Does an entity bean update result in ALL DB columns being updated?

Hello,
If I update a single field in my entity bean, will all the columns for the DB row be updated? -OR will only the changed column value be updated?
Thank,
Keith

Only fields detected as persistent-dirty will be updated in the database record.
Laurent

Similar Messages

CMP entity bean update after database update

I'm new to JDeveloper and J2EE. Since JDev 10.1.3 is now production software I finally got started with it. Everything was quite simple to achieve however I have one problem.
My current setup is faily easy. I have a statelss session bean and a CMP entity bean using TopLink (both EJB 2.1). Getting them both created went smooth and having the two talk was as easy as pie thanks to Jdev.
The problem I have is with the entity bean. I'm using a custom finder method to retrieve records using non-PK fields. This works like a charm and I'm getting the data I need. But when I update the data in the database (OracleXE) and I rerun the client I get the old data. The only way for me to get new data is to restart the embedded OC4J server in JDev.
How can I have the entity bean updated by changes in the database?

Thanks Avi!
I spent some time with the documentation and I see I can configure the cache. However how to do this is not clear to me. I have the impression that most of it relates to BMP entity beans.
Apparantly there is a DoNotCheckCache method I can invoke on the query, but I have no idea how to achieve this...
Message was edited by:
Deddiekoel

EJB3 entity bean update, best practice

I have an ejb3 entity bean that models a time that can be reserved in a booking system.
I need a way to reserve the time for a specific user. Ofcourse the reservation should not overwrite if the time has already been reserved by another user.
What is the best/cleaneste way to provide this service?
I have thought of the following ways.
I could put a version field on the entity. When the user is set in the frontend the entitybean will check that the time is not already reserved. If not it will be sent backup to the stateless session bean for persisting. If the time has been reserved by another user in the meantime JPA will throw an exception since the version doesn't match any more. The frontend can then show the error to the user.
I could make the frontend call a method in a stateless session bean to reserve the time. The function could take the times primary id and the users primary id and loaded them from persistence. Then check if the time is already reserver else set the user and persist the time again. This should ofcourse be within a transaction and possibly also use a version attribute on the entity.

Only fields detected as persistent-dirty will be updated in the database record.
Laurent

Will updates to an EJB3 entity bean update ONLY changed columns?

Hello,
If you have an EJB3 entity bean that maps to a table, and then you change the value of ONE of the fields in the entity bean, will each column in the row be updated, OR just the column that changed in the row?
Thanks

Only fields detected as persistent-dirty will be updated in the database record.
Laurent

[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

Use direct JDBC with CMP entity bean in one transaction

I am trying to use direct JDBC call with CMP entity bean within a session
bean method that requires transaction. The problem is that it appears these
are not in the same transaction. When I use the JDBC call, the CMP entity
bean update to the DB has not been committed yet.
We are using Weblogic 5.1 SP6. The DB is Oracle.
What I do for the JDBC is get a new connection from the pool using weblogic
jdbc pool driver.
Any help would be appreciated.
Patrick

