William Kemp

Security is any mechanism that can be used to protect and validate resources. There are many security models that can be used to protect the data. The security model may use encryption, access control, or several other security methods. Authorization, or access control, has different security services that may be used to protect the resources. One method may be the Java Authentication and Authorization Service (JAAS), and another is Windows 2000 Active Directory. This article focuses on the JAAS security service. Two of the most basic security mechanisms are authentication and authorization. Authentication is simply the identification of an entity. Authorization is the decision process for granting the entity access rights to any data resources or information. The JDK 1.4 comes standard with services that provide both authentication and authorization. These services ... (more)

Asynchronous Messaging with WebLogic Server, Server Sessions, and MDBs

A synchronous message processing is a requirement of many applications that need to send and receive messages in real time or near real time. The JMS 1.0.2 Specification defines the MessageListener interface that allows an application to receive messages asynchronously from a JMS Destination when a message is sent to that destination. An implementation of the MessageListener interface is typically a client application to a JMS provider that runs in a remote JVM. The JMS Specification also defines an optional set of APIs, JMS Application Server Facilities, that may be implemented... (more)