添加接口(本地和远程)时无法运行ejb应用程序

使用环境

Netbeans 8.0 +

glassfish 4 +jdk 1.8

远端接口

package packt;
import javax.ejb.Remote;
@Remote
public interface SphereBeanRemote {
     public double computeVolume(double radius);
}

上述接口的实现

package packt;
import javax.ejb.Stateless;
@Stateless
public class SphereBean implements SphereBeanRemote {
    @Override
    public double computeVolume(double radius) {
         return (4.0/3.0)*Math.PI*(radius*radius*radius);
    }

}

访问它的客户端(servlet)

import java.io.*;
import javax.ejb.EJB;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.*;
import packt.SphereBean;
@WebServlet(urlPatterns = {"/SphereServlet"})
public class SphereServlet extends HttpServlet {
    @EJB
    SphereBean sphere;
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        try (PrintWriter out = response.getWriter()) {
            out.println("<!DOCTYPE html>");
            out.println("<html>");
            out.println("<head>");
            out.println("<title>Servlet SphereServlet</title>");            
            out.println("</head>");
            out.println("<body>");
            out.println("<h1>Servlet SphereServlet at " + request.getContextPath() + "</h1>");
            out.println("<h1>" + sphere.computeVolume(18)  + "</h1>");
            out.println("</body>");
            out.println("</html>");
        }
    }
      @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }
      @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }
    @Override
    public String getServletInfo() {
        return "Short description";
    }
}

误差

HTTP状态500 -内部服务器错误

type Exception report

messageInternal Server Error

服务器遇到内部错误，无法完成此请求。

异常

javax.servlet。ServletException:实例化servlet类SphereServlet出错

根源

com.sun.enterprise.container.common.spi.util.InjectionException:为类SphereServlet创建管理对象时出错

根源

com.sun.enterprise.container.common.spi.util.InjectionException:试图注入远程ejb的异常-ref name=SphereServlet/sphere,Remote 3。. x interface =packt. spherebean,ejb-link=null,lookup=，mappedName=，jndi-name=packt。在SerialContext[myEnv={java.naming.factory.initial=com.sun.enterprise.naming.impl. myEnv]中，会话到类SphereServlet:查找'java:comp/env/SphereServlet/sphere'失败。SerialInitContextFactory java.naming.factory.state = com.sun.corba.ee.impl.presentation.rmi。JNDIStateFactoryImpl java.naming.factory.url.pkgs = com.sun.enterprise.naming}

根源

javax.naming。NamingException:在SerialContext中查找'java:comp/env/SphereServlet/sphere'失败[myEnv={java.naming.factory.initial=com.sun.enterprise.naming.impl。SerialInitContextFactory java.naming.factory.state = com.sun.corba.ee.impl.presentation.rmi。JNDIStateFactoryImpl java.naming.factory.url.pkgs = com.sun.enterprise。[根异常是javax.naming.NamingException:异常解析Ejb为'Remote Ejb -ref name=SphereServlet/sphere,Remote 3。. x interface =packt. spherebean,ejb-link=null,lookup=，mappedName=，jndi-name=packt。SphereBean refType =会话"。用于查找的实际(可能是内部的)远程JNDI名称是"packt. spherebean #packt"。SphereBean'[根异常是javax.naming.NamingException:查找失败的包。SphereBean#包。[myEnv={java.naming.factory.initial=com.sun.enterprise.naming.impl.]SerialInitContextFactory java.naming.factory.state = com.sun.corba.ee.impl.presentation.rmi。JNDIStateFactoryImpl java.naming.factory.url.pkgs = com.sun.enterprise。[根异常是javax.naming.NameNotFoundException: packt. spherebean #packt。SphereBean未找到[]]

根源

javax.naming。NamingException:为"远程Ejb -ref name=SphereServlet/sphere,Remote"解析Ejb的异常。. x interface =packt. spherebean,ejb-link=null,lookup=，mappedName=，jndi-name=packt。SphereBean refType =会话"。用于查找的实际(可能是内部的)远程JNDI名称是"packt. spherebean #packt"。SphereBean'[根异常是javax.naming.NamingException:查找失败的包。SphereBean#包。[myEnv={java.naming.factory.initial=com.sun.enterprise.naming.impl.]SerialInitContextFactory java.naming.factory.state = com.sun.corba.ee.impl.presentation.rmi。JNDIStateFactoryImpl java.naming.factory.url.pkgs = com.sun.enterprise。[根异常是javax.naming.NameNotFoundException: packt. spherebean #packt。SphereBean未找到[]

根源

javax.naming。NamingException:查找'packt. spherebean #packt失败。[myEnv={java.naming.factory.initial=com.sun.enterprise.naming.impl.]SerialInitContextFactory java.naming.factory.state = com.sun.corba.ee.impl.presentation.rmi。JNDIStateFactoryImpl java.naming.factory.url.pkgs = com.sun.enterprise。[根异常是javax.naming.NameNotFoundException: packt. spherebean #packt。SphereBean未找到]

根源

javax.naming。NameNotFoundException: packt.SphereBean # packt。SphereBean未找到

在GlassFish Server开源版4.1日志中可以找到异常的完整堆栈跟踪及其根本原因。GlassFish Server开源版4.1

规范第4.9.8节规定:

下面是公开无接口视图的会话bean的要求:

bean类必须通过其bean类定义或在部署描述符中指定它公开无接口视图。以下规则适用:

如果bean不公开任何其他客户端视图(本地、远程、无接口)，则2。2.远程家庭x Local Home, Web Service)及其implements子句为空，则bean定义无接口视图。

如果bean至少公开一个其他客户端视图，则bean通过bean类上的LocalBean注释或在部署描述符中指定它公开一个无接口视图。

因此，改变你的实现:

package packt;
import javax.ejb.Stateless;
import javax.ejb.LocalBean;
@LocalBean
@Stateless
public class SphereBean implements SphereBeanRemote {
    @Override
    public double computeVolume(double radius) {
         return (4.0/3.0)*Math.PI*(radius*radius*radius);
    }
}

应该可以满足你的要求。

但是，如果你想实际使用Local/Remote接口，那么在注入时就应该使用这种类型:

@WebServlet(urlPatterns = {"/SphereServlet"})
public class SphereServlet extends HttpServlet {
    @EJB
    SphereBeanRemote sphere;
    ...

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