Hi. You can do JDBC and invoke CMP EJBs and have this all treated
as one transaction, if your hand-written code explicitly starts
a JTS transaction, then uses the jts driver or a TxDataSource to
get the JDBC connection. Then your code can call transactional
EJBs and their work will be included in the transaction you started.
Assuming the bean work went OK, and your manual JDBC went OK, you
can manually commit the UserTransaction at that time. This is 5.1
talk. For 6.0, with @PC, this may be even easier...
Joe
Patrick Shen wrote:
>
But if I do that, then they would not be in the same transaction anymore.
Is there any way to use JDBC with CMP Entity bean in the same transaction?
Patrick
"L'artiste" <[email protected]> wrote in message
news:[email protected]...
Are you calling all the CMP create in the session Bean ? If so, beforeyou
make the JDBC call from the session bean, the CMP in 2. should commit. Try
to set its attribute to TX_REQUIRES_NEW. This way, the calling client will
block until this transaction is done (committed) before the execution
continues. There might be some overhead involved in doing so if you are
anticipating a lot of users.
"Patrick Shen" <[email protected]> wrote in message
news:[email protected]...
What I am trying to do is:
In a Session bean method -
1. create a new CMP entity bean (a new row in DB table)
2. create another new CMP entity bean that uses previous bean as foreignkey
3. use JDBC to update the row just created
And all these 3 calls have to be in one transaction.
Thanks,
Patrick
"L'artiste" <[email protected]> wrote in message
news:[email protected]...
Can you give a little bit more information?
Do you have methods in your session bean that creates this CMP entitybeans?
It looks like
you might wanna try to change the isolation level to
TRANSACTION_READ_COMITTED
to preven dirty_read.
"Patrick Shen" <[email protected]> wrote in message
news:[email protected]...
I am trying to use direct JDBC call with CMP entity bean within a
session
bean method that requires transaction. The problem is that it
appears
these
are not in the same transaction. When I use the JDBC call, the CMP
entity
bean update to the DB has not been committed yet.
We are using Weblogic 5.1 SP6. The DB is Oracle.
What I do for the JDBC is get a new connection from the pool usingweblogic
jdbc pool driver.
Any help would be appreciated.
Patrick
PS: Folks: BEA WebLogic is expanding rapidly, with both entry and advanced positions
for people who want to work with Java, XML, SOAP and E-Commerce infrastructure products.
We have jobs at Nashua NH, Liberty Corner NJ, San Francisco and San Jose CA.
Send resumes to [email protected]

Proxy object and entity Bean interaction

Hello,
I'd like to have some precisions on the interactions between the proxy object (client) and the entity bean(server):
- does J2EE provides ways for a bean to manage clients, to define roles and permissions, lock, etc ... ? What informations an entity bean can know about the clients ?.
- how does the context mechanism work on the entity bean side ?
- how does an entity bean identify different clients ? how does it recognize one from another ? I mean if client c1 and client c2 use same entity bean B, how B can manage different roles for c1 and c2, and how can B returns specific values to a particular client.
Thx.

If you can read some tutorial, you will get all the information.
I'll suggest a book EJB by richard manson publicvations oreilly.
The activities you are talking about is responsibility of container and user developed bean are totally absytracted from this system level activities.
Primary service include security which take care of activities like Authentication, access control and secure communication.
for role based access control u have container providing the identity by Principal object. DDescriptors declare which logical roles are allowed to access even perticular method of the bean.

Creating jar file for entity bean

I am trying to deploy an entity bean..i compiled all the java files and created a dir by name META_INF and copied ejb-jar.xml
and the other two .xml files which are needed to this dir. then using ,ant i tried to create the jar file ,,but it is giving the following error
during the process ..PLs Help me
Buildfile: build.xml
clean:
[delete] Deleting directory D:\ejb\entity\build
[delete] Deleting directory D:\ejb\entity\dist
init:
[mkdir] Created dir: D:\ejb\entity\build
[mkdir] Created dir: D:\ejb\entity\build\META-INF
[mkdir] Created dir: D:\ejb\entity\dist
compile_ejb:
[javac] Compiling 3 source files to D:\ejb\entity\build
jar_ejb:
[jar] Building jar: D:\ejb\entity\dist\Cabin.jar
ejbc:
[java] java.io.FileNotFoundException: META-INF/ejb-jar.xml not found in jar file
[java]      at weblogic.ejb20.dd.xml.DDUtils.getEntry(DDUtils.java:332)
[java]      at weblogic.ejb20.dd.xml.DDUtils.getEjbJarXml(DDUtils.java:236)
[java]      at weblogic.ejb20.dd.xml.DDUtils.loadEJBJarDescriptorFromJarFile(DDUtils.java:151)
[java]      at weblogic.ejb20.dd.xml.DDUtils.createDescriptorFromJarFile(DDUtils.java:139)
[java]      at weblogic.ejb20.dd.xml.DDUtils.createDescriptorFromJarFile(DDUtils.java:130)
[java]      at weblogic.ejbc20.runBody(ejbc20.java:338)
[java]      at weblogic.utils.compiler.Tool.run(Tool.java:79)
[java]      at weblogic.ejbc.main(ejbc.java:21)
[java] ERROR: java.io.FileNotFoundException: META-INF/ejb-jar.xml not found in jar file
compile_webapp:
Total time: 20 second

