Question on Persistence (Entity Beans, Hibernate, JDBC)

Hi everybody!
Until now, I have read a lot about persistence in the J2EE-sector, but I am still confused about which technology to used in my case.
I hope, that maybe you can give me some hints, by telling me which technology is good or bad regarding my requirements:
I want to build a customer- and order-management system fullfilling the following requirements:
1. The client is a Java application, the server is a JBOSS 4.0.1
2. The databasa scheme exists already and I'm not allowed to change it.
Some data, that logically belongs together and which shall be presented together to the client is distributed over 2 database tables.
3. The user cannot just create new and view data, but will also edit existing data quite often.
4. The user can assign products to an order. Often, there will be more than 1000 products assigned to an order, which will be presented to the user as a table (e.g. JTable). The user can then edit each cell of that 1000-row table, which of course will lead to an update in the db.
5. The user can also assign customers to a specific role in an order-process. On the other hand, each customer can make many orders.
So, we have a n:m relation here with the db-tables Customer, Order, OrderCustomer.
6. A complex search functionality has to be implemented, where the db-query is created dynamically at runtime.
7. The application is a multi-user application (about 10 users). It will be very rare, that users will work on the same data at the same time, but it might happen.
8. The database type (SAP DB) will not be changed in the near future.
With these 8 requirements in mind, I dealed a lot with EntityBeans, Hibernate and JDBC with SesseionBeans during the last 2 weeks.
Until now, I came to the following conclusions.
Hibernate is too slow. That'S bad, for data is edited very often and sometimes I want to edit just a single cell in 1000-row table.
Hibernate's biggest advantage - that it makes your application independent of the database type - is not even required (see point 8).
JDBC with SessioBeans: Very fast (I tried a simple query and it was about 10 times faster than Hibernate).
The disadvantage is, that I have to take care about all the transaction, concurrency control etc. things.
If I use JDBC, I want to do it that way: A SessionFacade accesses a DAO-object which executes the DB-query and returns the result to the SessionFacade which in the last step will pass the result to the client.
Entity Beans: I am completely confused with Entity Beans.
I read a lot about the CompositeEntity-Pattern for BMP. But on sun's J2EE Pattern page (http://java.sun.com/blueprints/corej2eepatterns/Patterns/CompositeEntity.html)
they said, that it's just useful when using the EJB 1.1 specification, because from EJB 2.0. the container or whatever will take care about lazy loading and store optimization.
So, from EJB 2.0. you should prefer using CMP-Beans with Container Managed Relationships (CMR), but as I heard, the dependent objects cannot be accessed and changed by the client when using CMPBeans with CMR.
However, a simple DB/Entity-mapping will not work in my case, because as mentioned above, there are thousands of products from the db to be managed at the same time. So here, I thought, the Composite pattern with its lazy loading strategy would be useful.
Furthermore, I have an n:m relationship in my database scheme, which is not trivial to map to entity beans. And don't forget that some related data is spread over 2 databse tables.
To sum it up, it would be very nice if some of you could clarify this perisistence nightmare, especially some clarification about if and how to use EntityBeans when having n:m relationships, editing data a lot, managing lots of table rows at once and having related data distributed over 2 database tables.
So, which technology would you prefer with the 8 requirements in mind? Hibernate, Entity Beans or JDBC with SessionBeans? Or would you prefer a mixed solution?
Thanx for every hint.
Regards,
egon

