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I use JAI (Java Advanced Imaging). Inspite of the library beeing in my classpath (and showing up as one of the jdk libraries), the import statements for it do not work. javax.media.JAI does not exist. On linux it works. I do not know what the reason for this is. On another editor this does work. I havent tried this with another version of netbeans as i currently dont have one.
If your problem still persists, try to delete folder .netbeans/dev/var/cache under your userdir installation (should be in your home dir, if you haven't change it). It will recreate MDR storage and it might help. If it doesn't help please provide steps to reproduce and if possible attach or send the problematic project. Thanks.
Sure, there is no class javax.media.JAI. There is a class javax.media.jai.JAI and there is a package javax.media.jai. Both can be imported. javax.media.JAI is not class nor package from Java Advanced Imaging library.