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


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.