Cannot narrow remote object error?

Hello,
 
My application is composed of 2 different package A and B. All deployed in the same server. 
- A implements EJBA 
- B implements EJBB 
EJBA is registred in the JNDI tree as ejb.a 
When EJBB runs these line of code : 
Object obj = context.lookup("ejb.a"); 
System.out.println("ref:" + obj); // ref : com.coface.util.ejb.tools_cvb9yr_HomeImpl@a64642 
AHome home = (AHome) PortableRemoteObject.narrow(obj, AHome.class); 
Narrow raises : 
java.lang.ClassCastException: Cannot narrow remote object to AHome
at weblogic.iiop.PortableRemoteObjectDelegateImpl.narrow(PortableRemoteObjectDelegateImpl.java:242)
at javax.rmi.PortableRemoteObject.narrow(PortableRemoteObject.java:134)
 
I have no idea what can be wrong and how I can debug this kind of exception. 
I just noticed this odd "cvb9yr" in the looked up instance class. Thought I am not sure how this name is generated. 
Anyone could help me to track down the cause of this exception? 
Thanks 
 
Alexandre
Message was edited by:
acuenca

alexandre cuenca <> writes:
Do you have A's client jar in B's package? You might need this unless
they are in the same ear. Otherwise it looks like a classloding bug.
andy
Hello,
 
My application is composed of 2 different package A and B. All deployed in the same server. 
- A implements EJBA 
- B implements EJBB 
EJBA is registred in the JNDI tree as ejb.a 
When EJBB runs these line of code : 
Object obj = context.lookup("ejb.a"); 
System.out.println("ref:" + obj); // ref : com.coface.util.ejb.tools_cvb9yr_HomeImpl@a64642 
AHome home = (AHome) PortableRemoteObject.narrow(obj, AHome.class); 
Narrow raises : 
java.lang.ClassCastException: Cannot narrow remote object to AHome
at weblogic.iiop.PortableRemoteObjectDelegateImpl.narrow(PortableRemoteObjectDelegateImpl.java:242)
at javax.rmi.PortableRemoteObject.narrow(PortableRemoteObject.java:134)
 
I have no idea what can be wrong and how I can debug this kind of exception. 
I just noticed this odd "cvb9yr" in the looked up instance class. Thought I am not sure how this name is generated. 
Anyone could help me to track down the cause of this exception? 
Thanks 
 
Alexandre
Message was edited by:
acuenca--

Similar Messages

Java.lang.ClassCastException: Cannot narrow remote object weblogic.rmi.inte

Hi,
I am trying to deploy ejb3.0 on weblogic 10 server. I am able to find the JNDI name of the stateless session bean correctly, but getting an exception while narrowing it down. My ejb3.0 client is a standalone java client. I am trying to access the stateless session ejb3.0 bean.Please help me. i have been trying it for many days.
thanks in advance,
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[sanpraka@localhost certEjb]$ java -cp ./:/usr/weblogic/bea/wlserver_10.0/server/lib/weblogic.jar:/usr/weblogic/bea/wlserver_10.0/server/lib/wlclient.jar com.titan.clients.Client
Object is weblogic.rmi.internal.BasicRemoteRef - hostID: '5337880647112897730S:127.0.0.1:[7001,7001,-1,-1,-1,-1,-1]:wl_server:examplesServer', oid: '302', channel: 'null'
java.lang.ClassCastException: Cannot narrow remote object weblogic.rmi.internal.BasicRemoteRef - hostID: '5337880647112897730S:127.0.0.1:[7001,7001,-1,-1,-1,-1,-1]:wl_server:examplesServer', oid: '302', channel: 'null' to com.titan.travelagent.TravelAgentRemote
at weblogic.corba.server.naming.ReferenceHelperImpl.narrow(ReferenceHelperImpl.java:206)
at weblogic.rmi.extensions.PortableRemoteObject.narrow(PortableRemoteObject.java:88)
at weblogic.iiop.PortableRemoteObjectDelegateImpl.narrow(PortableRemoteObjectDelegateImpl.java:32)
at javax.rmi.PortableRemoteObject.narrow(Unknown Source)
at com.titan.clients.Client.main(Client.java:24)
[sanpraka@localhost certEjb]$

