1. A method for runtime environment emulation comprising: loading an application class of an object-oriented application, wherein the object-oriented application is executing in a runtime environment on a computer system prior to the loading, and wherein the application class comprises a method call that is unsupported by the runtime environment; and translating on the computer system, during loading of the application class, the unsupported method call into at least one method call that is supported by the runtime environment, to obtain a translated class, wherein the at least one supported method call emulates the unsupported method call.