EJB Bad Practices: Use of Sockets
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Last revision (mm/dd/yy): 06/3/2009
The program violates the Enterprise JavaBeans specification by listening on a socket or accept connections on a socket. However it can act as a network socket client.
The Enterprise JavaBeans specification requires that every bean provider follow a set of programming guidelines designed to ensure that the bean will be portable and behave consistently in any EJB container .
In this case, the program violates the following EJB guideline:
"An enterprise bean must not attempt to listen on a socket, accept connections on a socket, or use a socket for multicast."
A requirement that the specification justifies in the following way:
"The EJB architecture allows an enterprise bean instance to be a network socket client, but it does not allow it to be a network server. Allowing the instance to become a network server would conflict with the basic function of the enterprise bean – to serve the EJB clients."
Related Technical Impacts
-  Enterprise JavaBeans 2.1 Specification. Sun Microsystems. http://java.sun.com/products/ejb/docs.html.