The Ejb jar file structure for WebLogic server:
META-INF/ejb-jar.xml
META-INF/weblogic-ejb-jar.xml
META-INF/weblogic-cmp-rdbms-jar.xml
Ejb Bean Class
Remote interface
Home interface

Is there a better way of doing this? (regards Entity Beans, CMP, J2EE5...)

Hello everyone,
So I'm going to blurt out two classes of code. First is a plain entity bean and the second is a helper class with two static methods to help me to convert Object into byte[] and vice versa without much worrying.
Now the problem is, how to persist this entity bean and it's two Objects (two Lists) in a more "J2EE5 way". I just need to store these two Objects, or any Serializable Object, into persistent storage. So how to avoid this serialization by-hand that I'm doing... ?
Thank you for your interest - and help :),
Samuli
Maybe using a @Lob notation or such? I've tried, but I can't get it workign. @Lob itself is not enough since it results in casting problems when retrieveing the data back from the persistent storage.
And oh, I'm just using the simple CMP with this.. EJB using EntityManager's persist method to store and so on..
EntityBean class (imports and packages excluded)
@Entity
public class MessageHandlerChain implements java.io.Serializable {
    @TableGenerator(
        name="messageHandlerChainIDGenerator",
        allocationSize=1,
        initialValue=1
    @GeneratedValue(
        generator="messageHandlerChainIDGenerator",
        strategy=GenerationType.TABLE
    @Id
    private Integer messageHandlerChainID;
    @Lob
    private byte[] messageHandlers;
    @Lob
    private byte[] messageHandlerProperties;
    @Transient
    private List<String> messageHandlersObj = new ArrayList<String>();
    @Transient
    private List<Map<String,String>> messageHandlerPropertiesObj = new ArrayList<Map<String,String>>();
     * Constructs an empty instance of <code>MessageHandlerChain</code> without any properties.
    public MessageHandlerChain() {
    public Integer getMessageHandlerChainID() {
        return messageHandlerChainID;
    public void setMessageHandlerChainID(Integer messageHandlerChainID) {
        this.messageHandlerChainID = messageHandlerChainID;
    public List<String> getMessageHandlers() {
        return messageHandlersObj;
    public void setMessageHandlers(List<String> messageHandlersObj) {
        if (messageHandlersObj == null) {
            System.out.println("[MessageHandlerChain] setMessageHandlers() can't be given a null value.");
            return;
        this.messageHandlersObj = messageHandlersObj;
    public List<Map<String,String>> getMessageHandlerProperties() {
        return messageHandlerPropertiesObj;
    public void setMessageHandlerProperties(List<Map<String,String>> messageHandlerPropertiesObj) {
        if (messageHandlerPropertiesObj == null) {
            System.out.println("[MessageHandlerChain] setMessageHandlerProperties() can't be given a null value.");
            return;
        this.messageHandlerPropertiesObj = messageHandlerPropertiesObj;
    @PrePersist
     * This method is invoked by the persistence provider prior to every persist operation.
     * This is needed because we need to convert, serialize, our <code>@Transient</code> annotated objects into <code>byte[]</code> streams
     * so that they can be written into the database.
    public void prePersist() {
        System.out.println("[MessageHandlerChain] prePersist()");
        if (messageHandlerPropertiesObj != null)
            messageHandlerProperties = BlobConverter.objectToBytes(messageHandlerPropertiesObj);
        if (messageHandlersObj != null)
            messageHandlers = BlobConverter.objectToBytes(messageHandlersObj);
