A method and apparatus for locating errors is disclosed. A computer inserts an object reference into program code suspected of causing an error, the object reference having an initial class name. Responsive to execution of the program code, the computer generates a new class name for the object reference comprising the context information. The computer sets an object with the new class name as the object reference inserted into the program code suspected of causing the error, wherein the new class name of the object is located in computer memory in use by the executing program code. The computer then creates a record of the computer memory in use by the executing program code, the record including the context information in the form of the new class name of the object.