EJB and Threads
Can an EJB have got threads? I would like to know if i can do an EJB that has a process being executed always and by another side that attends the invocations of its methods of business.
I had thought to do a special client whose task was EJB's polling logic. This special client will call constantly to methods of the EJB that will be different from the business methods. On de other hand the normal clients will call to the business methods when they need it.
Is this idea possible to develop for Entity Bean? And for Session Bean?
Thanks.
Similar Messages
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Question about EJB and thread safe coding - asking again!
sorry everyone, no one seems to be interested in helping me on this, so i post it again.
i have a question about the EJB and thread safe coding. when we build EJBs, do we need to worry about thread safe issue? i know that EJBs are single threaded, and the container manages the thread for us. maybe i am wrong about this. if i wasnot, how can we program the EJB so that two or more instance of EJB are not going to have deadlock problem when accessing data resources. do we need to put syncronization in ours beans, do we even need to worry about creating a thread safe EJB? thanks in advance. the question really bothers me a lot lately.sorry everyone, no one seems to be interested in
helping me on this, so i post it again.Excellent plan. Why not search a little bit on your own instead of waiting for your personal forum slaves to answer your call. See below.
i have a question about the EJB and thread safe
coding. when we build EJBs, do we need to worry about
thread safe issue? Read this: http://forum.java.sun.com/thread.jsp?forum=13&thread=562598&tstart=75&trange=15
i know that EJBs are single
threaded, and the container manages the thread for us.
maybe i am wrong about this. if i wasnot, how can we
program the EJB so that two or more instance of EJB
are not going to have deadlock problem when accessing
data resources. do we need to put syncronization in
ours beans, do we even need to worry about creating a
thread safe EJB? thanks in advance. the question
really bothers me a lot lately.
Java's Thread Tutorial
JavaWorld: Introduction to Java threads
IBM: Introduction to Java threads
Google: java+threads+tutorial -
Using EJB and CommandBean as Model in WD
Hi Experts,
I'm quite new to DI. My problem is, I created an EJB which is accessing a DB. Now I created a commandBean which accesses the EJB. I want to use this commandBean as beanModel in WD. I created public parts for the CommandBean but when I want to create the model in WD-Perspective and choose used dc as source, I can't find the jar file of the commandBean, that I wanted to expose with the public parts. Do I create public parts the wrong way? Or what could be the error? Is my approach correct in using a commandBean to access the EJB and use the CommandBean as Model?
When I want to create the jar file of the CommandBean I get the following messages:
JAR creation failed. See details for additional information.
Problem writing /DI1_TP1IP1_Dzvejbhelpcom.bla/src/packages/com/sap/bla/MyCommandBean.jar to JAR: duplicate entry: com/sap/bla/MyCommandBean.jar
Problem writing /DI1_TP1IP1_Dzvejbhelpcom.bla/bin/com/sap/bla/MyCommandBean.class to JAR: duplicate entry: com/sap/bla/MyCommandBean.class
Problem writing /DI1_TP1IP1_Dzvejbhelpcom.chiron/src/packages/com/sap/bla/MyCommandBean.java to JAR: duplicate entry: com/sap/bla/MyCommandBean.java
But the jar file is created? Could it be corrupted?
Any help is appreciated
Regards ManuelHi Stefanie,
you're right. Web Services is the better approach. So I wanted to use a web service and created a session bean wich calls my entity bean. I created a web service around the session bean. But when I want to deploy the ear-Project with the web service I get the following exception. I already checked sdn for this problem, but I could'nt find the solution:
Caught exception during application deployment from SAP J2EE Engine's deploy service:
java.rmi.RemoteException: Cannot deploy application com.chiron/zv_ear.. Reason: Webservices common deployment exception! The reason is: Error occurred, trying to update web services for application com.chiron/zv_ear. . Additional info: none; nested exception is: java.lang.Exception: com.sap.engine.interfaces.webservices.server.deploy.WSDeploymentException: Webservices common deployment exception! The reason is: Error occurred, trying to update web services for application com.chiron/zv_ear. . Additional info: none
at com.sap.engine.services.webservices.server.deploy.ws.update.WSUpdateProcessor.updateWebServices(WSUpdateProcessor.java:164)
at com.sap.engine.services.webservices.server.deploy.ws.update.WSUpdateProcessor.updateWebServices(WSUpdateProcessor.java:118)
at com.sap.engine.services.webservices.server.deploy.ws.update.WSUpdateProcessor.updateWebServices(WSUpdateProcessor.java:86)
at com.sap.engine.services.webservices.server.deploy.ws.update.WSUpdateManager.makeUpdate(WSUpdateManager.java:52)
at com.sap.engine.services.webservices.server.deploy.WSDeployer.makeUpdate(WSDeployer.java:274)
