Relationships in CMP Entity Beans

Hi everyone;
There is a way to implement one-to-many and many-to many relationships in CMP Entity Beans, is there a way to specify a parametrized query or something that do the job on the DBMS?
Regards Francisco.

Container's cascade-deleting in jboss(tm)3.2.x working properly with any scope:
This example with 1 scope:
    <relationships>
        <ejb-relation>
            <ejb-relation-name>Region-Town</ejb-relation-name>
            <ejb-relationship-role>
                <ejb-relationship-role-name>region-has-towns</ejb-relationship-role-name>
                <multiplicity>One</multiplicity>
                <relationship-role-source>
                    <ejb-name>RegionBean</ejb-name>
                </relationship-role-source>
                <cmr-field>
                    <cmr-field-name>regionTowns</cmr-field-name>
                    <cmr-field-type>java.util.Set</cmr-field-type>
                </cmr-field>
            </ejb-relationship-role>
            <ejb-relationship-role>
                <ejb-relationship-role-name>town-belongs-to-region</ejb-relationship-role-name>
                <multiplicity>Many</multiplicity> <cascade-delete/>
                <relationship-role-source>
                    <ejb-name>TownBean</ejb-name>
                </relationship-role-source>
                <cmr-field>
                    <cmr-field-name>region</cmr-field-name>
                </cmr-field>
            </ejb-relationship-role>
        </ejb-relation>
    </relationships>

Similar Messages

  • Help:How to manage relationships in CMP Entity beans

    Hi everybody;
    I am using Oracle JDeveloper 9i release 2 and Oracle 9i database.
    How can I manage one-to-many and many-to-many relationships in a CMP Entity Bean, I tried to managed the relationships in code, calling the beans, searching for records, making loops and joining.
    Is there a better way to manage the relationships with out doing this in code?
    Because I think it is not good for performance.
    Regards Francisco

    public void selectCurriculum(ValueChangeEvent event){
    logger.info(event.getNewValue().getClass());
    Integer id = (Integer) event.getNewValue();
    Collection curriculums = curriculums().getCurriculums();
    ObjectCurriculum curriculum = null;
    for (Iterator iterator = curriculums.iterator(); iterator.hasNext();) {
    ObjectCurriculum objectCurriculum = (ObjectCurriculum) iterator.next();
    if(objectCurriculum.getId().equals(id)){
    curriculum = objectCurriculum;
    break;
    curriculum().setWholeObject(curriculum);
    logger.info("setting current curriculum");
    no message is logged

  • Composite Primary Key in M:N CMP Entity Bean Relationship

    Dear Sir/Madam,
         We are creating an Enterprise Application for our institute using EJB 2.0 specifiactions. In the course of developement, we are facing a problem in writing the CMP Entity Beans with EJB Relationships.
         We are having many to many relationship between two beans such that the primary key of one Entity Bean (let's call it A), serves as the foreign key of another Entity Bean (let's call it B). Further, this primary key of A as foreign key in B, participates in the composite key of B.
         The EJB Specifications require that the primary key field(s) of any bean (B, in our case) declared in the Primary Key class should be the subset of the 'cmp-field' declared in the deployment descriptor for that bean. As I said earlier, we have many to many relationship at play. Hence, we require to keep the foerign key in the 'cmr-field' in lieu of 'cmp-field'. In short, the component of primary key is in 'cmr-field' while, it is needed in both 'cmp-field' and 'cmr-field'. That's perfect from Database point of view but illogical from CMP Entity Bean's view.
         How can we write the deployment descriptor for such a CMP (BMP is working fine for above scenario) Entity Bean? Also, how can we write the Primary Key class? The problem is not just to find the solution, but find under the hood of EJB 2.0 specifications.
         Please help.

