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During the building of the whole NBI (engine + components) by running "all" target of the root build.xml the engine should be build only once. This would significantly reduce the build time. The current build procedure should be investigated. The other point is to avoid using overriding targets ("Trying to override old definition of task blah-blah-blah") in the build.
This can be easily done by unselecting "Build projects on Classpath" checkbox in components projects. This has some drawbacks, but generally is a good thing to do.
Fixed. Unchecked the "Build projects on Classpath" checkbox for all components. Also made some changes to the top-level build.xml, to fix build failures after this change.
Refixed. Checked back the "Build projects on Classpath" checkbox for all components. Made the top-level build.xml file pass an additional property to components' build scripts, so that they do not rebuild the engine while running "all" target.