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Sorry, I have no idea how your IDE works.

I suppose some of the IDEs are useful. I build mine with a batch file and trial and error.
I have a utility that checks that the contents of the jar file is complete (ie no missing classes) and has...

Go back to the .java file and try to compile it to create a good .class file. Then build the jar file being sure to use the good .class file.

Sorry about your IDE being confusing. It is for lots...

If that is from the .class file, then it definitely is not a .class from the javac compiler.
It looks like a text file. Open a text editor and the open the file. Or rename it by adding .txt and...

I think you get that for an invalid class file. Look at the edu/cmu/sphinx/demo/RobotTest/RobotTest.class file with a hex editor and see what the first few bytes of the flle looks like. It should be...

First you need to find the class mentioned in the error message.
Then you need to put in on the classpath so the java command can find it.
Can you explain what you have done, where all the files...