    I think you should realise that it would not be convenient to use CMP for everything. It is difficult to define complex relations using CMP. Mostly BMP os preferd since it gives the flexibility for the bean developer.
    Regards
    xH4x0r

  • Error While Deploying A CMP Entity Bean With A Composite Primary Key

    Hello all,
    I have a problem deploying CMP Entity beans with composite primary keys. I have a CMP Entity Bean, which contains a composite primary key composed of two local stubs. If you know more about this please respond to my post on the EJB forum (subject: CMP Bean Local Stub as a Field of a Primary Key Class).
    In the mean time, can you please tell me what following error message means and how to resolve it? From what I understand it might be a problem with Sun ONE AS 7, but I would like to make sure it's not me doing something wrong.
    [05/Jan/2005:12:49:03] WARNING ( 1896):      Validation error in bean CustomerSubscription: The type of non-static field customer of the key class
    test.subscription.CustomerSubscriptionCMP_1530383317_JDOState$Oid must be primitive or must implement java.io.Serializable.
         Update the type of the key class field.
         Warning: All primary key columns in primary table CustomerSubscription of the bean corresponding to the generated class test.subscription.CustomerSubscriptionCMP_1530383317_JDOState must be mapped to key fields.
         Map the following primary key columns to key fields: CustomerSubscription.CustomerEmail,CustomerSubscription.SubscriptionType. If you already have fields mapped to these columns, verify that they are key fields.Is it enough that a primary key class be serializable or all fields have to implement Serializable or be a primitive?
    Please let me know if you need more information to answer my question.
    Thanks.
    Nikola

    Hi Nikola,
    There are several problems with your CMP bean.
    1. Fields of a Primary Key Class must be a subset of CMP fields, so yes, they must be either a primitive or a Serializable type.
    2. Sun Application Server does not support Primary Key fields of an arbitrary Serializable type (i.e. those that will be stored
    as BLOB in the database), but only primitives, Java wrappers, String, and Date/Time types.
    Do you try to use stubs instead of relationships or for some other reason?
    If it's the former - look at the CMR fields.
    If it's the latter, I suggest to store these fields as regular CMP fields and use some other value as the PK. If you prefer that
    the CMP container generates the PK values, use the Unknown
    PrimaryKey feature.
    Regards,
    -marina

  • ORA-01407 when removing a CMP Entity Bean with WLS 9.1

    Hi all !
    I hope you can help me to solve this ?:|
    I'm migrating my application from WLS 8.1 SP3 to WLS 9.1.
    I'm getting now an SQLException when I try to remove a CMP Entity Bean.
    The stacktrace is as follows:
    java.sql.SQLException: ORA-01407: cannot update ("USER"."MY_TABLE"."THE_CMR_FIELD") to NULL
         at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:145)
         at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:331)
         at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:288)
         at oracle.jdbc.driver.T4C8Oall.receive(T4C8Oall.java:743)
         at oracle.jdbc.driver.T4CPreparedStatement.doOall8(T4CPreparedStatement.java:216)
         at oracle.jdbc.driver.T4CPreparedStatement.executeForRows(T4CPreparedStatement.java:1120)
         at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1278)
         at oracle.jdbc.driver.OraclePreparedStatement.executeInternal(OraclePreparedStatement.java:3415)
         at oracle.jdbc.driver.OraclePreparedStatement.executeUpdate(OraclePreparedStatement.java:3498)
         at weblogic.jdbc.wrapper.PreparedStatement.executeUpdate(PreparedStatement.java:128)
    Of course, I replaced the table and column names above to be more readable ;-)
    The table MY_TABLE has a CMR field called THE_CMR_FIELD. The column is not nullable in the database (by the way, it's an Oracle 9i).
    Everything is fine under WLS8.1
    I tried two different Oracle JDBC drivers (9.2.0.5 and 10.2.0.1.0), but the result is always the same within WLS9.1.
    Any ideas or suggestions (or even questions) are more than welcome!
    Thanks
    Eric

