添加界面（本地和远程）时无法运行ejb应用程序
使用的环境
Netbeans 8.0+
玻璃鱼4+
jdk 1.8
请注意，如果您使用无界面视图，则此示例运行良好。如果我们使用本地或远程界面，则效果不佳
远程接口
package packt;
import javax.ejb.Remote;
@Remote
public interface SphereBeanRemote {
public double computeVolume(double radius);
}
实现上述接口
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);
}
}
客户端（servlet）访问它
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";
}
}
错误 HTTP状态500 - 内部服务器错误
键入例外报告
messageInternal服务器错误
description服务器遇到一个内部错误，导致它无法完成此请求。
例外
javax.servlet.ServletException：实例化servlet类SphereServlet时出错
根本原因
com.sun.enterprise.container.common.spi.util.InjectionException：为类创建托管对象时出错：class SphereServlet
根本原因
com.sun.enterprise.container.common.spi.util.InjectionException：尝试注入远程ejb-ref名称的异常= SphereServlet / sphere，远程3.x接口= packt.SphereBean，ejb-link = null，lookup =，mappedName =，jndi-name = packt.SphereBean，refType = Session SphereServlet：SerialContext中'java：comp / env / SphereServlet / sphere'的查找失败[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.naming}
根本原因
javax.naming.NamingException：SerialContext中'java：comp / env / SphereServlet / sphere'的查找失败[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.naming} [根异常是javax.naming.NamingException：异常解析Ejb for'Remote ejb-ref name = SphereServlet / sphere，Remote 3.x interface = packt.SphereBean，ejb-link = null，lookup =，mappedName =，jndi-name = packt.SphereBean，refType = Session'。 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：SerialContext中的'packt.SphereBean＃packt.SphereBean'的查找失败[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.naming} [根异常是javax.naming.NameNotFoundException：未找到packt.SphereBean＃packt.SphereBean]]]
根本原因
javax.naming.NamingException：为远程ejb-ref名称= SphereServlet / sphere解析Ejb的异常，远程3.x接口= packt.SphereBean，ejb-link = null，lookup =，mappedName =，jndi-name = packt.SphereBean ，refType = Session'。 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：SerialContext中的'packt.SphereBean＃packt.SphereBean'的查找失败[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.naming} [根异常是javax.naming.NameNotFoundException：packt.SphereBean＃packt.SphereBean未找到]]
根本原因
javax.naming.NamingException：在SerialContext中'packt.SphereBean＃packt.SphereBean'的查找失败[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.naming} [根异常是javax.naming.NameNotFoundException：packt.SphereBean＃未找到packt.SphereBean]
根本原因
javax.naming.NameNotFoundException：未找到packt.SphereBean＃packt.SphereBean
note注意GlassFish Server Open Source Edition 4.1日志中提供了异常的完整堆栈跟踪及其根本原因。 GlassFish Server开源版4.1
说明书的第4.9.8节指出：
以下是暴露无界面视图的会话bean的要求：
bean类必须指定它通过它的bean类定义或部署描述符公开一个无接口视图。 以下规则适用：
如果bean没有公开任何其他客户端视图（本地，远程，无界面，2.x远程主页，2.x本地主页，Web服务）及其实现子句为空，则该bean定义一个无界面视图。
如果该bean公开至少一个其他客户端视图，那么该bean将通过Bean类或部署描述符中的LocalBean注释来指定它公开无接口视图。
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);
}
}
应该为你做诡计。
但是，如果您想实际使用本地/远程接口，那么这是注入时应使用的类型：
@WebServlet(urlPatterns = {"/SphereServlet"})
public class SphereServlet extends HttpServlet {
@EJB
SphereBeanRemote sphere;
...
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