Here the requested information about the test:
Goal:
Find all customers, who's branches have the String "Branch" in their name.
Both times, a simple client accesses the same SessionBean in a JBOSS-Container.
This Bean has 2 methods. One accesses the DB via Hibernate (executeCriteria), the other one via JDBC (executeCriteriaJDBC).
The code to count the seconds of computation is as follows:
long startTime = System.currentTimeMillis();
List customerList = bean.executeCriteria(dc);
System.out.println("Hibernate: "+((System.currentTimeMillis()-startTime)/1000.0f)+" sek");
startTime = System.currentTimeMillis();
List customerListJDBC = bean.executeCriteriaJDBC(query);
System.out.println("JDBC: "+((System.currentTimeMillis()-startTime)/1000.0f)+" sek");
HIBERNATE:
CODE:
Branch Branch = new Branch();
Branch.setName("%Branch%");
Example example = Example.create(Branch);
DetachedCriteria dc = DetachedCriteria.forClass(Customer.class)
.createCriteria("branches").add(example.enableLike()).setResultTransformer(Criteria.DISTINCT_ROOT_ENTITY);
QUERY:
select
 this_.UUID as UUID1_1_,
 this_.NAME as NAME1_1_,
 this_.CUSTOMERNO as CUSTOMERNO1_1_,
 this_.SHORTDESC as SHORTDESC1_1_,
 this_.LONGDESC as LONGDESC1_1_,
 this_.TAXNUMBER as TAXNUMBER1_1_,
 this_.SALESTAXID as SALESTAXID1_1_,
 this_.ACCOUNTHOLDER as ACCOUNTH8_1_1_,
 this_.BANKACCOUNT as BANKACCO9_1_1_,
 this_.BANKCODE as BANKCODE1_1_,
 this_.BANKNAME as BANKNAME1_1_,
 this_.AREA1TEXT as AREA12_1_1_,
 this_.AREA2TEXT as AREA13_1_1_,
 this_.AREA3TEXT as AREA14_1_1_,
 this_.AREA4TEXT as AREA15_1_1_,
 this_.AREA5TEXT as AREA16_1_1_,
 this_.CH_UUID as CH17_1_1_,
 this_.REFTEXT1 as REFTEXT18_1_1_,
 this_.REFTEXT2 as REFTEXT19_1_1_,
 this_.REFTEXT3 as REFTEXT20_1_1_,
 branch1_.UUID as UUID0_0_,
 branch1_.NAME as NAME0_0_,
 branch1_.ILN as ILN0_0_,
 branch1_.BRANCHID as BRANCHID0_0_,
 branch1_.SHORTDESC as SHORTDESC0_0_,
 branch1_.LONGDESC as LONGDESC0_0_,
 branch1_.BAGSRECEIVED as BAGSRECE7_0_0_,
 branch1_.CUSTOMER_UUID as CUSTOMER8_0_0_
 from
 CUSTOMER this_,
 BRANCH branch1_
 where
 this_.UUID=branch1_.CUSTOMER_UUID
 and (
 branch1_.NAME like ?
RESULT:
Customername: Customer_A
Customername: Customer_F
Customername: Customer_D
Customername: Customer_R
Customername: Customer_S
TIME:
Hibernate: 1.343 sek
JDBC:
QUERY:
Select distinct c.* from Customer c, Branch b where b.id=b.Customer_id and b.name like '%Branch%'
// After getting the result of the query: Create a list of Customer-objects. Set all attributes of each Customer-object.
RESULT:
Customername: Customer_R
Customername: Customer_A
Customername: Customer_S
Customername: Customer_D
Customername: Customer_F
TIME:
JDBC: 0.125 sek
The Customer.hbm.xml (auto-generated in Eclipse with Middlegen)
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
 "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
 "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd" >
<hibernate-mapping>

