Abstract: A computer-implemented method for replacing application methods at runtime may include identifying an application at runtime that includes a target method to replace at runtime with a source method, locating a target address of a target method data structure (that includes a target code pointer to method code of the target method) within memory at runtime that is referenced by a target class, determining a source address of a source method data structure (that includes a source code pointer to method code of the source method) within memory at runtime that describes the source method, and modifying the application at runtime to have the target class reference the source method instead of the target method by copying the source method data structure from the source address to the target address and, thereby, replacing the target code pointer with the source code pointer. Various other methods and systems are also disclosed.