ARM requires precise exceptions, which meant translation of bytecode was on instruction by instruction basis in the fetch/decode stage ... which is not good f

ARM requires precise exceptions, which meant translation of bytecode was on instruction by instruction basis in the fetch/decode stage ... which is not good for performance. Moreover, Jazelle could only do simple bytecode in hardware, the complex instructions were done in software, which lead to massive exception-emulate-return overhead. Also, Jazelle was Java only, so no support for other byte codes, which limited Jazelle's potential. Within a few years, everybody had a 'null implementation'