We have a similar problem. We have a web application (on server A) that invokes an EJB on a remote server (server B). This works fine, until we deploy another web application to server A at which point the existing web application starts to throw java.lang.ClassCastException when narrowing the remote EJB interface. The exception starts to be thrown at the moment the latter web application is deployed - start is not required.
The latter web application contains (actually in APP-INF/lib) the old version of the EJB remote interface, that somehow gets to be loaded into the classpath of the existing web application. The solution is to delete the old version of the EJB remote interface from APP-INF/lib of the latter web application (we didn't need it anyway), but it would be interesting to know in which circumstances classes can get mixed between enterprise applications.
I failed to reproduce the error in simple scenario, so this does not happen always.

Exception: Cannot narrow remote object to ...

Hi,
 in certain circumstances I get an Exception "Cannot narrow remote
 object to <some EJB-Home-Class>".
 My enviroment: weblogic 7.0, solaris, Java 1.3.1, J2EE-application
 (EJBs, Servlets, Database)
 In the init method of an start-up servlet I spawn some threads for a
 scheduler of the application. There are a scheduler core and some
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 The start-up servlet, all the other servlets and the schedulers
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 I tried to understand, what for an object I get as the result of the
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 <package>.SyncOrderQueueEJB_4o6qkf_HomeImpl
 - outside the app-server:
 <package>.SyncOrderQueueEJB_4o6qkf_HomeImpl_WLStub
 What happened here? The common servlets use the same functionality and
 work fine. Why I get different objects? Where is the bug?
 Any ideas?
 Thomas


I believe the problem is the threads you are starting are not using the
 context classloader of the current thread.
 -- Rob
 [email protected] wrote:
 > Hi,
 >
 > in certain circumstances I get an Exception "Cannot narrow remote
 > object to <some EJB-Home-Class>".
 >
 > My enviroment: weblogic 7.0, solaris, Java 1.3.1, J2EE-application
 > (EJBs, Servlets, Database)
 >
 > In the init method of an start-up servlet I spawn some threads for a
 > scheduler of the application. There are a scheduler core and some
 > worker classes.
 > The start-up servlet, all the other servlets and the schedulers
 > classes are in an web-archive (war-file) in an ear-archiv. Furthermore
 > there a some 3rd party archives in the ear-archive, a jndi.properties
 > file etc. The manifest file of the war-archive contains a class-path,
 > points to the 3rd party archives in the ear-archive.
 >
 > The schedulers workers code is simple:
 >
 > InitialContext jndiContext = ...getInitialContext();
 > Object obj = jndiContext.lookup(<some EJB>);
 >
 > - EJBs home interface (for example):
 > SyncOrderQueueHome home = (SyncOrderQueueHome)
 > javax.rmi.PortableRemoteObject.narrow(obj,
 > SyncOrderQueueHome.class);
 >
 > - EJBs remote interface:SyncOrderQueue sync = home.create();
 >
 > - call some business method
 > sync.createOrderQueue();
 > In the enviroment described above I get an " Exception: Cannot narrow
 > remote object to <package>.SyncOrderQueueHome".
 >
 > On the other hand the scheduler and all the workers work fine as a
 > standalone application (not in an app-server context) and in Oracles
 > app-server (OC4J, v.9.0.3).
 >
 > I tried to understand, what for an object I get as the result of the
 > JNDI lookup bevore the narrow method fails:
 > - in the app-servers context:
 > <package>.SyncOrderQueueEJB_4o6qkf_HomeImpl
 > - outside the app-server:
 > <package>.SyncOrderQueueEJB_4o6qkf_HomeImpl_WLStub
 >
 > What happened here? The common servlets use the same functionality and
 > work fine. Why I get different objects? Where is the bug?
 >
 > Any ideas?
 > Thomas

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http://acs.brodeurmedia.com/dev/

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Cannot narrow object??

