Eclipse is very slow when using Code Assist (org.eclipse.mylyn.java.ui.javaAllCompletionProposalComputer)

Can you guess what happens?

I generated a client stub using Eclipse WTP [Axis2] and while working on a client I get Eclipse working very slowly when it tries to use Code Assist, that is, press a dot to get a list of methods, there's up to 30 seconds hang-ups of the workbench.

eclipse.buildId=M20090917-0800 java.version=1.6.0_15 java.vendor=Sun Microsystems Inc. BootLoader constants: OS=win32, ARCH=x86, WS=win32, NL=ru_RU Framework arguments: -product org.eclipse.epp.package.jee.product Command-line arguments: -os win32 -ws win32 -arch x86 -product org.eclipse.epp.pac开发者_运维百科kage.jee.product

Warning Fri Jan 22 16:40:51 MSK 2010 The 'org.eclipse.mylyn.java.ui.javaAllCompletionProposalComputer' proposal computer from the 'org.eclipse.mylyn.java.ui' plug-in did not complete normally. The extension took too long to return from the 'computeCompletionProposals()' operation.

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I was mucking with eclipse.ini and doubled the XXMaxPermSize to 512M. According to Sun:

MaxPermSize specifies the the maximum size for the permanent generation heap, a heap that holds objects such as classes and methods.

Like magic, the hang is gone. I would not be surprised if Eclipse uses the permanent generation heap to store/sort candidates for Content Assist and thrashes if the heap gets overloaded.

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I had the same problem. Increased heap, changed VM, nothing worked. Until I found that one of my dependencies was a library shared via network drive. I copied the JAR locally and changed the dependency. My hang time went away.

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I have the same problem. This is due to an error in workspace. My solution is get rid of error workspace, switch to another workspace folder and import my projects again.

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Well for those interested: the only solution I found is get back to the Ganymede (The most recent version today is Galileo 3.5.1).

I tried Galileo Classic and Galileo 3.5.1 Java EE, both freshly downloaded, neither worked with that project. Eclipse hangs up and uses 100% of CPU resource.

Ganymede works fine.

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If Mylyn is not used another solution could be to disable the automatic activation of the Mylyn plug-ins on startup: Window -> Preferences -> General -> Startup and Shutdown

This did it for me.