    @PostLoad
     * This method is invoked by the persistence provider after every load operation.
     * This is needed because we need to convert, deserialize, <code>byte[]</code> streams back to our <code>@Transient</code> annotated objects.
    public void postLoad() {
        System.out.println("[MessageHandlerChain] postLoad()");
        try {
            if (messageHandlerProperties != null)
                messageHandlerPropertiesObj = (List<Map<String,String>>)BlobConverter.bytesToObject(messageHandlerProperties);
            if (messageHandlers != null)
                messageHandlersObj = (List<String>)BlobConverter.bytesToObject(messageHandlers);
        } catch (ClassCastException e) {
            System.out.println("[MessageHandlerChain] postLoad() Class Cast Exception: "+e);
    public String toString() {
        return "[MessageHandlerChain] messageHandlerChainID="+getMessageHandlerChainID()+", messageHandlers="+getMessageHandlers()+", messageHandlerProperties="+getMessageHandlerProperties();
The helper class
* <code>BlobConverter</code> is a simple helper class to encode and decode classes as byte[] so that they can be stored into persistent storage.
* @author Samuli Piela
public class BlobConverter {
    public static byte[] objectToBytes(Object o) {
        ByteArrayOutputStream baos = new ByteArrayOutputStream(512);
        ObjectOutputStream oos = null;
        try {
            oos = new ObjectOutputStream(baos);
            oos.writeObject(o);
            return baos.toByteArray();
        } catch (InvalidClassException e) {
            System.out.println("objectToBytes("+o+"): Invalid Class: "+e);
        } catch (NotSerializableException e) {
            System.out.println("objectToByte("+o+"): Object not serializable: "+e);
        } catch (Exception e) {
            System.out.println("objectToBytes("+o+"): Exception: "+e);
        } finally {
            if (oos != null) {
                try {
                    oos.close();
                } catch (IOException e) {
                    System.out.println("objectToBytes(): Stream could not be closed: "+e);
            if (baos != null) {
                try {
                    baos.close();
                } catch (IOException e) {
                    System.out.println("objectToBytes(): Stream could not be closed: "+e);
            oos = null;
            baos = null;
        return null;
    public static Object bytesToObject(byte[] byteArray) {
        ByteArrayInputStream bais = new ByteArrayInputStream(byteArray);
        ObjectInputStream ois = null;
        try {
            ois = new ObjectInputStream(bais);
            Object o = ois.readObject();
            return o;
        } catch (ClassNotFoundException e) {
            System.out.println("bytesToObject(): Class not found: "+e);
        } catch (InvalidClassException e) {
            System.out.println("bytesToObject(): Invalid Class: "+e);
        } catch (IOException e) {
            System.out.println("bytesToObject(): IOException: "+e);
        } catch (Exception e) {
            System.out.println("bytesToObject(): Exception: "+e);
        } finally {
            if (ois != null) {
                try {
                    ois.close();
                } catch (IOException e) {
                    System.out.println("bytesToObject(): Stream could not be closed: "+e);
            if (bais != null) {
                try {
                    bais.close();
                } catch (IOException e) {
                    System.out.println("bytesToObject(): Stream could not be closed: "+e);
            ois = null;
            bais = null;
        return null;
}

