Entity Bean Example

Hello everybody
i need a simple example about EntityBean to deploy it on Sun Application Server 8 or 9 .....
i found examples in the J2EE tutorila but they are too huge,,, so i need a simple one please if any one has.......
thanks alot

Well Mr Eng this subject is very complicated anyway...
This helped me a lot...
MeTitus

Similar Messages

Problem in running entity bean examples

I am trying to run a entity bean example in my bea ,earlier i was getting the error
that the data source name could not be found ,and so i replaced the data source
name in my .xml file
as cgDataSource and now i am not finding that error ,and the
jsp page is also displayed ,but the data is not inserted into
my database table.
I tried it using my personal domain ,and i edited the weblogic.properties file
also ,but now i am getting the error that the data source name could not be found

Hi,
An error saying a data source can't be found indicates one of two problems:
1. The data source name in your cmp descriptor doesn't match the JNDI name of
the actual data source. To rule this out, verify the names are indeed the same.
2. The data source didn't deploy. Usually this is caused by the underlying connection
pool not deploying. Look in you server log to verify the data source and the
underlying connection pool both deployed properly.
- Matt
"Vipin Nair" <[email protected]> wrote:
>
I am trying to run a entity bean example in my bea ,earlier i was getting
the error
that the data source name could not be found ,and so i replaced the data
source
name in my .xml file
as cgDataSource and now i am not finding that error ,and the
jsp page is also displayed ,but the data is not inserted into
my database table.
I tried it using my personal domain ,and i edited the weblogic.properties
file
also ,but now i am getting the error that the data source name could
not be found

Example of client/servelt calling an Entity Bean(EJB 2.0)

Hi !!
Can somebody give any code of servlet or client calling an entity bean...please give any sample code... I am getting error while calling an entity bean in Servlet....
It says that the Jndi name not found
SERVLET CODE----------
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import javax.naming.*;
import javax.rmi.PortableRemoteObject;
import sfms.mtk.*;
import sfms.sec.*;
import java.util.*;
public class TestServletExample extends HttpServlet
     SecDbSecUserHome home;
     public void init(ServletConfig config)throws ServletException{
     //Look up home interface
          try
               Properties props = new Properties();
               System.out.println("Looking for Jndi ----->>");
               InitialContext ctx = new javax.naming.InitialContext();
               home = (SecDbSecUserHome)javax.rmi.PortableRemoteObject.narrow(ctx.lookup("SecUserJndi"), SecDbSecUserHome.class);
               System.out.println("Lookup is over ----->>");
          catch (Exception NamingException)
               NamingException.printStackTrace();
     public void doGet (HttpServletRequest request,HttpServletResponse response)throws ServletException, IOException
          MTKDataObject objDataObject = null;
          PrintWriter out;
          response.setContentType("text/html");
          String title = "EJB Example";
          out = response.getWriter();
          out.println("<HTML><HEAD><TITLE>");
          out.println(title);
          out.println("</TITLE></HEAD><BODY>");
          try
               System.out.println("*************STARTING NOW*************");
               Collection coll = home.findAllUsers();
               Iterator i =coll.iterator();
               while(i.hasNext())
                    SecDbSecUserRemote remote = (SecDbSecUserRemote)i.next();
                    System.out.println("User ID "+remote.getUserId());
                    System.out.println("FirstName "+remote.getFirstName());
          catch(Exception CreateException)
                    CreateException.printStackTrace();
          out.close();
     public void destroy()
          System.out.println("Destroy");
javax.naming.NameNotFoundException: SecUserJndi not found
<<no stack trace available>>
*************STARTING NOW*************
java.lang.NullPointerException
at TestServletExample.doGet(TestServletExample.java:49)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
at org.apache.catalina.core.ApplicationFilterChain.access$0(ApplicationFilterChain.java:197)
at org.apache.catalina.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:176)
at java.security.AccessController.doPrivileged(Native Method)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:172)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:243)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:201)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
at org.apache.catalina.valves.CertificatesValve.invoke(CertificatesValve.java:246)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2343)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:170)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:170)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
at org.apache.catalina.authenticator.SingleSignOn.invoke(SingleSignOn.java:368)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
at org.apache.catalina.connector.http.HttpProcessor.process(HttpProcessor.java:1012)
at org.apache.catalina.connector.http.HttpProcessor.run(HttpProcessor.java:1107)
at java.lang.Thread.run(Thread.java:484)
PLEASE DO REPLY ME BACK (ASAP)
Bhumika

There should be some error in looking up the Jndi..
In weblogic server I have been using the following code:
     try
          Context ctx = getContext.getInitialContext();
          HelloHome home = (HelloHome)ctx.lookup("MyHello");
          Hello hello = home.create();
          System.out.println(hello.display());
     catch(Exception e)
          System.out.println("Error :");
          e.printStackTrace();
     static String user = null;
     static String password = null;
     static String url = "t3://localhost:7001";
     * Gets an initial context.
     * @return Context
     * @exception java.lang.Exception if there is
     * an error in getting a Context
     static public Context getInitialContext() throws Exception
          Properties p = new Properties();
          p.put(Context.INITIAL_CONTEXT_FACTORY,"weblogic.jndi.WLInitialContextFactory");
          p.put(Context.PROVIDER_URL, url);
          if (user != null)
     System.out.println ("user: " + user);
     p.put(Context.SECURITY_PRINCIPAL, user);
               if (password == null)
                    password = "";
     p.put(Context.SECURITY_CREDENTIALS, password);
return new InitialContext(p);
this works fine in weblogic..
also check if ur classpath is ok..

EJB3.0 simple entity bean for customer example...

