小贝子编程

从另一个 CDI Bean 访问 CDI Bean



我必须从另一个请求范围的 CDI bean 访问会话范围的 CDI bean。我得到了：

  • 会话范围的 CDI Bean，用于保持登录用户，
  • 请求范围的 CDI Bean，它处理当前登录用户实例的某些数据和需求（为此目的）。

当我尝试从请求作用域 bean（通过 @Inject 注释）访问会话作用域 bean 时，如下所示 - 我在此行中得到NullPointerException异常（位于addData方法中）：

String surname=loginController.getCurrentUser().getSurname();

你能告诉我如何解决这个问题吗？

当然，如果我打印例如：#{loginController.currentUser.surname}从任何 xhtml 页面，一切正常，但我需要从 bean 访问，而不是从 xhtml 页面访问。

这是登录页面的一部分：

<h:form class="form">               
    <p:growl id="growl" showDetail="false" />
    <h:inputText id="username" value="#{userLogin.username}" label="Username" required="true" requiredMessage="Username: This field is required." title="Enter your username." pt:placeholder="Username" />                     
    <h:inputSecret  id="password" value="#{userLogin.password}" label="Password" required="true" requiredMessage="Password: This field is required." title="Enter your password." pt:placeholder="Password" />                  
    <p:commandButton value="Login" action="#{loginController.login}" update="growl" styleClass="buttonStyle"/>                  
</h:form>

这是一个会话范围的 CDI Bean：

@Named
@SessionScoped
public class LoginController implements Serializable {
    private static final long serialVersionUID = -6322113716363932422L;
    public String login(){      
        if(userService.login(userLogin)){
            currentUser=userService.getCurrnetUser(userLogin.getUsername());
            return "home?faces-redirect=true";          
        }
        else{
            facesContext.addMessage(null, new FacesMessage("Data entered are incorrect"));
            return null;
        }
    }
    public String logout(){
        currentUser=null;
        return "login?faces-redirect=true";
    }
    public boolean isLoggedIn() {
          return currentUser!=null;
    }
    @Produces
    @LoggedIn
    public UserAccount getCurrentUser(){
        return currentUser; 
    }   
    @Inject
    private FacesContext facesContext;
    @Inject
    private UserServiceImpl userService;
    @Named
    @Produces
    @RequestScoped
    private UserAccount userLogin=new UserAccount();
    private UserAccount currentUser;
}

这是一个请求范围的 CDI Bean：

@Named
@RequestScoped
public class DataServiceImpl implements DataService {
    @Override
    public void addData(String[] data) {
        //Proccess some data
        String surname=loginController.getCurrentUser().getSurname();
        //Proccess some data
    }
    @Inject
    private LoginController loginController;
}

这是一个堆栈跟踪：

18:45:08,968 WARNING [javax.enterprise.resource.webcontainer.jsf.lifecycle] (default task-15) #{dataController.send()}: java.lang.NullPointerException: javax.faces.FacesException: #{dataController.send()}: java.lang.NullPointerException
    at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:118)
    at javax.faces.component.UICommand.broadcast(UICommand.java:315)
    at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:790)
    at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1282)
    at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
    at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:198)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:658)
    at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:85)
    at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:62)
    at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36)
    at org.wildfly.extension.undertow.security.SecurityContextAssociationHandler.handleRequest(SecurityContextAssociationHandler.java:78)
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
    at io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:131)
    at io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:57)
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
    at io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:46)
    at io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:64)
    at io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:60)
    at io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:77)
    at io.undertow.security.handlers.NotificationReceiverHandler.handleRequest(NotificationReceiverHandler.java:50)
    at io.undertow.security.handlers.AbstractSecurityContextAssociationHandler.handleRequest(AbstractSecurityContextAssociationHandler.java:43)
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
    at org.wildfly.extension.undertow.security.jacc.JACCContextIdHandler.handleRequest(JACCContextIdHandler.java:61)
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
    at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:284)
    at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:263)
    at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:81)
    at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:174)
    at io.undertow.server.Connectors.executeRootHandler(Connectors.java:202)
    at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:793)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)
Caused by: javax.faces.el.EvaluationException: java.lang.NullPointerException
    at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:101)
    at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102)
    ... 34 more
Caused by: java.lang.NullPointerException
    at com.system.service.DataServiceImpl.addData(DataServiceImpl.java:24)
    at com.system.controller.DataController.send(DataController.java:97)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at javax.el.ELUtil.invokeMethod(ELUtil.java:308)
    at javax.el.BeanELResolver.invoke(BeanELResolver.java:415)
    at javax.el.CompositeELResolver.invoke(CompositeELResolver.java:256)
    at com.sun.el.parser.AstValue.invoke(AstValue.java:285)
    at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:304)
    at org.jboss.weld.util.el.ForwardingMethodExpression.invoke(ForwardingMethodExpression.java:40)
    at org.jboss.weld.el.WeldMethodExpression.invoke(WeldMethodExpression.java:50)
    at org.jboss.weld.util.el.ForwardingMethodExpression.invoke(ForwardingMethodExpression.java:40)
    at org.jboss.weld.el.WeldMethodExpression.invoke(WeldMethodExpression.java:50)
    at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:105)
    at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:87)
    ... 35 more
18:45:08,971 SEVERE [javax.enterprise.resource.webcontainer.jsf.context] (default task-15) javax.faces.el.EvaluationException: java.lang.NullPointerException
    at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:101)
    at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102)
    at javax.faces.component.UICommand.broadcast(UICommand.java:315)
    at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:790)
    at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1282)
    at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
    at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:198)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:658)
    at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:85)
    at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:62)
    at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36)
    at org.wildfly.extension.undertow.security.SecurityContextAssociationHandler.handleRequest(SecurityContextAssociationHandler.java:78)
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
    at io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:131)
    at io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:57)
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
    at io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:46)
    at io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:64)
    at io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:60)
    at io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:77)
    at io.undertow.security.handlers.NotificationReceiverHandler.handleRequest(NotificationReceiverHandler.java:50)
    at io.undertow.security.handlers.AbstractSecurityContextAssociationHandler.handleRequest(AbstractSecurityContextAssociationHandler.java:43)
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
    at org.wildfly.extension.undertow.security.jacc.JACCContextIdHandler.handleRequest(JACCContextIdHandler.java:61)
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
    at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:284)
    at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:263)
    at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:81)
    at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:174)
    at io.undertow.server.Connectors.executeRootHandler(Connectors.java:202)
    at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:793)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NullPointerException
    at com.system.service.DataServiceImpl.addData(DataServiceImpl.java:24)
    at com.system.controller.DataController.send(DataController.java:97)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at javax.el.ELUtil.invokeMethod(ELUtil.java:308)
    at javax.el.BeanELResolver.invoke(BeanELResolver.java:415)
    at javax.el.CompositeELResolver.invoke(CompositeELResolver.java:256)
    at com.sun.el.parser.AstValue.invoke(AstValue.java:285)
    at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:304)
    at org.jboss.weld.util.el.ForwardingMethodExpression.invoke(ForwardingMethodExpression.java:40)
    at org.jboss.weld.el.WeldMethodExpression.invoke(WeldMethodExpression.java:50)
    at org.jboss.weld.util.el.ForwardingMethodExpression.invoke(ForwardingMethodExpression.java:40)
    at org.jboss.weld.el.WeldMethodExpression.invoke(WeldMethodExpression.java:50)
    at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:105)
    at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:87)
    ... 35 more

