A method and system for injecting exceptions into a JAVA enterprise application during execution of the JAVA enterprise application is disclosed. The Java enterprise application includes multiple Enterprise JAVA Bean (EJB) classes. The EJB classes include one or more EJB methods. Each EJB is scanned for exceptions, and corresponding interface points of the EJB. The exceptions are automatically injected at the corresponding interface points based on scanning the EJB. The exceptions are then thrown to callers of the EJB methods. The exceptions are thrown before beginning execution of business logic of the EJB methods. Finally, the response of the JAVA enterprise application to the injected exceptions is analyzed.