The‘org.eclipse.jdt.ui.JavaAllCompletionProposalComputer‘ Proposal
computer from the ‘ org.eclipse.jdt.ui‘ plug-in did not complete normally.
‘ computeCompletionProposals()‘ operation.
To avoid this message, disable the ‘ org.eclipse.jdt.ui‘ plug-in or disable the
‘Java Proposals‘ category ont the content assist preference page.
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原文：http://blog.csdn.net/michael10001/article/details/30139897