这是另一个 CDI bean，其中有一个 send 方法（我从中调用 addData 方法），我们可以在堆栈跟踪中看到：

@Named
@ViewScoped
public class DataController implements Serializable {
    private static final long serialVersionUID = 1383572529241805730L;
    //some methods
    public void send(){
        if(uploadFile==null){
            FacesContext.getCurrentInstance().addMessage(null, new FacesMessage(FacesMessage.SEVERITY_ERROR, "The file isn't uploaded", "You should upload a file"));
        }
        else{
            //Sending the data to the database...
            list=new ArrayList<String>();
            //It should be a upload file but for now I add it manually.
            try(Stream<String> stream=Files.lines(Paths.get("F:/VirtualBox/Share/capture20110815.binetflow"))) {            
                list=stream.collect(Collectors.toList());
                int start=0;                
                Pattern pattern=Pattern.compile(",");
                dataService=new DataServiceImpl();
                for (String s : list) {
                    if(start!=0){
                        String[] data=pattern.split(s);
                        dataService.addData(data);
                    }
                    else start++;
                }                           
            } catch (IOException e) {
                e.printStackTrace();
            }       
            FacesContext.getCurrentInstance().addMessage(null, new FacesMessage(FacesMessage.SEVERITY_INFO, "The data has been added.", ""));           
        }
    }
    @Named
    @Produces
    @RequestScoped
    private UserTable userTable=new UserTable();  
    @Inject
    private DataService dataService;
    @Inject
    private FacesContext facesContext;
    @Inject
    private Logger log;
    private UploadedFile uploadFile;
    private List<String> list;
}

我找到了解决方案。一步一步地我做了什么：

  1. 我从DataServiceImpl豆中删除了LoginController，并将带有@LoggedIn注释的UserAccount注入了DataController豆：

    @Named
@ViewScoped
public class DataController implements Serializable {
    //other fields and methods
    @Inject
    @LoggedIn
    private UserAccount currentUser;
}

    您也可以将LoginController注入DataController Bean 而不是UserAccount，但不建议这样做。如果你注射UserAccount会更好.

  2. 我在 DataServiceImpl 类中创建了 addCurrnetUser() 方法。该方法的参数是UserAccount对象：

    @Named
@RequestScoped
public class DataServiceImpl implements DataService {
    @Override
    public void addCurrentUser(UserAccount currentUser){
        this.currentUser=currentUser;
    }
    @Override
    public void addData(String[] data) {
        //Proccess some data
        String surname=loginController.getCurrentUser().getSurname();
        //Proccess some data
    }
    private UserAccount currentUser;
}

  3. 在调用dataService.addData()之前，我在send()方法（位于DataController bean中）中调用了dataService.addCurrentUser(currentUser)。

你也可以有一个问题：为什么注入的LoginController在DataServiceImpl豆中返回null，而在DataController豆中返回不？看看这个讨论。你可以在那里找到一些原因。

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