Question

我是ejb3应用程序的新手我的项目是： ServletController.java

package controller;

import java.io.IOException;

import javax.naming.Context;
import javax.naming.InitialContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.HelloUser;

public class ServletController extends HttpServlet {

    @Override
    protected void service(HttpServletRequest arg0, HttpServletResponse arg1) throws ServletException, IOException {
        try {
            InitialContext Context = new InitialContext();
            Context context = new InitialContext();
            HelloUser helloUser = (HelloUser) context.lookup("ejb3/" + HelloUser.class.getSimpleName() + "/local");
            System.out.println(".................................");
            helloUser.sayHello("reza");
            arg1.sendRedirect("reza");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}

HelloUser.java：

package com;

import javax.ejb.Local;

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

HelloUserBean.java

package com;

import javax.ejb.Stateless;

@Stateless
public class HelloUserBean implements HelloUser {
    public HelloUserBean() {
    }

    public void sayHello(String name) {
        System.out.println("Hello " + name + " welcome to EJB 3!");
    }

}

的web.xml

<web-app id="WebApp_ID" version="2.4"
    xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee 
    http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">

    <display-name>Baharan-Framework</display-name>
    <welcome-file-list>
        <welcome-file>Index.jsp</welcome-file>
    </welcome-file-list>

    <servlet-mapping>
        <servlet-name>mvc-dispatcher</servlet-name>
        <url-pattern>/rest/*</url-pattern>
    </servlet-mapping>


    <servlet>
        <servlet-name>mvc-dispatcher</servlet-name>
        <servlet-class>controller.ServletController</servlet-class>
    </servlet>
</web-app>

当webbrowser调用ServletController时，会引发以下错误（URL为：http://localhost:7001/weblogic/rest/jkfg）：

javax.naming.NameNotFoundException: While trying to lookup 'ejb3.HelloUser/local' didn't find subcontext 'ejb3'. Resolved ''; remaining name 'ejb3/HelloUser/local'
    at weblogic.jndi.internal.BasicNamingNode.newNameNotFoundException(BasicNamingNode.java:1139)
    at weblogic.jndi.internal.BasicNamingNode.lookupHere(BasicNamingNode.java:247)

Answer 1

首先，Weblogic打印分配给每个Enterprise bean的所有jndi名称，您可以直接获取它。第二个，删除context.lookup（＆＃34; ejb3 /＆＃34; + HelloUser.class.getSimpleName（）+＆＃34; / local＆＃34;）;那么在简单的情况下，这个功能可以帮助你：

public static <T>T lookupBean(Class<T> beanClass) {
final String jndiName = "java:module/" + beanClass.getSimpleName();
        logger.info("lookup : {}", jndiName);

        try {
            T bean = InitialContext.doLookup(jndiName);
            logger.info("detected : {}", bean);
            return bean;
        }

        catch(NamingException e) {
            logger.error(e.getMessage(), e);
            return null;
        }

Answer 2

你能为我提供部署日志吗？而不是尝试使用@EJB注释的initialcontext查找。

context.lookup在weblogic

2 个答案: