java applet fail when launched with server “incompatible magic value 1013478509”

Question

I\'m having a problem with my applet. I have a school project where I\'m supposed to make a pong-online game. It runs fine offline but when I try to load it from a server I just

Answer 1

This means you have a file with the .class extension which is not a class. All classes have to start with magic number of 0xCAFEBABE

The first four bytes of your "class" reads

System.out.println(new String(BigInteger.valueOf(1013478509).toByteArray()));

prints

so I suspect it's a HTML file.