<class
 name="hibernate.hibernate.Customer"
 table="CUSTOMER"
 lazy="false"
>
 <id
 name="uuid"
 type="java.lang.String"
 column="UUID"
 >
 <generator class="assigned" />
 </id>
 <property
 name="name"
 type="java.lang.String"
 column="NAME"
 length="100"
 />
 <property
 name="customerno"
 type="java.lang.Integer"
 column="CUSTOMERNO"
 length="5"
 />
 <property
 name="shortdesc"
 type="java.lang.String"
 column="SHORTDESC"
 length="50"
 />
 <property
 name="longdesc"
 type="java.lang.String"
 column="LONGDESC"
 length="100"
 />
 <property
 name="taxnumber"
 type="java.lang.String"
 column="TAXNUMBER"
 length="50"
 />
 <property
 name="salestaxid"
 type="java.lang.String"
 column="SALESTAXID"
 length="50"
 />
 <property
 name="accountholder"
 type="java.lang.String"
 column="ACCOUNTHOLDER"
 length="50"
 />
 <property
 name="bankaccount"
 type="java.lang.String"
 column="BANKACCOUNT"
 length="50"
 />
 <property
 name="bankcode"
 type="java.lang.String"
 column="BANKCODE"
 length="50"
 />
 <property
 name="bankname"
 type="java.lang.String"
 column="BANKNAME"
 length="50"
 />
 <property
 name="area1text"
 type="java.lang.String"
 column="AREA1TEXT"
 length="50"
 />
 <property
 name="area2text"
 type="java.lang.String"
 column="AREA2TEXT"
 length="50"
 />
 <property
 name="area3text"
 type="java.lang.String"
 column="AREA3TEXT"
 length="50"
 />
 <property
 name="area4text"
 type="java.lang.String"
 column="AREA4TEXT"
 length="50"
 />
 <property
 name="area5text"
 type="java.lang.String"
 column="AREA5TEXT"
 length="50"
 />
 <property
 name="chUuid"
 type="java.lang.String"
 column="CH_UUID"
 length="50"
 />
 <property
 name="reftext1"
 type="java.lang.String"
 column="REFTEXT1"
 length="50"
 />
 <property
 name="reftext2"
 type="java.lang.String"
 column="REFTEXT2"
 length="50"
 />
 <property
 name="reftext3"
 type="java.lang.String"
 column="REFTEXT3"
 length="50"
 />
 
 
 <set
 name="branches"
 lazy="true"
 inverse="true"
 cascade="all"
 >
 <key>
 <column name="CUSTOMER_UUID" />
 </key>
 <one-to-many
 class="hibernate.hibernate.Branch"
 />
 </set>
</class>
</hibernate-mapping>So, seems to me like Hibernate is also getting the data from the Branch-Table related to each Customer. Maybe this is the reason, why Hibernate is slower.
But as you can see in the mapping-File of the customer, I wanted Branches to be lazy loaded.
Do you have any ideas, why Hibernate is so much slower? Any hints for optimizing that code?
Do you have any further tricks to optimize Hibernate? Unfortunately I am not allowed to make changes at the database, so I cannot e.g. set indices for optimization.
However, I�m a Hibernate-Newbie. In fact, I just made this test and was very disappointed about its result, so I didn�t keep on working with Hibernate.
But maybe you can proof me, that Hibernate is a good choice. If so, do you have any good resources (links, books) that help working with Hibernate in connection with JBOSS, describe how to map n:m relationships, show how to work with large results and so forth?
Thanx for help,
egon

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<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">
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08.06.2009 10:30:46 com.sun.enterprise.appclient.MainWithModuleSupport <init>
WARNUNG: ACC003: Ausnahmefehler bei Anwendung.
javax.ejb.EJBException: nested exception is: java.rmi.ServerException: RemoteException occurred in server thread; nested exception is:
 java.rmi.RemoteException: Transaction aborted; nested exception is: javax.transaction.RollbackException: Transaktion für Zurücksetzung markiert.; nested exception is:
 javax.transaction.RollbackException: Transaktion für Zurücksetzung markiert.
java.rmi.ServerException: RemoteException occurred in server thread; nested exception is:
 java.rmi.RemoteException: Transaction aborted; nested exception is: javax.transaction.RollbackException: Transaktion für Zurücksetzung markiert.; nested exception is:
 javax.transaction.RollbackException: Transaktion für Zurücksetzung markiert.
 at com.sun.corba.ee.impl.javax.rmi.CORBA.Util.mapSystemException(Util.java:243)
 at com.sun.corba.ee.impl.presentation.rmi.StubInvocationHandlerImpl.privateInvoke(StubInvocationHandlerImpl.java:205)
 at com.sun.corba.ee.impl.presentation.rmi.StubInvocationHandlerImpl.invoke(StubInvocationHandlerImpl.java:152)
 at com.sun.corba.ee.impl.presentation.rmi.bcel.BCELStubBase.invoke(BCELStubBase.java:225)
 at ejb.__EntryRemote_Remote_DynamicStub.addCompany(ejb/__EntryRemote_Remote_DynamicStub.java)I spend half the night figuring out whats wrong, however I couldnt find any solution.
If you have any idea pls let me know
Best regards and happy coding
Taggert
Edited by: Taggert_77 on Jun 8, 2009 2:27 PM