Hi,
I previously had the following fragment of code inside a servlet (which worked fine):
Context ctx = new InitialContext();
BeanEJB beanEJB = null;
BeanEJBHome beanHome = null;
Object obj = ctx.lookup("ejb/BeanEJB");
beanHome = (BeanEJBHome ) PortableRemoteObject.narrow(obj, BeanEJBHome.class);However, I moved the above code to the run() method of a new thread I created and now the PortableRemoteObject.narrow() call throws a ClassCastException.
Can anyone help?
Thank you!

alexandre cuenca <> writes:
Do you have A's client jar in B's package? You might need this unless
they are in the same ear. Otherwise it looks like a classloding bug.
andy
Hello,
 
My application is composed of 2 different package A and B. All deployed in the same server. 
- A implements EJBA 
- B implements EJBB 
EJBA is registred in the JNDI tree as ejb.a 
When EJBB runs these line of code : 
Object obj = context.lookup("ejb.a"); 
System.out.println("ref:" + obj); // ref : com.coface.util.ejb.tools_cvb9yr_HomeImpl@a64642 
AHome home = (AHome) PortableRemoteObject.narrow(obj, AHome.class); 
Narrow raises : 
java.lang.ClassCastException: Cannot narrow remote object to AHome
at weblogic.iiop.PortableRemoteObjectDelegateImpl.narrow(PortableRemoteObjectDelegateImpl.java:242)
at javax.rmi.PortableRemoteObject.narrow(PortableRemoteObject.java:134)
 
I have no idea what can be wrong and how I can debug this kind of exception. 
I just noticed this odd "cvb9yr" in the looked up instance class. Thought I am not sure how this name is generated. 
Anyone could help me to track down the cause of this exception? 
Thanks 
 
Alexandre
Message was edited by:
acuenca--

Cannot persist detached object with @ManyToOne

I have a simple table that holds named relationships between 2 objects. I am using a @ManyToOne type from the relationship object to each of the parent and child objects.
If the parent and child have NOT already been persisted everything works fine. However if either of them have been previously persisted I fail with a "Cannot persist detached object" error. Why is this, and what is the resolution?
Through much trial and error I was never able to get em.merge to resolve the issue. However I did implement a @PrePersist and registered both parent and child in the UnitOfWork and this did make the problem go away. This 'hack' however cannot be the right solution since its not portable in any fashion across other ORM providers.
It's seems as though the Cascade.PERSIST should handle the fact that the objects have already been persisted?
The following is the relationship class:
@Entity
@Table(name="UDM_RELATIONS")
public class UdmRelationship extends UdmPersistentObject
* If the parent has not be saved then let the persist of this object take care of it.
* Don't touch the parent if this relationship is removed.
@ManyToOne(cascade=CascadeType.PERSIST)
@JoinColumn(name="PARENT_ID")
protected UdmPersistentObject parent = null;
* If the child has not be saved then let the persist of this object take care of it.
* Don't touch the parent if this relationship is removed.
@ManyToOne(cascade=CascadeType.PERSIST)
@JoinColumn(name="CHILD_ID")
protected UdmPersistentObject child = null;
* Name the relationship for easier querying and viewing of direct table data.
@Column(name="REL_NAME")
protected String relationshipName = null;
// Initialization
public UdmRelationship(String relationshipName)
this.relationshipName = relationshipName;
public UdmRelationship()
Annotation annotation = this.getClass().getAnnotation(DiscriminatorValue.class);
if ( annotation != null )
DiscriminatorValue dv = (DiscriminatorValue) annotation;
this.relationshipName = dv.value();
// Data Management
@XmlAttribute(name="type")
protected String getRelationshipName() { return this.relationshipName; }
@XmlTransient
protected UdmPersistentObject getParent() { return this.parent; }
protected void setParent(UdmPersistentObject parent) { this.parent = parent; }
@XmlTransient
protected UdmPersistentObject getChild() { return this.child; }
protected void setChild(UdmPersistentObject child) { this.child = child; }
@PrePersist
public void merge()
Server server = (Server) SessionManager.getManager().getSession("udm-tests");
Session session = (Session)server.getActiveSession();
session.acquireUnitOfWork().registerObject(this.parent);
session.acquireUnitOfWork().registerObject(this.child);
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junit.framework.AssertionFailedError: Unable to create Personal Contact: [Persistent Object [com.riscs.tools.data.udm.support.PersonalContact] save failed.; nested exception is javax.persistence.EntityExistsException:
Exception Description: Cannot persist detached object [com.riscs.tools.data.udm.support.Person@1f47ae8].
Class> com.riscs.tools.data.udm.support.Person Primary Key> [403]]

