RE: [JBoss-user] EJB reference to external EJB
Title: RE: [JBoss-user] EJB reference to external EJB Thanks for your replies Scott and Dan. My understanding of what is being said... I have an EJB 1 in EAR A that wants to reference EJB 2 in EAR B where both EARs are deployed in the same VM. According to the EJB spec, l cant use local interfaces to do this because the specs ejb-local-ref doesnt accomdate this. According to the EJB spec, l CAN use remote interfaces to do this because ejb-ref does accomodate this. When l use remote interfaces to create the link between the two EJB's, l use ejb-ref in EJB 1's ejb-jar.xml to reference the remote interface of EJB 2. I also use ejb-ref/jndi-name in EJB 1's jboss.xml to reference the JNDI name in the global namespace of EJB 2's remote interface. Because both applications are in the same VM, JBoss uses the local interfaces of EJB 2 instead of the remote interfaces. So EJB 1's deployment descriptors would be, [ejb-jar.xml] entity ejb-nameEJB1/ejb-name ... ejb-ref ejb-ref-nameejb/EJB2/ejb-ref-name ejb-ref-typeSession/ejb-ref-type homecom.company.EJB2RemoteHome/home remotecom.company.EJB2Remote/remote /ejb-ref /entity [jboss.xml] entity ejb-nameEJB1/ejb-name ... ejb-ref ejb-ref-nameejb/EJB2/ejb-ref-name jndi-nameEJB2RemoteHome/jndi-name /ejb-ref /entity And EJB 2's descriptors would be, [ejb-jar.xml] session ejb-nameEJB2/ejb-name homecom.company.EJB2RemoteHome/home remotecom.company.EJB2Remote/remote ... /session [jboss.xml] session ejb-nameEJB2/ejb-name jndi-nameEJB2RemoteHome/jndi-name ... /session Is this correct? Thanks -Original Message- From: Scott M Stark [mailto:[EMAIL PROTECTED]] Sent: Tuesday, June 17, 2003 4:52 PM To: [EMAIL PROTECTED] Subject: Re: [JBoss-user] EJB reference to external EJB This cannot be done, the ejb-link has to refer to an ejb in the same application. The overhead introduced by the remote interface is optimized away by default so its a minor performance issue when the caller and callee are in the same vm. Scott Stark Chief Technology Officer JBoss Group, LLC - Original Message - From: Burns, Jamie To: '[EMAIL PROTECTED]' Sent: Tuesday, June 17, 2003 4:37 AM Subject: RE: [JBoss-user] EJB reference to external EJB Ok. That works. Thanks Dan. Now l am using remote interfaces between applications in the same VM. In this situation l want the performance benefits of using local interfaces. Ive had a look in the EJB spec and there doesnt seem to be anything in there to say an application cant have a local ref to an EJB in another application in the same VM. Im assuming the ejb-link element is available as a convenience. Is anyone able to provide some ejb-jar.xml and jboss.xml that shows an EJB in one application with a local ref to an EJB in another application in the same VM? Thanks. This electronic mail system is used for information purposes and is not intended to form any legal contract or binding agreement. The content is confidential and may be legally privileged. Access by anyone other than the addressee(s) is unauthorised and any disclosure, copying, distribution or any other action taken in reliance on it is prohibited and maybe unlawful All incoming and outgoing e-mail communications and attachments are scanned automatically by software designed to detect and remove any material containing viruses or other unauthorised content. While we undertake best endeavours to ensure that this content checking software is up to date, recipients should take steps to assure themselves that e-mails received are secure. ***
RE: [JBoss-user] EJB reference to external EJB