Well I don't understand this. If Netbeans created a Stateless Session Bean as a facade then it works -and it is implemented as a CMP, not as a BMP as you suggested.
I defenitely will try you suggestion, just for curiosity and to learn the technology, however I dont have see why BMP will work and CMP won't.
I also don't see why a stateless bean can not be a CMP. As far as I read it should not matter. Also on the link you sent me, I can't see anything related to that.
Maybe you can help me answering these questions.
I hope the above lines don't sound harsh. I really appreciate your input.
Best regards
Taggert

[persistence] all work, but can't persist new entity bean

Hi,
I have a FacadeBean which is working fine ... I can contact the BD oracle for retrieving my entity beans, update an entity bean etc...
BUT... I can't create an entity bean :( I don't understand why!!!
With the same code, I can create, list, etc... on OC4J and JBoss but the create method won't work with WebLogic :|
Here is the error present in console:
<09-mars-2007 15 h 03 min 47 s CET> <Error> <EJB> <BEA-010026> <Exception occurr
ed during commit of transaction Name=[EJB be.starapic.test.ejb.MyEntityFacadeBea
n.create(be.starapic.test.ejb.MyEntity)],Xid=BEA1-007A82AF3A953057A4BD(30283302)
,Status=Rolled back. [Reason=weblogic.transaction.internal.AppSetRollbackOnlyExc
eption],numRepliesOwedMe=0,numRepliesOwedOthers=0,seconds since begin=1,seconds
left=30,XAServerResourceInfo[weblogic.jdbc.wrapper.JTSXAResourceImpl]=(ServerRes
ourceInfo[weblogic.jdbc.wrapper.JTSXAResourceImpl]=(state=rolledback,assigned=Ad
minServer),xar=weblogic.jdbc.wrapper.JTSXAResourceImpl@110563c,re-Registered = f
alse),SCInfo[base_domain+AdminServer]=(state=rolledback),properties=({weblogic.t
ransaction.name=[EJB be.starapic.test.ejb.MyEntityFacadeBean.create(be.starapic.
test.ejb.MyEntity)], weblogic.jdbc=t3://192.168.100.188:7001}),OwnerTransactionM
anager=ServerTM[ServerCoordinatorDescriptor=(CoordinatorURL=AdminServer+192.168.
100.188:7001+base_domain+t3+, XAResources={weblogic.jdbc.wrapper.JTSXAResourceIm
pl},NonXAResources={})],CoordinatorURL=AdminServer+192.168.100.188:7001+base_dom
ain+t3+): weblogic.transaction.RollbackException: Unknown reason
at weblogic.transaction.internal.TransactionImpl.throwRollbackException(
TransactionImpl.java:1808)
at weblogic.transaction.internal.ServerTransactionImpl.internalCommit(Se
rverTransactionImpl.java:333)
at weblogic.transaction.internal.ServerTransactionImpl.commit(ServerTran
sactionImpl.java:227)
at weblogic.ejb.container.internal.BaseRemoteObject.postInvoke1(BaseRemo
teObject.java:606)
at weblogic.ejb.container.internal.BaseRemoteObject.postInvokeTxRetry(Ba
seRemoteObject.java:426)
at weblogic.ejb.container.internal.StatefulRemoteObject.postInvokeTxRetr
y(StatefulRemoteObject.java:100)
at be.starapic.test.ejb.myentityfacade_opn58i_MyEntityFacadeRemoteImpl.c
reate(myentityfacade_opn58i_MyEntityFacadeRemoteImpl.java:158)
at be.starapic.test.ejb.myentityfacade_opn58i_MyEntityFacadeRemoteImpl_C
BV.create(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at weblogic.ejb.container.internal.RemoteBusinessIntfProxy.invoke(Remote
BusinessIntfProxy.java:42)
at $Proxy152.create(Unknown Source)
at be.starapic.test.web.HelloServlet.doGet(HelloServlet.java:88)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run
(StubSecurityHelper.java:226)
at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecuri
tyHelper.java:124)
at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.jav
a:283)
