Check the box for under the "Automatically download" section.
If the automatic setting is off, or you only need sources for one specific library, use the editor's built-in prompts: intellij download jar source
Go to > Settings (or IntelliJ IDEA > Settings on macOS). Check the box for under the "Automatically download" section
Alternatively, you can add downloadSources = true within the idea plugin block in your build.gradle file. 2. Manual Download for Specific Libraries intellij download jar source
To view the actual source code of a JAR file instead of decompiled bytecode in IntelliJ IDEA, you must attach a separate "sources" JAR. You can do this automatically via build tools like Maven and Gradle or manually for local libraries. 1. Automatic Download (Maven & Gradle)
Most modern Java projects use build systems that can fetch source code from central repositories automatically. :
intellij idea - Automatically download sources in Gradle project