Title: Message Seems pretty straight to me. -- Danny Yates -Original Message-From: Burns, Jamie [mailto:[EMAIL PROTECTED] Sent: 18 June 2003 10:48To: '[EMAIL PROTECTED]'Subject: RE: [JBoss-user] EJB reference to external EJB Thanks for your replies Scott and Dan. My understanding of what is being said... I have an EJB 1 in EAR A that wants to reference EJB 2 in EAR B where both EARs are deployed in the same VM. According to the EJB spec, l cant use local interfaces to do this because the specs ejb-local-ref doesnt accomdate this. According to the EJB spec, l CAN use remote interfaces to do this because ejb-ref does accomodate this. When l use remote interfaces to create the link between the two EJB's, l use ejb-ref in EJB 1's ejb-jar.xml to reference the remote interface of EJB 2. I also use ejb-ref/jndi-name in EJB 1's jboss.xml to reference the JNDI name in the global namespace of EJB 2's remote interface. Because both applications are in the same VM, JBoss uses the local interfaces of EJB 2 instead of the remote interfaces. So EJB 1's deployment descriptors would be, [ejb-jar.xml] entity ejb-nameEJB1/ejb-name ... ejb-ref ejb-ref-nameejb/EJB2/ejb-ref-name ejb-ref-typeSession/ejb-ref-type homecom.company.EJB2RemoteHome/home remotecom.company.EJB2Remote/remote /ejb-ref /entity [jboss.xml] entity ejb-nameEJB1/ejb-name ... ejb-ref ejb-ref-nameejb/EJB2/ejb-ref-name jndi-nameEJB2RemoteHome/jndi-name /ejb-ref /entity And EJB 2's descriptors would be, [ejb-jar.xml] session ejb-nameEJB2/ejb-name homecom.company.EJB2RemoteHome/home remotecom.company.EJB2Remote/remote ... /session [jboss.xml] session ejb-nameEJB2/ejb-name jndi-nameEJB2RemoteHome/jndi-name ... /session Is this correct? Thanks -Original Message- From: Scott M Stark [mailto:[EMAIL PROTECTED]] Sent: Tuesday, June 17, 2003 4:52 PM To: [EMAIL PROTECTED] Subject: Re: [JBoss-user] EJB reference to external EJB This cannot be done, the ejb-link has to refer to an ejb in the same application. The overhead introduced by the remote interface is optimized away by default so its a minor performance issue when the caller and callee are in the same vm. Scott Stark Chief Technology Officer JBoss Group, LLC - Original Message - From: Burns, Jamie To: '[EMAIL PROTECTED]' Sent: Tuesday, June 17, 2003 4:37 AM Subject: RE: [JBoss-user] EJB reference to external EJB Ok. That works. Thanks Dan. Now l am using remote interfaces between applications in the same VM. In this situation l want the performance benefits of using local interfaces. Ive had a look in the EJB spec and there doesnt seem to be anything in there to say an application cant have a local ref to an EJB in another application in the same VM. Im assuming the ejb-link element is available as a convenience. Is anyone able to provide some ejb-jar.xml and jboss.xml that shows an EJB in one application with a local ref to an EJB in another application in the same VM? Thanks. This electronic mail system is used for information purposes and is not intended to form any legal contract or binding agreement. The content is confidential and may be legally privileged. Access by anyone other than the addressee(s) is unauthorised and any disclosure, copying, distribution or any other action taken in reliance on it is prohibited and maybe unlawful All incoming and outgoing e-mail communications and attachments are scanned automatically by software designed to detect and remove any material containing viruses or other unauthorised content. While we undertake best endeavours to ensure that this content checking software is up to date, recipients should take steps to assure themselves that e-mails received are secure. *** _ Notice to recipient: The information in this internet e-mail and any attachments is confidential and may be privileged. It is intended solely for the addressee. If you are not the intended addressee please notify the sender immediately by telephone. If you are not the intended recipient, any disclosure, copying, distribution or any action taken or omitted to be taken in reliance on it, is prohibited and may be unlawful. When addressed to external clients any opinions or advice contained in this internet e-mail are subject to the terms and conditions expressed in any applicable governing terms of business or client engagement letter issued by the pertinent Bank of America group entity. If this email originates from the U.K
RE: [JBoss-user] EJB reference to external EJB
