Java 扩展@Named@SessionScoped bean
我有父类名为Java 扩展@Named@SessionScoped bean,java,jakarta-ee,ejb,cdi,named,Java,Jakarta Ee,Ejb,Cdi,Named,我有父类名为Navigation,子类名为ExtendingNavigation导航被注释为@Named(“导航”)和@SessionScoped(javax.enterprise.context.SessionScoped;)。我在其中注入UserBean,并在login()方法中初始化它。假设我想在其他类中使用userBean。我怎么做?为什么我不能从导航扩展 以下是类(仅作为示例): 航行 @Named("navigation") @SessionScoped public class N
Navigation
,子类名为ExtendingNavigation
<代码>导航被注释为@Named(“导航”)
和@SessionScoped
(javax.enterprise.context.SessionScoped;)。我在其中注入UserBean
,并在login()
方法中初始化它。假设我想在其他类中使用userBean
。我怎么做?为什么我不能从导航扩展
以下是类(仅作为示例):
航行
@Named("navigation")
@SessionScoped
public class Navigation implements Serializable {
private static final long serialVersionUID = 1L;
@Inject
protected UserBean userBean;
public void logout() {
userBean = null;
}
public void login() {
EntityManager em = JPAUtil.getEntityManagerFactory().createEntityManager();
userBean = em.find(UserBean.class, userBean.getUsername());
}
}
public class ExtendingNavigation extends Navigation{
}
扩展导航
@Named("navigation")
@SessionScoped
public class Navigation implements Serializable {
private static final long serialVersionUID = 1L;
@Inject
protected UserBean userBean;
public void logout() {
userBean = null;
}
public void login() {
EntityManager em = JPAUtil.getEntityManagerFactory().createEntityManager();
userBean = em.find(UserBean.class, userBean.getUsername());
}
}
public class ExtendingNavigation extends Navigation{
}
如果我试图编译它,它会给我一个错误
17:01:29,956 ERROR [org.jboss.msc.service.fail] (MSC service thread 1-7) MSC00001: Failed to start service jboss.deployment.unit."timereport.war".WeldService: org.jboss.msc.service.StartException in service jboss.deployment.unit."timereport.war".WeldService: org.jboss.weld.exceptions.DeploymentException: WELD-001409 Ambiguous dependencies for type [NavigationBean] with qualifiers [@Default] at injection point [[field] @Inject timereport.ui.biz.faces.context.ValidateUserAuthenticationAction.navigation]. Possible dependencies [[Managed Bean [class timereport.navigation.NavigationBean] with qualifiers [@Any @Default @Named], Managed Bean [class timereport.navigation.ExtendingNavigation] with qualifiers [@Any @Default]]]
at org.jboss.as.weld.services.WeldService.start(WeldService.java:96)
at org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:1824) [jboss-msc-1.0.1.GA.jar:1.0.1.GA]
at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1759) [jboss-msc-1.0.1.GA.jar:1.0.1.GA]
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:885) [:1.6.0_07]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907) [:1.6.0_07]
at java.lang.Thread.run(Thread.java:619) [:1.6.0_07]
Caused by: org.jboss.weld.exceptions.DeploymentException: WELD-001409 Ambiguous dependencies for type [NavigationBean] with qualifiers [@Default] at injection point [[field] @Inject timereport.ui.biz.faces.context.ValidateUserAuthenticationAction.navigation]. Possible dependencies [[Managed Bean [class timereport.navigation.NavigationBean] with qualifiers [@Any @Default @Named], Managed Bean [class timereport.navigation.ExtendingNavigation] with qualifiers [@Any @Default]]]
at org.jboss.weld.bootstrap.Validator.validateInjectionPoint(Validator.java:274)
at org.jboss.weld.bootstrap.Validator.validateBean(Validator.java:106)
at org.jboss.weld.bootstrap.Validator.validateRIBean(Validator.java:129)
at org.jboss.weld.bootstrap.Validator.validateBeans(Validator.java:351)
at org.jboss.weld.bootstrap.Validator.validateDeployment(Validator.java:336)
at org.jboss.weld.bootstrap.WeldBootstrap.validateBeans(WeldBootstrap.java:404)
at org.jboss.as.weld.WeldContainer.start(WeldContainer.java:82)
at org.jboss.as.weld.services.WeldService.start(WeldService.java:89)
... 5 more
请帮忙 您的问题是,您正在类ValidateUserAuthenticationAction
中注入一个Navigation
的实例,但是,在注入点可以使用两个不同的类,就像主异常状态一样。解决此问题的最简单方法是向注入点(如果您选择)和两个导航
类之一添加限定符
限定符是这个问题的解决方案,也是它们在规范中的全部要点。限定符为注入点添加了额外的歧义消除,或者换句话说,它有助于专门化类和注入点。问题不是注入用户bean,您完全可以在其他地方使用它
问题是子类ExtendingNavigation
与Navigation
类(名称“Navigation”)具有相同的限定符。用@Named(“extendedNavigation”)
或类似的东西注释extendedingNavigation
,然后将@Named(“extendedNavigation”)
指定在您希望使用它的@Inject
旁边
这样想:你说的是“给我一个X类的实例”,Weld说的是“我不知道你想要哪个”,因为实际上有两个类是导航类
class ValidateUserAuthenticationAction {
@Inject
@Named("extendedNavigation")
private Navigation navigation;
}
另外,尝试使用接口!导航应该是一个界面。基本导航应该实现它,扩展导航也应该实现它。我遇到了非常类似的问题,我得到了一些脱机帮助。我的问题是,在我的服务所在的地方,它包括在已部署的ear中,也包括在我的web项目中。这是一个偶然的重复,退出一个,如果它是你的情况下也会工作
在下图中,我将esb_khr_web中的esb_khr移除。在eclipse中:转到属性和部署程序集
您遇到的错误是什么?堆栈跟踪?thanksI发布了stacktrace中出现错误的确切部分。假设上面示例中的导航bean在我的codeP.S中被称为NavigationBean。命名ExtendingNavigation或对SessionScoped没有帮助。这信息太少了吗?@Named
是一个限定符。只需给子类一个不同的@Named
Named是特殊的,但通常不会像其他限定符那样处理。看起来我错了,抱歉。