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In daily builds there is wrong etc/netbeans.conf. It contains -J-Xms128m but the correct one in Hg repository uses -J-Xms32m. It was previously fixed in nbbuild/build.xml (see b035d7b29609), so I don't know why it doesn't work.
It seems to me that the tests are modifying it during their run, because it started to occur after I added them to the build. So I'd say that this P1 belong to xtest because it is updating files which it shouldn't touch.
I am not aware of changing netbeans.conf in XTest. Could you tell which scripts do you run to build and zip daily build? And which tests?
It turned out netbeans.conf is modified by some tests. The solution is to copy nbbuild/netbeans to some temporary place and run tests against this copy: rm -rf /tmp/netbeans cp -r nbbuild/netbeans /tmp ant -f xtest/instance/build.xml ... -Dnetbeans.dest.dir=/tmp/netbeans runtests
*** This issue has been marked as a duplicate of 128822 ***
Verified.