JBoss still uses the remote interfaces of ejb 2 (that is what you ask for) but the invocation has local interface semantics since, inside the vm, objects are not copied by jboss on a call through the remote interfaces. david jencks On 2003.06.18 05:47 Burns, Jamie wrote: Thanks for your replies Scott and Dan. My understanding of what is being said... I have an EJB 1 in EAR A that wants to reference EJB 2 in EAR B where both EARs are deployed in the same VM. According to the EJB spec, l cant use local interfaces to do this because the specs ejb-local-ref doesnt accomdate this. According to the EJB spec, l CAN use remote interfaces to do this because ejb-ref does accomodate this. When l use remote interfaces to create the link between the two EJB's, l use ejb-ref in EJB 1's ejb-jar.xml to reference the remote interface of EJB 2. I also use ejb-ref/jndi-name in EJB 1's jboss.xml to reference the JNDI name in the global namespace of EJB 2's remote interface. Because both applications are in the same VM, JBoss uses the local interfaces of EJB 2 instead of the remote interfaces. So EJB 1's deployment descriptors would be, [ejb-jar.xml] entity ejb-nameEJB1/ejb-name ... ejb-ref ejb-ref-nameejb/EJB2/ejb-ref-name ejb-ref-typeSession/ejb-ref-type homecom.company.EJB2RemoteHome/home remotecom.company.EJB2Remote/remote /ejb-ref /entity [jboss.xml] entity ejb-nameEJB1/ejb-name ... ejb-ref ejb-ref-nameejb/EJB2/ejb-ref-name jndi-nameEJB2RemoteHome/jndi-name /ejb-ref /entity And EJB 2's descriptors would be, [ejb-jar.xml] session ejb-nameEJB2/ejb-name homecom.company.EJB2RemoteHome/home remotecom.company.EJB2Remote/remote ... /session [jboss.xml] session ejb-nameEJB2/ejb-name jndi-nameEJB2RemoteHome/jndi-name ... /session Is this correct? Thanks -Original Message- From: Scott M Stark [mailto:[EMAIL PROTECTED] Sent: Tuesday, June 17, 2003 4:52 PM To: [EMAIL PROTECTED] Subject: Re: [JBoss-user] EJB reference to external EJB This cannot be done, the ejb-link has to refer to an ejb in the same application. The overhead introduced by the remote interface is optimized away by default so its a minor performance issue when the caller and callee are in the same vm. Scott Stark Chief Technology Officer JBoss Group, LLC - Original Message - From: Burns, Jamie To: '[EMAIL PROTECTED]' Sent: Tuesday, June 17, 2003 4:37 AM Subject: RE: [JBoss-user] EJB reference to external EJB Ok. That works. Thanks Dan. Now l am using remote interfaces between applications in the same VM. In this situation l want the performance benefits of using local interfaces. Ive had a look in the EJB spec and there doesnt seem to be anything in there to say an application cant have a local ref to an EJB in another application in the same VM. Im assuming the ejb-link element is available as a convenience. Is anyone able to provide some ejb-jar.xml and jboss.xml that shows an EJB in one application with a local ref to an EJB in another application in the same VM? Thanks. This electronic mail system is used for information purposes and is not intended to form any legal contract or binding agreement. The content is confidential and may be legally privileged. Access by anyone other than the addressee(s) is unauthorised and any disclosure, copying, distribution or any other action taken in reliance on it is prohibited and maybe unlawful All incoming and outgoing e-mail communications and attachments are scanned automatically by software designed to detect and remove any material containing viruses or other unauthorised content. While we undertake best endeavours to ensure that this content checking software is up to date, recipients should take steps to assure themselves that e-mails received are secure. *** !DOCTYPE HTML PUBLIC -//W3C//DTD HTML 3.2//EN HTML HEAD META HTTP-EQUIV=Content-Type CONTENT=text/html; charset=us-ascii META NAME=Generator CONTENT=MS Exchange Server version 5.5.2653.12 TITLERE: [JBoss-user] EJB reference to external EJB/TITLE /HEAD BODY PFONT SIZE=2Thanks for your replies Scott and Dan./FONT /P PFONT SIZE=2My understanding of what is being said.../FONT /P PFONT SIZE=2I have an EJB 1 in EAR A that wants to reference EJB 2 in EAR B where both EARs are deployed in the same VM. According to the EJB spec, l cant use local interfaces to do this because the specs ejb-local-ref doesnt accomdate this. According to the EJB spec, l CAN use remote interfaces to do this because ejb-ref does accomodate this./FONT/P PFONT SIZE=2When l use remote