at com.sap.engine.services.deploy.server.application.UpdateTransaction.makeComponents(UpdateTransaction.java:400)
at com.sap.engine.services.deploy.server.application.DeployUtilTransaction.commonBegin(DeployUtilTransaction.java:321)
at com.sap.engine.services.deploy.server.application.UpdateTransaction.begin(UpdateTransaction.java:164)
at com.sap.engine.services.deploy.server.application.ApplicationTransaction.makeAllPhasesOnOneServer(ApplicationTransaction.java:292)
at com.sap.engine.services.deploy.server.application.ApplicationTransaction.makeAllPhases(ApplicationTransaction.java:326)
at com.sap.engine.services.deploy.server.DeployServiceImpl.makeGlobalTransaction(DeployServiceImpl.java:3184)
at com.sap.engine.services.deploy.server.DeployServiceImpl.update(DeployServiceImpl.java:669)
at com.sap.engine.services.deploy.server.DeployServiceImplp4_Skel.dispatch(DeployServiceImplp4_Skel.java:1278)
at com.sap.engine.services.rmi_p4.DispatchImpl._runInternal(DispatchImpl.java:313)
at com.sap.engine.services.rmi_p4.DispatchImpl._run(DispatchImpl.java:199)
at com.sap.engine.services.rmi_p4.server.P4SessionProcessor.request(P4SessionProcessor.java:136)
at com.sap.engine.core.service630.context.cluster.session.ApplicationSessionMessageListener.process(ApplicationSessionMessageListener.java:33)
at com.sap.engine.core.cluster.impl6.session.MessageRunner.run(MessageRunner.java:41)
at com.sap.engine.core.thread.impl3.ActionObject.run(ActionObject.java:37)
at java.security.AccessController.doPrivileged(Native Method)
at com.sap.engine.core.thread.impl3.SingleThread.execute(SingleThread.java:100)
at com.sap.engine.core.thread.impl3.SingleThread.run(SingleThread.java:170)
Caused by: com.sap.engine.interfaces.webservices.server.deploy.WSDeploymentException: Webservices deployment exception! The reason is: Error occurred, trying to generate web services deployment files for application com.chiron/zv_ear. . The error refers to application: none, jar: , web service: .
at com.sap.engine.services.webservices.server.deploy.ws.update.WSUpdateProcessor.generateDeployFiles(WSUpdateProcessor.java:296)
at com.sap.engine.services.webservices.server.deploy.ws.update.WSUpdateProcessor.deployWebServices(WSUpdateProcessor.java:262)
at com.sap.engine.services.webservices.server.deploy.ws.update.WSUpdateProcessor.updateWebServices(WSUpdateProcessor.java:155)
... 21 more
Caused by: com.sap.engine.interfaces.webservices.server.deploy.WSDeploymentException: Webservices common deployment exception! The reason is: Error occurred, parsing com.sap.engine.services.webservices.server.deploy.descriptors.sapwebservices.WSDescriptor descriptor, application com.chiron/zv_ear, web service zvglWS, location message: type: jar file, location: F:\usr\sap\TP1\JC00\j2ee\cluster\server0\.\temp\deploy\work\deploying\reader1197465981374\com.chiron~zv_model3.jar . . Additional info:
at com.sap.engine.services.webservices.server.deploy.ws.WSDefinitionFactory.parseWSDescriptor(WSDefinitionFactory.java:907)
at com.sap.engine.services.webservices.server.deploy.ws.WSDefinitionFactory.loadWebService(WSDefinitionFactory.java:176)
at com.sap.engine.services.webservices.server.deploy.ws.WSDefinitionFactory.loadWebServices(WSDefinitionFactory.java:158)
at com.sap.engine.services.webservices.server.deploy.ws.update.WSUpdateProcessor.generateDeployFiles(WSUpdateProcessor.java:284)
... 23 more
Caused by: com.sap.engine.interfaces.webservices.server.deploy.WSDeploymentException: Webservices common deployment exception! The reason is: Error occurred, trying to parse documentation for web service zvglWS. . Additional info:
at com.sap.engine.services.webservices.server.deploy.ws.WSDefinitionFactory.parseDocumentation(WSDefinitionFactory.java:1590)
at com.sap.engine.services.webservices.server.deploy.ws.WSDefinitionFactory.parseWSDAndDocumentation(WSDefinitionFactory.java:1564)
at com.sap.engine.services.webservices.server.deploy.ws.WSDefinitionFactory.parseWSDescriptor(WSDefinitionFactory.java:814)
... 26 more
<b>Caused by: java.io.FileNotFoundException</b>: .\temp\webservices\deploy\com.chiron_zv_ear\webservices\com1\com\sap\chiron\zvglWSWsd.wsdef (The system cannot find the path specified)
at java.io.FileOutputStream.open(Native Method)
at java.io.FileOutputStream.<init>(FileOutputStream.java:179)
at java.io.FileOutputStream.<init>(FileOutputStream.java:131)
at com.sap.engine.lib.jar.JarExtractor.extractFile(JarExtractor.java:232)
at com.sap.engine.services.webservices.server.deploy.ws.WSArchiveFilesLocationHandler.getWsdInputStream(WSArchiveFilesLocationHandler.java:184)
at com.sap.engine.services.webservices.server.deploy.ws.WSDefinitionFactory.parseDocumentation(WSDefinitionFactory.java:1574)
... 28 more
(message ID: com.sap.sdm.serverext.servertype.inqmy.extern.EngineApplOnlineDeployerImpl.performAction(DeploymentActionTypes).REMEXC)
Deployment exception : The deployment of at least one item aborted
I already removed the ear and deployed again. That works one time, after that I get the exception again. But even when it works one time, I can't find the web service in the web service navigator of the j2ee engine.
