Could be a duplicate of https://bugs.launchpad.net/debian/+source/openjdk-7/+bug/1512760 title: Java applications leaks shmem chunks
See also https://askubuntu.com/questions/697515/graphical-issue-with-kubuntu (12.04.01 / fully-udated) – bit lenghty because of analysing and Kub 12.04 can't just install OpenJDK-8
Could be a duplicate of https:/ /bugs.launchpad .net/debian/ +source/ openjdk- 7/+bug/ 1512760 title: Java applications leaks shmem chunks
See also https:/ /askubuntu. com/questions/ 697515/ graphical- issue-with- kubuntu (12.04.01 / fully-udated) – bit lenghty because of analysing and Kub 12.04 can't just install OpenJDK-8