CODEWITHSUNDEEP
javajakarta-eewebsphere-liberty
Ville-Matti Kiili
Ville-Matti Kiili

Reputation: 1

How to make remote EJB call from thin client to WebSphere Liberty

I'm trying to make a remote EJB 3 call from a thin client to WebSphere Liberty 20.0.0.10 (JDK 8). The client is not running in an EJB container. I googled this page and tried to follow the instructions: https://www.ibm.com/support/knowledgecenter/SSD28V_liberty/com.ibm.websphere.wlp.core.doc/ae/twlp_ejb_remote.html

According to the server log, the EJB is bound to this address:

CNTR0167I: The server is binding the fi.datawell.cs.ejb.logging.boundary.DW_CS_LoggingServices interface of the DW_CS_LoggingRemoteServicesBean enterprise bean in the codeserver.war module of the codeserver application.  The binding location is: java:global/codeserver/DW_CS_LoggingRemoteServicesBean!fi.datawell.cs.ejb.logging.boundary.DW_CS_LoggingServices

(codeserver is the name of the application, and there's only a single war module which contains the EJBs)

I can call it locally without problems. I try to look it up remotely with this string:

corbaname::localhost:12809#ejb/global/codeserver/DW_CS_LoggingRemoteServicesBean!fi\.datawell\.cs\.ejb\.logging\.boundary\.DW_CS_LoggingServices

(The IIOP service is in port 12809)

Somehow I get this error in the log, although it doesn't cause an exception in the application.

WARNING: "IOP00410201: (COMM_FAILURE) Connection failure: socketType: IIOP_CLEAR_TEXT; hostname: localhost; port: 0"
org.omg.CORBA.COMM_FAILURE:   vmcid: SUN  minor code: 201  completed: No
        at com.sun.corba.se.impl.logging.ORBUtilSystemException.connectFailure(ORBUtilSystemException.java:2200)
        at com.sun.corba.se.impl.logging.ORBUtilSystemException.connectFailure(ORBUtilSystemException.java:2221)
        at com.sun.corba.se.impl.transport.SocketOrChannelConnectionImpl.<init>(SocketOrChannelConnectionImpl.java:223)
        at com.sun.corba.se.impl.transport.SocketOrChannelConnectionImpl.<init>(SocketOrChannelConnectionImpl.java:236)
        at com.sun.corba.se.impl.transport.SocketOrChannelContactInfoImpl.createConnection(SocketOrChannelContactInfoImpl.java:119)
        at com.sun.corba.se.impl.protocol.CorbaClientRequestDispatcherImpl.beginRequest(CorbaClientRequestDispatcherImpl.java:187)
        at com.sun.corba.se.impl.protocol.CorbaClientDelegateImpl.request(CorbaClientDelegateImpl.java:137)
        at com.sun.corba.se.impl.protocol.CorbaClientDelegateImpl.is_a(CorbaClientDelegateImpl.java:229)
        at org.omg.CORBA.portable.ObjectImpl._is_a(ObjectImpl.java:130)
        at org.omg.CosNaming.NamingContextHelper.narrow(NamingContextHelper.java:69)
        at com.sun.jndi.cosnaming.CNCtx.callResolve(CNCtx.java:504)
        at com.sun.jndi.cosnaming.CNCtx.lookup(CNCtx.java:555)
        at com.sun.jndi.toolkit.url.GenericURLContext.lookup(GenericURLContext.java:205)
        at javax.naming.InitialContext.lookup(InitialContext.java:417)
        at fi.datawell.cs.ejb.DW_CS_EjbFactory.lookupService(DW_CS_EjbFactory.java:91)
        at fi.datawell.cs.ejb.DW_CS_EjbFactory.lookupLoggingRemoteServicesEJB(DW_CS_EjbFactory.java:284)
        at fi.datawell.cs.application.clients.versionloader.DW_CS_VersionLoaderWorker.fetchClientServices(DW_CS_VersionLoaderWorker.java:983)
        at fi.datawell.cs.application.clients.versionloader.DW_CS_VersionLoader.initialize(DW_CS_VersionLoader.java:114)
        at fi.datawell.cs.application.clients.versionloader.DW_CS_VersionLoader.main(DW_CS_VersionLoader.java:252)
Caused by: java.net.BindException: Cannot assign requested address: connect
        at sun.nio.ch.Net.connect0(Native Method)
        at sun.nio.ch.Net.connect(Net.java:454)
        at sun.nio.ch.Net.connect(Net.java:446)
        at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
        at java.nio.channels.SocketChannel.open(SocketChannel.java:189)
        at com.sun.corba.se.impl.transport.DefaultSocketFactoryImpl.createSocket(DefaultSocketFactoryImpl.java:95)
        at com.sun.corba.se.impl.transport.SocketOrChannelConnectionImpl.<init>(SocketOrChannelConnectionImpl.java:207)
        ... 16 more

This address seems to be correct, because if I change the port, I get "connection refused" and if I change the bean name, I get NameNotFoundException.

I get an instance of com.sun.corba.se.impl.corba.CORBAObjectImpl as response, but when I use PortableRemoteObject.narrow() method, I get null without any exception. Now I wonder what I'm doing wrong. Do I need some kind of EJB stubs although this is EJB 3 application?