RE: [JBoss-user] EJB reference to external EJB
Title: Message Hi, I would guess you should be using a remote reference, not a local reference. Rgds, Dan. -- Danny Yates -Original Message-From: Burns, Jamie [mailto:[EMAIL PROTECTED] Sent: 16 June 2003 17:33To: [EMAIL PROTECTED]Subject: [JBoss-user] EJB reference to external EJB Im trying to link an EJB to an EJB deployed in another application within JBoss. JBoss Administration and Developement (2nd Ed) says under "EJB References with jboss.xml and jboss-web.xml" (pg 110 of Naming on JBoss...) "The ejb-link element cannot be used to refer to EJB's in another enterprise application. If your ejb-ref needs to access an external EJB, you can specify the jndi name of the deployed EJB home using the jboss.xml ejb-ref/jndi-name element" So l have used the following in jboss.xml entity ejb-nameHistoryEntity/ejb-namejndi-nameHistoryEntityRemoteHome/jndi-namelocal-jndi-nameHistoryEntityLocalHome/local-jndi-nameejb-local-ref ejb-local-ref-nameejb/SequenceSession/ejb-local-ref-namejndi-nameSequenceSessionLocalHome/jndi-name/ejb-local-ref /entity In my ejb-jar.xml l have entity ejb-nameHistoryEntity/ejb-name ... ejb-local-ref ejb-ref-nameejb/SequenceSession/ejb-ref-nameejb-ref-typeSession/ejb-ref-typelocal-homecom.newellandbudge.commons.ejb.common.SequenceSessionLocalHome/local-homelocalcom.newellandbudge.commons.ejb.common.SequenceSessionLocal/local/ejb-local-ref /entity The SequenceSession EJB is defined in the jboss.xml and ejb-jar.xml of another EAR as [jboss.xml] session ejb-nameSequenceSession/ejb-namejndi-nameSequenceSessionRemoteHome/jndi-namelocal-jndi-nameSequenceSessionLocalHome/local-jndi-name /session [ejb-jar.xml] session ejb-nameSequenceSession/ejb-name homecom.newellandbudge.commons.ejb.common.SequenceSessionRemoteHome/home remotecom.newellandbudge.commons.ejb.common.SequenceSessionRemote/remote local-homecom.newellandbudge.commons.ejb.common.SequenceSessionLocalHome/local-home localcom.newellandbudge.commons.ejb.common.SequenceSessionLocal/local ejb-classcom.newellandbudge.commons.ejb.SequenceSessionBean/ejb-class session-typeStateless/session-type .../session When the EAR with HistoryEntity is deployed l get following DeploymentException 16:48:23,812 WARN [ServiceController] Problem starting service jboss.j2ee:jndiName=HistoryEntityRemoteHome,service=EJBorg.jboss..deployment.DeploymentException: Local references currently require ejb-link at org.jboss.ejb.Container.setupEnvironment(Container.java:876) at org.jboss.ejb.Container.startService(Container.java:568) at org.jboss.ejb.EntityContainer.startService(EntityContainer.java:325) at org.jboss.system.ServiceMBeanSupport.start(ServiceMBeanSupport.java:192) 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 org.jboss.mx.capability.ReflectedMBeanDispatcher.invoke(ReflectedMBeanDispatcher.java:284) at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:549) at org.jboss.system.ServiceController$ServiceProxy.invoke(ServiceController..java:966) at $Proxy11.start(Unknown Source) Firstly, the message in this exception seems to contradict the statement about the ejb-link element. Secondly, the EJB spec says that the ejb-link element can only be used to link to another EJB in the same ejb-jar or another jar in the same application. If l follow the advise of the DeploymentException my deployment fails because the SequenceSession EJB is not in the same ejb-jar or application as my HistoryEntity EJB. I cant see a way forward with this situation. I dont want to have to deploythe SequenceSession EJBin every application that uses it. What is the solution to this problem? Or could someone shed some more light on the use of ejb-ref/jndi-name in jboss.xml? (Im using JBoss 3.2.1) Thanks This electronic mail system is used for information purposes and is not intended to form any legal contract or binding agreement. The content is confidential and may be legally privileged. Access by anyone other than the addressee(s) is unauthorised and any disclosure, copying, distribution or any other action taken in reliance on it is prohibited and maybe unlawful All incoming and outgoing e-mail communications and attachments are scanned automatically by software designed to detect and remove any material containing viruses or other unauthorised content. While we undertake best endeavours to ensure that this
