I'm new to java and facing this problem while debugging code

I found rt.jar when used external file but didn't work , Is that mean the file is corrupt or what ?
I'm new to java and facing this problem while debugging code

I found rt.jar when used external file but didn't work , Is that mean the file is corrupt or what ?
You need to attach src.zip as the source (probably in /usr/lib/jvm/java-6-openjdk-amd64). If you don't have src.zip, make sure the openjdk-6-source package is installed.