Addendum: Actually we are doing a migration from WebSphere traditional to WebSphere Liberty and I thought we could get rid of running createEJBStubs, because it is slow (using maven plugin) and requires WAS traditional installation (which isn't available for Mac). Now I tried with createEJBStubs and got a bit further. First I had to add com.ibm.websphere.javaee.ejb.3.2_1.0.45.jar to classpath. After that things get a bit further. I can fetch the EJB, but the first attempt to use it fails with a familiar exception:

javax.ejb.EJBException: nested exception is: java.rmi.MarshalException: CORBA COMM_FAILURE 1398079689 No; nested exception is: 
    org.omg.CORBA.COMM_FAILURE:   vmcid: SUN  minor code: 201  completed: No
    at fi.datawell.cs.ejb.logging.boundary._DW_CS_LoggingServices_Stub.log(_DW_CS_LoggingServices_Stub.java:1101)
    at fi.datawell.cs.application.clients.core.DW_CS_BaseWorker.writeCodeServerLog(DW_CS_BaseWorker.java:66)
    at fi.datawell.cs.application.clients.versionloader.DW_CS_VersionLoader.initialize(DW_CS_VersionLoader.java:120)
    at fi.datawell.cs.application.clients.versionloader.DW_CS_VersionLoader.main(DW_CS_VersionLoader.java:252)
Caused by: java.rmi.MarshalException: CORBA COMM_FAILURE 1398079689 No; nested exception is: 
    org.omg.CORBA.COMM_FAILURE:   vmcid: SUN  minor code: 201  completed: No
    at com.sun.corba.se.impl.javax.rmi.CORBA.Util.mapSystemException(Util.java:219)
    at javax.rmi.CORBA.Util.mapSystemException(Util.java:95)
    at fi.datawell.cs.ejb.logging.boundary._DW_CS_LoggingServices_Stub.log(_DW_CS_LoggingServices_Stub.java:1)
    ... 3 more
Caused by: org.omg.CORBA.COMM_FAILURE:   vmcid: SUN  minor code: 201  completed: No
    at com.sun.corba.se.impl.logging.ORBUtilSystemException.connectFailure(ORBUtilSystemException.java:2200)
    at com.sun.corba.se.impl.logging.ORBUtilSystemException.connectFailure(ORBUtilSystemException.java:2221)
    at com.sun.corba.se.impl.transport.SocketOrChannelConnectionImpl.<init>(SocketOrChannelConnectionImpl.java:223)
    at com.sun.corba.se.impl.transport.SocketOrChannelConnectionImpl.<init>(SocketOrChannelConnectionImpl.java:236)
    at com.sun.corba.se.impl.transport.SocketOrChannelContactInfoImpl.createConnection(SocketOrChannelContactInfoImpl.java:119)
    at com.sun.corba.se.impl.protocol.CorbaClientRequestDispatcherImpl.beginRequest(CorbaClientRequestDispatcherImpl.java:187)
    at com.sun.corba.se.impl.protocol.CorbaClientDelegateImpl.request(CorbaClientDelegateImpl.java:137)
    at org.omg.CORBA.portable.ObjectImpl._request(ObjectImpl.java:449)
    at fi.datawell.cs.ejb.logging.boundary._DW_CS_LoggingServices_Stub.log(_DW_CS_LoggingServices_Stub.java)
    ... 3 more
Caused by: java.net.BindException: Cannot assign requested address: connect
    at sun.nio.ch.Net.connect0(Native Method)
    at sun.nio.ch.Net.connect(Net.java:454)
    at sun.nio.ch.Net.connect(Net.java:446)
    at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)
    at java.nio.channels.SocketChannel.open(SocketChannel.java:189)
    at com.sun.corba.se.impl.transport.DefaultSocketFactoryImpl.createSocket(DefaultSocketFactoryImpl.java:95)
    at com.sun.corba.se.impl.transport.SocketOrChannelConnectionImpl.<init>(SocketOrChannelConnectionImpl.java:207)
    ... 9 more

Now I don't know what to try next. The same exception still appears on log whenever the EJB is retrieved, but in that situation it seems to be silently consumed. I wonder why there is port 0 in the exception...

Upvotes: 0

Views: 1282

Answers (1)

Tracy
Tracy

Reputation: 1073

WebSphere Liberty does not provide an EJB thin client, however, you may use the WebSphere traditional thin client to access a WebSphere Liberty server:

https://www.ibm.com/support/knowledgecenter/SSAW57_8.5.5/com.ibm.websphere.nd.multiplatform.doc/ae/tcli_ejbthinclient.html

For a thin client, all EJB remote interfaces require a Stub, whether using the 2.x or 3.x APIs. For EJB 2.x, you could use RMIC with the -iiop option. For EJB 3.x (that is being used here), you need to use the createEJBStubs command provided by WebSphere traditional :

https://www.ibm.com/support/knowledgecenter/en/SSEQTP_8.5.5/com.ibm.websphere.base.doc/ae/rejb_3stubscmd.html

createEJBStubs may also be used for EJB 2.x remote interfaces as well.

Note that a Stub is generated for you in a WebSphere server process that has the ejbRemote-3.2 feature enabled or in an application client process (i.e. thick client). More information about the application client is here:

https://www.ibm.com/support/knowledgecenter/SSEQTP_liberty/com.ibm.websphere.wlp.doc/ae/twlp_setup_prepareappclient.html

Since you are receiving a CORBAObjectImpl, and the narrow does not work, it would seem that at least part of the problem is the lack of Stub classes.

Upvotes: 1

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