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
Similar Messages
-
Updating entity bean requires lot of effort in Jdeveloper
Is there a simple way of updating entity bean when a table is modified in database?
I forgot the 13" had the internal battery. The battery could still be the problem though. Here is a guide to open the computer and check it.
http://macosg.me/2/go
Check out the new remodeled MacOSG website! 24-hour Apple-related news & support.
MacOSG: An Apple User Group iTunes: MacOSG Podcast Follow us on Twitter: MacOSG -
External Database Updates Automatically Updating Entity Beans
Hi,
I have a Java GUI which displays the contents of a table. One row is displayed on the GUI for each row in the table.
The data is accessed by the Java GUI from the table using a container Managed Entity Bean.
If I insert a row in the table from Oracle's SQL command prompt, can the GUI be automatically refreshed to display the new row that was inserted in the table i.e. does weblogic container receive any message which can be trapped by the entity bean to automatically reload the content of the table.
Regards,
Dinesh"Dinesh Mehta" <[email protected]> wrote in message
news:3bd5eba3$[email protected]..
Hi Dinesh,
I think there is a requirements/design problem here.
First, it's hardly possible to implement a callbacks
from the DB layer to a container layer.
Second, what would happend to the GUI if many
changes to the database ocure simultaneously?
I thinks this is a GUI user who has to request
a refresh when it's necessary.
Regards,
Slava Imeshev
I have a Java GUI which displays the contents of a table. One row isdisplayed on the GUI for each row in the table.
>
The data is accessed by the Java GUI from the table using a containerManaged Entity Bean.
>
If I insert a row in the table from Oracle's SQL command prompt, can theGUI be automatically refreshed to display the new row that was inserted in
the table i.e. does weblogic container receive any message which can be
trapped by the entity bean to automatically reload the content of the table. -
Urgent: Can't lookup entity bean
Dear all,
I define a business process in workflow engine, which invoke a java class to get
DB data through CMP entity bean. The entity bean was packed in to a ear and was
workable/callable within the same ear.
However, when the workflow engine can't invoke the entity bean, the workflow engine
always throw exception as following.
javax.naming.LinkException: . Root exception is javax.naming.NameNotFoundException:
Unable to resolve 'app/ejb/ConsignmentEntityBean.jar#Consignments/local-home'
Resolved: 'app/ejb' Unresolved:'ConsignmentEntityBean.jar#Consignments' ; remaining
name 'ConsignmentEntityBean.jar#Consignments/local-home'
I think the problem may occur in deployment/configuration. Since the problem is
very urgent, anyone can help me? To all developers, How do you package/deploy
Entity Bean in Integration Server?
Thx,
PhilipI solved this.
Since I was testing the action code only, I didn't define a navigation entry corresponding to the action string returned for this button:
<h:commandButton value="Add" style="height:21px; width:51px;font-size:8pt; font-color: black;" action="#{resourceBean.addAction}">
</h:commandButton>After I added a nav definition, it worked. I don't know why at this point. I suspect a key step in the lifecycle was pre-empted...someone else can probably explain why. If I get a chance to research it after I'm done with my project, I'll update this post.
Thanks.
-L -
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,
KeithOnly fields detected as persistent-dirty will be updated in the database record.
Laurent -
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 -
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
nullyes, Entity beans with psi-ri works fine. In fact I have written a couple of them which is fine.
-
Urgent!Poor performance in Entity beans
we're using Weblogic 5.1, Oracle 8i.(both installed in Solaris 5.8) We
found that the performance of our entity beans is poor, the reason we
guess is because when we issue a select statement, the jdbc, at the same
time, issue a update statement, that's why the response time is slow.
(By the way,we use oracle thin driver to connect.)
I know we can set autocommit to false but our beans are cmp,so we can't
set properties in connection pool.What can we do then?Can we set any
transaction attributes in our ejb,so we can solve our problem?
Thx!
PeteA few issues with the linked article:
" 1. Where ever possible, using Entity bean with CMP over Entity bean with BMP, will ensure increase in performance... Tuned CMP entity beans offer better performance than BMP entity beans."