at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.jav
a:175)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationActio
n.run(WebAppServletContext.java:3334)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(Authenticate
dSubject.java:321)
at weblogic.security.service.SecurityManager.runAs(Unknown Source)
at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppS
ervletContext.java:2081)
at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletC
ontext.java:1987)
at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.j
ava:1359)
at weblogic.work.ExecuteThread.execute(ExecuteThread.java:200)
at weblogic.work.ExecuteThread.run(ExecuteThread.java:172)
.>
<09-mars-2007 15 h 03 min 47 s CET> <Error> <HTTP> <BEA-101020> <[weblogic.servl
et.internal.WebAppServletContext@144a314 - appName: 'testDeploy', name: '/testDe
ploy', context-path: '/testDeploy'] Servlet failed with Exception
javax.ejb.EJBException: nested exception is: weblogic.transaction.internal.AppSe
tRollbackOnlyException
at weblogic.ejb.container.internal.RemoteBusinessIntfProxy.invoke(Remote
BusinessIntfProxy.java:57)
at $Proxy152.create(Unknown Source)
at be.starapic.test.web.HelloServlet.doGet(HelloServlet.java:88)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
Truncated. see log file for complete stacktrace
That say nothing good...
at $Proxy152.create(Unknown Source) is the problem I think but why ...?
Here is the entity bean:
@Entity
@Table(name="table_myentity")
public class MyEntity implements Serializable
private static final long serialVersionUID = -5806278646729410835L;
private int id;
private String name;
private int number;
public void setName(String name) {
this.name = name;
public String getName() {
return name;
public void setNumber(int number) {
this.number = number;
@Column(name="mynumber")
public int getNumber() {
return number;
public void setId(int id) {
this.id = id;
@Id
@GeneratedValue(strategy=GenerationType.AUTO)
public int getId() {
return id;
May be a problem of auto-generate for the ID...
Here is the facade bean:
@Stateful(name="myentityfacade", mappedName="myentityfacade")
@Remote(MyEntityFacadeRemote.class)
@Local(MyEntityFacadeLocal.class)
public class MyEntityFacadeBean implements MyEntityFacadeRemote, MyEntityFacadeLocal {
@PersistenceContext
private EntityManager em;
public MyEntity create(MyEntity meb) {
em.persist(meb);
return meb;
public void update(MyEntity meb) throws IllegalAccessException {
if (null == em.find(MyEntity.class, meb.getId())) {
throw new IllegalAccessException("Attempt to update a non existing entity");
em.merge(meb);
public void delete(int id) {
MyEntity meb = em.find(MyEntity.class, id);
em.remove(meb);
public void delete(MyEntity meb) {
meb = em.merge(meb);
em.remove(meb);
public MyEntity findById(int id) {
return em.find(MyEntity.class, id);
public List<MyEntity> listAll() {
return em.createQuery("SELECT o FROM MyEntity AS o").getResultList(); //TOPLINK, HIBERNATE
public List<MyEntity> listFiltered(String filter) {
return em.createQuery("SELECT o FROM MyEntity AS o "+filter).getResultList(); //TOPLINK, HIBERNATE
public int getNbMyEntityBean() {
return this.listAll().size();
Sorry for the long post... And finnaly here is the code present in the servlet:
// CREATE
MyEntity meb1 = new MyEntity();
meb1.setName("bbb");
meb1.setNumber(2);
meb1 = remoteMyEntityFacade.create(meb1);
Note that the remoteMyEntityFacade is working, because I can call any other buisness method without crashing the application.. Just the create can't work and so, persistence can't be used :(
Any suggestions ?

