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There is possibly only add jar to the classpath when is created project from antscript. To use library from library manager is better because you can set javadoc documentation to the library. The javadoc is very usefull in java completion in editor.
Wrong component.
As designed. The original build script itself does not operate on IDE libraries, it operated on JARs; the freeform configuration is just a description of that script. You can get code completion etc. working fine so long as there is some association between the actual JAR in the classpath and some Javadoc; one way of doing this is to create a library with that JAR and the desired Javadoc. (Same for sources.)
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*** This issue has been marked as a duplicate of 47498 ***