Good disassembler?

[John Keiser]

        I need a good Java disassembler.  Either guavac is generating bad bytecode
or Japhar is interpreting it wrong, and I wish to know where to look.
        Said disassembler must work on a *classfile,* not an already-loaded class.
This is because the offending class is java.lang.System. :)
--John Keiser