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I had an issue which seems to be almost like #75032. I was using 5.5 Beta 2. Suddenly I could not get any completions for core java classes such as java.lang, java.util etc. And when I tried auto-imports I was suggested some weird classes for String and java.lang.String was not in the list. I deleted the mdrcache in the IDE install directory and restarted the ide, allowed it to parse all the classes and everything seems to work fine. I am going to continue using the system for a while to see if it happens again. Unfortunately I did save the log files (stupid me). Will try and simulate the issue when I have a little time, ( I assume I will have to reinstall 5.5 Beta2 to simulate it).
What version of JDK do you use?
Javacore module was replaced by Retouche infrastructure. This bug is not valid in trunk any more.
Reorganization of java component