如何进行从瘦客户端到WebSphere Liberty的远程EJB调用

编程问答 2022-06-09

问题描述

我正在尝试从瘦客户机向WebSphere Liberty 20.0.0.10（JDK 8）进行远程EJB 3调用。客户端不在EJB容器中运行。我在此页面上进行了搜索，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绑定到以下地址：

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而不会出现问题。我尝试使用此字符串远程查找它：

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）

尽管它不会在应用程序中引起异常，但是我还是会在日志中收到此错误。

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

该地址似乎是正确的，因为如果更改端口，则会收到“连接被拒绝”的信息，如果更改Bean名称，则会出现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，我得到的null毫无例外。现在我想知道我在做什么错。尽管这是EJB 3应用程序，但是我仍需要某种EJB存根吗？

附录：实际上，我们正在进行从WebSphere传统到WebSphere Liberty的迁移，我认为我们可以摆脱运行createEJBStubs的麻烦，因为它运行缓慢（使用maven插件）并且需要WAS传统安装（不适用于Mac） ）。现在，我尝试使用createEJBStubs，并进行了进一步的研究。首先，我必须将com.ibm.websphere.javaee.ejb.3.2_1.0.45.jar添加到类路径。之后，事情会进一步发展。我可以获取EJB，但是第一次使用它会失败，但会出现一个熟悉的异常：

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怎么做。每当检索到EJB时，相同的异常仍会出现在日志中，但是在那种情况下，它似乎被静默消耗了。我想知道为什么例外中有端口0 ...

解决方法

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

对于瘦客户端，无论使用2.x还是3.x API，所有EJB远程接口都需要一个Stub。对于EJB 2.x，可以将RMIC与-iiop选项一起使用。对于EJB 3.x（在此使用），您需要使用WebSphere传统提供的createEJBStubs命令：

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

createEJBStubs也可以用于EJB 2.x远程接口。

请注意，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端进程（即胖客户端）中会为您生成一个Stub。有关应用程序客户端的更多信息，请参见：

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CORBAObjectImpl，并且缩小方法不起作用，因此看来至少部分原因是缺少Stub类。

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