A method for runtime environment emulation involves loading an application class of an object-oriented application, where the object-oriented application is executing in a runtime environment, and where the application class includes a method call that is unsupported by the runtime environment. The method further involves translating, during loading of the application class, the unsupported method call into one or more method calls that are supported by the runtime environment, to obtain a translated class, where the one or more supported method calls emulate the unsupported method call.