anyone?

Can't Update with CMP entity bean (psi-ri)

Hello!
Has anybody got entitybeans to work thorougly with psi-ri -persistence provider?
Our entities Insert and Delete as they should be, but we haven't got them to Update anything.
I have a feeling that this has something to do with transactions, but I haven't found any answers yet.
All help is more than appreciated
Petri Valto
null

yes, Entity beans with psi-ri works fine. In fact I have written a couple of them which is fine.

Wrong version of an entity bean object being updated

We are having a problem with an entity bean that uses bean managed persistence. The "order" entity bean has
been used as part of our Order Routing System for the last 2 years with no problems. The entity bean is
accessed via calls from a "Order Manager" session bean. No change has been done to the entity bean but the
frequency of calls from the session bean to update the entity bean have increased significantly.
The "order" entity bean wraps an Order object that contains order properties (i.e. id, quantity, price,
version, etc). The entity bean has a "void setOrder(Order param)" function that writes the Order to a database
and a "Order getOrder()" function that clones and returns the internal Order object. The "ejbLoad()" function
reads the Order object from the database and the "ejbStore()" function is not implemented.
The "OrderEntityPK ejbFindByPrimaryKey()" function checks if the order entity primary key (an "int") exists
on the database.
We are using the SilverStream 3.5 application server as our EJB container. According to the SilverStream manual
it does not maintain a pool of idle/unused entity beans, instead it instantiates beans as requested.
Our problem is:
1) The wrong version of the entity object is sometimes being updated (i.e. an old instance of the order entity is being
picked up and updated on the database).
2) We sometimes get a TransactionRequired exception thrown when we have concurrent updates to two different
objects of the entity bean.
Any idea as to what our problem could be?
Thanks in advance for your help,
The following are the main code snippets:
Original Code
Session Bean A
Method 1 --- gets entity Bean B and calls a method on a different object passing this entity bean
          in as a parameter to enable a method on this bean to be called.
EntityBean lOrderEntity = findOrderEntity(callerUnixLogin, currOrderId);
               currOrder = lOrderEntity.getOrder();
               //Logic to update the currOrder object via a method call.
               persistManager.persistOrder(lOrderEntity, callerUnixLogin, currOrder, psTransactionType);
     persistManager.persistOrder Method:
               lOrderEntity.setOrder(callerUnixLogin, order);
     findOrderEntity method:
OrderEntity lOrderEntity = null;
          OrderEntityBeanPK orderPK = new OrderEntityBeanPK(orderId);
          try
               if (orderEntityHome == null)
                    connectToOrderEntityBean(callerUnixLogin);
               lOrderEntity = orderEntityHome.findByPrimaryKey(orderPK);
          ... etc
Current Code
Session Bean C
Method 2 ---- calls method 1 in Session Bean A
Calls to method 2 above happens in quick succession.
OrderEntityBean class
... important methods ...
     private Order order = null;
     public OrderEntityBeanPK ejbFindByPrimaryKey(OrderEntityBeanPK primaryKey)
          throws FinderException, RemoteException, DBOException
          try
               orderObjectManager.orderIdExists(primaryKey.orderId);
          catch (OMOrderValidationException exc)
               throw new FinderException(exc.getMessage());
          return primaryKey;
     public void setOrder(String userUnixLogin, Order newOrder)
          throws EJBException, RemoteException, DBOException, OMFormattingException, OMOrderValidationException
          callerUnixLogin = userUnixLogin;
          int version = newOrder.getOrderVersion().intValue();
          if (order.getOrderVersion().intValue() == version)
               order = null;
               order = newOrder;
               Integer newVersion = new Integer(version + 1);
               order.setOrderVersion(newVersion);
               newVersion = null;
               order.setSysUser(callerUnixLogin);
               orderObjectManager.updateOrder(callerUnixLogin, order);
          else
               Debug.Print(userUnixLogin, "OrderEntityBean.setOrder: wrong version number for order " + newOrder.getOrdId() +
                    ": expected " + order.getOrderVersion() + " and got " + newOrder.getOrderVersion(), 0);
               throw new OMOrderValidationException("wrongVersion", order, order.getOrdId(), IName.Order.VERSION, newOrder.getOrderVersion());
     public Order getOrder()
          throws EJBException, RemoteException
return ((Order)order.clone());
The following transactions exists for the entity bean ...
Required:
     create and setOrder methods
Not Supported
     findByPrimary and getOrder methods