Hello,
I wasn't clear. Merge is used on unmanaged objects to 'merge' the changes into the managed object. If the object is new, it will return a managed copy of the object. The only difference between merge and persist when passed in a new object, is that persist makes the passed in object managed, where as merge returns a managed copy - the object passed in remains unmanaged.
As for it being a no-op - it takes a unmanaged copy of an object and returns the managed copy. It will take any changes and merge them into the managed copy, which as you said, is a no-op if there aren't changes. But your object model must have changes - you set a parent-child bidirectional relationship. Also, merge will cascade over the tree. So if you call it on your parent, and you have added a new child in say a 1:M mapping, it will persist the child - if you have the relation set to cascade merge+persist.
What are the problems you run into with merge?
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Best Regards,
Chris

Cannot Create Automation Object

Hi All,
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Environment:
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3. IBM Lotus Notes Version 8
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5. Symantec AntiVirus Full Version 10.1.5.5000
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4. Reinstalled Crystal Reports 8.5, no effect on first problem, installed
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Is this happening in the Report Designer or in an application?
Please re-post if this is still an issue or purchase a case and have a dedicated support engineer work with you directly:
http://store.businessobjects.com/store/bobjamer/DisplayProductByTypePage&parentCategoryID=&categoryID=11522300?resid=-Z5tUwoHAiwAAA8@NLgAAAAS&rests=1254701640551

ORA-04052: error occurred when looking up remote object SYS.DBMS_UTILITY@..

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3 build immediate
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PL/SQL: ORA-04052: error occurred when looking up remote object.

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I'm getting the following error message while executing a PL/SQL Block.
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Hi Kanchana,
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*009*

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Hi Gurus,
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OS: OEL5 32 bit
oifcfg iflist
eth0 192.168.2.0
eth1 10.0.0.0
oifcfg getif
eth1 10.0.0.0 global cluster_interconnect
eth1 10.1.1.0 global cluster_interconnect
eth0 192.168.2.0 global public
cat /etc/hosts
192.168.2.3 sunny1pub.ezhome.com sunny1pub
192.168.2.4 sunny2pub.ezhome.com sunny2pub
192.168.2.33 sunny1vip.ezhome.com sunny1vip
192.168.2.44 sunny2vip.ezhome.com sunny2vip
10.1.1.1 sunny1prv.ezhome.com sunny1prv
10.1.1.2 sunny2prv.ezhome.com sunny2prv
My questions are:
should ping on sunny1vip and sunny2vip be already working? As of now they dont work.
if you look at oifcfg getif, I initially had eth1 10.0.0.0 global cluster_interconnect,eth0 192.168.2.0 global public then I created eth1 10.1.1.0 global cluster_interconnect with setif. Should it be 10.1.1.0 or 10.0.0.0. I looked at the subnet calculator and it says for 10.1.1.1, 10.0.0.0 is the subnet. In metalink they had used 10.10.10.0 and hence I used 10.1.1.0
Any ideas on resolving this issue would be very much appreciated. I had been searching on oracle forums, google, metalink but all of them refer to DOC Id 414163.1 but it does n't seem to work. Please help. Thanks in advance.
Edited by: ayyappa on Aug 20, 2009 10:13 AM
Edited by: ayyappa on Aug 20, 2009 10:14 AM
Edited by: ayyappa on Aug 20, 2009 10:15 AM

