Java – jsf2: injecting service objects into service beans from spring?

2020-04-05 • Java

I have tested this and tried to inject the service object into @ managedbean, but it failed NullPointerException because userservice is null

I am currently using Tomcat 7 and JSF 2. Here are some of my POMs xml

<properties>
    <java-version>1.6</java-version>
    <org.springframework-version>3.0.3.RELEASE</org.springframework-version>
    <org.hibernate-version>3.6.0.Final</org.hibernate-version>
    ....
</properties>

This is exception tracking:

javax.faces.el.EvaluationException: java.lang.NullPointerException
    at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:102)
    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:775)
    at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1267)
    at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:82)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
    at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:312)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:306)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:240)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:161)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:108)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:558)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:379)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:243)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:259)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:281)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
    at java.lang.Thread.run(Thread.java:636)
Caused by: java.lang.NullPointerException
    at org.albertkam.ui.LoginBean.login(LoginBean.java:38)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:616)
    at org.apache.el.parser.AstValue.invoke(AstValue.java:262)
    at org.apache.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:278)
    at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:98)
    at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:88)
    ... 23 more

This is my managedbean:

@ManagedBean
@RequestScoped
public class LoginBean {
    private MstUser entityMstUser;

    @Autowired
    private UserService userService;

    @postconstruct
    private void init() {
        this.entityMstUser = new MstUser();
    }

This is my service bean

@Service
public class UserService {

    @Autowired
    private UserDAO userDao;

    public void login(MstUser entityMstUser) {

This is my ApplicationContext xml ..

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:jee="http://www.springframework.org/schema/jee" xmlns:lang="http://www.springframework.org/schema/lang"
    xmlns:tx="http://www.springframework.org/schema/tx" xmlns:util="http://www.springframework.org/schema/util"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
        http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.0.xsd
        http://www.springframework.org/schema/lang http://www.springframework.org/schema/lang/spring-lang-3.0.xsd
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
        http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.0.xsd
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd"
    default-autowire="byName">

    <context:component-scan base-package="org.albertkam" />
    <context:annotation-config />
    <tx:annotation-driven />

</beans>

And my web xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

    <display-name>albert simpleWebapp</display-name>

    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>
            /WEB-INF/applicationContext.xml
            /WEB-INF/datasourceContext.xml
        </param-value>
    </context-param>

    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

    <servlet>
        <servlet-name>facesServlet</servlet-name>
        <servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>facesServlet</servlet-name>
        <url-pattern>/faces/*</url-pattern>
    </servlet-mapping>
    <welcome-file-list>
        <welcome-file>faces/index.xhtml</welcome-file>
    </welcome-file-list>
    <context-param>
        <param-name>javax.faces.PROJECT_STAGE</param-name>
        <param-value>Development</param-value>
    </context-param>

</web-app>

And my faces config XML, although it really doesn't matter here

<?xml version="1.0" encoding="UTF-8"?>

<faces-config
    xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-facesconfig_2_0.xsd"
    version="2.0">

    <application>
        <locale-config>
            <default-locale>in</default-locale>
            <supported-locale>en</supported-locale>
        </locale-config>
      <resource-bundle>
         <base-name>org.albertkam.common.messages</base-name>
         <var>msgs</var>
      </resource-bundle>
      <resource-bundle>
         <base-name>org.albertkam.common.errors</base-name>
         <var>errs</var>
      </resource-bundle>

      <!-- <message-bundle>id.co.sofcograha.override_messages</message-bundle>  -->
    </application>

    <factory>
        <exception-handler-factory>org.albertkam.common.BusinessExceptionHandlerFactory</exception-handler-factory>
    </factory>
</faces-config>

I wonder if it is possible to inject a spring managed bean into @ managedbean?

Please share your experience

thank you!

***********Some new experimental results are added****************

<listener>
    <listener-class>org.springframework.web.context.request.RequestContextListener</listener-class>
</listener>
<listener>
    <listener-class>org.jboss.weld.environment.servlet.Listener</listener-class>
</listener>Hello,

I have tested this because userservice is null

I am currently using Tomcat 7 to inject a spring managed bean into @ managedbean?

Please share your experience

thank you!

***********Some new experimental results are added****************

Just now I tried to replace @ managedbean and @ inject with @ named instead of @ Autowired. Although I haven't really understood the reason, it really works

So this is the modified managed bean:

@Named("userBean")
@RequestScoped
public class LoginBean {
    private MstUser entityMstUser;

    @Inject
    private UserService userService;

    @postconstruct
    private void init() {
        this.entityMstUser = new MstUser();
    }

This works, and the service object is injected, although userservice is managed by spring? How is that possible?

These are some extra things I added on the road

I'm on the web XML

<listener>
    <listener-class>org.springframework.web.context.request.RequestContextListener</listener-class>
</listener>
<listener>
    <listener-class>org.jboss.weld.environment.servlet.Listener</listener-class>
</listener>

I also added an empty WEB-INF / beans xml

And this is in faces config Org. XML springframework. web. jsf. el. SpringBeanFacesELResolver

I'm a little worried about using @ named because I have a bad experience using it and viewscoped I feel safer when I let @ managedbean inject service objects through the spring framework

I want to know what you usually do to connect managedbean and your business service object Using CDI, pure spring, or a combination of them?

Solution

faces-config. Missing variable parser in XML

<application>  
  <variable-resolver>  
    org.springframework.web.jsf.DelegatingVariableResolver 
  </variable-resolver>  
 </application>

On the web The requestcontextlistener listener listener is missing from the XML

<listener> 
  <listener-class>
    org.springframework.web.context.request.RequestContextListener
  </listener-class>  
</listener>

The content of this article comes from the network collection of netizens. It is used as a learning reference. The copyright belongs to the original author.

THE END

Java

二维码

Detailed introduction to LinearLayout of Android layout control

< <上一篇

Simple implementation of Android recyclerview loading different layouts

下一篇>>

搜索内容

Java – jsf2: injecting service objects into service beans from spring?

Solution

热门文章