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The files that are the children of a 'derived' folder are excluded from the build and threated as read-only. The 'derived' flag is usually set by the maven import in order to indicate that the resource (some target folder contents) can be removed upon a build operation, so it shouldn't be treated as a source. See: Bug #466260
Created attachment 257391 [details] Patch to fix the issue JSDT Web Core part of the fix: The files that are the children of a 'derived' folder are excluded from the build and threated as read-only. The 'derived' flag is usually set by the maven import in order to indicate that the resource (some target folder contents) can be removed upon a build operation, so it shouldn't be treated as a source.