    What's even more weird is that I have what seams to be the same problem on Weblogic 6.1 (SP4).
    Here's the stacktrace:
    <pre>
    javax.ejb.EJBException:
    Start server side stack trace:
    java.sql.SQLException: ORA-01407: cannot update ("SCHEMA"."TIM_WP_DAY_CORE_PERIODS"."TWD_ID") to NULL
         at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:134)
         at oracle.jdbc.ttc7.TTIoer.processError(TTIoer.java:289)
         at oracle.jdbc.ttc7.Oall7.receive(Oall7.java:573)
         at oracle.jdbc.ttc7.TTC7Protocol.doOall7(TTC7Protocol.java:1891)
         at oracle.jdbc.ttc7.TTC7Protocol.parseExecuteFetch(TTC7Protocol.java:1093)
         at oracle.jdbc.driver.OracleStatement.executeNonQuery(OracleStatement.java:2047)
         at oracle.jdbc.driver.OracleStatement.doExecuteOther(OracleStatement.java:1940)
         at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:2709)
         at oracle.jdbc.driver.OraclePreparedStatement.executeUpdate(OraclePreparedStatement.java:589)
         at com.p6spy.engine.logging.P6LogPreparedStatement.executeUpdate(P6LogPreparedStatement.java:183)
         at weblogic.jdbc.jts.Statement.executeUpdate(Statement.java:503)
         at package.WorkPatternDayCorePeriods_vd9y46__WebLogic_CMP_RDBMS.__WL_store(WorkPatternDayCorePeriods_vd9y46__WebLogic_CMP_RDBMS.java:2317)
         at weblogic.ejb20.manager.DBManager.flushModified(DBManager.java:438)
         at weblogic.ejb20.internal.TxManager$TxListener.flushModifiedKeys(TxManager.java:552)
         at weblogic.ejb20.internal.TxManager.flushModifiedBeans(TxManager.java:298)
         at weblogic.ejb20.manager.BaseEntityManager.flushModifiedBeans(BaseEntityManager.java:1246)
         at weblogic.ejb20.cmp.rdbms.RDBMSPersistenceManager.flushModifiedBeans(RDBMSPersistenceManager.java:1106)
         at weblogic.ejb20.manager.BaseEntityManager.cascadeDeleteRemove(BaseEntityManager.java:840)
         at weblogic.ejb20.manager.DBManager.remove(DBManager.java:656)
         at weblogic.ejb20.internal.EntityEJBLocalObject.remove(EntityEJBLocalObject.java:97)
         at package.WorkPatternDayCorePeriodsEJB_vd9y46_ELOImpl.remove(WorkPatternDayCorePeriodsEJB_vd9y46_ELOImpl.java:722)
         at package.PersonWorkPatternBC.removeWorkPatternDay(PersonWorkPatternBC.java:571)
         at package.remove(PersonWorkPatternBC.java:708)
         at package.TimPersonCalendarServiceEJB.removeWorkPattern(TimPersonCalendarServiceEJB.java:140)
    </pre>
    In fact I have this setup:
    <pre>
    workpattern 1..n workpatternday -| 1..n dayperiod
    | 1..n daycoreperiod
    </pre>
    And before 'ejbRemove'ing the workpattern I first remove the days and before that the periods and core periods.
    I start with the periods and instead of removing them in the DB he tries to update the FK to the day with '' (p6spy result).
    When I remove the not null constraint on the foreign key everything passes to the day where the workpatternId cannot be set to null.
    He does not throw errors on the coreperiod (where the not null constraint to day is still present).
    When I invert the sequence of deleting
    (first the core periods then the 'regular' periods) he complains about the dayId on the core periods table.
    So it's completely absurd :S
    I hope weblogic 8.1 might solve this problem as this development code is still to be migrated to 8.1 before going in production...
    I would just like to know what's wrong. There are other places with just about the same relationships (CMR and DB) where he does not complain...

