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In this section we will be discussing version 6.1 of the WebLogic server. Two variations of version 6.1 are available.
The first variation takes advantage of the J2EE version 1.3 features. In the absence of a pressing argument to the contrary, this is the version you will probably want to install. However, for licensing reasons having little to do with WebLogic, the company is also compelled to provide a version certified to run on J2EE version 1.2. It is the same software, with the obvious exception that those features that rely on J2EE 1.3[2] have been disabled. My recommendation is to start with the J2EE 1.3 compatible version and treat the other as a fallback.
[2] Specifically including Enterprise JavaBeans 2.0, Java Server Pages 1.2, Servlet 2.3, and J2EE Connector Architecture 1.0.