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fresh build, 1.6.0-beta-b59c, linux I just select five classes in "Projects" view and press Alt+Shift-p. Attached exception is thrown. Next time it works -> RANDOM. Maybe not an error in the plugin - up to you.
Created attachment 28278 [details] 71141-AE.txt
I tried to fix this though I was not able to reproduce and verify this.
I'll check it as soon as a new version is out.
pmd/pmd-netbeans/src/pmd/RunPMDAction.java 1.41