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Steps to reproduce - check out core module from NB CVS - switch to Files tab, open the file core/launcher/unix/nbexec - make some edits in this file - right click on the file in explorer, CVS -> Diff. Got quite a few exception dialogs with "null" as a message I will attach the log file
Created attachment 26229 [details] var/log/messages.log
An idea: nbexec is not shown in project logical view. This make makes a difference
yet another reproducible test case: I have this file modifed locally core/swing/tabcontrol/src/org/netbeans/swing/tabcontrol/plaf/AquaSlidingButtonUI.java Trying to diff it against CVS ends in repeatable NPEs Both core and core/swing/tabcontrol are projects. I had the latter open in the GUI I bumped the priority to P1. This bug blocks the normal IDE workflow.
I was able to reproduce it if I ran IDE from my local CVS workdir. /shared/data/ccvs/repository/javacvs/cvsmodule/src/org/netbeans/modules/versioning/system/cvss/ClientRuntime.java,v <-- ClientRuntime.java new revision: 1.25; previous revision: 1.24
*** Issue 66497 has been marked as a duplicate of this issue. ***