What is the EJB Container

byAsif Raza •
16
Enterprise java beans EJB are software components that run in a special environment called an EJB container. The EJB container hosts and manages an enterprise java bean in the same way as Java Web Server hosts a java servlet. All java beans functions perform with in EJB container. The EJB container manages every aspect/feature of an enterprise java bean at run time.

Java beans container is a run-time container that is deployed to a Java EE application server. The EJB container automatically creates when the java application server starts and give serves as an interface between a java bean and run-time services such as:

  • Life cycle management
  • Code generation
  • Persistence management
  • Security
  • Transaction management
  • Locking and concurrency control

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The EJB container isolates the Java beans from client applications to directly access. When a java client applications invoke an EJB remote method on an enterprise java bean, the EJB container first intercepts the invocation to ensure persistence, transactions, and security are applied properly to every operation a client performs on the java bean. The java bean container automatically manages transactions, security, and persistence for the java bean due to Java beans developers do not have to write this type of logic into the java bean codes. It provides the facility to Java EJB developers to focus just on encapsulating business rules while the EJB container takes care of everything else.
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