EJB3 Glassfish JNDI查找

Question

我正在使用Glassfish捆绑的Eclipse IDE.我写了一个简单的EJB应用程序.但它不起作用.

@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);
}

我写了一个独立的客户端来测试,但失败了.找不到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");

    }

}

在服务器日志中,它说

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]

另外,我试过了

ctx.lookup("com.CalculatorRemote")

仍然无法正常工作.

错误信息是

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

请帮我.

Answer 1

我认为抛出异常是因为您没有正确配置初始上下文。创建一个 jndi.properties 文件，或者创建一个包含属性的哈希表，并将其发送到 IntialContext 的构造函数。

使用 Netbeans 和 Glassfish 创建 EJB3