move to Java 6 for unit tests

releng.wtpbuilder/distribution/wtp.tests/testScripts/wtp-junit-tests.xml

@@ -74,7 +74,7 @@
             value="${junit-report-output}/raw/${classname}.xml"/>
         <property
             name="jvm"
-            value="${env.JAVA_5_HOME}/bin/java"/>
+            value="${env.JAVA_6_HOME}/bin/java"/>
         <dirname
             file="${ant.file}"
             property="currentDir"/>