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[dev-200503161050, JDK 1.5.0_02] If user put some library under project folder and creates IDE library (using Library Manager) from those binaries, *including javadoc and sources* then only classpath property is written to project.properties file. build.properties file contains also source path and javadoc path and those should be written to project.properties as well (relatively, of course). It allows better shareability of the project.
*** This issue has been marked as a duplicate of 44035 ***
Verified dupe.