactId>thread-pool</artifactId>
   <dependencies>
diff --git a/tolerant-reader/pom.xml b/tolerant-reader/pom.xml
index 249788da0..e5dd3ba88 100644
--- a/tolerant-reader/pom.xml
+++ b/tolerant-reader/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.12.0-SNAPSHOT</version>
+    <version>1.13.0-SNAPSHOT</version>
   </parent>
   <artifactId>tolerant-reader</artifactId>
   <dependencies>
diff --git a/twin/pom.xml b/twin/pom.xml
index 010bf37b2..1eb854b87 100644
--- a/twin/pom.xml
+++ b/twin/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.12.0-SNAPSHOT</version>
+    <version>1.13.0-SNAPSHOT</version>
   </parent>
   <artifactId>twin</artifactId>
   <dependencies>
diff --git a/value-object/pom.xml b/value-object/pom.xml
index 66b2342eb..ec8de1681 100644
--- a/value-object/pom.xml
+++ b/value-object/pom.xml
@@ -30,7 +30,7 @@
 	<parent>
 		<groupId>com.iluwatar</groupId>
 		<artifactId>java-design-patterns</artifactId>
-		<version>1.12.0-SNAPSHOT</version>
+		<version>1.13.0-SNAPSHOT</version>
 	</parent>
 	<artifactId>value-object</artifactId>
 	<dependencies>
diff --git a/visitor/pom.xml b/visitor/pom.xml
index 1b594b179..54a90e184 100644
--- a/visitor/pom.xml
+++ b/visitor/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.12.0-SNAPSHOT</version>
+    <version>1.13.0-SNAPSHOT</version>
   </parent>
   <artifactId>visitor</artifactId>
   <dependencies>