Description Jörg von Frantzius 2013-02-18 03:25:19 EST

Created attachment 227180 [details]
Full thread dump

My installation of Eclipse 4.2.1 with "      Eclipse Java Development Tools	3.8.1.v20120814-104540-8-8nFqpFNOfwKDRVz-tXOcL5d_83	org.eclipse.jdt.feature.group	Eclipse.org" just locked up when I pressed Ctrl+O for opening an outline within the Java editor.

The thread dump I took shows several threads like this:

"Text Viewer Hover Presenter" daemon prio=10 tid=0x00007f0d19fc8800 nid=0x5b8e in Object.wait() [0x00007f0e3f5fb000]
   java.lang.Thread.State: WAITING (on object monitor)
        at java.lang.Object.wait(Native Method)
        - waiting on <0x00000000a28a3d40> (a java.lang.Object)
        at java.lang.Object.wait(Object.java:503)
        at org.eclipse.jdt.internal.ui.javaeditor.ASTProvider.getAST(ASTProvider.java:457)
        - locked <0x00000000a28a3d40> (a java.lang.Object)
        at org.eclipse.jdt.ui.SharedASTProvider.getAST(SharedASTProvider.java:128)

with different entries into that method. It seems that Object.wait() is called, but nothing happens to wake up the thread.

I haven't had this repeatedly yet, only one occasion so far. Still seems to prove that something is likely wrong in synchronization code (and may ask for standard multithreading library calls :)