System and method for injecting hooks into Java classes to handle exception and finalization processing

A method for modifying a class file for path flow mapping comprising:

• executing a routine in a class;
• finding exception code in the routine;
• writing an exception record, wherein the exception record includes a routine identifier for the routine;
• throwing an exception;
• catching the exception in a second routine containing exception handler code corresponding to the exception code in the routine;
• and
• writing a catch record, wherein the catch record includes a routine identifier for the second routine.

A method for modifying a class file for path flow mapping comprising:

• finding exception code in a routine;
• inserting a hook adjacent to the exception code, wherein the hook contains a routine identifier for the routine;
• finding an exception table;
• and
• inserting a catch hook in a second routine at an offset specified by an entry in the exception table, wherein the catch hook contains a second routine identifier for the second routine and the entry in the exception table points to exception handler code in the second routine corresponding to the exception code in the routine.

A data processing system for modifying a class file for path flow mapping comprising:

• executing means for executing a routine in a class;
• finding means for finding exception code in the routine;
• writing means for writing an exception record, wherein the exception record includes a routine identifier for the routine;
• throwing means for throwing an exception;
• catching means for catching the exception in a second routine containing exception handler code corresponding to the exception code in the routine;
• and
• writing means for writing a catch record, wherein the catch record includes a routine identifier for the second routine.

A computer program product incorporated in a computer readable memory for modifying a class file for path flow mapping comprising:

• instruction means for executing a routine in a class;
• instruction means for finding exception code in the routine;
• instruction means for writing an exception record, wherein the exception record includes a routine identifier for the routine;
• and
• instruction means for throwing an exception;
• instruction means for catching an exception in a second routine containing exception handler code corresponding to the exception code in the routine;
• and
• instruction means for writing a catch record, wherein the catch record includes a routine identifier for the second routine.