  • Using a CMP Entity Bean local stub as a field of another CMP Entity Bean

    Hello,
    Is it possible to implement a field of a CMP Entity bean as another CMP Entity bean and how is it done?
    I've seen a pseudo code for this in Ed Roman's Mastering EJBs, second edition, but I can't seem to get it to work (pages: 330 - 1:1 using CMP and 339 - fake M:N using CMP).
    I'm using SUN ONE Application Sever 7. Is this server capable of this?
    I'm trying to implement a fake M:N relationship using 3 beans: 2 for each side of the relationship and one as the "bridge" table.
    For example, the two beans on each side of the relationship are SubscriberBean, SubscriptionBean and the "bridge: bean is SubscriberSubscriptionBean. The SubscriberSubscriptionBean has two fields: SubscriberLocal stub and SubscriptionLocal stub.
    Please let me know if you need more information to answer this question.
    Thanks.
    Nikola

    Im sorry but i dont know about the example you are talking about. I kinda learn
    all those techniques from forums, articles and tutorials because book often suffer from
    not having the information im mostly looking for.
    As far as i understand you, you want to implement a bridge been, which is representing a row in a join table. So that if one side of the relation is deleted the join-table entry (your bridge-CMP-Bean) is cascaded. Right?
    First of all the simple part: (My approach)
    - The joint table is foreign keys only - without a relation description. -
    In this case you dont have to implement a bridge bean. Because it just wouldnt represent anything of sense.
    Lets think of an entity/table USER whith the columns name (PRIMARY KEY), and prename.
    Our second entity/table is ADDRESS with the columns road (PRIMARY KEY) and housenr.
    The join table is simply: USER_ADDRESS with fk_name (FOREIGN KEY) and fk_road (FOREIGN KEY) both on CASCADE DELETE. So if the address is deleted the mapping entry is deleted, too same for the user part:
    USER -> USER_ADDRESS <- ADDRESS.
    Our entity Beans are called User and Address in class-names JNDI-names and names.
    Now we want to create the CMR mapping so we can access the addresses of a user from the user bean directly. The methods on the user side are:
    public abstract Collection getAddresses();
    and
    public abstract void setAddresses(Collection new_addresses);
    the xdoclet comments on the User side are (for the getter only)
    * @ejb.interface-method
    * @ejb.relation
    *                name = "User-has-Addresses"
    *                role-name = "User-Addresses"
    *                target-ejb = "Address"
    *                target-multiple = "true"
    * @sunone.relation
    *                column="USER_ADDRESS.fk_name"               
    *                target="USER_ADDRESS.fk_road"               
    public abstract Collection getAddresses();
    for the other side of the relation we define in the Address-Entity
    public abstract Collection getUsers();
    and
    public void setUsers(Collection users);
    the xdoclet comments on the Address side are (for the getter only)
    * @ejb.interface-method
    * @ejb.relation
    *                name = "User-has-Addresses"
    *                role-name = "Address-User"
    *                target-ejb = "User"
    *                target-multiple = "true"
    * @sunone.relation
    *                target="USER_ADDRESS.fk_road"               
    *                column="USER_ADDRESS.fk_name"
    As we dont want the user or address to be deleted if the other side of the relation is deleted we dont specify cascade-delete="yes" in the ejb.relation namespace.
    The sun-cmp-mappings.xml should now look like this:
    (For the User - side)
    <!-- Relationship User-has-Addresses, role User-Addresses -->
    <cmr-field-mapping>
    <cmr-field-name>addresses</cmr-field-name>
    <column-pair>
    <column-name>USER_ADDRESS.fk_name</column-name>
    <column-name>USER_ADDRESS.fk_road</column-name>
    </column-pair>
    </cmr-field-mapping>
    and similar on the Address-Side:
    <cmr-field-mapping>
    <cmr-field-name>users</cmr-field-name>
    <column-pair>
    <column-name>USER_ADDRESS.fk_road</column-name>
    <column-name>USER_ADDRESS.fk_name>/column-name>
    </column-pair>
    </cmr-field-mapping>
    Dont forget that all elements in the Collection must be of the right Interface-type.
    First of all the harder part:
    Now what you might want is when the relation has some information specified like user live at address and is tenant or facility manager.
    The, in the first step you will have to implement the UserAddressRelation entity which will have to CMR fields of the 1:N type.(Just as you wish)
    Lets think of the example above extended by the relation type. Our relation bean is named UserAddressRelation.
    Now User has the methods as above but the classes in the Collection must now be of the UserAddressRelationLocal/Remote interface and not AddressLocal/Remote-interface.
    You will have to change the xdoclet comment to:
    * @ejb.interface-method
    * @ejb.relation
    *                name = "User-has-Addresses"
    *                role-name = "User-Address"
    *                target-ejb = "UserAddressRelation"
    *                target-multiple = "true"
    * @sunone.relation
    *                target="USER_ADDRESS.fk_name"               
    *                column="USER.name"
    So we now dont reference the other side bean directly. We reference the relation EntityBean. Do the similar changes on the other side.
    In particular you will have to specify 4 CMR mappings now:
    1. User to UserAddressRelation 1:N
    2. UserAddressRelation N:1
    3. Address to UserAddressRelation 1:N
    4. UserAddressRelation N:1
    Which i dont want to explain in detail now because its kinda all the same as above.
    Now you cann access the Addresses of a user in the way.
    UserLocal.getAddresses(); <- !you get the mappings!
    UserLocal.getAddresses().item(0).getAddress() <- you get the address (this is dirty coding just for understanding)
    UserLocal.getAddresses().item(0).getUserRole() <. you get the role of the user at this address.
    Hope this helped you. You are welcome to ask any detailed question.

