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Where is the usage of serialization in a webapplication.
Is it necessary that a form bean is serializable.
In tomcat what is the usage of sessions.ser file..
1) It is an app server dependent feature but the Servlet Spec says that if the servlet container wants to support distributed environments (sharing sessions across instances) and the like that it must accept objects that implement Serializable and be able to migrate them. Tomcat also supports storing the session state across server restarts for session objects that are serializable. You can turn this feature of Tomcat on or off in the conf/context.xml file (see comments there).
2) It would only be neceesary for a form bean to be Serializable if a) it is session scoped and b) you are using either distributed sessions or a feature such as Tomcat uses to persist the session which requires it.
3) The sessions.ser file is the file containing the serialized objects from the session. Tomcat uses this to preserve them across restarts of the server if you have it configured to do so (see above). In general a .ser file is a serialized Java object, which is a binary representation of the state of the object.