Can anyone provide a simple step by step instruction on how to start my application of a customer entity bean. like i could add / delete an entry to mySQL DB, i will use Sun as my appserver. im a newbie to ejb. i want to start with that CUSTOMER bean can anybody help pls ? thx! tata-yang

hello batzee i already have my appserver running
and found out that he place my EJBSample under Enterprise Application.
and with these modules inside:
-EJBsampleSun-ejb.jar EJBModule
-EJBsampleSun-war.war WebModule
my appserver has:
EJBsampleSun true ${com.sun.aas.instanceRoot}/applications/j2ee-apps/EJBsampleSun Redeploy
inside my application:
1. ejbsamplesun-ejb/src/conf/persistence.xml
<?xml version="1.0" encoding="UTF-8"?>
<persistence version="1.0" xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd">
<persistence-unit name="EJBsampleSun-ejbPU" transaction-type="JTA">
<provider>oracle.toplink.essentials.ejb.cmp3.EntityManagerFactoryProvider</provider>
<jta-data-source>jdbc/mySample_dbo</jta-data-source> //question: i have db in mysql named mySample_dbo with customer as my table did i declare it right?
<properties>
</properties>
</persistence-unit>
</persistence>
================
2. ejbsamplesun-ejb/src/java/ph/icomm/customer.class
package myejb.ph;
import java.io.Serializable;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.*;
@Entity
@Table(name="Customer")
public class Customer implements Serializable {
private int id;
private String name;
private String email;
private String phone;
@Id
@Column(name="ID")
public int getId() {
return id;
public void setId(int pk) {
id = pk;
@Column(name="Name")
public String getName() {
return name;
public void setName(String n) {
name = n;
@Column(name="Email")
public String getEmail() {
return email;
public void setEmail(String e) {
email = e;
@Column(name="Phone")
public String getPhone() {
return phone;
public void setPhone(String p) {
name = p;
================
3. ejbsamplesun-war/src/java/web/postcustomer.class
// and here is my servlet
//simply trying to fetch the data in my customer table with ID = 11
package web;
import java.io.*;
import java.net.*;
import javax.servlet.*;
import javax.servlet.http.*;
import ph.icomm.Customer;
import web.PostCustomer;
public class PostCustomer extends HttpServlet {
/** Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
* @param request servlet request
* @param response servlet response
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
/* TODO output your page here*/
out.println("<html>");
out.println("<head>");
out.println("<title>Servlet PostCustomer</title>");
out.println("</head>");
out.println("<body>");
try {
Customer pCustomer = new Customer();
pCustomer.setId(new Integer("11"));
out.println("Customer Name is"+pCustomer.getName());
out.println("<br>");
out.println("Customer Id is:"+pCustomer.getId());
out.println("<br>");
out.println("Customer Email is:"+pCustomer.getEmail());
out.println("<br>");
out.println("Customer Phone is:"+pCustomer.getPhone());
} catch(Exception e) {
System.out.println("I am inside Exception");
out.println("<h1>Servlet PostCustomer at " + request.getContextPath() + "</h1>");
out.println("</body>");
out.println("</html>");
out.close();
// <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
/** Handles the HTTP <code>GET</code> method.
* @param request servlet request
* @param response servlet response
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
/** Handles the HTTP <code>POST</code> method.
* @param request servlet request
* @param response servlet response
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
/** Returns a short description of the servlet.
public String getServletInfo() {
return "Short description";
// </editor-fold>
Now, is this complete ejb3.0 already? coz if ill try to RUN this project it give this error:
Deploying application in domain failed; Deployment Error -- null
C:\Inetpub\wwwroot\myfolder\_Project\EJBsampleSun\EJBsampleSun-ejb\nbproject\build-impl.xml:312: Deployment error:
The module has not been deployed.
See the server log for details.
BUILD FAILED (total time: 1 second)
This is quite a long post but have to make sure ill get your kind help and assistance. Thanks!
tata-yang

How do I create an Entity Bean with unknown primary keys

Hi,
Can a good folk help me.
I am mapping an entity bean to an oracle table for the purpose of logging . I do not need a primary key contraint on this table. How do I specify in my entity bean file descriptor not to use any field for primary key ...
I have done this so far...
in my ejb.xml file - I set....
<prim-key-class>java.lang.Object</prim-key-class>
and deleted ....
<primkey-field>...</primkey-field>
My table structure is .....
CREATE TABLE FAMS_REQUEST_LOG (
EDITEDBY VARCHAR2(20),
OLDTRANSDATE DATE,
REQUESTID VARCHAR2(30) NOT NULL,
OLDQTY NUMBER(20),
NEWQTY NUMBER(20),
NEWTRANSDATE DATE)
but I still get this error message on deploying...
[#|2006-03-01T14:30:29.250+0100|INFO|sun-appserver-pe8.1_02|javax.enterprise.system.tools.deployment|_ThreadID=19;|Total Deployment Time: 11000 msec, Total EJB Compiler Module Time: 0 msec, Portion spent EJB Compiling: 0%|#]
[#|2006-03-01T14:30:29.265+0100|SEVERE|sun-appserver-pe8.1_02|javax.enterprise.system.tools.deployment|_ThreadID=19;|Exception occured in J2EEC Phase
com.sun.enterprise.deployment.backend.IASDeploymentException: Fatal Error from EJB Compiler -- JDO74046: JDOCodeGenerator: Caught a MappingConversionException loading or creating mapping model for application 'fixassetenterpriseapp' module 'FixAssetEnterpriseApp-EJBModule': JDO71030: There is no column in table FAMS_REQUEST_LOG which can be used to support the servers implementation of unknown key classes.
at com.sun.ejb.codegen.CmpCompiler.compile(CmpCompiler.java:274)
at com.sun.ejb.codegen.IASEJBC.doCompile(IASEJBC.java:615)
at com.sun.ejb.codegen.IASEJBC.ejbc(IASEJBC.java:563)
at com.sun.enterprise.deployment.backend.EJBCompiler.preDeployApp(EJBCompiler.java:340)
at com.sun.enterprise.deployment.backend.EJBCompiler.compile(EJBCompiler.java:209)
at com.sun.enterprise.deployment.backend.AppDeployer.runEJBC(AppDeployer.java:284)
at com.sun.enterprise.deployment.backend.AppDeployer.deploy(AppDeployer.java:176)
at com.sun.enterprise.deployment.backend.AppDeployer.doRequestFinish(AppDeployer.java:107)
at com.sun.enterprise.deployment.phasing.J2EECPhase.runPhase(J2EECPhase.java:146)
at com.sun.enterprise.deployment.phasing.DeploymentPhase.executePhase(DeploymentPhase.java:71)
at com.sun.enterprise.deployment.phasing.PEDeploymentService.executePhases(PEDeploymentService.java:633)
at com.sun.enterprise.deployment.phasing.PEDeploymentService.deploy(PEDeploymentService.java:188)
at com.sun.enterprise.deployment.phasing.PEDeploymentService.deploy(PEDeploymentService.java:520)
at com.sun.enterprise.management.deploy.DeployThread.deploy(DeployThread.java:143)
at com.sun.enterprise.management.deploy.DeployThread.run(DeployThread.java:172)
|#]
Dotun

