View Java documentation for annotations inside VS Code, error: "Failed to get sources. Instead stub sources have been generated by the disassembler"

Question

I am using the Spring tool suite for VS Code. It's working great, but there is one thing I am missing: in other IDEs you can view the documentation for a specific annotation or method.

For example:

If I try to view the documentation for any annotation in IntelliJ, it shows the documentation properly, but if I try to do the same in VS Code it shows up like this:

 // Failed to get sources. Instead, stub sources have been generated by the disassembler.
 // Implementation of methods is unavailable.
package org.springframework.beans.factory.annotation;
public abstract @interface Autowired {

  public abstract boolean required() default true;
}

Answer 1

You can enable the setting java.maven.downloadSources.

Then each time you opened a class file, if the source jar does not exist locally, the extension will trigger a download task for that source jar. After that, next time you open that class file, you can see the source.