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Section 5. Example 1: Finder and Create methods

The Create method

Thus, far I havecovered defining the CMP fields. Another key feature CMP 2.0 defines

your

findByPrimaryKey()

method. Notice that

ejbFindByPrimaryKey()

is

absent from the entity bean class as it is defined by the EJB container. The finder

method,

findByPrimaryKey()

must be declared in the home interface (listed

below).

Lastly, lets cover the ability to create UserBeans. The

UserBean

entity class defines

two create methods.

ejbCreate()

and

ejbPostCreate()

. Since the e mail and

password CMP fields are read only (you don t have setter methods for e mail and

password CMP fields in the local interface), it is prudent to allow them to be initialized

using the

ejbCreate()

method as shown below.

package com.rickhightower.auth;

public abstract class UserBean implements EntityBean {

public String ejbCreate(String email, String password)

throws CreateException {

setEmail(email);

setPassword(password);

return null;

}

public void ejbPostCreate(String email, String password) { }

}

The Create method

One thing that you will notice is that the implementation of these methods is virtually

empty. Also notice, that the setEmail, setPassword methods that the

ejbCreate()

method calls are abstract; thus, they are defined by the EJB container during

deployment.

Remember that the

ejbCreate()

method gets called before the container inserts the

row into the database and the

ejbPostCreate()

gets called after the container

inserts the row into the database. Since the container, manages the creation of the

entity bean, the

ejbCreate()

method returns

null

. The corresponding create method

Introducing EJB CMP/CMR, Part 1 of 2

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