"The entity bean has a "void setOrder(Order param)" function that writes the Order to a database"
This functionality should be performed in the ejbStore method().
"a "Order getOrder()" function that clones and returns the internal Order object."
Sounds reasonable, except for the cloning part.
"The "ejbLoad()" function reads the Order object from the database"
Cool.
""ejbStore()" function is not implemented."
Whoops. Looks like your setOrder method is doing too much. It should do the inverse of getOrder (namely, setting the interal Order object), nothing more. Defer the persistence code to the ejbStore method.
"According to the SilverStream manual it does not maintain a pool of idle/unused entity beans, instead it instantiates beans as requested."
Manual? What's that? Assuming that is correct, better hope you don't ever get a high load. You might wanna look into JBoss.
"2) We sometimes get a TransactionRequired exception thrown when we have concurrent updates to two different objects of the entity bean."
How can you have concurrent access to two different objects?? Concurrency is inherently applicable to only one object.
In summary:
Write your beans properly, ejbLoad populates the bean with data, ejbStore persists the bean's data.
Get a better (and possibly free) appserver.

Updating Entity Bean (URGENT)

Hello,
I have an entity bean created in my jdeveloper based on a table in my database, I have added two colomns to my table how do I make my entity synchronize(update) with the database table and generate GET and SET methods for the(new colomns)in the altered table.
regards,
Hussam Galal

EJB spec does not allow update of the primary key. Any other update should be fine.
Regards,
Marina

HT204135 I update my Mac to version 10.9.2 and now my printer does not work anymore. I did all the software updates and I do not understand why my mac does not recognize the printer anymore?

I update my Mac to version 10.9.2 and now my printer does not work anymore. I did all the software updates and I do not understand why my mac does not recognize the printer anymore?

Go to the website of the manufacturer of your printer and check to see if they have released an updated driver for your particular model.

I DON'T WANT TO UPGRADE OR HAVE AN ADD ON EVER, DISABLING UPDATES DOES NOT WORK, HOW DO I KILL ALL MEASAGES FOR UP GRADES AND ADD ON'S FOR EVER, ONCE AND FOR ALL, COMPLETELY, THE END AND NEVER BE BOTHERED AGAIN EVER!

I DON'T WANT TO UPGRADE OR HAVE AN ADD ON EVER, DISABLING UPDATES DOES NOT WORK, HOW DO I KILL ALL MESSAGES FOR UP GRADES AND ADD ON'S FOR EVER, ONCE AND FOR ALL, COMPLETELY, THE END AND NEVER BE BOTHERED AGAIN EVER! ALSO IF I KILL MYSELF I WILL HOLD YOU PERSONALTY RESPONSIBLE.edit

There is a world of information in these forums if you use the search function near the top right of this page. Just type in NAS for example and you get many threads on the subject (marked with a green checkmark if it solved the question) another example would be Airport Exterme and sound system. Once you formulate your ideas better then specific questions can be addressed one at a time. You may find that a less expensive choice for a server might be a mac mini. Good luck with your project, ask more specific questions and update you systems profile.

HT201263 My ipad will not show the recovery mode, it goes into DFU mode just fine, but whenever I put it in recovery mode I get nothing but a blank white screen. After doing a restore or update itunes gives me error 37. This all happened due to a failed u

I updated from ios 5.0.1 to 5.1. Midway through the update itunes crashed. I got it all working again and ever since I have been stuck in a recovery loop. DFU mode works fine, but when I go into recovery mode (yes I am doing it right, yes I have tried pwning, tinyumbrella, etc.) it still just gives me a white screen (I am not getting the plug arrow and itunes icon screen that shows up when you are in recovery mode). I am a huge fan of hacking, mods, and jbs, BUT have never done any on the iPad, (found it pointless).. nevertheless, I am stuck thanks to apple in a white screen and a nonworking iPad. If anyone has any ideas that does not include jbs, updating, restoring, restoring with internet off, restoring in DFU, I would gladly appreciate it. I would take it to the apple store but it was a friends and I didn't purchase it. My friend had the issue formerly and they had no idea what to do at apple (they usually try DFU, restore, and then have nothing else to tell you.

There's a whole lot to read in your post, and frankly I have not read it all.
Having said that, this troubleshooting guide should help:
http://support.apple.com/kb/TS1538
In particular, pay attention to the mobile device support sections near the bottom, assuming you have already done the items above it.

Does an entity bean update result in ALL DB columns being updated?

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