EJB3 客户端查找

Question

我试图从独立的 Java 客户端调用 EJB，得到以下错误。

查找代码

String localJNDIName = "ejbremote:gcmsnew/gcmsutilbeans.jar/CustomerSurveyManageQstBean#com.smbcgroup.gcms.utility.bl.survey.CustomerSurveyManageQstRemote";
InitialContext ic = new InitialContext();
GCMSBaseRemote bean = (GCMSBaseRemote)ic.lookup(localJNDIName);

例外

javax.naming.ConfigurationException: NamingManager.getURLContext 找不到该方案的工厂：ejbremote at com.ibm.ws.naming.jndicos.CNContextImpl.checkForUrlContext(CNContextImpl.java:471) 在 com.ibm.ws.naming.util.WsnInitCtx.lookup(WsnInitCtx.java:160) 在 com.ibm.ws.naming.util.WsnInitCtx.lookup(WsnInitCtx.java:179) 在 javax.naming.InitialContext.lookup（未知来源）在 com.test.EJBClientTest.main(EJBClientTest.java:18)

环境

RAD 7.5，EJB3。 Websphere 应用服务器 7.0。

Answer 1

WebSphere Application Server 中不存在 ejbremote 方案（即使“ejblocal”确实存在）。尝试使用 ejb/ 前缀代替 ejbremote:。

有关详细信息，请参阅信息中心中的 EJB application bindings overview 主题。

Answer 2

您需要有存根文件来调用 EJB，所以首先生成存根文件。在 websphere 中，appserver bin 文件夹 createEJBStubs 中有可用的实用程序。

Answer 3

由于这是一个独立的（“瘦”）客户端，您可能应该尝试这样的操作：

   Properties properties = new Properties();
   properties.setProperty(Context.INITIAL_CONTEXT_FACTORY,"com.ibm.websphere.naming.WsnInitialContextFactory");
   properties.setProperty(Context.PROVIDER_URL,"corbaloc:iiop:localhost:2809"); //localhost=the host where your EJB is located, 2809=BOOTSTRAP_ADDRESS port
   Context initCtx = new InitialContext(properties);
   Object homeObject = initCtx.lookup("com.smbcgroup.gcms.utility.bl.survey.CustomerSurveyManageQstRemote"); //by default the JNDI name of your Remote Interface is its full class name
   // Narrow to a real object
   csmo = (CustomerSurveyManageQstRemote) javax.rmi.PortableRemoteObject.narrow(homeObject, com.smbcgroup.gcms.utility.bl.survey.CustomerSurveyManageQstRemote.class);

为了进行上述调用，您的类路径中还应该有适当的 Websphere Jars。

Answer 4

用于远程查找

import java.io.IOException;
import java.util.Hashtable;  
import javax.naming.InitialContext;
import javax.naming.NamingException;

public class ServiceLocator {
    static String url = "corbaloc:iiop:localhost:2809";
    static String initial = "com.ibm.websphere.naming.WsnInitialContextFactory";  
    static String jndi = "ejb/enterprise_app_name/ejb_web_project_name.jar/ejb_name#name.of.remote.impl.interface";


    private static ServiceLocator serviceLocator = null;  

    InitialContext context = null;

    private ServiceLocator() throws NamingException, IOException { 

        Hashtable<String,String> env = new Hashtable<String,String> (); 
        env.put("java.naming.provider.url",  url ); 
        env.put("java.naming.factory.initial",  initial );
        context = new InitialContext(env);
    }

    public synchronized static ServiceLocator getInstance() throws NamingException, IOException {

        if (serviceLocator == null) {
            serviceLocator = new ServiceLocator(); 
        }

        return serviceLocator;
    }  

    public Object getService(String jndiName) throws NamingException {
        return context.lookup(jndiName); 
    }

    public <T>T getRemoteObject(Class<T> remoteInterfaceClass) {
        try {

            return (T)javax.rmi.PortableRemoteObject.narrow( context.lookup(jndi), remoteInterfaceClass);

        } catch (NamingException nexc) {

            nexc.printStackTrace(); 

        }
        return null;
    }

}

用于本地查找

import java.io.IOException;
import java.util.Hashtable;  
import javax.naming.InitialContext;
import javax.naming.NamingException;

public class ServiceLocator {
    static String url = "iiop://localhost";
    static String initial = "com.ibm.websphere.naming.WsnInitialContextFactory";  
    static String jndi = "ejblocal:enterprise_app_name/ejb_web_project_name.jar/ejb_name#name.of.local.impl.interface";



    private static ServiceLocator serviceLocator = null;  

    InitialContext context = null;

    private ServiceLocator() throws NamingException, IOException { 

        Hashtable<String,String> env = new Hashtable<String,String> (); 
        env.put("java.naming.provider.url",  url ); 
        env.put("java.naming.factory.initial",  initial );
        context = new InitialContext(env);
    }

    public synchronized static ServiceLocator getInstance() throws NamingException, IOException {

        if (serviceLocator == null) {
            serviceLocator = new ServiceLocator(); 
        }

        return serviceLocator;
    }  

    public Object getService(String jndiName) throws NamingException {
        return context.lookup(jndiName); 
    }

    public Object getService() throws NamingException {
        return context.lookup(jndi); 
    }

}