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With the OpenOffice.org plugin for NetBeans, there are interface definition files for the communication with OpenOffice.org. These are compiled directly to .class files in the build/classes directory. This directory ("Compiled Sources") is added to the list of "Compile Libraries". But when the idl classes are used in Java, they are marked as "cannot find symbol" in the Editor. Compiling works nonetheless. Do files that are used from build/classes have to exist as .java files?
Well, build/classes is (mostly) ignored, as it is supposed that the classfile inside are generated from the corresponding Java sources (which are the authoritative source of information for the editor). The classfiles would not be ignored if they would be part of a classpath entry which does not have any sources attached. Please see also issue #116208 for possible workarounds. Sorry, but I do not think this is fixable.
OK. I will work around this.