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I use the jar command. I write a batch file that contains the jar command for any project that needs to be in a jar file.

You should use a jar file to hold the class file and the image file. I don't know how to you can tell the IDE to put all the files you need in the jar file.
If all the files are in the jar file,...

What do you mean by "export"? That sounds like a problem with the IDE.
I use a simple editor with a command line where I can issue the javac command. I copy the html to the same folder as the...

I copied the code that was posted and it works for me outside of a jar file.
I don't use your IDE and can't help you with it.
Look at the section of the forum for your IDE and see if there are...

Can you put the image in the jar file? That will be better.
Can you post the code and html you are using on the forum?

NOTE: There is a compiler error in the posted code and an error in the...

Strange there is no error message in the contents of the java console that you posted. Are you sure you copied all of its contents?

Is the class file in the jar file in the mainpackage folder? ...