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For example LineBreakpointImpl stores BreakpointsReader and Breakpoint in its field as well as its super(.super) class BreakpointImpl. And for example breakpoint is accessible through protected method so it not neceseary to keep another copy of this reference again (might be even easier to use if sources get generified).
Right, it's not necessary.
Easy to fix, it's fixed in trunk: /cvs/debuggerjpda/src/org/netbeans/modules/debugger/jpda/breakpoints/LineBreakpointImpl.java,v <-- LineBreakpointImpl.java new revision: 1.33; previous revision: 1.32
Verified ... and Closing all issues resolved into NetBeans 6.7 and earlier.