Step through JDK source code in IntelliJ IDEA

Question

How can I step through JDK source code in IntelliJ IDEA 7 and see the debug info? I can currently hit breakpoints and step through the code, but the debug info is not avail

Answer 1

UPDATE: IntelliJ IDEA 13+ version can provide local variables information without debug info.

Java classes which are part of the JDK are compiled without debug info for the size and performance reasons. If you want debug info in these classes, you'll either need to install a development version of the JDK where the classes are built with the debug info or rebuild the parts of JDK you want to debug from source with the debug info enabled and configure the new JDK with these versions of classes in jars.

This thread provides the instructions how to rebuild JDK classes in rt.jar from the source code with debugging information.

P.S. This question is not specific to IntelliJ IDEA.