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I want to see source for particular class. For example, now I work with JUnit and in code have this line:

Result result = JUnitCore.runClasses(MyClassTest.class);

I want to see how is implemented Result class. Is it possible?

I imported JUnit jar into build path. I am using Eclipse 3.6 Helios.

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You need to attach source of the corresponding library.

Download Junit's source zip ( from their release site, corresponding to the JUNIT you are using) - example link

Then follow these steps in IBM's link on the topic - with steps

Once you do that, Ctrl + click on the class you interested in - while you are in the editor, you will see its source.

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I downloaded source but, when I do like on IBM's link and select node Source Attachment, can't click on Edit button because it's grayed. Beside node it's written: "Source Attachment: (None) - non modifiable."
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Multiple ways:

  • download the sources and add them to the project build path
  • use maven and set it to download sources
  • use a decompiler - for example JD-Eclipse
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I don't know maven. I installed JD-Eclipse and it work. When I do right click on class Result, end select Open Declaration it gives me source. Thanks.
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right click the class you want to see its implementation in eclipse, and click "Open Declaration F3"

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It gives me: "Source not found", and some text below.

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