you will have to create a sequence and a trigger
CREATE SEQUENCE <SEQUENCE NAME>
INCREMENT BY 1
START WITH 1
NOCACHE
/this sequence will guarantee that each requested number is unique
the trigger will select from this sequence and insert the obtained value in the new record
CREATE OR REPLACE TRIGGER <TRIGGER NAME>
BEFORE INSERT ON <TABLE NAME>
REFERENCING NEW AS NEW OLD AS OLD
FOR EACH ROW
    BEGIN
        select
            <SEQUENCE NAME>.nextval
        into
            :NEW.<COLUMN NAME>
        from
            dual;
    END;
[/CODE]
this will always take the value from the sequence, even if you already provided a value yourself
(otherwise you will first have to test if :NEW.<column name> is null, but I wouldn't do this for a key column.
if you need the generated key back for further processing (inserting it into a child table for example), you can use the returning clause on the insert statement
see the oracle documentation for more information about sequences, triggers and the returning clause
greetings
Freek D
I am new to Oracle and need to know how to create a table that uses an automatic incrementation on a primay key for it's default. I need the uniqueness automatically managed by the DBMS.. This activity is know as setting the Column (primary key with identity) in Ms-SQL..
Your help would be appreciated greatly....
Thanks....

Container Managed Persistence entity bean relationship fields

I want to ask something that until now still confuse. Did Relationship fields in Container Managed Persistence entity beans declare , inside Database table or only Persistence fields .
If Relationship fields not declare inside database table ,how if SQL calls the relationship fields between related entity bean.
did container handle this task.
example: I have 2 entity bean with CMP(Container Managed Persistence)version 2.0
call Player and Team. every entity bean have own relationship fields and persistence fields.
player has playerId(primary key),name,position,age persistence fields and teams is relationship fields.
team has teamId(primary key),name,city and players is relationship fields.
I know that all persistence fields is declare in own database table but how about relationship fields.
can you tellme, How SQL calls can access relationship fields if relatiosnship fields is not declare in database table.
I use J2EE RI SDK version 1.3
and deploytool .
thank's .

thank's for your reply .Now I have another problem
I use J2EE RI from java.sun .I try to follow example in j2eetutorial about CMP Example call RosterApp.ear .
I dont'change anything code inside RosterApp.ear but when I deploy and runclient command thereis syntax error :
java.rmi.ServerException: Remote exception occured in server thread :nested exception is java.rmi.ServerException :exception thrown from bean :nested exception is : java.ejb.EJBException :nested exception is :java.sql.SQLException :syntax error or access violation ,message from server: "you have an error in SQL syntax near "
"leagueBeanTable" WHERE "leagueId" = 'L1' at line 1
in example ,RosterApp.ear use Cloudscape database ,but I try to use Mysql database for RosterApp.ear ,is there any different syntax SQL from Cloudscape to Mysql .
if like that ,so I must edit first SQL calls from Cloudscape to MYSQL . I think because relationship fields is for entity beans only ,so how if mysql database want to access foreign key another table because foreign key isn't declare in databse table.
example : I have 3 entity bean call player, team, league .
1. PlayerEJB have persistence fields name, position, playerId(primary key), cmr fields is teams
2. TeamEJB have persistence fields name, city, teamId (primary key) , cmr fields is players and leagues .
3. LeagueEJB have persistence fields name ,sport, leagueId(primary key), cmr fields is teams
so table is
PlayerEJB <--->TeamEJB<--->LeagueEJB
Player have some finder method call findBySport(String Sport) .
because Sport is persistence fields for LeagueEJB
so PlayerEJB must traverse TeamEJB first before LeagueEJB
EJB QL : SELECT distinct object(p) FROM Player (p) IN (p.teams) AS t
WHERE t.league.sport = ?1
I know that Container will translates EJB QL to SQL calls ,but default is only for cloudscape database and I use for MYsql .
so can you helpme how to query method findBySport(String sport) to Mysql calls .
thereis no foreign key between table in database table there is only Relationship fields in entity bean.

How to use same transaction when calling CMP entity beans and DAO (JDBC)

We are currently using Weblogic 8.1 SP2 with an Oracle 10g database (using XA thin and non-XA drivers).
We have a session bean that invokes an entity bean and a DAO (data access object pattern) in order to add data in 2 separate tables (account and history). Rows are added to the first (account) table using a CMP Entity bean while inserts are done in the 2nd (history) table using a DAO. Here is some pseudo code:
addHistorySessionBean (trans-attribute="Required")
begin
Step #1 - call addAccountEntityBean (trans- attribute="Required")
Step #2 - call addHistoryDAO (get datasource, connection)
end
The 2nd table (history) has a foreign key constraint to ensure that the corresponding key exists in the first (account) table. Unfortunately, DAO inserts on the 2nd (history) table fail with a foreign key constraint violation (INTEGRITY CONSTRAINT VIOLATION - PARENT KEY NOT FOUND!) since they cannot see the row added to the 1st (account) table in step #1 by the CMP entity bean.
How does one ensure that all this is done in a single transaction ? It appears that the app server creates two seperate transactions (one for the session bean facade and the entity bean and a 2nd transaction (when we retrieve a connection using the same data source JNDI name) for the DAO.
A post on server side suggested using a "<resource-ref>" in the session bean to tie the two potentially separate transactions together, but that does not work for us. However, I am not sure if we are doing that correctly. After we define the resource ref in the session facade bean, do we use the resource ref "name" attribute to lookup the datasource or do we still lookup the datasource by JNDI name ? Do we need to define the resource-ref tag in the entity bean also ?
Does Weblogic allow using a single transaction for this type of a scenario ? How does one specify within Weblogic that the same transaction should be utilized by the entity bean and any subsequent DAOs?
People have also suggested that we defer constraint checking until the transaction(s) are committed but that sounds like a work acount without addressing this issue. Would postponing the constraint checking in Oracle cause any additional overhead ?
Any suggestions with specific examples or documentation on how to address this issue will be gratefully appreciated.

