如何从瘦客户端到WebSphere Liberty进行远程EJB调用

Question

我正在尝试从瘦客户端对WebSphere Liberty20.0.0.10（JDK 8）进行远程EJB 3调用。客户端不在EJB容器中运行。我谷歌了这个页面，并尝试按照说明进行操作：https://www.ibm.com/support/knowledgecenter/SSD28V_liberty/com.ibm.websphere.wlp.core.doc/ae/twlp_ejb_remote.html

根据服务器日志，EJB绑定到这个地址：

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

（代码服务器是应用程序的名称，只有一个包含 EJB 的 war 模块）

我可以在本地调用它，没有问题。我尝试用这个字符串远程查找它：

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

（IIOP服务在端口12809中）

不知怎的，我在日志中得到了这个错误，尽管它不会在应用程序中引起异常。

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

这个地址似乎是正确的，因为如果我更改端口，我会得到“连接被拒绝”，如果我更改bean名称，我会获得NameNotFoundException。

我得到一个com.sun.corba.se.impl.corba.CORBAObjectImpl的实例作为响应，但是当我使用PortableRemoteObject.narrow（）方法时，我毫无例外地得到null。现在我想知道我做错了什么。虽然这是EJB 3应用程序，但我需要某种EJB存根吗？

附录：实际上，我们正在做从传统 WebSphere 到 WebSphere Liberty 的迁移，我认为我们可以摆脱运行 createEJBStubs，因为它很慢（使用 maven 插件），并且需要 WAS 传统安装（这在 Mac 上不可用）。现在我尝试了创建EJB存根，并得到了进一步的了解。首先，我必须将 com.ibm.websphere.javaee.ejb.3.2_1.0.45.jar 添加到类路径中。在那之后，事情变得更远了。我可以获取 EJB，但第一次尝试使用它失败，并有一个熟悉的异常：

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

现在我不知道下一步该尝试什么。每当检索到EJB时，日志上仍然会出现相同的异常，但在这种情况下，它似乎被静默消耗了。我想知道为什么异常中有端口0…

Answer 1

WebSphere Liberty不提供EJB瘦客户端，但是，您可以使用WebSphere传统瘦客户端来访问WebSphere Liberty服务器：

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

对于瘦客户机，无论使用2.x还是3.x API，所有EJB远程接口都需要一个存根。对于EJB2.x，您可以使用带有-iiop选项的RMIC。对于EJB3.x（此处使用），您需要使用WebSphere traditional提供的createEJBStubs命令：

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

< code > createejb subs 也可以用于EJB 2.x远程接口。

请注意，存根是在启用了 ejbRemote-3.2 功能的 WebSphere 服务器进程中或在应用程序客户机进程（即胖客户机）中为您生成的。有关应用程序客户端的详细信息，请参阅此处：

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

由于您收到的是一个CORBAObjectImpl，并且窄的不起作用，因此似乎至少部分问题是缺乏Stub类。