Business Logic Layer
Bringt Spring noch Vorteile gegenüber EJB 3.0 ?
Sunday, April 29th, 2007Was ist Spring? Spring ist ein beliebtes, aber nicht standardisiertes open source J2EE-framework.
Neues in EJB 3.0
Monday, April 23rd, 2007Was ändert sich in EJB 3.0 gegenüber EJB 2.x?
POJO
Monday, April 23rd, 2007Plain old Java Object, mit POJO’s baut man das Domain Model auf, ohne umfangreiche Konventionen wie bei Entity Beans einhalten zu müssen. Man konzentriert sich auf die fachlichen Aspekte (Rich Domain Model), so daß in der Session-Beans nur noch Transaction-Handling
Entity Beans
Thursday, March 15th, 2007An entity bean represents an object that contains data, such as a customer, an account, or an inventory item. Entity beans contain data values and methods that can be invoked on those values. The values are saved in a database (using JDBC) or some other data store. Entity beans can participate in transactions involving other [...]
Message-Driven Beans
Friday, March 9th, 2007Message-driven beans, introduced in the EJB 2.0 specification, are enterprise beans that handle asynchronous messages received from JMS Message Queues. JMS routes messages to a message-driven bean, which selects an instance from a pool to process the message.
Session Beans
Friday, March 9th, 2007A session bean is a transient EJB instance that serves a single client. Session beans tend to implement procedural logic; they embody actions more than data. The EJB container creates a session bean at a client’s request. It then maintains the bean as long as the client maintains its connection to the bean. Sessions beans [...]