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How to navigate to source code of system library class in Eclipse

In Eclipse you want to navigate to the source code of standard class String, and you get the following message: Source not found

Solution

1. Install JDK in your laptop, and then configure it into Windows->Preferences->Java->Installed JRE. Delete existing entry for JRE:

And click Add… button:
Add JDK instead:

Once added, set JDK as default entry:

2. Preferences->Java Build Path, remove existing entry of JRE:
Click Add Library button:
Choose JDK instead:

Once done, you can now navigate to the source code of standard class like String now.
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