Thanks for your suggestion. Unfortunately, this does not work since it appears that there are 2 separate transactions going on here. One, the original one initiated by the session bean and used by the entity bean and the other initiated by the DAO. Any other ideas appreciated.
Hi,
Try setting the delay-database-inserts tag to
ejbCreate in RDBMS descriptor file.
http://bernal/stage/wls/docs81/ejb/DDreference-cmp-jar
.html#1113981
vasanthi ramesh

Error while using sybase trigger with the CMP entity bean,ejb version 2.1

Hi All,
I am using ejb version 2.1 and using entity bean (Transaction required) ,i am trying to update data in sybase(ver 12.3) database table
I am using session bean(Transaction required) to update the multiple entity beans in a while loop.It is working fine .But when i am trying to run it with the trigger which updates multiple tables in different sybase databases on update of each entity.Then it throws NoSuchEntityException and it rollback the whole transaction.
My trigger has only few simple update statements and the trigger runs fine without my CMP entity bean.is the CMP does not support the update triggers in sybase or is it the problem with the transaction.
Please help
Thanks
Anshu

If you can have a look at a cmp example in the samples that ship with the server. My guess is that the weblogic-ejb-jar.xml file is missing the <persistence-use> element which for 810 would look like:
<persistence>
<persistence-use>
<type-identifier>WebLogic_CMP_RDBMS</type-identifier>
<type-version>7.0</type-version>
<type-storage>META-INF/weblogic-cmp-rdbms-jar.xml</type-storage>
</persistence-use>
</persistence>
I seem to recall that the elements might be slightly different in structure for the wls700 version of the DTD, so please check that (I cannot, I'm at home and don't have everything here).
Give that a try and see if it doesn't solve your compilation failure.
Also, the compilation should not be throwing a null pointer exception in a case like that, I consider that to be a bug.
-thorick

EJB 3.0 Entity Bean

Hi Friends,
I am Facing a problem in EJB 3.0 Entity Bean. I am Using Eclipse 3.3.2 and JBoss 4.2 Application Server. Im getting the error such as *"javax.naming.NameNotFoundException: EntityBean not bound"* when im trying to lookup the entity bean. Herewith i had attached the servlet code. Can anyone suggest me.
package common;
import java.io.IOException;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import example.BookRemote;
public class CounterServlet extends javax.servlet.http.HttpServlet implements javax.servlet.Servlet {
static final long serialVersionUID = 1L;
private BookRemote hello;
     public CounterServlet() {
          super();
     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
          // TODO Auto-generated method stub
          try
     InitialContext ctx = new InitialContext();
     hello = (BookRemote) ctx.lookup("EntityBean/remote");
     hello.test();
     Integer count = 1;
     request.setAttribute("counter", count);
     request.getRequestDispatcher("result.jsp").forward(request, response);
     catch (NamingException e)
     e.printStackTrace();
     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
          // TODO Auto-generated method stub
     }

I think the Bean haven't been registered. I had look into the jmx-console and this is the result which i have got for my sample application (EntityBean).
java:comp namespace of the EntityBean.ear/EntityBeanWeb.war application:
+- UserTransaction[link -> UserTransaction] (class: javax.naming.LinkRef)
+- env (class: org.jnp.interfaces.NamingContext)
| +- security (class: org.jnp.interfaces.NamingContext)
| | +- realmMapping[link -> java:/jaas/other] (class: javax.naming.LinkRef)
| | +- subject[link -> java:/jaas/other/subject] (class: javax.naming.LinkRef)
| | +- securityMgr[link -> java:/jaas/other] (class: javax.naming.LinkRef)
| | +- security-domain[link -> java:/jaas/other] (class: javax.naming.LinkRef)
Global JNDI Namespace
+- persistence.units:ear=EntityBean.ear,unitName=CounterServlet (class: org.hibernate.impl.SessionFactoryImpl)
+- persistence.units:ear=TaskEnitity.ear,unitName=FirstEjb3Tutorial (class: org.hibernate.impl.SessionFactoryImpl)
+- TopicConnectionFactory (class: org.jboss.naming.LinkRefPair)
+- jmx (class: org.jnp.interfaces.NamingContext)
| +- invoker (class: org.jnp.interfaces.NamingContext)
| | +- RMIAdaptor (proxy: $Proxy48 implements interface org.jboss.jmx.adaptor.rmi.RMIAdaptor,interface org.jboss.jmx.adaptor.rmi.RMIAdaptorExt)
| +- rmi (class: org.jnp.interfaces.NamingContext)
| | +- RMIAdaptor[link -> jmx/invoker/RMIAdaptor] (class: javax.naming.LinkRef)
+- HTTPXAConnectionFactory (class: org.jboss.mq.SpyXAConnectionFactory)
+- ConnectionFactory (class: org.jboss.mq.SpyConnectionFactory)
+- UserTransactionSessionFactory (proxy: $Proxy14 implements interface org.jboss.tm.usertx.interfaces.UserTransactionSessionFactory)
+- HTTPConnectionFactory (class: org.jboss.mq.SpyConnectionFactory)
+- XAConnectionFactory (class: org.jboss.mq.SpyXAConnectionFactory)
+- TransactionSynchronizationRegistry (class: com.arjuna.ats.internal.jta.transaction.arjunacore.TransactionSynchronizationRegistryImple)
+- UserTransaction (class: org.jboss.tm.usertx.client.ClientUserTransaction)
+- OnlineSurveyTool (class: org.jnp.interfaces.NamingContext)
| +- RegisterBean (class: org.jnp.interfaces.NamingContext)
| | +- remote (proxy: $Proxy79 implements interface online.IRegister,interface org.jboss.ejb3.JBossProxy,interface javax.ejb.EJBObject)
| +- OnlineSurveyBean (class: org.jnp.interfaces.NamingContext)
| | +- remote (proxy: $Proxy75 implements interface online.OnlineSurveyRemote,interface org.jboss.ejb3.JBossProxy,interface javax.ejb.EJBObject)
+- UILXAConnectionFactory[link -> XAConnectionFactory] (class: javax.naming.LinkRef)
+- UIL2XAConnectionFactory[link -> XAConnectionFactory] (class: javax.naming.LinkRef)
+- queue (class: org.jnp.interfaces.NamingContext)
| +- A (class: org.jboss.mq.SpyQueue)
| +- testQueue (class: org.jboss.mq.SpyQueue)
| +- ex (class: org.jboss.mq.SpyQueue)
| +- DLQ (class: org.jboss.mq.SpyQueue)
| +- D (class: org.jboss.mq.SpyQueue)
| +- C (class: org.jboss.mq.SpyQueue)
| +- B (class: org.jboss.mq.SpyQueue)
+- topic (class: org.jnp.interfaces.NamingContext)
| +- testDurableTopic (class: org.jboss.mq.SpyTopic)
| +- testTopic (class: org.jboss.mq.SpyTopic)
| +- securedTopic (class: org.jboss.mq.SpyTopic)
+- console (class: org.jnp.interfaces.NamingContext)
| +- PluginManager (proxy: $Proxy49 implements interface org.jboss.console.manager.PluginManagerMBean)
+- UIL2ConnectionFactory[link -> ConnectionFactory] (class: javax.naming.LinkRef)
+- HiLoKeyGeneratorFactory (class: org.jboss.ejb.plugins.keygenerator.hilo.HiLoKeyGeneratorFactory)
+- UILConnectionFactory[link -> ConnectionFactory] (class: javax.naming.LinkRef)
+- persistence.units:unitName=TestServlet (class: org.hibernate.impl.SessionFactoryImpl)
+- QueueConnectionFactory (class: org.jboss.naming.LinkRefPair)
+- UUIDKeyGeneratorFactory (class: org.jboss.ejb.plugins.keygenerator.uuid.UUIDKeyGeneratorFactory)

Deploying CMP entity bean throws compilation error.