RE: [JBoss-user] EJB reference to external EJB
Title: Message Hi, I'm not up on the spec per se, but my understanding is that local references should only be used in the same JAR file (or EAR file) - essentially, within the same classloader. I believe that in cases such as this JBoss essentially uses local references any way, so the overhead should be minimal. Dan. -- Danny Yates -Original Message-From: Burns, Jamie [mailto:[EMAIL PROTECTED] Sent: 17 June 2003 12:37To: '[EMAIL PROTECTED]'Subject: RE: [JBoss-user] EJB reference to external EJB Ok. That works. Thanks Dan. Now l am using remote interfaces between applications in the same VM. In this situation l want the performance benefits of using local interfaces. Ive had a look in the EJB spec and there doesnt seem to be anything in there to say an application cant have a local ref to an EJB in another application in the same VM. Im assuming the ejb-link element is available as a convenience. Is anyone able to provide some ejb-jar.xml and jboss.xml that shows an EJB in one application with a local ref to an EJB in another application in the same VM? Thanks. -Original Message-From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Sent: Tuesday, June 17, 2003 10:31 AMTo: [EMAIL PROTECTED]Subject: RE: [JBoss-user] EJB reference to external EJB Hi, I would guess you should be using a remote reference, not a local reference. Rgds, Dan. -- Danny Yates -Original Message-From: Burns, Jamie [mailto:[EMAIL PROTECTED] Sent: 16 June 2003 17:33To: [EMAIL PROTECTED]Subject: [JBoss-user] EJB reference to external EJB Im trying to link an EJB to an EJB deployed in another application within JBoss. JBoss Administration and Developement (2nd Ed) says under "EJB References with jboss.xml and jboss-web.xml" (pg 110 of Naming on JBoss...) "The ejb-link element cannot be used to refer to EJB's in another enterprise application. If your ejb-ref needs to access an external EJB, you can specify the jndi name of the deployed EJB home using the jboss.xml ejb-ref/jndi-name element" So l have used the following in jboss.xml entity ejb-nameHistoryEntity/ejb-namejndi-nameHistoryEntityRemoteHome/jndi-namelocal-jndi-nameHistoryEntityLocalHome/local-jndi-nameejb-local-ref ejb-local-ref-nameejb/SequenceSession/ejb-local-ref-namejndi-nameSequenceSessionLocalHome/jndi-name/ejb-local-ref /entity In my ejb-jar.xml l have entity ejb-nameHistoryEntity/ejb-name ... ejb-local-ref ejb-ref-nameejb/SequenceSession/ejb-ref-nameejb-ref-typeSession/ejb-ref-typelocal-homecom.newellandbudge.commons.ejb.common.SequenceSessionLocalHome/local-homelocalcom.newellandbudge.commons.ejb.common.SequenceSessionLocal/local/ejb-local-ref /entity The SequenceSession EJB is defined in the jboss.xml and ejb-jar.xml of another EAR as [jboss.xml] session ejb-nameSequenceSession/ejb-namejndi-nameSequenceSessionRemoteHome/jndi-namelocal-jndi-nameSequenceSessionLocalHome/local-jndi-name /session [ejb-jar.xml] session ejb-nameSequenceSession/ejb-name homecom.newellandbudge.commons.ejb.common.SequenceSessionRemoteHome/home remotecom.newellandbudge.commons.ejb.common.SequenceSessionRemote/remote local-homecom.newellandbudge.commons.ejb.common.SequenceSessionLocalHome/local-home localcom.newellandbudge.commons.ejb.common.SequenceSessionLocal/local ejb-classcom.newellandbudge.commons.ejb.SequenceSessionBean/ejb-class session-typeStateless/session-type .../session When the EAR with HistoryEntity is deployed l get following DeploymentException 16:48:23,812 WARN [ServiceController] Problem starting service jboss.j2ee:jndiName=HistoryEntityRemoteHome,service=EJBorg.jboss...deployment.DeploymentException: Local references currently require ejb-link at org.jboss.ejb.Container.setupEnvironment(Container.java:876) at org.jboss.ejb.Container.startService(Container.java:568) at org.jboss.ejb.EntityContainer.startService(EntityContainer.java:325) at org.jboss.system.ServiceMBeanSupport.start(ServiceMBeanSupport.java:192) 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.in
