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dev 050107 custom, JDK 1.6. I think this has MCPI.java rev. 1.18, i.e. NPE from roots.add(obj); Note that roots was set to a non-null value earlier in the method, and the only place where this field is assigned outside of a synchronized block is in the property change listener at the top of the class, so that may be the culprit.
Created attachment 19586 [details] Stack trace
*** Issue 53325 has been marked as a duplicate of this issue. ***
Fixed. Checking in src/org/netbeans/modules/javacore/classpath/MergedClassPathImplementation.java; /cvs/java/javacore/src/org/netbeans/modules/javacore/classpath/MergedClassPathImplementation.java,v <-- MergedClassPathImplementation.java new revision: 1.19; previous revision: 1.18 done
*** Issue 53214 has been marked as a duplicate of this issue. ***
*** Issue 53217 has been marked as a duplicate of this issue. ***
*** Issue 53282 has been marked as a duplicate of this issue. ***
*** Issue 53300 has been marked as a duplicate of this issue. ***
Reorganization of java component