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I have the same problem with the issue No.129341 I can't create new JavaClass and new Project as well.
Created attachment 59960 [details] after hit the "finish" button, every thing is halting
Seems to be like a random case but please try to catch thread dump when this happens and enclose it to this issue. also jdk version is need to know.
no response for a long time, closing as invalid for now. If it's still reproducible feel free to reopen and provide requested info. Thanks