BTT version 5.2 invoker is a hard coded EJB invocation framework. BTT version 6.1.2 provides a common invocation framework for POJO, EJB, Web Service, and JMS. These two frameworks are totally different. The API usage and configuration are also totally different. The EJB invocation information that is defined in the resource bundle file can be mapped to the EJB invoker definition in the file invoker.xml. BTT version 6.1.2 invoker is decoupled with BTT context and formatter. The usage of BTT version 6.1.2 invoker is simple and flexible comparing with the usage of BTT version 5.2 invoker. For detailed information about BTT version 6.1.2 invoker, see Invoker.