  • Problem in creating CMP Entity Bean - Pls Help

    I am trying to build one simple project having jsps to get connected to CMP Entity Bean.
    But while deploying I am getting the following error...
    Nov 15, 2004 10:59:09... Info: End of log messages of the target system.
    Nov 15, 2004 10:59:09... Info: ***** End of SAP J2EE Engine Deployment (J2EE Application) *****
    Nov 15, 2004 10:59:09... Error: Execution of deployment action for "EntityCMPAppln" aborted:
    Caught exception during application deployment from SAP J2EE Engine's deploy service:
    java.rmi.RemoteException: Error occurred while starting application bcone.com/EntityCMPAppln and wait.
    Reason: Complex error : server ID 6155350:Application bcone.com/EntityCMPAppln cannot be started, because it has hard reference to resource CONFIG_DB with type javax.sql.DataSource, but it is not active on the server.
    (message ID: com.sap.sdm.serverext.servertype.inqmy.extern.EngineApplOnlineDeployerImpl.performAction(DeploymentActionTypes).REMEXC)
    Nov 15, 2004 10:59:09... Error: Deployment NOT successful for EntityCMPAppln
    Nov 15, 2004 10:59:09... Info: SDM configuration: Do not automatically start/stop J2EE Engine. Do not restore state of J2EE Engine now.
    Nov 15, 2004 10:59:09... Error: -
    At least one of the Deployments failed -
    Nov 15, 2004 11:05:16... Info: Request for Logon as admin accepted
    ===========================================
    Nov 15, 2004 11:05:08... Info: =   Starting to execute command 'remotegui'   =
    Nov 15, 2004 11:05:08... Info: ===============================================
    Nov 15, 2004 11:05:10... Info: SDM started successfully.
    Please tell me how to activate the CONFIG_DB reference in database. Or what Extra I have to do to run this example.
    Regards,
    Vivek Ojha

