Implement Security in web.xml

The deployment descriptor, web.xml is the most important Java EE configuration piece of Java EE Web applications. The security configuration in this descriptor drives the semantics and operation of web container security. Hence it is very critical that web developers and administrators understand the various combinations possible in the security configuration in this descriptor.

Security Constraints

Security Constraints are least understood by web developers, even though they are critical for the security of Java EE Web applications. Specifying a combination of URL patterns, HTTP methods, roles and transport constraints can be daunting to a programmer or administrator. It is important to realize that any combination that was intended to be secure but was not specified via security constraints, will mean that the web container will allow those requests. Security Constraints consist of Web Resource Collections (URL patterns, HTTP methods), Authorization Constraint (role names) and User Data Constraints (whether the web request needs to be received over a protected transport such as TLS). We will told you using 3 use cases.