Jdeveloper build works fine but the server deployment ( embedded) fails. I linked tools.jar to j2ee home dir, same version as jdev uses. Session beans deploy OK.
The table corr to the entity bean has a primary key and the entity bean was created by dragging-dropping table onto UML diagram.
error is >>>cmp-field of type 'java.lang.Long' does not have a no-arg constructor which is needed for properties/fields based mapping<<<, message details follow after dashed line.
Platform details - Jdeveloper 9.0.3 on mdk 9.0, JDK 1.4.1 ( JDK 1.3.1 also does the same).
[Starting OC4J using the following ports: HTTP=8988, RMI=23891, JMS=9227.]
/usr/java/j2sdk1.4.1/bin/java -hotspot -classpath /var/jdeveloper/j2ee/home/oc4j.jar -Xverify:none -Doracle.j2ee.dont.use.memory.archive=true -Xrs com.evermind.server.OC4JServer -config /home/demo/jdevhome/system9.0.3.1035/oc4j-config/server.xml
[waiting for the server to complete its initialization...]
Embedded OC4J startup time: 9611 ms.
Copying default deployment descriptor from archive at /home/demo/jdevhome/mywork/MyHRApplication/EJB-Tier/classes/META-INF/orion-ejb-jar.xml to deployment directory /home/demo/jdevhome/system9.0.3.1035/oc4j-config/application-deployments/current-workspace-app/classes...
Auto-deploying file:/home/demo/jdevhome/mywork/MyHRApplication/EJB-Tier/classes/ (No previous deployment found)... Error compiling /home/demo/jdevhome/mywork/MyHRApplication/EJB-Tier/classes: cmp-field of type 'java.lang.Long' does not have a no-arg constructor which is needed for properties/fields based mapping
Oracle9iAS (9.0.3.0.0) Containers for J2EE initialized

Please note that the data-source has been re-architectured in 10.1.3 DP3 and you should have DataSource as follows:
<data-sources xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xsi:noNamespaceSchemaLocation='http://xmlns.oracle.com/oracleas/schema/data-sources-10_1.xsd' schema-major-version='10' schema-minor-version='1'>
<managed-data-source connection-pool-name='Example Connection Pool' jndi-name='jdbc/OracleDS' name='OracleManagedDS' />
<connection-pool name='Example Connection Pool' >
<connection-factory factory-class='oracle.jdbc.pool.OracleDataSource' user='scott' password='tiger' url='jdbc:oracle:thin:@localhost:1521:orcl'>
</connection-factory>
</connection-pool>
</data-sources>

Entity bean with another class as primary key generator class

Hi All,
I have a CMP entity bean in which I generate the primary key using my own class know as unique id generator.
I use it in ejbCreate method in the following manner
public Long ejbCreate(HospitalData hospitalData) throws CreateException{
          Long myid = new Long(UniqueIdGenerator.getId());
          System.out.println("My id generated ====== "+myid);
          this.hospitalid = myid;
          System.out.println("My id generated ====== "+this.hospitalid);
          System.out.println("Came in ejbCreate method of HospitalEJB");
          this.hospitalname = hospitalData.getHospitalname();
          return null;
Can you tell me how I map this primary key in my ejb-jar.xml and jbosscmp-jdbc.xml.
Anyhelp would be appreciated.
Thanks
Sameer

"Bhamu" <[email protected]> wrote in message
news:9keuo4$[email protected]..
I am trying to develop an entity bean attached to a key which have a
composite key using Primary Key Class. When I use the findByPrimaryKey
method of the bean it throws an exception as follows,I notice that you are using the reference CMP plugin.
at com.netscape.server.ejb.SQLPersistenceManager.find(Unknown Source)I'm also willing to bet that you may have created your own primary key class
with a single field, rather than using the fields type as a primitive
primary key class. If you do this, then SQLPersistenceManager will break.
It is badly written, and has some stupid assumptions. The one I remember
the most is that if you only have one primary key field, then
SQLPersistenceManager assumes you have used a primitive type such as
java.lang.String or java.lang.Integer, to represent it, rather than creating
your own <Enity>Pk.java file.
SQLPersistenceManager works for toy examples, but in general I would say it
is broken and unusable. Either use BMP, or splash out the money for Coco
Base from Thought Inc. Currently the only CMP plugin for iPlanet App server,
other than the reference implementation, that I know of.

Error Deploying CMP Entity Bean

Hi,
I am new to Entity Beans and am trying to deploy a CMP Entity Bean without any success.
I did search this forum for similar issues and tried those suggestions as well but that has not helped. Was wondering if someone could help me out on this.
The Entity bean has 2 fields: name and description.
The ejb-jar.xml file for this bean is:
<enterprise-beans>
<entity>
<ejb-name>Product</ejb-name>
<home>example.cmp.ProductHome</home>
<remote>example.cmp.Product</remote>
<ejb-class>example.cmp.ProductBean</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>PRODUCTS</abstract-schema-name>
<cmp-field>
<field-name>name</field-name>
</cmp-field>
<cmp-field>
<field-name>description</field-name>
</cmp-field>
<primkey-field>name</primkey-field>
<query>
</query>
</entity>
</enterprise-beans>
The error that I get while deploying the bean is:
Error deploying EJB homes for: file:/C:/servers/oc4j1013/j2ee/home/applications/cmptest/cmptest.jar
java.lang.InstantiationException: Error looking up cmt-datasource at jdbc/OracleDS (name not found)
at com.evermind.server.ApplicationState.getDataSourceContainer(ApplicationState.java:384)
Error deploying file:/C:/servers/oc4j1013/j2ee/home/applications/cmptest/cmptest.jar
homes: Error looking up cmt-datasource at jdbc/OracleDS (name not found)
[java] [TopLink Severe]: 2005.04.17 10:22:20.156--ServerSession(28816172)--
Local Exception Stack:
[java] Exception [TOPLINK-7060] (TopLink (Oracle OC4J CMP) - 10g release 3(10.1.3.0) (Build 041129)): oracle.toplink.exceptions.ValidationException
[java] Exception Description: Cannot acquire data source [jdbc/OracleDS].
[java] Internal Exception: javax.naming.NameNotFoundException: jdbc/OracleDS not found
[java] at oracle.toplink.exceptions.ValidationException.cannotAcquireDataSource(ValidationException.java:208)
[java] at oracle.toplink.internal.ejb.cmp.oc4j.Oc4jNonJtaConnector.getOrCreateDataSource(Oc4jNonJtaConnector.java:62)
If anybody knows what the problem is please let me know.
Thanks in advance.
Bhupen