    Dear Benny,
    The code of the required files is pasted below....
    Application.XML
    <?xml version="1.0" encoding="UTF-8"?>
    <!DOCTYPE application PUBLIC "-//Sun Microsystems, Inc.//DTD J2EE Application 1.3//EN"
                                 "http://java.sun.com/dtd/application_1_3.dtd">
    <application>
        <display-name>EntityCMPAppln</display-name>
        <description>EAR description</description>
        <module>
            <ejb>EntityCMPEjb.jar</ejb>
        </module>
        <module>
            <web>
                <web-uri>EntityCMPWeb.war</web-uri>
                <context-root>/student</context-root>
            </web>
        </module>
    </application>
    Application-j2ee-engine.xml
    <?xml version="1.0" encoding="UTF-8"?>
    <!DOCTYPE application-j2ee-engine SYSTEM "application-j2ee-engine.dtd">
    <application-j2ee-engine>
         <provider-name>bcone.com</provider-name>
         <fail-over-enable
              mode="disable"/>
    </application-j2ee-engine>
    data-source-aliases.xml
    <?xml version="1.0" encoding="UTF-8"?>
    <!DOCTYPE data-source-aliases SYSTEM "data-source-aliases.dtd">
    <data-source-aliases>
         <aliases>
              <data-source-name>${com.sap.datasource.default}</data-source-name>
              <alias>STUDENTDB</alias>
         </aliases>
    </data-source-aliases>
    ejb-j2ee-engine.xml
    <?xml version="1.0" encoding="UTF-8"?>
    <!DOCTYPE ejb-j2ee-engine SYSTEM "ejb-j2ee-engine.dtd">
    <ejb-j2ee-engine>
         <enterprise-beans>
              <enterprise-bean>
                   <ejb-name>StudentBean</ejb-name>
                   <resource-ref>
                        <res-ref-name>jdbc/STUDENTDB</res-ref-name>
                        <res-link>STUDENTDB</res-link>
                   </resource-ref>
                   <entity-props/>
              </enterprise-bean>
         </enterprise-beans>
    </ejb-j2ee-engine>
    ejb-jar.xml
    <?xml version="1.0" encoding="UTF-8"?>
    <!DOCTYPE ejb-jar PUBLIC "-//Sun Microsystems, Inc.//DTD Enterprise JavaBeans 2.0//EN" "http://java.sun.com/dtd/ejb-jar_2_0.dtd">
    <ejb-jar>
         <description>EJB JAR description</description>
         <display-name>EJB JAR</display-name>
         <enterprise-beans>
              <entity>
                   <ejb-name>StudentBean</ejb-name>
                   <home>com.bcone.ejb.StudentHome</home>
                   <remote>com.bcone.ejb.Student</remote>
                   <ejb-class>com.bcone.ejb.StudentBean</ejb-class>
                   <persistence-type>Container</persistence-type>
                   <prim-key-class>java.lang.String</prim-key-class>
                   <reentrant>False</reentrant>
                   <cmp-version>2.x</cmp-version>
                   <abstract-schema-name>StudentBean</abstract-schema-name>
                   <cmp-field>
                        <field-name>studentId</field-name>
                   </cmp-field>
                   <cmp-field>
                        <field-name>lname</field-name>
                   </cmp-field>
                   <cmp-field>
                        <field-name>standard</field-name>
                   </cmp-field>
                   <cmp-field>
                        <field-name>fyear</field-name>
                   </cmp-field>
                   <cmp-field>
                        <field-name>fname</field-name>
                   </cmp-field>
                   <primkey-field>studentId</primkey-field>
                   <resource-ref>
                        <res-ref-name>jdbc/STUDENTDB</res-ref-name>
                        <res-type>javax.sql.DataSource</res-type>
                        <res-auth>Container</res-auth>
                   </resource-ref>
              </entity>
         </enterprise-beans>
    </ejb-jar>
    persistent.xml
    <?xml version="1.0" encoding="UTF-8"?>
    <!DOCTYPE persistent-ejb-map SYSTEM "persistent.dtd">
    <persistent-ejb-map>
         <locking
              type="Table"/>
         <db-properties>
              <data-source-name>CONFIG_DB</data-source-name>
              <database-vendor
                   name="SAPDB"/>
         </db-properties>
         <entity-beans>
              <entity-bean>
                   <ejb-name>StudentBean</ejb-name>
                   <table-name>TMP_STUDENTNEW</table-name>
                   <field-map
                        key-type="PrimaryKey">
                        <field-name>studentId</field-name>
                        <column>
                             <column-name>STUDENTID</column-name>
                        </column>
                   </field-map>
                   <field-map
                        key-type="NoKey">
                        <field-name>lname</field-name>
                        <column>
                             <column-name>LNAME</column-name>
                        </column>
                   </field-map>
                   <field-map
                        key-type="NoKey">
                        <field-name>standard</field-name>
                        <column>
                             <column-name>STANDARD</column-name>
                        </column>
                   </field-map>
                   <field-map
                        key-type="NoKey">
                        <field-name>fyear</field-name>
