在EJB本地调用出现的一个异常，求助解决，在线等待，谢谢

Question

不知道你用的时候什么 部属服务器。要设置一些属性值
weblogic的：
private InitialContext getContext() throws NamingException {
Hashtable props = new Hashtable();props.put(
InitialContext.INITIAL_CONTEXT_FACTORY,
"weblogic.jndi.WLInitialContextFactory");
props.put(InitialContext.PROVIDER_URL, "t3://127.0.0.1:7001");// This establishes the security for authorization/authentication
props.put(InitialContext.SECURITY_PRINCIPAL,"username");
props.put(InitialContext.SECURITY_CREDENTIALS,"password");InitialContext initialContext = new InitialContext(props);
return initialContext;
}

Answer 1

jboss的。Hashtable env = new Hashtable();
　　env.put(Context.INITIAL_CONTEXT_FACTORY,"org.jnp.interfaces.NamingContextFactory");
　　env.put(Context.PROVIDER_URL, "localhost:1099");
　　env.put("java.naming.factory.url.pkgs","org.jboss.naming:org.jnp.interfaces");
　　try
　　{
　　　Context ctx = new InitialContext(env);
　　　Object obj = ctx.lookup( "HelloWorld" );
　　　HelloWorldHome home =(HelloWorldHome)javax.rmi.PortableRemoteObject.narrow(
obj, HelloWorldHome.class );
　　　HelloWorld helloWorld = home.create();
　　　System.out.println( helloWorld.hello());
　　　helloWorld.remove();
　　}
　　catch ( Exception e )
　　{
　　　e.printStackTrace();
　　　System.out.println( "Exception: " + e.getMessage() );
　　}

Answer 2

我用的是weblogic，我马上按照你的方法试试看，先谢了

Answer 3

我这样写的
public class ConverterClient {    public static void main(String[] args) throws Exception{
        try {
            Context initial = new InitialContext();
            
            Properties environment= null;
            environment.setProperty(Context.INITIAL_CONTEXT_FACTORY,
                               "weblogic.jndi.WLInitialContextFactory");
            environment.setProperty(Context.PROVIDER_URL, "t3://localhost:7001");
            environment.put(InitialContext.SECURITY_PRINCIPAL,"weblogic");
           environment.put(InitialContext.SECURITY_CREDENTIALS,"PASSWORD");
            initial=new InitialContext(environment);
            Object objref = initial.lookup("MyConverter");
            HelloHome home =
                    (HelloHome) PortableRemoteObject.narrow(objref,
                    HelloHome.class);            Hello currencyConverter = home.create();            double amount = currencyConverter.dollarToYen(100.00);
            System.out.println(amount);
            amount = currencyConverter.yenToEuro(100.00);
            System.out.println(amount);            currencyConverter.remove();        } catch (Exception ex) {
            System.err.println("Caught an unexpected exception!");
            ex.printStackTrace();
        }
    }
}

Answer 4

问题出现了，当运行到environment.setProperty(Context.INITIAL_CONTEXT_FACTORY,
                               "weblogic.jndi.WLInitialContextFactory");
的时候就抛出了NullPointerException空指针的异常，我晕了

Answer 5

你这样写：
public static void main(String[] args) throws Exception{
        try {
            Context initial = new InitialContext();
            
            properties = new Properties();
            environment.put(Context.INITIAL_CONTEXT_FACTORY,
                               "weblogic.jndi.WLInitialContextFactory");
            environment.put(Context.PROVIDER_URL, "t3://localhost:7001");
            environment.put(InitialContext.SECURITY_PRINCIPAL,"weblogic");
           environment.put(InitialContext.SECURITY_CREDENTIALS,"PASSWORD");
            initial=new InitialContext(environment);

Answer 6

environment 改成properties 前面注意声明

Answer 7

我这样写了之后就没报错了：
public class ConverterClient {    public static void main(String[] args) throws Exception {
        try {
               InitialContext initial= getContext();
           Object objref = initial.lookup("MyConverter");
            HelloHome home =
                    (HelloHome) PortableRemoteObject.narrow(objref,
                    HelloHome.class);            Hello currencyConverter = home.create();            double amount = currencyConverter.dollarToYen(100.00);
            System.out.println(amount);
            amount = currencyConverter.yenToEuro(100.00);
            System.out.println(amount);            currencyConverter.remove();        } catch (Exception ex) {
            System.err.println("Caught an unexpected exception!");
            ex.printStackTrace();
        }
    }    private static InitialContext getContext() throws NamingException {
        Hashtable props = new Hashtable();        props.put(
                InitialContext.INITIAL_CONTEXT_FACTORY,
                "weblogic.jndi.WLInitialContextFactory");
        props.put(InitialContext.PROVIDER_URL, "t3://127.0.0.1:7001");// This establishes the security for authorization/authentication
        props.put(InitialContext.SECURITY_PRINCIPAL, "weblogic");
        props.put(InitialContext.SECURITY_CREDENTIALS, "PASSWORD");        InitialContext initialContext = new InitialContext(props);
        return initialContext;
    }}