Please note that the data-source has been re-architectured in 10.1.3 DP3 and you should have DataSource as follows:
<data-sources xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xsi:noNamespaceSchemaLocation='http://xmlns.oracle.com/oracleas/schema/data-sources-10_1.xsd' schema-major-version='10' schema-minor-version='1'>
<managed-data-source connection-pool-name='Example Connection Pool' jndi-name='jdbc/OracleDS' name='OracleManagedDS' />
<connection-pool name='Example Connection Pool' >
<connection-factory factory-class='oracle.jdbc.pool.OracleDataSource' user='scott' password='tiger' url='jdbc:oracle:thin:@localhost:1521:orcl'>
</connection-factory>
</connection-pool>
</data-sources>

Entity Bean with Primary Key Class

Hi
I am trying to develop an entity bean attached to a key which have a
composite key using Primary Key Class. When I use the findByPrimaryKey
method of the bean it throws an exception as follows,
java.sql.SQLException: Parameter typecheck failed: invalid parameter type:
ORA-00000: normal, successful completion
at com.netscape.server.jdbc.PreparedStatement.verifyError(Unknown Source)
at com.netscape.server.jdbc.PreparedStatement.afterVerify(Unknown Source)
at com.netscape.server.jdbc.PreparedStatement.executeQuery(Unknown Source)
at com.netscape.server.ejb.SQLPersistenceManager.find(Unknown Source)
at
com.netscape.server.ejb.EntityDelegateManagerImpl.doPersistentFind(Unknown
Source)
at com.netscape.server.ejb.EntityDelegateManagerImpl.find(Unknown Source)
at com.kivasoft.eb.EBHomeBase.findSingleByParms(Unknown Source)
at
TestBean2.ejb_home_TestBean2_EntityBean2Bean.findByPrimaryKey(ejb_home_TestB
ean2_EntityBean2Bean.java:120)
at
TestBean2.ejb_kcp_skel_EntityBean2Home.findByPrimaryKey__TestBean2_EntityBea
n2__TestBean2_TestBKey(ejb_kcp_skel_EntityBean2Home.java:258)
at com.kivasoft.ebfp.FPRequest.invokenative(Native Method)
at com.kivasoft.ebfp.FPRequest.invoke(Unknown Source)
at
TestBean2.ejb_kcp_stub_EntityBean2Home.findByPrimaryKey(ejb_kcp_stub_EntityB
ean2Home.java:341)
at
TestBean2.ejb_stub_EntityBean2Home.findByPrimaryKey(ejb_stub_EntityBean2Home
..java:88)
at TestBean2.Simple1.defaultAction(Simple1.java:115)
at TestBean2.Simple1.doGet(Simple1.java:26)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:865)
at com.netscape.server.servlet.servletrunner.ServletInfo.service(Unknown
Source)
at com.netscape.server.servlet.servletrunner.ServletRunner.execute(Unknown
Source)
at com.kivasoft.applogic.AppLogic.execute(Unknown Source)
at com.kivasoft.applogic.AppLogic.execute(Unknown Source)
at com.kivasoft.thread.ThreadBasic.run(Native Method)
at java.lang.Thread.run(Thread.java:479)
javax.ejb.FinderException
at com.netscape.server.ejb.SQLPersistenceManager.find(Unknown Source)
at
com.netscape.server.ejb.EntityDelegateManagerImpl.doPersistentFind(Unknown
Source)
at com.netscape.server.ejb.EntityDelegateManagerImpl.find(Unknown Source)
at com.kivasoft.eb.EBHomeBase.findSingleByParms(Unknown Source)
at
TestBean2.ejb_home_TestBean2_EntityBean2Bean.findByPrimaryKey(ejb_home_TestB
ean2_EntityBean2Bean.java:120)
at
TestBean2.ejb_kcp_skel_EntityBean2Home.findByPrimaryKey__TestBean2_EntityBea
n2__TestBean2_TestBKey(ejb_kcp_skel_EntityBean2Home.java:258)
at com.kivasoft.ebfp.FPRequest.invokenative(Native Method)
at com.kivasoft.ebfp.FPRequest.invoke(Unknown Source)
at
TestBean2.ejb_kcp_stub_EntityBean2Home.findByPrimaryKey(ejb_kcp_stub_EntityB
ean2Home.java:341)
at
TestBean2.ejb_stub_EntityBean2Home.findByPrimaryKey(ejb_stub_EntityBean2Home
..java:88)
at TestBean2.Simple1.defaultAction(Simple1.java:115)
at TestBean2.Simple1.doGet(Simple1.java:26)
[03/Aug/2001 15:26:41:7] error: Exception: SERVLET-execution_failed: Error
in executing servlet Simat
javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
at javax.servlet.http.HttpServletple1: java.lang.ClassCastException:
com.netscape.server.deployment.EntityBeanDescriptor
Exception .service(HttpServlet.java:865)
at com.netscape.server.servlet.servletrunner.ServletInfo.service(Unknown
Source)
at com.netscape.server.servlet.servletrunner.ServletRunner.execute(Unknown
Source)Stack Trace:
java.lang.ClassCastException:
com.netscape.server.deployment.EntityBeanDescriptor
a
at com.kivasoft.applogic.AppLogic.execute(Unknown Source)
at com.kivasoft.applogic.AppLogic.ext
com.netscape.server.servlet.servletrunner.AppInfo.popWebAppDescriptor(Unknow
n Source)
at com.netscape.server.servlet.servletrunner.ServletInfo.service(Unknown
Source)
at com.netscape.server.seecute(Unknown Source)
at com.kivasoft.thread.ThreadBasic.run(Native Method)
at java.lang.Threadrvlet.servletrunner.ServletRunner.execute(Unknown
Source)
at com.kivasoft.applogic.AppLogic.execu.run(Thread.java:479)
te(Unknown Source)
at com.kivasoft.applogic.AppLogic.execute(Unknown Source)
at com.kivasoft.thread.ThreadBasic.run(Native Method)
at java.lang.Thread.run(Thread.java:479)
Any kind of help is appreciated. I am using iPlanet App Builder 6.0 with iAS
6.0 SP1.
Thanks
Bhaskara Murthy
Eclipse Networks Inc

