What is bean managed persistence?

What is bean managed persistence?

Bean-Managed Persistence (BMP) occurs when the entity object manages its own persistence. The enterprise bean developer must implement persistence operations (e.g., JDBC, JDO, or SQLJ) directly in the enterprise bean class methods.

What is container managed bean?

In an enterprise bean with container-managed transaction demarcation, the EJB container sets the boundaries of the transactions. Container-managed transactions simplify development because the enterprise bean code does not explicitly mark the transaction’s boundaries. …

What is the difference between CMP and BMP in EJB?

CMP, or Container Managed Persistence, is known to be the simplest for bean developers to create, and is known to be the most complicated for the EJB servers to support. BMP, or Bean Managed Persistence, is known to manage synchronizing its state with databases, as engaged by the container.

When should I opt BMP over CMP?

Entity bean performance is a battle between the bean programmer and the EJB container programmer. The bottom line is that if your beans can be deployed in any application server, and you know what you are doing with JDBC and EJB (a very big concern!), BMP should always win out over CMP in performance.

What is EJB and its types?

EJB is an acronym for Enterprise Java Beans. It is a server-side software element. It encapsulates the business logic of an application. It is a specification for developing a distributed business application on the Java platform. There are three types of EJBs: Session Bean, Entity Bean, and Message-Driven Bean.

How will you define a bean for static inner class in XML?

As you know Java inner classes are defined within the scope of other classes, similarly, inner beans are beans that are defined within the scope of another bean. Thus, a element inside the or elements is called inner bean and it is shown below.

What is container managed transaction?

Container managed transactions are considered the place where the container (JEE Server) controls the boundaries of the transactions, when to begin, when to commit or to rollback.

What is CMP entity bean?

The entity bean is a coarse-grain bean that encapsulates functionality and represents data and dependent objects. An entity bean manages persistent data in one of two ways: container-managed persistence (CMP) and bean-managed persistence (BMP).

What is CMP in distributed technology?

Container-Managed Persistence (CMP) occurs when the entity object delegates persistence services. With CMP, the EJB container transparently and implicitly manages the persistent state. The enterprise bean developer does not need to code any database access functions within the enterprise bean class methods.

What is the use of EJB container?

EJB is a server-side software component that encapsulates business logic of an application. An EJB web container provides a runtime environment for web related software components, including computer security, Java servlet lifecycle management, transaction processing, and other web services.

What is EJB container product?

EJB container is a server-side component that comprises the business logic. It offers local and remote access to the enterprise beans. In other words, we can say that it provides a runtime environment for EJB applications within the application server. A single EJB container can have one or more EJB modules.

What is the scope of inner beans?

Inner beans are always anonymous and they are always created with the outer bean. It is not possible to inject inner beans into collaborating beans other than into the enclosing bean. So an inner bean has no scope and basically can’t be used by anything other than the enclosing bean.

What is a container-managed persistence Bean?

A container-managed persistence bean has a name, a primary table, one or more fields, zero or more relationships, and zero or more secondary tables, plus flags for consistency checking. You will need to map the CMP fields and CMR fields to the database using the elements in the sun-cmp-mappings.xmlfile.

How do I implement Container-Managed Persistence in EJB containers?

An EJB container needs two things to support container-managed persistence: Mapping—Information on how to map an entity bean to a resource, such as a table in a relational database Runtime environment—A container-managed persistence runtime environment that uses the mapping information to perform persistence operations on each bean

What is opencontainer-managed persistence?

Container-managed persistence automatically nullifies the relationship on the foreign key side and deletes the object without asking for confirmation. In the Java code, relationships are represented by object reference (either collections or fields that are typed to an EJB local interface), depending on the relationship cardinality.

Is there a third-party Container-Managed Persistence solution for the Enterprise JavaBeans specification?

In general, the objective is that any third-party container-managed persistence solution that fully supports the Enterprise JavaBeans Specification, v2.0 can be made to work with the Sun Java System Application Server. To use a third-party tool: Build your enterprise beans using the third-party O/R mapping tool.