In theory, all J2SE JVMs are bytecode compatible. For example, a class compiled with one vendor's compiler tools should behave identically on another vendors JVM. However, classes compiled with a J2SE compiler will not necessarily work on a CLDC JVM. The reason for this is that CLDC is necessarily less sophisticated than a full-scale JVM, and cannot do the iterative bytecode verification that a proper JVM has to do. As a result, CLDC developers typically compile Java using an ordinary Java compiler, then convert the standard bytecode it into CLDC-compatible bytecode using one of the various tools that are available.

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