Regards Manuel -
Error during EAR deployment with EJB and web service
I created a simple stateless EJB with one method called echo that returns a string. I created a web service using the wizard, did a build and deployed. The deployment did not report an error, but the logs in the visual administrator showed the follwoing message, and the web service did NOT deploy.
Am I missing something related to EJB and web service security?
PLEASE HELP ME.
>>> Warning: delete security configuration [apps/com.areva/ear/ejb/security/com.areva~ejb.jar]
[EXCEPTION]
java.lang.Exception
at com.sap.engine.services.security.server.PolicyConfigurations.unregisterPolicyConfiguration(PolicyConfigurations.java:153)
at com.sap.engine.services.ejb.EJBAdmin.remove(EJBAdmin.java:2538)
at com.sap.engine.services.deploy.server.application.RemoveTransaction.removeApplication(RemoveTransaction.java:294)
at com.sap.engine.services.deploy.server.application.RemoveTransaction.prepare(RemoveTransaction.java:178)
at com.sap.engine.services.deploy.server.application.ApplicationTransaction.makeAllPhasesOnOneServer(ApplicationTransaction.java:299)
at com.sap.engine.services.deploy.server.application.ApplicationTransaction.makeAllPhases(ApplicationTransaction.java:321)
at com.sap.engine.services.deploy.server.DeployServiceImpl.makeGlobalTransaction(DeployServiceImpl.java:3028)
at com.sap.engine.services.deploy.server.DeployServiceImpl.remove(DeployServiceImpl.java:820)
at com.sap.engine.services.deploy.server.DeployRuntimeControlImpl.remove(DeployRuntimeControlImpl.java:271)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at com.sap.pj.jmx.introspect.DefaultMBeanInvoker.invoke(DefaultMBeanInvoker.java:58)
at com.sap.pj.jmx.mbeaninfo.AdditionalInfoProviderMBean.invoke(AdditionalInfoProviderMBean.java:289)
at com.sap.pj.jmx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:944)
at com.sap.pj.jmx.server.interceptor.MBeanServerWrapperInterceptor.invoke(MBeanServerWrapperInterceptor.java:288)
at com.sap.engine.services.jmx.CompletionInterceptor.invoke(CompletionInterceptor.java:400)
at com.sap.engine.services.jmx.RedirectInterceptor.invoke(RedirectInterceptor.java:340)
at com.sap.pj.jmx.server.interceptor.MBeanServerInterceptorChain.invoke(MBeanServerInterceptorChain.java:330)
at com.sap.engine.services.jmx.MBeanServerSecurityWrapper.invoke(MBeanServerSecurityWrapper.java:287)
at com.sap.engine.services.jmx.MBeanServerInvoker.invokeMbs(MBeanServerInvoker.java:157)
at com.sap.engine.services.jmx.ClusterInterceptor.invokeMbs(ClusterInterceptor.java:220)
at com.sap.engine.services.jmx.ClusterInterceptor.invoke(ClusterInterceptor.java:803)
at com.sap.engine.services.jmx.MBeanServerInterceptorInvoker.invokeMbs(MBeanServerInterceptorInvoker.java:102)
at com.sap.engine.services.jmx.connector.p4.P4ConnectorServerImpl.invokeMbs(P4ConnectorServerImpl.java:61)
at com.sap.engine.services.jmx.connector.p4.P4ConnectorServerImplp4_Skel.dispatch(P4ConnectorServerImplp4_Skel.java:64)
at com.sap.engine.services.rmi_p4.DispatchImpl._runInternal(DispatchImpl.java:291)
at com.sap.engine.services.rmi_p4.DispatchImpl._run(DispatchImpl.java:183)
at com.sap.engine.services.rmi_p4.server.P4SessionProcessor.request(P4SessionProcessor.java:119)
at com.sap.engine.core.service630.context.cluster.session.ApplicationSessionMessageListener.process(ApplicationSessionMessageListener.java:37)
at com.sap.engine.core.cluster.impl6.session.UnorderedChannel$MessageRunner.run(UnorderedChannel.java:71)
at com.sap.engine.core.thread.impl3.ActionObject.run(ActionObject.java:37)
at java.security.AccessController.doPrivileged(Native Method)
at com.sap.engine.core.thread.impl3.SingleThread.execute(SingleThread.java:94)
at com.sap.engine.core.thread.impl3.SingleThread.run(SingleThread.java:162)I have the same message. I am running sp11.
Does anyone have an answer for this?????
