SIMULATING A MULTI-TIERED COMPUTER ENVIRONMENT ON A SINGLE DEVELOPMENT SYSTEM FOR DEBUGGING

A method, apparatus, and article of manufacture for simulating a multi-tiered environment on a single computer. An application file is generated comprising second tier instructions invoking first tier instructions and third tier instructions. The application file is provided to the second and third tier runtime engines. The second tier instructions are executed in the second tier runtime engine. The third tier instructions are executed in the third tier runtime engine. A debugger on the first tier debugs the executed instructions.