The Research And Analysis Of Calling Each Other Between Heterogenous Distributed Object Below J2EE Framework

Middleware is a kind of dependent system software or application, it can shield the differences of network hardware platform and heterogeneousness between operating system and network protocols, which makes distributed application software can share resources from different technologies. Nowadays, object-oriented distributed middleware has made much progress, but there are many problems to solve in practical application, the interoperability of different distributed object is one of the hot topics in these problems. The current dominant middleware technologies are CORBA,COM and EJB. This paper pays attention to CORBA and EJB and tries to integrate EJB with CORBA, the integration can fully develope their advantages, especially the CORBA's advantage of regardless of language,which can reuse heterogeneous softwares.First, this paper analyzed the principle of EJB of J2EE, emphasized the naming service in developing EJB and stated the steps of developing EJB.Second, the paper analyzed the standard of CORBA deeply, payed more attention on the characteristic technology of CORBA, and gave an example to show how to develop CORBA client and server and demonstrated its running mechanism. The interoperability of RMI and CORBA is the premis and basis of interoperability of EJB and CORBA, So, the paper proved feasibility of bridging RMI and CORBA. In the cources of proving, it compared RMI to CORBA, listed the imcompatibilites and gave solutions, then concludes that it's feasible to integrate RMI and CORBA. One of the significances RMI-CORBA is to made EJB can visit CORBA. At last, it gave two methods of integrating EJB and CORBA, lists specific steps and programmed for one of them.