@EJB 注释使 servlet 崩溃

Question

我的 serlvet 中有这样的 @EJB 注释

import javax.ejb.EJB;
import stateless.Staff;
public class DisplayStaff extends HttpServlet 
{
    private static final long serialVersionUID = 1L;

        @EJB
        private StaffBean Staff_bean;
        ....
}

没有该注释及其声明，servlet 可以工作并被调用。使用注释我得到错误

root cause

com.sun.enterprise.container.common.spi.util.InjectionException: Error creating managed object for class: class controllers.DisplayStaff

root cause

com.sun.enterprise.container.common.spi.util.InjectionException: Exception attempting to inject Remote ejb-ref name=controllers.DisplayStaff/Stud_bean,Remote 3.x interface =stateless.StaffBean,ejb-link=null,lookup=,mappedName=,jndi-name=stateless.StaffBean,refType=Session into class controllers.DisplayStaff: Lookup failed for 'java:comp/env/controllers.DisplayStaff/Stud_bean' in SerialContext[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}

root cause

javax.naming.NamingException: Lookup failed for 'java:comp/env/controllers.DisplayStaff/Stud_bean' in SerialContext[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} [Root exception is javax.naming.NamingException: Exception resolving Ejb for 'Remote ejb-ref name=controllers.DisplayStaff/Stud_bean,Remote 3.x interface =stateless.StaffBean,ejb-link=null,lookup=,mappedName=,jndi-name=stateless.StaffBean,refType=Session' .  Actual (possibly internal) Remote JNDI name used for lookup is 'stateless.StaffBean#stateless.StaffBean' [Root exception is javax.naming.NamingException: Lookup failed for 'stateless.StaffBean#stateless.StaffBean' in SerialContext[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} [Root exception is javax.naming.NameNotFoundException: stateless.StaffBean#stateless.StaffBean not found]]]

root cause

javax.naming.NamingException: Exception resolving Ejb for 'Remote ejb-ref name=controllers.DisplayStaff/Stud_bean,Remote 3.x interface =stateless.StaffBean,ejb-link=null,lookup=,mappedName=,jndi-name=stateless.StaffBean,refType=Session' .  Actual (possibly internal) Remote JNDI name used for lookup is 'stateless.StaffBean#stateless.StaffBean' [Root exception is javax.naming.NamingException: Lookup failed for 'stateless.StaffBean#stateless.StaffBean' in SerialContext[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} [Root exception is javax.naming.NameNotFoundException: stateless.StaffBean#stateless.StaffBean not found]]

root cause

javax.naming.NamingException: Lookup failed for 'stateless.StaffBean#stateless.StaffBean' in SerialContext[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} [Root exception is javax.naming.NameNotFoundException: stateless.StaffBean#stateless.StaffBean not found]

root cause

javax.naming.NameNotFoundException: stateless.StaffBean#stateless.StaffBean not found

note The full stack traces of the exception and its root causes are available in the GlassFish Server Open Source Edition 3.1.2 logs.

Answer 1

容器在JNDI 中找不到你的bean。

您通常应该注入对 bean 的远程或本地接口的引用，而不是 bean 本身：

@EJB
private StaffBeanRemote Staff_bean;

但可以肯定的是，使用 JNDI 资源管理器（通常在应用程序服务器的管理控制台上）查看确切的 JNDI 名称。还要确保 bean 本身已部署并运行正常（也可以在管理控制台上检查）

Answer 2

将引用的 bean 声明为静态的。

@EJB
private static StaffBean Staff_bean;

希望这可行。 谢谢