                        <column>
                             <column-name>FYEAR</column-name>
                        </column>
                   </field-map>
                   <field-map
                        key-type="NoKey">
                        <field-name>fname</field-name>
                        <column>
                             <column-name>FNAME</column-name>
                        </column>
                   </field-map>
              </entity-bean>
         </entity-beans>
         <relationships/>
    </persistent-ejb-map>
    StudentBean.java
    package com.bcone.ejb;
    import javax.ejb.EntityBean;
    import javax.ejb.EntityContext;
    import javax.ejb.RemoveException;
    import javax.ejb.CreateException;
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    @cmpVersion 2.x
    @ejbHome <{com.bcone.ejb.StudentHome}>
    @ejbPrimaryKey <{java.lang.String}>
    @ejbRemote <{com.bcone.ejb.Student}>
    @hasSimplePK true
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         public void ejbStore() {
         public void ejbRemove() throws RemoveException {
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         public void ejbPassivate() {
         public void setEntityContext(EntityContext context) {
              myContext = context;
         public void unsetEntityContext() {
              myContext = null;
         private EntityContext myContext;
    @primKeyField
         public abstract String getStudentId();
         public abstract void setStudentId(String studentId);
         public abstract String getLname();
         public abstract void setLname(String lname);
         public abstract String getFname();
         public abstract void setFname(String fname);
         public abstract String getStandard();
         public abstract void setStandard(String standard);
         public abstract String getFyear();
         public abstract void setFyear(String fyear);
    Create Method.
         public String ejbCreate(
              String studentId,
              String fname,
              String lname,
              String standard,
              String fyear)
              throws CreateException {
              setStudentId(studentId);
              setFname(fname);
              setLname(lname);
              setStandard(standard);
              setFyear(fyear);
              return null;
    Post Create Method.
         public void ejbPostCreate(
              String studentId,
              String fname,
              String lname,
              String standard,
              String fyear) {
              // TODO : Implement
    StudentData.java
    Created on Nov 14, 2004
    To change the template for this generated file go to
    Window&gt;Preferences&gt;Java&gt;Code Generation&gt;Code and Comments
    package com.bcone.data;
    @author Administrator
    To change the template for this generated type comment go to
    Window&gt;Preferences&gt;Java&gt;Code Generation&gt;Code and Comments
    public class StudentData {
         private String studentId;
         private String fname;
         private String lname;
         private String standard;
         private String fyear;
    @return
         public String getFname() {
              return fname;
    @return
         public String getFyear() {
              return fyear;
    @return
         public String getLname() {
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    @return
         public String getStandard() {
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         public String getStudentId() {
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    @param string
         public void setFyear(String string) {
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    @param string
         public void setLname(String string) {
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    @param string
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         public void setStudentId(String string) {
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                   Title
              </title>
         </head>
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      <!--webbot bot="SaveResults" startspan U-File="_private/form_results.txt"
      S-Format="TEXT/CSV" S-Label-Fields="TRUE" ><input TYPE="hidden" NAME="VTI-GROUP" VALUE="0"><!webbot
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    %>
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              Student rem = home.create(remote.setFname(stu.getStudentId(),stu.getFname(),stu.getLname(),stu.getStandard(),stu.getFyear());
              out.println(stu.getStudentId() + "Student Created");
         } else if ("modify".equals(str)) {
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              remote.setFname(stu.getFname());
              remote.setFname(stu.getLname());
              remote.setFname(stu.getStandard());
              remote.setFname(stu.getFyear());
              out.println(stu.getStudentId() + "Student modified");
         } else if ("delete".equals(str)) {
              Student stu1  = home.findByPrimaryKey(stu.getStudentId());
              stu1.remove();
              out.println(stu.getStudentId() + "Student deleted");
    } catch (Exception e) {
         out.println("Exception e"+e.toString());
    %>
         </body>
    </html>
    Regards,
    Vivek Ojha