>>> Warning: delete security configuration [apps/avalero.com/rtfa-ear/contextRoot]
[EXCEPTION]
java.lang.Exception
at com.sap.engine.services.security.server.PolicyConfigurations.unregisterPolicyConfiguration(PolicyConfigurations.java:153)
at com.sap.engine.services.servlets_jsp.server.container.WebContainerHelper.removeSecurityResources(WebContainerHelper.java:905)
at com.sap.engine.services.servlets_jsp.server.container.WebContainerHelper.remove(WebContainerHelper.java:447)
at com.sap.engine.services.servlets_jsp.server.container.RemoveAction.remove(RemoveAction.java:50)
at com.sap.engine.services.servlets_jsp.server.container.WebContainer.remove(WebContainer.java:150)
at com.sap.engine.services.deploy.server.application.RemoveTransaction.removeApplication(RemoveTransaction.java:294)
at com.sap.engine.services.deploy.server.application.RemoveTransaction.prepare(RemoveTransaction.java:178)
at com.sap.engine.services.deploy.server.application.ApplicationTransaction.makeAllPhasesOnOneServer(ApplicationTransaction.java:299)
at com.sap.engine.services.deploy.server.application.ApplicationTransaction.makeAllPhases(ApplicationTransaction.java:323)
at com.sap.engine.services.deploy.server.DeployServiceImpl.makeGlobalTransaction(DeployServiceImpl.java:3033)
at com.sap.engine.services.deploy.server.DeployServiceImpl.remove(DeployServiceImpl.java:821)
at com.sap.engine.services.deploy.server.DeployRuntimeControlImpl.remove(DeployRuntimeControlImpl.java:271)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at com.sap.pj.jmx.introspect.DefaultMBeanInvoker.invoke(DefaultMBeanInvoker.java:58)
at com.sap.pj.jmx.mbeaninfo.AdditionalInfoProviderMBean.invoke(AdditionalInfoProviderMBean.java:289)
at com.sap.pj.jmx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:944)
at com.sap.pj.jmx.server.interceptor.MBeanServerWrapperInterceptor.invoke(MBeanServerWrapperInterceptor.java:288)
at com.sap.engine.services.jmx.CompletionInterceptor.invoke(CompletionInterceptor.java:400)
at com.sap.pj.jmx.server.interceptor.BasicMBeanServerInterceptor.invoke(BasicMBeanServerInterceptor.java:277)
at com.sap.jmx.provider.ProviderInterceptor.invoke(ProviderInterceptor.java:255)
at com.sap.engine.services.jmx.RedirectInterceptor.invoke(RedirectInterceptor.java:340)
at com.sap.pj.jmx.server.interceptor.MBeanServerInterceptorChain.invoke(MBeanServerInterceptorChain.java:330)
at com.sap.engine.services.jmx.MBeanServerSecurityWrapper.invoke(MBeanServerSecurityWrapper.java:287)
at com.sap.engine.services.jmx.MBeanServerInvoker.invokeMbs(MBeanServerInvoker.java:157)
at com.sap.engine.services.jmx.ClusterInterceptor.invokeMbs(ClusterInterceptor.java:220)
at com.sap.engine.services.jmx.ClusterInterceptor.invoke(ClusterInterceptor.java:803)
at com.sap.engine.services.jmx.MBeanServerInterceptorInvoker.invokeMbs(MBeanServerInterceptorInvoker.java:102)
at com.sap.engine.services.jmx.connector.p4.P4ConnectorServerImpl.invokeMbs(P4ConnectorServerImpl.java:61)
at com.sap.engine.services.jmx.connector.p4.P4ConnectorServerImplp4_Skel.dispatch(P4ConnectorServerImplp4_Skel.java:64)
at com.sap.engine.services.rmi_p4.DispatchImpl._runInternal(DispatchImpl.java:294)
at com.sap.engine.services.rmi_p4.DispatchImpl._run(DispatchImpl.java:183)
at com.sap.engine.services.rmi_p4.server.P4SessionProcessor.request(P4SessionProcessor.java:119)
at com.sap.engine.core.service630.context.cluster.session.ApplicationSessionMessageListener.process(ApplicationSessionMessageListener.java:37)
at com.sap.engine.core.cluster.impl6.session.UnorderedChannel$MessageRunner.run(UnorderedChannel.java:71)
at com.sap.engine.core.thread.impl3.ActionObject.run(ActionObject.java:37)
at java.security.AccessController.doPrivileged(Native Method)
at com.sap.engine.core.thread.impl3.SingleThread.execute(SingleThread.java:94)
at com.sap.engine.core.thread.impl3.SingleThread.run(SingleThread.java:162) -
Expose ADF-BC as ejb and use it in UI from the datacontroller
Hi Experts.
Here i am looking forward some experts view and guidelines on this deployment architecture question. Currently i have deploped one ADF Web fusion application which has ADF-BC and web. In that web project datacontroller side i can be able to see the view object instances under each business service. Also the web has some UI bindings too. Now the application is working fine fine on one weblogic instance.
question1) Can i deploy this above project into two weblogic instances one with ADF-BC model ( if yes how to deploy that alone) and the other web into the another instance. ( If yes can to configure the project)
question 2) Now can i expose the ADF-BC as ejb and use it in the same way in the web (like drag and drop from the Data controller). ? I tried the option expose the ADF-BC as ejb In this case if the VO instance access methods are not exposed. So how can i access them in the UI? For example, assume if we have 2 view object EmployeeView and DepartmentView in the application module, then after immediately create the AM, the datacontrol shows the view object instances name like EmployeeView1, DepartmentView1 and also in the web we just drag and drop to create appropriate UI. This is fine. Now i create the ejb based on the AM. In the Remote interface i have the
void removeEntity(Object entityDTO)
method. If i look at the datacontrol section still the data controls remains same. I think this datacontrol still shows the ADF-BC direct connectivity. If i try to create the new ejb data control which points to the same AM ejb for web, then i couldn't see the above view instance name called EmployeeView1, DepartmentView1, where i can drag and drop in the UI.
