1. A method, comprising: determining a system library method based on a configuration file in an application library; generating a wrapper method for the system library method, wherein the wrapper method comprises: a first instruction to invoke the system library method; and a second instruction to invoke a method in an external library; and replacing a third instruction that invokes the system library method with a fourth instruction that invokes the wrapper method, wherein a binary class in a plurality of binary classes in the application library comprises the third instruction.