Pass: Monad Interface string (json) If you must pass objects. For web services built in types are always better for parameter passing. I have web services that our called by C, VBA, Cobol, Fortran.

One option is to pass class objects as parameters and the other is to use the Java Reflection API. Reflection allows some degree of inspection and manipulation of generic types.

Is it poor programming practice to pass parameters as objects? Are you making code more maintainable? Or just covering up poorly defined methods?