Ejb 3.0 manual

To make an EJB entity read-only, use @Column annotations to mark its columns insertable=false and updatable=false. A read-only bean can be used to cache a database entry that is frequently accessed but rarely updated (externally by other beans). To use the new EJB beans, you should refer to EJB Programmer's Guide [ejb3_programmer_www.doorway.ru] 1 Chapter 1. Developing EJB Session Beans EJB Session Beans Description Introduction A Session Bean is composed of the following parts, which are developed by the Enterprise Bean. An EJB reference (see ejb specification, , p) is when a bean A wants to call methods on a bean B. We are talking about intra-bean calls also called B2B calls. This is not for clients (that is covered in the beginner trails) this is for bean calls all on the server. Most of these calls are done inside the server VM.

EJB ManyToMany Relationships: Introduction. EJB annotations can be used to define relationships between entity EJB's. ManyToMany relationships can cause some confusion at first. This article explains some of the considerations using a simple example. EJB (JSR ), along with Common Annotations for the Java Platform (JSR ), define a basic set of annotations for resource injection and interception, as part of the Java EE specification www.doorway.ru EE supports a limited subset of Dependency Injection (DI) called Resource injection which provide allows injection of objects from the JNDI environment, such as other Java EE. The manual installation process is significantly harder then the automatic installation which we normally recommend. In this installation process you will do the following: Install www.doorway.ru Download www.doorway.ru from the OpenEJB download page. Make webapps/openejb directory. Change to new webapps/openejb directory.

An EJB reference is called internal when the bean B is in the same application unit as the bean A. This means that the beans are physically packaged in the same jar. In this case, you must provide the ejb-link tag, and its value must match the ejb-name of bean B. You don't have to provide anything in the www.doorway.ru file. To make an EJB entity read-only, use @Column annotations to mark its columns insertable=false and updatable=false. A read-only bean can be used to cache a database entry that is frequently accessed but rarely updated (externally by other beans). Enterprise JavaBeans (EJB) technology is the server-side component architecture for Java Platform, Enterprise Edition (Java EE). EJB technology enables rapid and simplified development of distributed, transactional, secure and portable applications based on Java technology. EJB Specification Final Release.