我用以下代码创建了一个会话bean:
package ejb2;
import javax.annotation.Resource;
import javax.ejb.SessionContext;
import javax.ejb.Stateless;
@Stateless(name = "TestEJB", mappedName = "EJB2-Project1-TestEJB")
public class TestEJBBean implements TestEJB, TestEJBLocal {
@Resource
SessionContext sessionContext;
public TestEJBBean() {
}
public String getHello(String who_welcome) {
return "Hello " + who_welcome;
}
}
如您所见,它几乎是默认代码(getHello方法除外)。除了这个bean,我还有一个客户:
package ejb2;
import java.util.Hashtable;
import javax.naming.CommunicationException;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
public class TestEJBClient {
public static void main(String[] args) {
try {
final Context context = getInitialContext();
TestEJB testEJB = (TestEJB) context.lookup("EJB2-Project1-TestEJB#ejb2.TestEJB");
System.out.println(testEJB.getHello("Student"));
} catch (CommunicationException ex) {
System.out.println(ex.getClass().getName());
System.out.println(ex.getRootCause().getLocalizedMessage());
System.out.println("\n*** A CommunicationException was raised. This typically\n*** occurs when the target WebLogic server is not running.\n");
} catch (Exception ex) {
ex.printStackTrace();
}
}
private static Context getInitialContext() throws NamingException {
Hashtable env = new Hashtable();
// WebLogic Server 10.x/12.x connection details
env.put(Context.INITIAL_CONTEXT_FACTORY, "weblogic.jndi.WLInitialContextFactory");
env.put(Context.PROVIDER_URL, "t3://localhost:7101");
return new InitialContext(env);
}
}
第一次像魅力一样运作。但是后来我创建了另一个bean:
package ejb2;
import javax.annotation.Resource;
import javax.ejb.Stateless;
import javax.ejb.SessionContext;
import javax.naming.Context;
import javax.naming.InitialContext;
@Stateless(name = "ClientEJB", mappedName = "EJB2-Project1-ClientEJB")
public class ClientEJBBean implements ClientEJB, ClientEJBLocal {
@Resource
SessionContext sessionContext;
TestEJB testEJB;
public ClientEJBBean() {
try {
final Context context = new InitialContext();
testEJB = (TestEJB) context.lookup("EJB2-Project1-TestEJB#ejb2.TestEJB");
} catch (Exception ex) {
ex.printStackTrace();
}
}
public String getHelloFromBean(String who) {
return testEJB.getHello(who);
}
}
现在,豆子不起作用了。我收到这样的错误:
weblogic.application.ModuleException:无法将业务接口绑定到JNDI名称:EJB2Project1WebApp_warClientEJB_Home,引发异常javax.naming.NameAlreadyBoundException:[EJB:011224]无法将接口ejb2.ClientEJB绑定到ClientEJB。另一个EJB已经将接口绑定到该名称。其余名称为“ EJB2-Project1-ClientEJB#ejb2”。 NestedException消息为:[EJB:011224]无法将接口ejb2.ClientEJB绑定到ClientEJB。另一个EJB已经将接口绑定到该名称。
这些代码有什么问题?
最佳答案
据我所知,您尝试部署两个具有相同JNDI名称的无状态EJB
尝试取消部署当前应用程序,从管理控制台检查JNDI树
并确保树没有您看到的重复的JNDI名称。