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The document details the process of EJB (Enterprise JavaBeans) invocation, which includes obtaining references through JNDI, invoking business methods, and managing session states between JSPs and EJBs. It covers the differences between session beans, entity beans, and message-driven beans, along with transaction management, callback methods, and the role of local interfaces. Additionally, it emphasizes the design considerations for session beans and entity beans, the use of EJB QL for database queries, and the management of bean lifecycles by the container.



