Bull. Every time I have seen some statement like the above it has never contained any associated proof nor explaination of how a container vendor's code can interact with a DB any better than mine.
The only means by which a container vendor can generically improve the performance of DB interactivity is to not do it, namely by caching the data and monitoring modification. This is rarely used due to mitigating factors such as any case where the container does not have sole access and omniscience over the DB.
"Moving towards the CMP based approach provides database independence since it does not contain any database storage APIs within it."
Ahh yes, lets trade in EJB container independence for database independence. It's interesting that the biggest proponents of CMP (and the ones who pushed it into the spec) are the biggest container vendors. Database storage APIs??? Perhaps JDBC and "select * from USER where..." are somehow viewed as database specific. -
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. -
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?
ThanksOnly fields detected as persistent-dirty will be updated in the database record.
Laurent -
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 -
Urgent: Entity Bean question
Hi,
I am using an entity beans to store and load records in a table. When I save records to the table I store them in an order of Primary key ID, but when loading the entity bean this order is not being preserved. Is there any way I can specify what the order (ascending or descending) the entiry bean needs to load records?
Thanks.Dunno what exactly are you asking.
I mean how are u making bulk entity bean save records?
What exactly is the purpose ?
Cheers,
manjunath -
Urgent help needed session calling remote interface entity bean Method -P
i deployed session and entity as seperatly
i didn't get the home interface object of entity bean
give the soultion for the
as i deployed in same jar file means
its workingHi,
hopefully I can help you.
1. There are few helper classes which has to be ...We have just the same constellation. We have put the HelperClasses in the
J2EE/home/lib dir, NOT specifying it in the application.xml. So everything works fine.
The only thing: never, again: never put these files within WEB-INF and the lib-dir.
With the HelperClasses in both we have only faced massive problems, mostly ClasCastExceptions.
We had once all the helperClasses within J2EE/home/applications/lib, but this requires to
specify this dir within the orion-application.xml within the appl dir in applications-deployment.
It also worked fine.
2. How can i utilise connection pooling in oc4j. In data-sources.xml, i am using ...I'm not sure of this, but I think, the container handles Connection Pooling, no matter what Factory you
specify. But I think, the Class hasn't to be OracleConnectionPool ... but I have to check this (right now
I have no access to our datasource.xml ..)
cu
ed -
Urgent - (session bean calling Entity bean )Help Need for me - Plzzzzzzzzzz
Hi
I am created two beans one is Entity bean another one is session . the two beans deployed using diffrent jar files
. I call the Entity bean methods using session bean
But i couldn't locate the entity bean Home object through session bean(
Sub is created but i couldn't get it that home obj stub)
i get the following error messgae CorbaBad Operation
i deployed two bean using same jar means my program is working
Help meeeeeeeI Send part of code to u
public String logic1(rsp.ejbbm.ex.studVO s) {
rsp.ejbbm.student.studentRemote r=null;
String id = null;
try {
System.out.println("sdfsdfsdfs");
Object obj = ctx.lookup("ejb/student");
System.out.println("Lookup Succeded ");
System.out.println("Object value" +obj.toString());
/// HERE I GOT THE ERRO I COULDn'T Locate IT
EJBHome obj1 =(EJBHome)javax.rmi.PortableRemoteObject.narrow(obj,rsp.ejbbm.student.studentHome.class);
System.out.println("Object value" +obj1.toString());
rsp.ejbbm.student.studentHome home=(rsp.ejbbm.student.studentHome)obj1;
//studentHome hom=(studentHome)ctx.lookup("ejb/student");
System.out.println("Object value" +obj.toString() );
System.out.println("Lookup Converted ");
home.create(s.getRollno(),s.getName());
System.out.println("student Record isInserted in Oracle ");