There is a problem with generated key
that code won't work:
@Id
@GeneratedValue(strategy=GenerationType.AUTO)
public int getId() {
return id;
But, if I remove line "GeneratedValue", it can insert into the BD, once only :s
The ID is set to 0 by default, so I can't add more than one entity :s

How to specify JDBC Oracle url using deployment tool - Entity Bean

Hello I'am new to EJB.
When creating a entity bean-managed persistence and you need to specify the jdbc url with user name
and password to establish a connection object, how does one specify that in the deployment
tool?
Heres an example of what has in the J2EE tutorial has in AccountEJB to get an connection object
private String dbName = "java:comp/env/jdbc/AccountDB";
private void makeConnection() throws NamingException, SQLException {
InitialContext ic = new InitialContext();
DataSource ds = (DataSource) ic.lookup(dbName);
con = ds.getConnection();
Now if my oracle jdbc url is to be jdbc:oracle:thin:@Abe:1521:dev
ie My host is Abe, port number 1521 and database name of dev and username/password will be system/manager.
what would my dbName be at the top?
Would my JNDI lookup of a DataSource resource "java:comp/env/jdbc/AccountDB" become "java:comp/env/jdbc/dev" for starters?
In the Resource Factories Reference Code I've add a reference of
Coded Name: jdbc/dev
Type: javax.sql.DataSource
Authentication: Container
and down the bottom of the I've put JNDI Name: MyAccount
according to the AccountClient code of:
Context initial = new InitialContext();
Object objref = initial.lookup("MyAccount");
and put User Name of "system" and Password of "manager"
I'am sure in the source code I have to put
Class.forName("oracle.jdbc.driver.OracleDriver")
else you would get that no sutitable driver error, maybe you don't have to if ejb server is smart enough?
What I'am confuse about is where to specify the jdbc url of "jdbc:oracle:thin:@Abe:1521:dev" ??
Know it won't work because of this vital part. Do you have to put that somewhere else in the deployment tool or properties file, or some other tool??
Please help
Thanks
Abraham Khalil

When running the client after successful deployment with jdbc, I'am getting
javax.naming.CommunicationException: java.rmi.MarshalException: CORBA MARSHAL 1398079699 Maybe; nested exception is:
org.omg.CORBA.MARSHAL: Unable to read value from underlying bridge : minor code: 1398079699 completed: Maybe
org.omg.CORBA.MARSHAL: Unable to read value from underlying bridge : minor code: 1398079699 completed: Maybe
at com.sun.corba.ee.internal.iiop.CDRInputStream_1_0.read_value(CDRInputStream_1_0.java:923)
at com.sun.corba.ee.internal.iiop.CDRInputStream.read_value(CDRInputStream.java:281)
at com.sun.corba.ee.internal.corba.TCUtility.unmarshalIn(TCUtility.java:274)
at com.sun.corba.ee.internal.corba.AnyImpl.read_value(AnyImpl.java:554)
at com.sun.corba.ee.internal.iiop.CDRInputStream_1_0.read_any(CDRInputStream_1_0.java:605)
at com.sun.corba.ee.internal.iiop.CDRInputStream.read_any(CDRInputStream.java:252)
at com.sun.corba.ee.internal.javax.rmi.CORBA.Util.readAny(Util.java:203)
at javax.rmi.CORBA.Util.readAny(Unknown Source)
at org.omg.stub.com.sun.enterprise.naming._SerialContextProvider_Stub.lookup(Unknown Source)
at com.sun.enterprise.naming.SerialContext.lookup(SerialContext.java:133)
at javax.naming.InitialContext.lookup(Unknown Source)
at AccountClient.main(AccountClient.java:21)
at com.sun.enterprise.naming.SerialContext.lookup(SerialContext.java:151)
at javax.naming.InitialContext.lookup(Unknown Source)
at AccountClient.main(AccountClient.java:21)
One thing I don't like about EJB is that everything is transparent which is good! But its much
harder to debug! :( Tried to see if I can figure it out. Hope someone has seen this problem before?

