Eclipse: in the Libraries tab all buttons are disabled
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Solution 1
You first have to select either Modulepath or Classpath.
The Modulepath is a very new thing for Java 9 (here you can watch a short video how it can be used). It exists since the Eclipse Oxygen.1a (4.7.1a), October 11, 2017. In case of doubt, I recommend selecting Classpath.
Solution 2
When this window is open first click on the 'Modulepath' > After that 'Add JARs' option get enabled.
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