Created attachment 141778 [details]
threaddump

Netbeans 7.4 often fails to open documents such as Java class in the Editor of a Maven multi-module project.

For instance, if I do a "Go to type" and specify a type, Netbeans seems to freeze then display a popup dialog saying "Calculation declaration position" and stays like that indefinitely. The UI is not blocks as I can close the dialog but I can never open a document.

If I click on a Java Class the "Projects" navigator, it displays a blank document such as the joint screenshot. I took a theaddump.

JVM: Java HotSpot(TM) 64-Bit Server VM (24.45-b08, mixed mode)
Java: version 1.7.0_45, vendor Oracle Corporation
JVM arguments :
Dnetbeans.importclass=org.netbeans.upgrade.AutoUpgrade
-Dnetbeans.accept_license_class=org.netbeans.license.AcceptLicense
-client
-Xss512k
-Xms128m
-Xmx768m
-XX:PermSize=32m
-XX:MaxPermSize=256m
-Dapple.laf.useScreenMenuBar=true
-Dapple.awt.graphics.UseQuartz=true
-Dsun.java2d.dpiaware=true
-Dsun.zip.disableMemoryMapping=true
-Djdk.home=D:\projects\jdk\64\1.7.0
-Dnetbeans.home=E:\projects\netbeans\7.4\platform
-Dnetbeans.user=C:\Users\moghrabi\AppData\Roaming\NetBeans\7.4
-Dnetbeans.default_userdir_root=C:\Users\moghrabi\AppData\Roaming\NetBeans
-XX:+HeapDumpOnOutOfMemoryError
-XX:HeapDumpPath=C:\Users\moghrabi\AppData\Roaming\NetBeans\7.4\var\log\heapdump.hprof
-Dsun.awt.keepWorkingSetOnMinimize=true
-Dnetbeans.dirs=E:\projects\netbeans\7.4\nb;E:\projects\netbeans\7.4\ergonomics;E:\projects\netbeans\7.4\ide;E:\projects\netbeans\7.4\extide;E:\projects\netbeans\7.4\java;E:\projects\netbeans\7.4\apisupport;E:\projects\netbeans\7.4\webcommon;E:\projects\netbeans\7.4\websvccommon;E:\projects\netbeans\7.4\enterprise;E:\projects\netbeans\7.4\mobility;E:\projects\netbeans\7.4\profiler;E:\projects\netbeans\7.4\python;E:\projects\netbeans\7.4\php;E:\projects\netbeans\7.4\identity;E:\projects\netbeans\7.4\harness;E:\projects\netbeans\7.4\cnd;E:\projects\netbeans\7.4\dlight;E:\projects\netbeans\7.4\groovy;E:\projects\netbeans\7.4\extra;E:\projects\netbeans\7.4\javacard;E:\projects\netbeans\7.4\javafx exit