Fix issues introduced by latest Java additions

[fyrz]

• Makefile did not cleanup after test
• Crossbuild sets explicit JDK6 which is wrong because Java7 dependencies were introduced lately.

[fyrz]

@yhchiang can you please look at this.

[adamretter]

I see that the Travis-CI build is failing because of the test suite. This seems to be an intermittent problem, sometimes (but not always) when I run the test suite locally it also fails. I don't know if this is a test suite problem or an underlying Rocks issue. However I would suggest this should be fixed as a priority, if we can't rely on the test suite, well that is a a big problem.

[igorcanadi]

@adamretter We will fix it ASAP

[igorcanadi]

Fixed -- 90f1564

[igorcanadi]

@adamretter @fyrz can you guys add java test to travis build?

[adamretter]

@igorcanadi Thanks for the fix, I have sent a pull-request for Travis.

[fyrz]

@igorcanadi can you merge this one also it solves some issues with the last additions.

[igorcanadi]

@adamretter can you please review @fyrz's patch? :)

[yhchiang]

@fyrz: thanks for the patch. The diff looks good to me.
Not sure what goes wrong in Travis, but I can successfully build it on my machine.