EJB3 Glassfish JNDI lookup

问题:

I am using Glassfish-bundled Eclipse IDE. I wrote a simple EJB application. but it doesn't work.

@Stateless
@Remote(CalculatorRemote.class) 
@Local(CalculatorLocal.class) 
public class Calculator implements CalculatorRemote, CalculatorLocal {
    @Override
    public String sayHello(String name) {
        System.out.println("ejb:"+name);
        return null;
    }
}

----

@Remote
public interface CalculatorRemote {
    public String sayHello(String name);

}
-------

@Local
public interface CalculatorLocal {
    public String sayHello(String name);
}

I wrote a standalone client to test, but failed. can't find JNDI.

public class Main {

    public static void main(String[] args) throws Exception {        
        InitialContext ctx = new InitialContext();      
        CalculatorRemote bean = (CalculatorRemote) ctx.lookup("java:global/TestEAR/TEjb/Calculator!com.CalculatorRemote");
        bean.sayHello("Billy Bob");

    }

}

In the server log, it said

INFO: Portable JNDI names for EJB Calculator : [java:global/TestEAR/TEjb/Calculator!com.CalculatorRemote, java:global/TestEAR/TEjb/Calculator!com.CalculatorLocal]
INFO: Glassfish-specific (Non-portable) JNDI names for EJB Calculator : [com.CalculatorRemote, com.CalculatorRemote#com.CalculatorRemote]

Also, I have tried

ctx.lookup("com.CalculatorRemote")

still doesn't work.

error message is

java.lang.NullPointerException
    at com.sun.enterprise.naming.impl.SerialContext.getRemoteProvider(SerialContext.java:297)
    at com.sun.enterprise.naming.impl.SerialContext.getProvider(SerialContext.java:271)
    at com.sun.enterprise.naming.impl.SerialContext.lookup(SerialContext.java:430)
    at javax.naming.InitialContext.lookup(InitialContext.java:392)
    at com.Main.main(Main.java:9)
Exception in thread "main" javax.naming.NamingException: Lookup failed for 'java:global/TestEAR/TEjb/Calculator!com.CalculatorRemote' in SerialContext  [Root exception is javax.naming.NamingException: Unable to acquire SerialContextProvider for SerialContext  [Root exception is java.lang.NullPointerException]]
    at com.sun.enterprise.naming.impl.SerialContext.lookup(SerialContext.java:442)
    at javax.naming.InitialContext.lookup(InitialContext.java:392)
    at com.Main.main(Main.java:9)
Caused by: javax.naming.NamingException: Unable to acquire SerialContextProvider for SerialContext  [Root exception is java.lang.NullPointerException]
    at com.sun.enterprise.naming.impl.SerialContext.getProvider(SerialContext.java:276)
    at com.sun.enterprise.naming.impl.SerialContext.lookup(SerialContext.java:430)
    ... 2 more
Caused by: java.lang.NullPointerException
    at com.sun.enterprise.naming.impl.SerialContext.getRemoteProvider(SerialContext.java:297)
    at com.sun.enterprise.naming.impl.SerialContext.getProvider(SerialContext.java:271)
    ... 3 more

Please help me.

回答1:

Can you just add the above lines:

  Properties props = new Properties();
 props.put(Context.INITIAL_CONTEXT_FACTORY, "com.sun.enterprise.naming.SerialInitContextFactory");
 props.setProperty("org.omg.CORBA.ORBInitialHost", "localhost");
 // glassfish default port value will be 3700,
props.setProperty("org.omg.CORBA.ORBInitialPort", "3700");
InitialContext ctx = new InitialContext(props);

 CalculatorRemote bean = (CalculatorRemote) ctx.lookup("java:global/TestEAR/TEjb/Calculator!    com.CalculatorRemote");

I have created a blog post here using EJB3x with Glassfish v3. http://anirbanchowdhury.wordpress.com/2012/06/07/ejb-3-application-in-glassfish-3x/

回答2:

I think that exception is thrown because you didn't configure the initial context properly. Either create a jndi.properties file, or create a hash table with the properties and it send it to the constructor of IntialContext.

Creating EJB3 using Netbeans and Glassfish

回答3:

Just today I had an issue with this. Your standalone client failed but it will work inside GF EJB container.

For client testing you need 2 things to make it work:

1. from GlassFish_install_folder\glassfish\lib get javaee, gf-client and appserv-rt jars. the last one contains jndi.prop so you could use default c-tor InitialContext();
2. from GlassFish_install_folder\glassfish\modules get all jars.

These jars need to be in your classpath. It is silly but I don`t know yet the minimum jars from 2) in order to make it work.

回答4:

Solution is as below.

In the code below, You have to call a bean in another JVM Right ? For ex, your main class is in JRE and BEAN is in Glassfish JVM.

• The code is partially right. But more coded is needed to your class..

• Go through this link, complete example you can follow.

• Accessing a stateless EJB from another instance of Glassfish

public class Main {

    public static void main(String[] args) throws Exception {        
        InitialContext ctx = new InitialContext();      
        CalculatorRemote bean = (CalculatorRemote) ctx.lookup("java:global/TestEAR/TEjb/Calculator!com.CalculatorRemote");
        bean.sayHello("Billy Bob");
    }
}