diff --git a/core/pom.xml b/core/pom.xml
index 70307a9fac7b32435f7273100a7a5c28ffafa499..f88bf8db2a32cba92e84501371a499613881e925 100644
--- a/core/pom.xml
+++ b/core/pom.xml
@@ -13,6 +13,24 @@
   
   <build>
     <plugins>
+      <plugin>
+        <artifactId>maven-enforcer-plugin</artifactId>
+        <executions>
+          <execution>
+            <goals>
+              <goal>enforce-once</goal>
+            </goals>
+            <configuration>
+              <rules>
+                <!-- There is a bug in JDK 1.5's compiler therefore need to compile with 1.6 -->
+                <requireJavaVersion>
+                  <version>[1.6.0,]</version>
+                </requireJavaVersion>
+              </rules>
+            </configuration>
+          </execution>
+        </executions>
+      </plugin>
       <plugin>
         <groupId>org.kohsuke.stapler</groupId>
         <artifactId>maven-stapler-plugin</artifactId>
diff --git a/pom.xml b/pom.xml
index 03bbfb7dd7c9bf952dbf8d70c6205ee5b4f7c3c9..d9b7e2678ed6d05889394c509e4cc3fd708b61db 100644
--- a/pom.xml
+++ b/pom.xml
@@ -32,25 +32,6 @@
   
   <build>
     <plugins>
-      <plugin>
-        <groupId>org.apache.maven.plugins</groupId>
-        <artifactId>maven-enforcer-plugin</artifactId>
-        <executions>
-          <execution>
-            <goals>
-              <goal>enforce-once</goal>
-            </goals>
-            <configuration>
-              <rules>
-                <!-- There is a bug in JDK 1.5's compiler therefore need to compile with 1.6 -->
-                <requireJavaVersion>
-                  <version>[1.6.0,]</version>
-                </requireJavaVersion>
-              </rules>
-            </configuration>
-          </execution>
-        </executions>
-      </plugin>
       <plugin>
         <artifactId>maven-release-plugin</artifactId>
         <configuration>