我正在使用 Glassfish 捆绑的 Eclipse IDE。我编写了一个简单的 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,我也尝试过
ctx.lookup("com.CalculatorRemote")
还是不行。
错误消息是
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。