While the bug in javac for JDK 1.5 exists, force people to use JDK 1.6 to compile hudson/main.

Let hudson/plugins still compile with JDK 1.5 (To allow checking that only JDK 1.5 methods have been used)
The root pom should display the current build environment (Maven version, JDK, OS etc) to help debug issues with the build.
use
MAVEN_OPTS=-Denforcer.skip=true
to turn off the enforcer rules
(See http://www.nabble.com/trunk-not-compiling-tf4540224.html)


git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@5048 71c3de6d-444a-0410-be80-ed276b4c234a

pom.xml

@@ -32,6 +32,25 @@
   
   <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>
@@ -59,7 +78,7 @@
   <properties>
     <maven.version>2.0.4</maven.version>
   </properties>
-  
+
   <profiles>
     <profile>
       <id>debug</id>