Proper way to configure IntelliJ to use source code for decompiled jar

Question

I have been trying to figure this one out for a bit, not coming up with the right approach. I read through this question , which I'd already tried, but it's not working quite right.. using IntelliJ EAP 142.4675.3

What I am trying to do, is to debug a junit test using a jar (extending the Provider class) file I've placed into JAVA_HOME\\jre\\lib\\ext. I want that jar to be debuggable as well.

The problem is, if I attach my source directory as the source for a jar, then, in a stack trace, when I click the named file (containing a method I wish to view), IntelliJ asks me to choose between two of the same file, presumably because it knows about the source (it's in a module in my project) and it's also been told about the source via the jar source path I added.

I tried adding the provider.jar to the project module dependencies tab, which caused intellij no end of grief. Reverted back to having it in jre\\lib\\ext, and, in the Platform Settings->SDKs->1.8->Sourcepath tab, I added the module sourcepath. This lets intellij step into the .java file for the jar, vs the .class file, but, when it does so, I now get a banner at the top of my code windows which says "Alternative source available for the class xxx" and there's a combobox at the RHS with the module name listed twice (in the latest EAP, it actually lists the module and the jar [same name as module, with .jar]). And, as mentioned earlier, the IDE asks which which (of the very same) file I wish to edit when I click a file in the stack trace.

Clearly, there is something not quite right.. what am I missing? I find it odd that the ide will not open the source code when stepping into the jar until I attach the code as above, but, when I do, it sees it twice.

Answer 1

So let's start from scratch:

• File > New Project, choose "Java Module", fill the form:
• Bypass the form asking about the kind of project (webapp etc) by clicking on "finish"
• you now have a project with a src dir:
• right click the 32910506 directory and choose "New" then "Directory" and create a new directory named lib.
• drag and drop your 2 jars (sources and code) to this directory (I will use common-lang for this example), beware to copy, not move:
• now right click on src , choose "New", "Java class", name it App :
• right click your "code jar" and choose "Add as library":
• in App type psvm then hit TAB to get a main and fill it like this:
• right click on your "code jar" and choose "Open library settings":
• click "+" and choose "Attach file or directory" and select your "sources jar":
• Now if your Ctrl +click on random in App, you should end up to the method source:
• Put a break point in the random method:

• Now right click App , choose "Debug App.main()", you should end up to the previous breakpoint:

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Used: idea 12.1.6 under linux