Sap GUI for java on linux - memory leak

I have a big problem running SAP GUI for java on linux - actually running the GUI for about an hour of work consumes all memory and swap - and the only way to get it back is to restart X server. The memory is allocated not by the GUI itself - but by the X server and is not freed when I quit GUI. I an running latest X.org 6.8.2 and sun jdk 1.4.2 - may be there is some known incompatibility with those versions or some config options to prevent this issue?