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我正在尝试使用我发现的示例开发我的第一个 EJB，但我遇到了下一个错误：

Exception in thread "main" java.lang.IllegalStateException: No EJB receiver available for handling [appName:,modulename:HelloWorldSessionBean,distinctname:] combination for invocation context org.jboss.ejb.client.EJBClientInvocationContext@41408b80
at org.jboss.ejb.client.EJBClientContext.requireEJBReceiver(EJBClientContext.java:584)
at org.jboss.ejb.client.ReceiverInterceptor.handleInvocation(ReceiverInterceptor.java:119)
at org.jboss.ejb.client.EJBClientInvocationContext.sendRequest(EJBClientInvocationContext.java:181)
at org.jboss.ejb.client.EJBInvocationHandler.doInvoke(EJBInvocationHandler.java:136)
at org.jboss.ejb.client.EJBInvocationHandler.doInvoke(EJBInvocationHandler.java:121)
at org.jboss.ejb.client.EJBInvocationHandler.invoke(EJBInvocationHandler.java:104)
at $Proxy0.sayHello(Unknown Source)
at com.ibytecode.client.EJBApplicationClient.main(EJBApplicationClient.java:16)

我用的是JBOSS 7.1，代码是这样的：HelloWorld.java package com.ibytecode.business；

import javax.ejb.Remote;

@Remote
public interface HelloWorld {

    public String sayHello();


}

HelloWorldBean.java 包 com.ibytecode.businesslogic；

import com.ibytecode.business.HelloWorld;
import javax.ejb.Stateless;

/**
 * Session Bean implementation class HelloWorldBean
 */
@Stateless
public class HelloWorldBean implements HelloWorld {

/**
 * Default constructor. 
 */
public HelloWorldBean() {
}

public String sayHello() {
    return "Hello World !!!";
}

}

EJBApplicationClient.java：

package com.ibytecode.client;

import javax.naming.Context;
import javax.naming.NamingException;

import com.ibytecode.business.HelloWorld;
import com.ibytecode.businesslogic.HelloWorldBean;
import com.ibytecode.clientutility.ClientUtility;

public class EJBApplicationClient {

public static void main(String[] args) {
    // TODO Auto-generated method stub

    HelloWorld bean = doLookup();
    System.out.println(bean.sayHello()); // 4. Call business logic

}

 private static HelloWorld doLookup() {
        Context context = null;
        HelloWorld bean = null;
        try {
            // 1. Obtaining Context
            context = ClientUtility.getInitialContext();
            // 2. Generate JNDI Lookup name
            String lookupName = getLookupName();
            // 3. Lookup and cast
            bean = (HelloWorld) context.lookup(lookupName);

        } catch (NamingException e) {
            e.printStackTrace();
        }
        return bean;
    }


 private static String getLookupName() {
     /*
     The app name is the EAR name of the deployed EJB without .ear suffix.
     Since we haven't deployed the application as a .ear,
     the app name for us will be an empty string
     */
             String appName = "";

             /* The module name is the JAR name of the deployed EJB
             without the .jar suffix.
             */
             String moduleName = "HelloWorldSessionBean";

     /*AS7 allows each deployment to have an (optional) distinct name.
     This can be an empty string if distinct name is not specified.
     */
             String distinctName = "";

             // The EJB bean implementation class name
             String beanName = HelloWorldBean.class.getSimpleName();

             // Fully qualified remote interface name
             final String interfaceName = HelloWorld.class.getName();

             // Create a look up string name
             String name = "ejb:" + appName + "/" + moduleName + "/" +
                 distinctName    + "/" + beanName + "!" + interfaceName;

             return name;
         }


 }

ClientUtility.java 包 com.ibytecode.clientutility；

 import java.util.Properties;
 import javax.naming.Context;
 import javax.naming.InitialContext;
 import javax.naming.NamingException;

public class ClientUtility {

private static Context initialContext;

private static final String PKG_INTERFACES = "org.jboss.ejb.client.naming";

public static Context getInitialContext() throws NamingException {
    if (initialContext == null) {
        Properties properties = new Properties();
        properties.put("jboss.naming.client.ejb.context", true);
        properties.put(Context.URL_PKG_PREFIXES, PKG_INTERFACES);


        initialContext = new InitialContext(properties);
    }
    return initialContext;
}

}

属性文件：

remote.connectionprovider.create.options.org.xnio.Options.SSL_ENABLED=false

remote.connections=default

remote.connection.default.host=localhost
remote.connection.default.port = 4447
remote.connection.default.connect.options.org.xnio.Options.SASL_POLICY_NOANONYMOUS=false

这就是我所拥有的。为什么我有这个？非常感谢。问候

4

1 回答 1

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让我们尝试以下内容，我无法在评论中输入它，因为它很长。

似乎一切都很好，您也可以@Remote毫无问题地离开。我还将假设您获得了通往 EJB 的正确路径：如何检查它？

当您部署它时，您应该在服务器控制台中看到如下内容：

ejb:{app-Name}/{module-Name}/{distinct-Name}/{bean-Name}!{fullPath-remote-Interface}

EG：第一个是您感兴趣的（来自查找）

java:global/MyBankLogicEAR/MyBankLogic/Account!main.IAccount
java:app/MyBankLogic/Account!main.IAccount
java:module/Account!main.IAccount
java:jboss/exported/MyBankLogicEAR/MyBankLogic/Account!main.IAccount
java:global/MyBankLogicEAR/MyBankLogic/Account
java:app/MyBankLogic/Account
java:module/Account

我将尝试通过以下方式更改查找

final Hashtable jndiProperties = new Hashtable();
jndiProperties.put(Context.URL_PKG_PREFIXES, "org.jboss.ejb.client.naming");

try {
    final Context context = new InitialContext(jndiProperties);
    String appName = "";
    String moduleName = "jboss-firstbean";
    String distinctName = "";
    String beanName = "FirstBean";
    String interfaceFullName = "ejb.RemoteFirstBean";
    final String jndi = "ejb:" + appName + "/" + moduleName + "/" + distinctName + "/" + beanName + "!" + viewClassName;
    RemoteFirstBean statelessRemote = (RemoteFirstBean)context.lookup(jndi);
} catch (NamingException ex) {
    System.out.println("problems");
}

这取自Accessing remote EJB on JBoss AS 7.1 from web application，我还建议您检查同一页面中的第 5 步，以了解您是否需要在 jboss-ejb-client.properties 文件中配置其他属性。

于 2013-11-11T09:49:47.053 回答