I can only see methods like EJBHome etc.....
So this means i cannot use the Exposed EJB from the ADF-BC Application Module to drag and drop in UI like the ADF-BC direct unless we explicitly create the view access methods in the interface. Am i correct?
Or still am i getting the wrong assumption.
Much appreciated if u point some code to understand this.
-tThanks for the reply.
Basically we have found the way to expose the ADFBC as ejb and use it for data binding in the UI. I will update this thread soon about our finding. But now i have an architecture question, can we deploy as 3-tier deployment for ADF-BC using the exposed ejb interface? Because i am worrying we might run into some ADF issue in furture if we move this path. Oracle gurus please share your ideas or thoughts.
-t -
Help with EJB and JNDI, please
Hello. My name is Santiago, and i am a student from the University of Valladolid, in Spain. I am newcome in the world of EJB, I have done the first EJB from de Sun tutorial (I�m using the Sun Java System Application Server PE 8.2) and now I am trying to improve it in that way: I have the EJB and the client in diferent machines conected.
I am trying to understand how to use JNDI, but i have not good results :( I have read about using ldap but i dont know if it is apropiated, or if it is installed automaticaly with the sun aplication, or if i have to download and install it... i am not sure about anything :)
This is my client�s code (part of it)
Hashtable envirom = new Hashtable();
envirom.put(Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.ldap.LdapCtxFactory");
envirom.put("java.naming.factory.url.pkgs","com.sun.enterprise.naming");
envirom.put(Context.PROVIDER_URL,"iiop://Santiago:389");
envirom.put(Context.PROVIDER_URL,"ldap://192.168.1.101:389");
envirom.put(Context.SECURITY_AUTHENTICATION,"none");
InitialContext ctx = new InitialContext(envirom);
Object objref = ctx.lookup("java:comp/env/ejb/Multiplica");
When I try to connect in local mode (client and EJB in the same machine) i get something like that:
javax.naming.CommunicationException: 192.168.1.101:389 [Root exception is java.n
et.ConnectException: Connection refused: connect]
at com.sun.jndi.ldap.Connection.<init>(Connection.java:204)
at com.sun.jndi.ldap.LdapClient.<init>(LdapClient.java:118)
at com.sun.jndi.ldap.LdapClient.getInstance(LdapClient.java:1578)
at com.sun.jndi.ldap.LdapCtx.connect(LdapCtx.java:2596)
at com.sun.jndi.ldap.LdapCtx.<init>(LdapCtx.java:283)
It is even worse when i try it in different machines:
10-mar-2006... com.sun.corba.ee.impl.transport.SocketOrChannelConnectionImp1<init>
ADVERTENCIA: "IOP00410201: <COMM_FAILURE> Fallo de conexion: Tipo de socket: IIOP_CLEAR_TEXT;
name of host: portatil; puerto: 3700"
org.omg.CORBA.COMM_FAILURE: vmcid: SUN minor code:201 completed:No
Both SSOO are XP and I have disabled Firewalls.
PLEASE, if you colud help me It would fantastic, because I am in that trouble, i have tryed 1000 solutions but i am not able to understand it.
Hoping you can help me.
Santiago.This thread is now being followed up in:
http://swforum.sun.com/jive/thread.jspa?threadID=64092 -
Problem with EJB and JMS - Failed to obtain/create connection
hello ejb and jms programmers,
My problem is my topic MDB keep on retrieving the same message when there is a database connection failure. Maybe somebody could help me how to prevent to retrieve the same data?
Given:
- I purposedly turn off the pointbase database because im testing my error handling.
- Im using SJSAS 8 as my application server.
- My message Driven Bean of topic type.
- Im using CMP for my entity bean
Here is the scenario of whats happening - step by step:
1. A separate application publishes a message to JMS queue server
2. My MDB retrieves this message and do some processing then inserts a record (transaction history) in my database
3. But my db is turned off or down
4. My MDB sends a successful processing reply to the JMS queue server
5. Then i noticed that my server.log keeps on growing so when i opened it, the record was not inserted and printed the stacktrace below "RAR5117 : Failed to obtain/create connection. Reason : javax.transaction.SystemException" (complete stacktrace below)
6. I understand the cause of the stacktrace is because the DB is turned off. But what i dont understand is that my MDB keeps on reading the same message. Since my MDB is of topic type, isnt a topic MDB supposedly reads a message only once???
So my questions are:
1. how do i handle insert database error?
2. how can i stop my MDB from processing the same message?
3. any better suggestions?