EJB Entity beans ,JDBC Stored procedures

Hi ,
I am new to EJB and i have some general questions
---Every table in an existing database is an entity bean for my application?
--- how do i define the queries in the entity bean ? (With PreparedStatement ?)
---The persistent fields,the ejbmethods,constructors, the table relationships, the prepared statements and stored procedures, are defined in the entity beans ?
--- how do i define the primary Keys in an Entity Bean !!! I will use EJB 2.1 and BMP
thanks in advance ...

Sandeep...
I have dblinks going all over the place. What you are talking about is a clustered or distributed database. That is the future (or present ) of large databases. My code is set up because an 'architecture' is not yet available in the database itself to support the concepts I've posted to Steve in other threads.
I fully believe that we'll eventually have BC4J ( or something like it ) directly in the database. I fully believe that the database will load balance these across a cluster of databases, within the database structure itself. For example... there is NOTHING to stop the JVM from deciding that it needs to load balance and submit the thread to a remote machine for processing... independent of creating a "middle tier" outside the database.
I believed that client-server model was flawed for most (not all) applications in the 80's. Looking at the "application tier" model I have the same feeling that we're creating an overly complex scheme at the wrong layer... just pushed back one stage so that we have to rewrite everything...
If you go back to the megalithic server design ( or cluster of servers ) with a thin thin front end... just why is the middle tier needed under the scenario I've outlined?
As such, stored procedures/triggers be they in java or pl/sql seems best bet to me... seeing's how a call spec to java or a pl/sql wrapper is transparent to the caller using jdbc or any other future technology.
grin Way outside the scope of the universe today... I see it as inevitable.
null

JDBC or Entity Beans for Read-Only Data?

Entity beans are way to slow on pulling the amount of data I need. What are the cons of just using JDBC? Is this bad programming?
One query pulls about 700 rows from 6 different tables taking up to 20 seconds. The same call using JDBC takes 2 seconds. What is the proper thing to do?

One query pulls about 700 rows from 6 different
tables taking up to 20 seconds. The same call using
JDBC takes 2 seconds. What is the proper thing to do?JDBC. Entity beans are not really suited for data across multiple tables. This can be best done with plain SQL +JDBC.

JDBC issue when accessing an Entity Bean

Hi,
WLCS 3.1
WLS 5.1 sp6
Windows NT
Oracle 8.1.6
I am having problems with an Entity bean, I have originaly deployed and had it
running on cloudscape. I decided I need to deploy it to Oracle 8.1.6, on startup
of WLCS the bean was deployed to the connection pool correctly using Weblogic
JDriver.
The bit I cannot understand is when I try and do a FindByPrimaryKey on the Entity
Bean the following exception is thrown by oracle, which leads me to believe this
must be an Oracle/Jdbc problem.
Here you can see that the bean has been deployed on a valid connection pool.
Tue Sep 18 15:47:39 GMT+03:00 2001: <EJB JAR deployment /export/home/mccann/tester2.jar>
EJB home interface: 'com.testerHome' deployed bound to the JNDI name
: 'tester'
Heres the exception raised when a findByPrimaryKey is invoked on the bean....
Tue Sep 18 15:47:57 GMT+03:00 2001: <EJB JAR deployment /export/home/mccann/t
ester2.jar> Exception in non-transactional EJB invoke:
java.sql.SQLException: ORA-00942: table or view does not exist
at weblogic.db.oci.OciCursor.getCDAException(OciCursor.java:228)
at weblogic.jdbcbase.oci.Statement.executeUpdate(Statement.java:869)
at weblogic.jdbc.pool.PreparedStatement.executeUpdate(PreparedStatement.
java:65)
at com.testerEJBPSWebLogic_CMP_RDBMS.create(testerEJBPSWebLogic_CMP_RDBM
S.java:199)
at com.testerEJBPSWebLogic_CMP_RDBMS.create(testerEJBPSWebLogic_CMP_RDBM
S.java:162)
at weblogic.ejb.internal.EntityEJBContext.create(EntityEJBContext.java:1
18)
at weblogic.ejb.internal.StatefulEJBObject.postCreate(StatefulEJBObject.
java:268)
at com.testerEJBEOImpl.create(testerEJBEOImpl.java:61)
at com.testerEJBHomeImpl.create(testerEJBHomeImpl.java:32)
at com.testerEJBHomeImpl_WLSkel.invoke(testerEJBHomeImpl_WLSkel.java:68)
at weblogic.rmi.extensions.BasicServerObjectAdapter.invoke(BasicServerOb
jectAdapter.java:347)
at weblogic.rmi.extensions.BasicRequestHandler.handleRequest(BasicReques
tHandler.java:69)
at weblogic.rmi.internal.BasicExecuteRequest.execute(BasicExecuteRequest
.java:15)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:135)
Any help here would be great, this is annoying problem because the Entity bean
deploys fine and no issues are raised at startup time, so the table must of existed
and the structure must of been correct. But minutes after the server started I
ran my client which tried to invoke this bean with the above exception.
Thanks
Wayne.

