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After recent changes the project is not rebuilt between runs if it is detected to be unchanged. However, if Run configuration is changed to some other this may lead to failures. E.g., if two different configurations define two different preloaders, then changing one to another should lead to rebuild before next run in order to refresh dist/lib contents and definitions inside jnlp file. The workaround in case of this failure is nevertheless simple - manual rebuild resolves the problem and makes the project runnable again.
fixed in jetmain http://hg.netbeans.org/jet-main/rev/06c1ee0d3ebf
Integrated into 'main-golden', will be available in build *201210120002* on http://bits.netbeans.org/dev/nightly/ (upload may still be in progress) Changeset: http://hg.netbeans.org/main-golden/rev/06c1ee0d3ebf User: Petr Somol <psomol@netbeans.org> Log: #219519 - Change of Run configuration does not cause rebuild before next run