Thank you in advance :)
leigh
*** more complete stack trace ***
[#|2005-01-09T15:35:57.097+0800|WARNING|sun-appserver-pe8.0.0_01|javax.enterprise.system.core.transaction|_ThreadID=17;|JTS5041: The resource manager is doing work outside a global transaction
javax.transaction.xa.XAException
at com.pointbase.xa.xaException.getXAException(Unknown Source)
at com.pointbase.xa.xaConnectionResource.start(Unknown Source)
at com.sun.gjc.spi.XAResourceImpl.start(XAResourceImpl.java:162)
[#|2005-01-09T15:35:57.167+0800|SEVERE|sun-appserver-pe8.0.0_01|javax.enterprise.resource.resourceadapter|_ThreadID=17;|RAR5027:Unexpected exception in resource pooling
javax.transaction.SystemException
at com.sun.jts.jta.TransactionImpl.enlistResource(TransactionImpl.java:185)
at com.sun.enterprise.distributedtx.J2EETransaction.enlistResource(J2EETransaction.java:360)
at com.sun.enterprise.distributedtx.J2EETransactionManagerImpl.enlistResource(J2EETransactionManagerImpl.java:303)
at com.sun.enterprise.distributedtx.J2EETransactionManagerOpt.enlistResource(J2EETransactionManagerOpt.java:115)
[#|2005-01-09T15:35:57.177+0800|WARNING|sun-appserver-pe8.0.0_01|javax.enterprise.resource.resourceadapter|_ThreadID=17;|RAR5117 : Failed to obtain/create connection. Reason : javax.transaction.SystemException|#]
[#|2005-01-09T15:35:57.227+0800|WARNING|sun-appserver-pe8.0.0_01|javax.enterprise.resource.resourceadapter|_ThreadID=17;|RAR5114 : Error allocating connection : [Error in allocating a connection. Cause: javax.transaction.SystemException]|#]
[#|2005-01-09T15:35:57.237+0800|SEVERE|sun-appserver-pe8.0.0_01|javax.enterprise.system.container.ejb|_ThreadID=17;|EJB5071: Some remote or transactional roll back exception occurred
com.sun.jdo.api.persistence.support.JDODataStoreException: JDO77006: SQL exception: state = null, error code = 0.
NestedException: java.sql.SQLException: Error in allocating a connection. Cause: javax.transaction.SystemException
FailedObjectArray: [[email protected]5ac]
at com.sun.jdo.spi.persistence.support.sqlstore.impl.TransactionImpl.getConnectionInternal(TransactionImpl.java:1444)
at com.sun.jdo.spi.persistence.support.sqlstore.impl.TransactionImpl.getConnection(TransactionImpl.java:1339)Hi annie,
Wherever you are handling database transactions,
you'd not be able to create a Connection if database
is closed (I think you mentioned turning off the
database) then at this condition, you should
certainly throw a System level exception and stop all
processing with some meaningful flow to indicate a
failure (like display message on UI). Even
network problems are handled by exceptions... so I
don't see a reason why you didn't wrap it in the
first place.
Anyway, try handling specific exceptions rather than
the general Exception... this will give you a better
idea of what to do in case of an exception.Yes i know this. I am practicing this in my non-j2ee server applications. But the j2ee app im making, i just pass the db url in the descriptor and the app server automatically creates the connection for my app. So where would i put exception handling?
2. how can i stop my MDB from processing the same
message?Guaranteed delivery is not supposed to stop
processing. It will continue to process the message
after certain intervals till the message is
delivered. You shouldn't deliver it at all, if you
are able to detect that the database is off
The problem here is that my MDB automatically retrieves the message from the JMS queue server. Im not the one retrieving the messages manually.
My assumed behavior of topic MDB is once the a certain MDB retrieves a message it will not retrieve the same message anymore.
thank you in advance.
leigh -
Can EJB and BC exist at the same time in one project?
having to use ADF's BC and EJB to access data in both way due to the special requirements, but I am always getting the deployment failure.
can Ejbs and BC components exist at the same time in one project?thanks for your reply.