Hi Wayne,
I'd recommend you installing of latest SP for WL plus installing of Oracle
8.1.7 thing driver.
Regards,
Slava Imeshev
"Wayne Highland" <[email protected]> wrote in message
news:[email protected]...
>
Hi,
WLCS 3.1
WLS 5.1 sp6
Windows NT
Oracle 8.1.6
I am having problems with an Entity bean, I have originaly deployed andhad it
running on cloudscape. I decided I need to deploy it to Oracle 8.1.6, onstartup
of WLCS the bean was deployed to the connection pool correctly usingWeblogic
JDriver.
The bit I cannot understand is when I try and do a FindByPrimaryKey on theEntity
Bean the following exception is thrown by oracle, which leads me tobelieve this
must be an Oracle/Jdbc problem.
Here you can see that the bean has been deployed on a valid connectionpool.
>
Tue Sep 18 15:47:39 GMT+03:00 2001: <EJB JAR deployment/export/home/mccann/tester2.jar>
EJB home interface: 'com.testerHome' deployed bound to the JNDI name
: 'tester'
Heres the exception raised when a findByPrimaryKey is invoked on thebean....
>
Tue Sep 18 15:47:57 GMT+03:00 2001: <EJB JAR deployment/export/home/mccann/t
ester2.jar> Exception in non-transactional EJB invoke:
java.sql.SQLException: ORA-00942: table or view does not exist
at weblogic.db.oci.OciCursor.getCDAException(OciCursor.java:228)
atweblogic.jdbcbase.oci.Statement.executeUpdate(Statement.java:869)
atweblogic.jdbc.pool.PreparedStatement.executeUpdate(PreparedStatement.
java:65)
atcom.testerEJBPSWebLogic_CMP_RDBMS.create(testerEJBPSWebLogic_CMP_RDBM
S.java:199)
atcom.testerEJBPSWebLogic_CMP_RDBMS.create(testerEJBPSWebLogic_CMP_RDBM
S.java:162)
atweblogic.ejb.internal.EntityEJBContext.create(EntityEJBContext.java:1
18)
atweblogic.ejb.internal.StatefulEJBObject.postCreate(StatefulEJBObject.
java:268)
at com.testerEJBEOImpl.create(testerEJBEOImpl.java:61)
at com.testerEJBHomeImpl.create(testerEJBHomeImpl.java:32)
atcom.testerEJBHomeImpl_WLSkel.invoke(testerEJBHomeImpl_WLSkel.java:68)
atweblogic.rmi.extensions.BasicServerObjectAdapter.invoke(BasicServerOb
jectAdapter.java:347)
atweblogic.rmi.extensions.BasicRequestHandler.handleRequest(BasicReques
tHandler.java:69)
atweblogic.rmi.internal.BasicExecuteRequest.execute(BasicExecuteRequest
java:15)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:135)
Any help here would be great, this is annoying problem because the Entitybean
deploys fine and no issues are raised at startup time, so the table mustof existed
and the structure must of been correct. But minutes after the serverstarted I
ran my client which tried to invoke this bean with the above exception.
Thanks
Wayne.

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