I've just installer the ASM Eclipse Plugin (and restarted), which give an improved Bytecode Outline, and I can use it for the JRE classes, but looking at my own code, I get the error message in the title.

My java project is on Build Automatically, and I my source files do not have errors, and I can see the class files in the Default output folder defined in the Java Build Path of the Project's properties.

solutions:

Is it showing such a problem? "Error (Bytecode Outline) src/Foo.java [in BarProject] is not on its project's build path. " That's a version problem. Use http://andrei.gmxhome.de/eclipse/ as the update URL with the update manager and install the new version.