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Please let me know how to Enable this two buttons in Eclipse oxygen. Thanks in advance. I think I have disabled it mistakenly.

Bhavani
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Since Java 9 (supported since Oxygen.1a) a project has a Modulepath and a Classpath. The buttons are deactivated until one of the two paths to which the JAR should be added is selected.

howlger
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    More details on the difference between both: https://stackoverflow.com/questions/50321602/in-eclipse-what-is-the-difference-between-modulepath-and-classpath/50324391 – Romano Aug 23 '18 at 15:04