I considered to separate the BC and EJB as the separate project. I just use the EJB component to implement the dynamic tree menu, whether a little make a mountain out of a molehill if you as a separate project. -
made in cosmos help please need it
using System;
using Cosmos.Compiler.Builder;
using System.Threading;
using System.Windows.Forms;
namespace IUOS
class Program
#region Cosmos Builder logic
// Most users wont touch this. This will call the Cosmos Build tool
[STAThread]
static void Main(string[] args)
BuildUI.Run();
#endregion
// Main entry point of the kernel
public static void Init()
var xBoot = new Cosmos.Sys.Boot();
xBoot.Execute();
Console.ForegroundColor = ConsoleColor.DarkBlue;
a:
Console.WriteLine("------------------------------");
Console.WriteLine("WELCOME TO THE NEWLY OS MADE BY THE STUDENTS OF IQRA UNIVERSITY!");
Console.WriteLine("------------------------------");
Console.WriteLine();
Console.WriteLine();
Console.WriteLine();
Console.WriteLine("\t _____
Console.WriteLine("\t| | | |
| | |");
Console.WriteLine("\t| | | |
| | |");
Console.WriteLine("\t| | | |
| | |");
Console.WriteLine("\t| | | |
| | |___________");
Console.WriteLine("\t| | | |
| | |");
Console.WriteLine("\t| | | |
| | |");
Console.WriteLine("\t| | | |
| | |");
Console.WriteLine("\t| | | |
| | |");
Console.WriteLine("\t| | | |
| | |");
Console.WriteLine("\t|_____| |____________| |____________| ____________");
string input;
Console.WriteLine();
Console.Write("\nAbout OS : a");
Console.Write("\nTo Shutdown : s");
Console.Write("\nTo Reboot : r");
Console.Write("\nStart Windows Normaly : n");
Console.WriteLine();
input = Console.ReadLine();
if (input == "s" || input == "S"){
Cosmos.Sys.Deboot.ShutDown();
else
if (input == "r" || input == "R"){
Cosmos.Sys.Deboot.Reboot();
else
if (input == "a" || input == "A"){
Console.ForegroundColor = ConsoleColor.DarkBlue;
Console.Clear();
Console.WriteLine("\n\n\n-------------------------------------");
Console.WriteLine("version: DISPLAYS OS VERSION");
Console.WriteLine("about: DISPLAYS INFO ABOUT ANGRY OS");
Console.WriteLine("hello or hi: DISPLAYS A HELLO WORLD");
Console.WriteLine("MESSAGE THAT WAS USED TO TEST THIS OS!!");
Console.WriteLine("-----------------------------------");
Console.Write("You Want to know : ");
input = Console.ReadLine();
if (input == "version"){
Console.WriteLine("--------------------");
Console.WriteLine("OS VERSION 0.1");
Console.WriteLine("--------------------");
else
if (input == "about"){
Console.WriteLine("--------------------------------------------");
Console.WriteLine("OS IS DEVELOPED BY Qazi Jalil-ur-Rahman & Syed Akber Abbas Jafri");
Console.WriteLine("--------------------------------------------");
Console.Write("Want to go back to the main window");
Console.Write("\nYes : ");
string ans = Console.ReadLine();
if (ans == "y" || ans == "Y")
goto a;
Thread.Sleep(10000);
else
if (input == "n" || input == "N")
Thread.Sleep(5000);
Console.Clear();
for (int i = 0; i <= 0; i++){
Console.Write("\n\n\n\n\t\t\t\t\t ____ ____ ___
Console.Write("\n\t\t|\t\t | | | |
| | | | | |");
Console.Write("\n\t\t|\t| | |---- | |
| | | | | |---");
Console.Write("\n\t\t|____|____| |____ |___ |____ |___| | | |___");
Thread.Sleep(500);
Thread.Sleep(5000);
Console.Clear();
BootUserInterface();
Console.ReadLine();
// Form1 fo = new Form1();
else{
for (int i = 0; i <= 5; i++){
Console.Beep();
Thread.Sleep(1000);
goto a;
while (true);
private static void BootUserInterface() {
Thread t = new Thread(UserInterfaceThread);
t.IsBackground = true;
t.SetApartmentState(ApartmentState.STA);
t.Start();
private static void UserInterfaceThread(object arg) {
Form1 frm = new Form1(); // use your own
Application.Run(frm);
Hi
Jalil Cracker,
>>when user pres n then it must go to a form but error arises and not working good and threading is not respondin
Could you post the error information? And which line caused this error？
If you want to show Form1, you can use form.show() method
Form1 frm = new Form1();
frm.Show();
In addition, Cosmos is an acronym for C# Open Source Managed Operating System. This is not Microsoft product.If the issue is related to Cosmos, it would be out of our support. Thanks for your understanding. And you need raise an issue at Cosmos site.
Best regards,
kristin
We are trying to better understand customer views on social support experience, so your participation in this interview project would be greatly appreciated if you have time. Thanks for helping make community forums a great place.
Click
HERE to participate the survey. -
WLS 8.1 two domains with EJB and webapp deployed has JVM conflicts?
Test configuration environment:
Windows 2003 server installed with weblogic 8.1 server and oracle 9i.
This weblogic server have two domains, one is for EJB deployment, the other is a webapp that implements accessing to oracle through EJB.
The issue is when we tested a method provided by the EJB that uses double to calculate some total value, the result was correct. But when we tested it using webapp that was deployed on the same server of EJB, it's result was negative or zero.
I think the reason is that the JVM which both EJB and webapp used for calculation was the same and may made some conflicts when they run at the same time.
Any suggestion would be greatly appreciated.
Thank you in advance!
Shuaibing
Message was edited by:
linuxappleThis morning I deployed that webapp to the Domain that deployed the EJB, The results of calculating in webapp's jsp was correct.
Any one be kind enough to tell me what the calling JVM differences between single domain(deployed by EJB and webapp) and two domains (deployed EJB and webapp separately)? -
How to master good design with EJB and JSP?
I use JSP to calling EJB. But the .jsp file is complex and it's difficult to maintain...I just want to work higher efficent with EJB,JSP and JavaBean. I want to know is there a good design with EJB and JSP? and is there any good material about MVC for EJB,JSP and JavaBean?
