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I tried to refactor a class used in from http://hg.netbeans.org/core-main/file/team_support/c2c.tasks/src/org/netbeans/modules/c2c/tasks/DummyUtils.java and wrap around the *lien*ata class with local extension. But it seems like the refactoring double wrapped the usage, so: X x = DummyUtils.getClientData(); /* let suppose getClientData returns X */ become X x = new my.pkg.X(DummyUtils.getClientData()); which is wrong as DummyUtil.getClientData() also changed its type to my.pkg.X after the refactoring.
Report from old NetBeans version. Due to code changes since it was reported likely not reproducible now. Feel free to reopen if happens in 8.0.2 or 8.1.