J2EE Interview questions and answers

21. What is business logic

The code that implements the functionality of an
application. In the Enterprise JavaBeans architecture,
this logic is implemented by the methods of an
enterprise bean.

22.What is business method

A method of an enterprise bean that implements the
business logic or rules of an application.

23. What is callback methods

Component methods called by the container to notify
the component of important events in its life cycle.



24. What is caller

Same as caller principal.

25. What is caller principal

The principal that identifies the invoker of the
enterprise bean method.

26. What is cascade delete

A deletion that triggers another deletion. A cascade
delete can be specified for an entity bean that has
container-managed persistence.



27. What is CDATA

A predefined XML tag for character data that means
"don't interpret these characters," as opposed to
parsed character data (PCDATA), in which the normal
rules of XML syntax apply. CDATA sections are
typically used to show examples of XML syntax.

28. What is certificate authority

A trusted organization that issues public key
certificates and provides identification to the
bearer.



29. What is client-certificate authentication

An authentication mechanism that uses HTTP over SSL,
in which the server and, optionally, the client
authenticate each other with a public key certificate
that conforms to a standard that is defined by X.509
Public Key Infrastructure.

30. What is comment

In an XML document, text that is ignored unless the
parser is specifically told to recognize it.