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The new editor annotates my source-code with many errors which are simply not true. For example, the first error it highlights is "javax.persistence does not exist" yet I included a JAR file in the project classpath which defines this package and associated classes. Furthermore, if I hit F9 to compile the file it compiles just fine. I've only seen this problem since the introduction of the new editor. Is there information I can provide you with to help you reproduce this problem on your end?
Yes, can you provide more info about project you've used, please? Projet type, config file (project.xml, project.properties in nbproject directory). Did you add jar as single jar or as library (if the second case: how is the library defined)? This looks very similar to issue 90360, but I'm not sure yet if it's duplicate.
Ugh. I've been seeing this issue for *weeks* and today when I open Netbeans to double-check the problem is magically gone. I upgraded to Java6 final recently so *maybe* that magically fixed things but I really don't see why. I was using b103 before and Java6 final is b105. Anyway, I'm closing this issue for now until I can reproduce it again.