a step forward towards resolution but i need some help from the gurus.
root# cat /etc/hosts
127.0.0.1 localhost.localdomain localhost
::1 localhost6.localdomain6 localhost6
192.168.2.3 sunny1pub.ezhome.com sunny1pub
192.168.2.4 sunny2pub.ezhome.com sunny2pub
10.1.1.1 sunny1prv.ezhome.com sunny1prv
10.1.1.2 sunny2prv.ezhome.com sunny2prv
192.168.2.33 sunny1vip.ezhome.com sunny1vip
192.168.2.44 sunny2vip.ezhome.com sunny2vip
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eth1 10.0.0.0
eth0 192.168.2.0
root# /u01/app/oracle/product/crs/bin/oifcfg getif
eth1 10.0.0.0 global cluster_interconnect
eth0 191.168.2.0 global public
root# /u01/app/oracle/product/10.1.0/Db_1/bin/srvctl config nodeapps -n sunny1pub -a
****ORACLE_HOME environment variable not set!
ORACLE_HOME should be set to the main directory that contain oracle products. set and export ORACLE_HOME, then re-run.
root# export ORACLE_BASE=/u01/app/oracle
root# export ORACLE_HOME=/u01/app/oracle/product/10.1.0/Db_1
root# export ORA_CRS_HOME=/u01/app/oracle/product/crs
root# export PATH=$PATH:$ORACLE_HOME/bin
root# /u01/app/oracle/product/10.1.0/Db_1/bin/srvctl config nodeapps -n sunny1pub -a
VIP does not exist.
root# /u01/app/oracle/product/10.1.0/Db_1/bin/srvctl add nodeapps -n sunny1pub -o $ORACLE_HOME -A 192.168.2.33/255.255.255.0
root# /u01/app/oracle/product/10.1.0/Db_1/bin/srvctl add nodeapps -n sunny2pub -o $ORACLE_HOME -A 192.168.2.44/255.255.255.0
root# /u01/app/oracle/product/10.1.0/Db_1/bin/srvctl config nodeapps -n sunny1pub -a
VIP exists.: sunny1vip.ezhome.com/192.168.2.33/255.255.255.0
root# /u01/app/oracle/product/10.1.0/Db_1/bin/srvctl config nodeapps -n sunny2pub -a
VIP exists.: sunny2vip.ezhome.com/192.168.2.44/255.255.255.0
Once I execute the add nodeapps command as root on node 1, I was able to get vip exists for config nodeapps on node 2. The above 2 statements resulted me with same values on both nodes. After this I executed root.sh on both nodes, I did not receive any errors. It said CRS resources are already configured.
My questions to the gurus are as follows:
Should ping on vip work? It does not work now.
srvctl status nodeapps -n sunny1pub(same result for sunny2pub)
VIP is not running on node: sunny1pub
GSD is not running on node: sunny1pub
PRKO-2016 : Error in checking condition of listener on node: sunny1pub
ONS daemon is not running on node: sunny1pub
[root@sunny1pub ~]# /u01/app/oracle/product/crs/bin/crs_stat -t
Name Type Target State Host
ora....pub.gsd application OFFLINE OFFLINE
ora....pub.ons application OFFLINE OFFLINE
ora....pub.vip application OFFLINE OFFLINE
ora....pub.gsd application OFFLINE OFFLINE
ora....pub.ons application OFFLINE OFFLINE
ora....pub.vip application OFFLINE OFFLINE
Will crs_stat and srvctl status nodeapps -n sunny1pub work after I upgrade my database or should they be working now already? I just choose to install 10.1.0.3 software and after running root.sh on both nodes, I clicked ok and then the End of installation screen appeared. Under installed products, I see 9i home, 10g home, crs home. Under 10g home and crs home, I see cluster nodes(sunny1pub and sunny2pub) So it looks like the 10g software is installed.

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Using Linux Threading Library.
/opt/netpoint/identity/oblix/apps/common/bin/ois_server: error while loading shared libraries: libpthread.so.0: cannot open shared object file: No such file or directory
rm: error while loading shared libraries: libc.so.6: cannot open shared object file: No such file or directory
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thanks. Your help is very much appreciated.
thanks.

I resolved the issue by commenting "LD" in start_ois_server.

Error Message: JBO-25009: Cannot create an object of type:oracle.jbo.domain

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