i use j2sdkee1.2.1 to develop a web appliction but i dont know if it is just a testing server or a high performance server?
It is just a testing J2EE server and you are not licensed to use the server in development or deployment of a J2EE application, as specified in the license. There are open source J2EE Application servers like JBoss, which is in my perception a very good app server.
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