Description of problem:
We hit the gwt compile out of memory error in MEAD when building kie-wb-distributions. See the following, I also attached the build.log.

Compiling permutation 5...
DEBUG util.py:257:  [INFO]          Compiling
DEBUG util.py:257:  [INFO]             Compiling permutation 6...
DEBUG util.py:257:  [INFO]       [ERROR] OutOfMemoryError: Increase heap size or lower gwt.jjs.maxThreads
DEBUG util.py:257:  [INFO] java.lang.OutOfMemoryError: GC overhead limit exceeded
DEBUG util.py:257:  [INFO] 	at java.util.HashMap.createEntry(HashMap.java:901)
DEBUG util.py:257:  [INFO] 	at java.util.HashMap.addEntry(HashMap.java:888)
DEBUG util.py:257:  [INFO] 	at java.util.HashMap.put(HashMap.java:509)

Version-Release number of selected component (if applicable):

We usually can specify JAVA_OPTS in build command, however it not working in this case.
I saw the jvmOpts has been hard coded in 
https://github.com/droolsjbpm/kie-wb-distributions/blob/6.0.x/kie-wb/kie-wb-webapp/pom.xml#L960

By adding a patch to increase -Xmx to  -Xmx4096m , the issue disappear.

Should we increase that in the source kie-wb-distributions/kie-wb/kie-wb-webapp/pom.xml?


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