"Bhamu" <[email protected]> wrote in message
news:9keuo4$[email protected]..
I am trying to develop an entity bean attached to a key which have a
composite key using Primary Key Class. When I use the findByPrimaryKey
method of the bean it throws an exception as follows,I notice that you are using the reference CMP plugin.
at com.netscape.server.ejb.SQLPersistenceManager.find(Unknown Source)I'm also willing to bet that you may have created your own primary key class
with a single field, rather than using the fields type as a primitive
primary key class. If you do this, then SQLPersistenceManager will break.
It is badly written, and has some stupid assumptions. The one I remember
the most is that if you only have one primary key field, then
SQLPersistenceManager assumes you have used a primitive type such as
java.lang.String or java.lang.Integer, to represent it, rather than creating
your own <Enity>Pk.java file.
SQLPersistenceManager works for toy examples, but in general I would say it
is broken and unusable. Either use BMP, or splash out the money for Coco
Base from Thought Inc. Currently the only CMP plugin for iPlanet App server,
other than the reference implementation, that I know of.

Error in weblogic.ejbc while deploying the CMP entity bean.!!!

Tried to deploy the entity bean[CMP] with the following folder structure.
examples [package]
Product.class
productBean.class
etc.
META-INF
ejb-jar.xml
weblogic-ejb-jar.xml.
weblogic-cmp-rdbms-jar.xml
created a jar..with the following command
1.jar cvf rgegcmp.jar examples META-INF
tried to create the stubs and skeletons using weblogic.ejbc command.
2. java weblogic.ejbc rgegcmp.jar rgegcmp1.jar
C:\btcomprj\BTCOMPRJ\classes>java weblogic.ejbc rgegcmp.jar rgegcmp1.jar
<Oct 11, 2004 4:29:29 PM IST> <Warning> <EJB> <010054> <EJB Deployment: Product has a
class examples.ProductBean which is in
the classpath. This class should only be located in the ejb-jar file.>
<Oct 11, 2004 4:29:29 PM IST> <Warning> <EJB> <010054> <EJB Deployment: Product has a
class examples.ProductHome which is in
the classpath. This class should only be located in the ejb-jar file.>
<Oct 11, 2004 4:29:29 PM IST> <Warning> <EJB> <010054> <EJB Deployment: Product has a
class examples.Product which is in the
classpath. This class should only be located in the ejb-jar file.>
<Oct 11, 2004 4:29:29 PM IST> <Warning> <EJB> <010054> <EJB Deployment: Product has a
class examples.ProductLocalHome which i
s in the classpath. This class should only be located in the ejb-jar file.>
<Oct 11, 2004 4:29:29 PM IST> <Warning> <EJB> <010054> <EJB Deployment: Product has a
class examples.ProductLocal which is in
the classpath. This class should only be located in the ejb-jar file.>
<Oct 11, 2004 4:29:29 PM IST> <Warning> <EJB> <010054> <EJB Deployment: Product has a
class examples.ProductPK which is in th
e classpath. This class should only be located in the ejb-jar file.>
ERROR: Error from ejbc: null
java.lang.NullPointerException
at
weblogic.ejb20.deployer.CompositeMBeanDescriptor.getPersistenceUseIdentifier(Composite
MBeanDescriptor.java:1484)
at weblogic.ejb20.deployer.CMPInfoImpl.<init>(CMPInfoImpl.java:104)
at
weblogic.ejb20.deployer.EntityBeanInfoImpl.<init>(EntityBeanInfoImpl.java:135)
at
weblogic.ejb20.deployer.BeanInfoImpl.createBeanInfoImpl(BeanInfoImpl.java:349)
at
weblogic.ejb20.deployer.MBeanDeploymentInfoImpl.initializeBeanInfos(MBeanDeploymentInf
oImpl.java:438)
at
weblogic.ejb20.deployer.MBeanDeploymentInfoImpl.<init>(MBeanDeploymentInfoImpl.java:16
5)
at weblogic.ejb20.ejbc.EJBCompiler.setupEJB(EJBCompiler.java:151)
at weblogic.ejb20.ejbc.EJBCompiler.compileEJB(EJBCompiler.java:332)
at weblogic.ejbc20.runBody(ejbc20.java:479)
at weblogic.utils.compiler.Tool.run(Tool.java:126)
at weblogic.ejbc.main(ejbc.java:29)
ERROR: ejbc found errors
1. want to know why Null pointer exception is thrown by 'weblogic.ejbc'...
is it indicating an error in my code(bean); .....
i dont know how to fix the error.
find the deployments descriptors which i have written for deployment.
weblogic-ejb-jar.xml
<?xml version="1.0"?>
<!DOCTYPE weblogic-ejb-jar PUBLIC
'-//BEA Systems, Inc.//DTD WebLogic 7.0.0 EJB//EN'
'http://www.bea.com/servers/wls700/dtd/weblogic-ejb-jar.dtd'>
<weblogic-ejb-jar>
<weblogic-enterprise-bean>
<ejb-name>Product</ejb-name>
<jndi-name>rgexample</jndi-name>
</weblogic-enterprise-bean>
</weblogic-ejb-jar>
ejb-jar.xml
<?xml version="1.0"?>
<!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>
<enterprise-beans>
<entity>
<ejb-name>Product</ejb-name>
<home>examples.ProductHome</home>
<remote>examples.Product</remote>
<local-home>examples.ProductLocalHome</local-home>
<local>examples.ProductLocal</local>
<ejb-class>examples.ProductBean</ejb-class>
<persistence-type>Container</persistence-type>
<prim-key-class>examples.ProductPK</prim-key-class>
<reentrant>False</reentrant>
<cmp-version>2.x</cmp-version>
<abstract-schema-name>ProductBean</abstract-schema-name>
<cmp-field>
<field-name>productID</field-name>
</cmp-field>
<cmp-field>
<field-name>name</field-name>
</cmp-field>
<cmp-field>
<field-name>description</field-name>
</cmp-field>
<cmp-field>
<field-name>basePrice</field-name>
</cmp-field>
<query>
<query-method>
<method-name>findByName</method-name>
<method-params>
<method-param>java.lang.String</method-param>
</method-params>
</query-method>
<ejb-ql>
<![CDATA[SELECT OBJECT(a) FROM ProductBean AS a WHERE name =
?1]]>
</ejb-ql>
</query>
<query>
<query-method>
<method-name>findByDescription</method-name>
<method-params>
<method-param>java.lang.String</method-param>
</method-params>
</query-method>
<ejb-ql>
<![CDATA[SELECT OBJECT(a) FROM ProductBean AS a WHERE description
= ?1]]>
</ejb-ql>
</query>
<query>
<query-method>
<method-name>findByBasePrice</method-name>
<method-params>
<method-param>double</method-param>
</method-params>
</query-method>
<ejb-ql>
<![CDATA[SELECT OBJECT(a) FROM ProductBean AS a WHERE basePrice =
?1]]>
</ejb-ql>
</query>
<query>
<query-method>
<method-name>findExpensiveProducts</method-name>
<method-params>
<method-param>double</method-param>
</method-params>
</query-method>
<ejb-ql>
<![CDATA[SELECT OBJECT(a) FROM ProductBean AS a WHERE basePrice >
?1]]>
</ejb-ql>
</query>
<query>
<query-method>
<method-name>findCheapProducts</method-name>
<method-params>
<method-param>double</method-param>
</method-params>
</query-method>
<ejb-ql>
<![CDATA[SELECT OBJECT(a) FROM ProductBean AS a WHERE basePrice < ?1]]>
</ejb-ql>
</query>
<query>
<query-method>
<method-name>findAllProducts</method-name>
<method-params>
</method-params>
</query-method>
<ejb-ql>
<![CDATA[SELECT OBJECT(a) FROM ProductBean AS a WHERE productID
IS NOT NULL]]>
</ejb-ql>
</query>
</entity>
</enterprise-beans>
<assembly-descriptor>
<container-transaction>
<method>
<ejb-name>Product</ejb-name>
<method-intf>Remote</method-intf>
<method-name>*</method-name>
</method>
<trans-attribute>Required</trans-attribute>
</container-transaction>
</assembly-descriptor>
</ejb-jar>
weblogic-cmp-rdbms-jar.xml
<!DOCTYPE weblogic-rdbms-jar PUBLIC
'-//BEA Systems, Inc.//DTD WebLogic 7.0.0 EJB RDBMS Persistence//EN'
'http://www.bea.com/servers/wls700/dtd/weblogic-rdbms20-persistence-700.dtd'>
<weblogic-rdbms-jar>
<weblogic-rdbms-bean>
<ejb-name>Product</ejb-name>
<data-source-name>examples-dataSource-demoPool</data-source-name>
<table-map>
<table-name>TORDER</table-name>
<field-map>
<cmp-field>productID</cmp-field>
<dbms-column>PRODUCTID</dbms-column>
</field-map>
<field-map>
<cmp-field>name</cmp-field>
<dbms-column>NAME</dbms-column>
</field-map>
<field-map>
<cmp-field>description</cmp-field>
<dbms-column>DESCRIPTION</dbms-column>
</field-map>
<field-map>
<cmp-field>basePrice</cmp-field>
<dbms-column>BASEPRICE</dbms-column>
</field-map>
</table-map>
</weblogic-rdbms-bean>
<create-default-dbms-tables>True</create-default-dbms-tables>
</weblogic-rdbms-jar>