You should read the J2EE blueprint available on this website. Better download the PDF, and print it for yourself so you can read it anytime.
-
Weblogic Enterprise 5.1 and threads
I know when building servers based on WLE 4.2 in was a big no-no to link in threading libraries like pthread and thread. Is this still the case in Weblogic Enterprise 5.1?
According to the product information, WLE 5.1 does not support Oracle 8.1.6, it
only goes up to
Oracle 8.1.5. But in general, I thought that with oracle there are 2 sets of
libraries, one for threads and
one for non-threaded support. You need to use the correct one, in the case of
WLE, that would be the
non-threaded one.
MAS
Paul Power wrote:
Thanks Mary,
Do you know of any customers who have managed to work
with Oracle 8.1.6 without linking with the thread libraries ?
cheers,
P.
Mary Ann Slavin wrote in message <[email protected]>...
WLE 5.1 C++ is not a threaded product. Compiling WLE 5.1 C++ with thread
libraries is not supported and will give unpredictable results for allprograms.
This should not be done.
Paul Power wrote:
Hi Mary,
Is it a dictate from BEA that you "can't" link with thread libraries ?
We are using WLE 5.0.1 ( and some 5.1) with Oracle 8.1.6 on
Solaris and found that we had to link using -lthread in order to use
Oracle (not the case in 8.1.5)
We don't actually attempt to try any threading in our apps and
have not had any problems yet but if it's the case that there
are known problems using threads we'd love to hear about
them :-)
As an aside, is Oracle 8.1.6 cleared for use by WLE ?
P.
Mary Ann Slavin wrote in message <[email protected]>...
No matter how WLE 5.1 C++ is used, it cannot be compiled with threadedlibraries, so that restriction remains.
A WLE C++ server can act as a client and call a WLE Java Server. Doingthis does not require the WLE C++ server to be compiled with threaded
libraries.
Wendell MacKenzie wrote:
Does this also mean if CORBA C++ servers want to invoke threaded
JavaServers
the same DEFECT will be prevent this from being accomplished?
Mary Ann Slavin wrote:
WLE 5.1 does not have threads in the C++ clients or servers. Java
threads are naturally occuring in the language, however, there are WLE
restrictions on what can be done in the
Java threads. These are documented.
jd wrote:
I know when building servers based on WLE 4.2 in was a big no-no
to
link in threading libraries like pthread and thread. Is this still thecase
in Weblogic Enterprise 5.1?
> -
How to set classpath to EJB and Servlets
Hi all,
How can I add a classpath to EJB and Servlets in Weblogic 6.1, so that that classpath
can be achieved by both EJB jar and war file? I have deployed a .ear file having
the jar and war files. Now the EJBs inside the jar file are not reaching the class
files of the war file and the class files in the war file are not reaching to
the EJBs. Please let me know at the earliest.
AtanuHi.
You might try looking at the petstore example which combines webapps (war files) with
ejbs in an ear file to see how to do this. It may be a simple config problem.
Regards,
Michael
Atanu Dey wrote:
Hi all,
How can I add a classpath to EJB and Servlets in Weblogic 6.1, so that that classpath
can be achieved by both EJB jar and war file? I have deployed a .ear file having
the jar and war files. Now the EJBs inside the jar file are not reaching the class
files of the war file and the class files in the war file are not reaching to
the EJBs. Please let me know at the earliest.
Atanu--
Michael Young
Developer Relations Engineer
BEA Support -
Where do I put classes shared between EJBs and WAR
I have written some ValueObject classes stored in their own jar, they are used by a number of ejbs and and a Web application WAR. I have packaged the thing up as a single EAR but neither the EJBs or the jsps can see these classes.
How do I share these classes at each end. is their a general deployment descriptor solution or is it application server specific.
I am deploying to IBM Websphere 6verify .classpath file under your web folder for both options
Sorry, what do you mean is their a classpath value in the xml descriptors. I put my ValueObject into a jar within the WEB-INF\lib of the WAR but these arent seen by the EJBs which are within the EAR but not the WAR. Im not aware that there is a seperate WEB-INF directory for the EAR.
Structure as follows
app.ear
testejb.jar
META-INF
testweb.war
test.jsp
META-INF
WEB_INF
classes
testui.class
lib
valueobjects.jar -
How to pull data from EJB and present them using Swing ?
Hi all,
I've written stateful session bean which connect to Oracle database, and now I must write stand alone client application using Swing.
The client app must present the data and then let users add,delete and edit data and it must be flexible enough to iterate through the records.
The swing components can be JTextField,JTable etc.
How to pull the data from EJB and present them to users with the most efficient network trip ?
Thanks in advance
SetyaThanks,
Since the whole app originally was client-server app and I want to make it more scalable, so I decide to separate business logic in the EJB but I also want to keep the performance and the userfriendliness of the original user interface, and I want to continue using Swing as the original user interface does.
I've read about using Rowset and I need some opinions about this from you guys who already have some experience with it.
Any suggestions would be greatly appreciated.
Thanks
Setya
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