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    Hi There,
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    WARNING: "IOP00810257: (MARSHAL) Could not find class"
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         at com.sun.corba.ee.impl.io.ValueHandlerImpl.readValueInternal(ValueHandlerImpl.java:330)
         at com.sun.corba.ee.impl.io.ValueHandlerImpl.readValue(ValueHandlerImpl.java:296)
         at com.sun.corba.ee.impl.encoding.CDRInputStream_1_0.read_value(CDRInputStream_1_0.java:1034)
         at com.sun.corba.ee.impl.encoding.CDRInputStream_1_0.read_value(CDRInputStream_1_0.java:879)
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         at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
         at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
         at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
         at java.lang.reflect.Constructor.newInstance(Constructor.java:494)
         at com.sun.corba.ee.spi.servicecontext.ServiceContextData.makeServiceContext(ServiceContextData.java:114)
         at com.sun.corba.ee.spi.servicecontext.ServiceContexts.unmarshal(ServiceContexts.java:195)
         at com.sun.corba.ee.spi.servicecontext.ServiceContexts.get(ServiceContexts.java:365)
         at com.sun.corba.ee.spi.servicecontext.ServiceContexts.get(ServiceContexts.java:353)
         at com.sun.corba.ee.impl.protocol.CorbaClientRequestDispatcherImpl.processResponse(CorbaClientRequestDispatcherImpl.java:470)
         at com.sun.corba.ee.impl.protocol.CorbaClientRequestDispatcherImpl.marshalingComplete(CorbaClientRequestDispatcherImpl.java:327)
         at com.sun.corba.ee.impl.protocol.CorbaClientDelegateImpl.invoke(CorbaClientDelegateImpl.java:158)
         at com.sun.corba.ee.impl.presentation.rmi.StubInvocationHandlerImpl.invoke(StubInvocationHandlerImpl.java:129)
         at com.sun.corba.ee.impl.presentation.rmi.bcel.BCELStubBase.invoke(Unknown Source)
         at ctaejb.entitybean.order._IOrderHome_DynamicStub.findByPrimaryKey(_IOrderHome_DynamicStub.java)
         at mainapp.CTestApplication.main(CTestApplication.java:32)
    Caused by: java.lang.ClassNotFoundException
         ... 27 more
    org.omg.CORBA.UNKNOWN: vmcid: 0x0 minor code: 0 completed: Maybe
         at com.sun.corba.ee.spi.servicecontext.UEInfoServiceContext.<init>(UEInfoServiceContext.java:34)
         at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
         at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
         at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
         at java.lang.reflect.Constructor.newInstance(Constructor.java:494)
         at com.sun.corba.ee.spi.servicecontext.ServiceContextData.makeServiceContext(ServiceContextData.java:114)
         at com.sun.corba.ee.spi.servicecontext.ServiceContexts.unmarshal(ServiceContexts.java:195)
         at com.sun.corba.ee.spi.servicecontext.ServiceContexts.get(ServiceContexts.java:365)
         at com.sun.corba.ee.spi.servicecontext.ServiceContexts.get(ServiceContexts.java:353)
         at com.sun.corba.ee.impl.protocol.CorbaClientRequestDispatcherImpl.processResponse(CorbaClientRequestDispatcherImpl.java:470)
         at com.sun.corba.ee.impl.protocol.CorbaClientRequestDispatcherImpl.marshalingComplete(CorbaClientRequestDispatcherImpl.java:327)
         at com.sun.corba.ee.impl.protocol.CorbaClientDelegateImpl.invoke(CorbaClientDelegateImpl.java:158)
         at com.sun.corba.ee.impl.presentation.rmi.StubInvocationHandlerImpl.invoke(StubInvocationHandlerImpl.java:129)
         at com.sun.corba.ee.impl.presentation.rmi.bcel.BCELStubBase.invoke(Unknown Source)
         at ctaejb.entitybean.order._IOrderHome_DynamicStub.findByPrimaryKey(_IOrderHome_DynamicStub.java)
         at mainapp.CTestApplication.main(CTestApplication.java:32)

    Forget it. All the code works. I didn't know that the Sun App Server required a Persistence Manager to work with CMP entity beans. Once I added the persistence manager, all was OK. Have a good day.

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