The program violates the Enterprise JavaBeans specification by using sockets.
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 [1].
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."
[1] Standards Mapping - Common Weakness Enumeration - (CWE) CWE ID 577
[2] The Enterprise JavaBeans 2.1 Specification Sun Microsystems