If you can have a look at a cmp example in the samples that ship with the server. My guess is that the weblogic-ejb-jar.xml file is missing the <persistence-use> element which for 810 would look like:
<persistence>
<persistence-use>
<type-identifier>WebLogic_CMP_RDBMS</type-identifier>
<type-version>7.0</type-version>
<type-storage>META-INF/weblogic-cmp-rdbms-jar.xml</type-storage>
</persistence-use>
</persistence>
I seem to recall that the elements might be slightly different in structure for the wls700 version of the DTD, so please check that (I cannot, I'm at home and don't have everything here).
Give that a try and see if it doesn't solve your compilation failure.
Also, the compilation should not be throwing a null pointer exception in a case like that, I consider that to be a bug.
-thorick

CMP Entity Bean with database specific features

Hi there,
I�m studying Entity Beans and I'm doing some experiences with SQL Server.
At first, I built a CMP Bean and marked in deploytool to create the tables. Ok, it worked.
Now, I'm trying to interact to an existent database. But, I got a problem: the primary key is defined by the Server. I can read it and I can remove entries. But, when I try to insert some entry, I can't pass the key in SQL statement. I edited the generated statement to do it, but it doesn't work. I get a RollbackException.
My question is: is it possible to do what I'm intending to do with CMP? What am I doing wrong?
Do you think that, to do this, I should use BMP Entity beans?
Thanks in advance,
Anicio

"CMP provides you with database independence and less coding efforts."
BMP is not database dependent, unless you invoke database specific things in your SQL (something I do not do). CMP on the otherhand is inherently appserver specific (which was it's goal when BEA, IBM, et al. came up with it), and still limits your design possibilities. See this thread for an example:
http://forum.java.sun.com/thread.jsp?forum=13&thread=318785
As for less coding effort, that is a relative statment. Yes a simple CMP bean requires less coding to develop the first time. I personally view a few lines of SQL to load and store the data as being fairly trivial. But that needs to be offset with the problems inherent in using appserver specific CMP implementations.
As an example, try mapping WebSphere CMP to a pre-existing database without using IBM's IDE. It's an incredible pain in the ass since WebSphere does not come with a "meet-in-the-middle" solution. Any J2EE developer that has had the experience of working with different appservers (especially if they have had to port an app, as I have) can attest to the complications that arise with each implementation.
A BMP bean, written with non-DB-specific SQL, is the most portable, most flexible approach to EntityBeans. Yes, it requires the developer to be able to write some SQL, which should not take a significant amout of time. WRT queries, you have to write them, either SQL, EQL, or some appserver specific format.
As an aside, the use of code generators to simplify the creation of EJBs lends itself well to BMP. By using a (or writing your own) code generator, you can mitigate the annoying SQL bugs that creep up early in development.

Entity Bean Example

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