r= (rsp.ejbbm.student.studentRemote) home.findByPrimaryKey(s.getRollno());
System.out.println("Student 5555 Name is "+ r.getName());
id = r.getName();
catch(Exception e ){
System.out.println(e.toString());}
return id;
* @see javax.ejb.SessionSynchronization#afterBegin()
public void afterBegin() {
* @see javax.ejb.SessionSynchronization#afterCompletion(boolean)
public void afterCompletion(boolean committed) {
* @see javax.ejb.SessionSynchronization#beforeCompletion()
public void beforeCompletion() {
* See section 7.10.3 of the EJB 2.0 specification
public void ejbCreate() {
Properties p = new Properties();
p.put("java.naming.factory.initial", "com.sun.jndi.cosnaming.CNCtxFactory");
try{
ctx = new InitialContext(p);
catch(Exception e) {System.out.println("Create Exception "+e.toString());}
} -
Entity bean connection with SQL Server Error! urgent
Hi,
I am working with J2EE tutorial and when i tried SavingsAccount Entity bean to connect with SQL Server 2000(other than default Cloudscape)and I'm also having SQL Server 2K JDBC Driver installed. I also made entries in Server Configuration menu of J2EE deployment tool for this MS JDBC Driver for SQL Server 2K,I will enclose my dbName and connection method in the entity bean , but i am getting error like this.
my data base name in SQL Server 2K is 'rajeshrNew'.
private String dbName="java:comp/env/jdbc/rajeshrNew"; //dbName
private void makeConnection() throws NamingException, SQLException {
InitialContext ic = new InitialContext();
DataSource ds = (DataSource) ic.lookup(dbName);
con = ds.getConnection();
and errors receiving are:
java.rmi.ServerException: RemoteException occurred in server thread; nested exception is:
java.rmi.RemoteException: nested exception is: javax.ejb.EJBException: Unable to connect to database. No suitable driver; nested exception is:
javax.ejb.EJBException: Unable to connect to database. No suitable driver
java.rmi.RemoteException: nested exception is: javax.ejb.EJBException: Unable to connect to database. No suitable driver; nested exception is:
javax.ejb.EJBException: Unable to connect to database. No suitable driver
javax.ejb.EJBException: Unable to connect to database. No suitable driver <<no stack trace available>>
Please help me to resolve this problem!!
Regards
Rajesh Ryes i do create System DSN with rajeshrNew and my default.properties file look like this..
# maximum size of message driven bean instance
# pool per mdb type
messagebean.pool.size=3
# maximum size of a "bulk" message bean delivery
messagebean.max.serversessionmsgs=1
# message-bean container resource cleanup interval
messagebean.cleanup.interval=600
passivation.threshold.memory=128000000
idle.resource.threshold=600
log.directory=logs
log.output.file=output.log
log.error.file=error.log
log.event.file=event.log
distributed.transaction.recovery=false
transaction.timeout=0
transaction.nonXA.optimization=true
sessionbean.timeout=0
# validating parser values
# validating.perser is used when archive file are loaded by
# any of the J2EE Reference Implementation tools.
# deployment.validating.parser is used when deploying an
# archive on the J2EE AppServer.
validating.parser=false
deployment.validating.parser=true
now u tell me what i have to change..
with regards
Rajesh
Maybe you are looking for
-
How to achieve (and test) the crossplatformity of an applet?
I've written an applet which I put in jar. It is successfully being launched on my system both locally and from geocities web site. (WinXP JDK 1.4 Forte4.0) A friend of mine could not load the applet from the web site. He has XP as well, but could be
-
Why does my new Composite AV cable shows no video using my 4s?
My new AV composite cable shows no video when I plug it in to my projector using my 4s?
-
Need Java API's to create OSB proxy and Business Services
Hi All, I need to create OSB proxy and business services using Java API's. Does any one have reference to the OSB APIs??
-
You will need to complete the CC Desktop update in order to install new CC apps on your computer. Just resume the install when you have restored connectivity by visiting the Download Center and clicking the Install link on any CC app, including the C
-
Where to Buy keyboard for MacBook
Need to know where to buy a keyboard for my MacBook