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How can I download the source code of Java on my local machine, so I can reference it in an IDE?

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Example for Java 8: 

sudo apt-get install openjdk-8-source

apt-get puts it under the relevant JDK location as src.zip: /usr/lib/jvm/java-8-openjdk-amd64/src.zip

Intellij IDEA recognized it automatically and started showing me the source code.

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In case of java 11 (on Ubuntu 18.04) I did:

First I install jdk 11:

sudo apt install openjdk-11-jdk

I install the sources like this:

sudo apt-get install openjdk-11-source

And I found them in /usr/lib/jvm/openjdk-11/lib/src.zip

I use Eclipse so I go inside Eclipse's menu Window -> Preferences -> Installed JREs and inside select java-11-openjdk-amd64 -> edit -> select the jar (jrt-fs.jar) -> Source Attachment -> External location -> /usr/lib/jvm/openjdk-11/lib/src.zip

Now I happily read the java documentation! :)

Best of luck to all!

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  • Where is the jrt-fs.jar? Is it inside the .zip?
    – birgersp
    Mar 4, 2020 at 18:51
  • No jrt-fs.jar should be in the lib directory of your JDK. For example /usr/lib/jvm/java-11-openjdk-amd64/lib/jrt-fs.jar Please check if you have it after you install sudo apt install openjdk-11-jdk In Eclipse menu you can see it after you press edit button on the selected JDK and you can see it in JRE system libraries section.
    – Level_Up
    Mar 5, 2020 at 9:00
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In case of java 13 simply run sudo apt-get install openjdk-13-source

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