将bean自动连接到JSF Managed bean时的空指针 [英] Null pointer when autowiring the bean into JSF Managed bean

问题描述

我已经开发了一个使用Spring Java邮件和速度模板的电子邮件服务，如下所示。

I have developed a Email service using Spring Java mail and Velocity Template like below.

Email.java

Email.java

@Component
public class Email {    

        private JavaMailSender mailSender;      
        private VelocityEngine velocityEngine;  


         @Autowired
        private ApplReviewService applReviewService;

       @Autowired
        private UserService userService;


        public void setUserService(UserService userService ) {
            this.userService=userService;
        }


        public UserService getuserService() {
            return userService;
        }

        @Autowired
        @Required
        public void setMailSender(JavaMailSender mailSender) {
            this.mailSender = mailSender;
        }

        public VelocityEngine getVelocityEngine() {
            return velocityEngine;
        }

        @Autowired
        @Required
        public void setVelocityEngine(VelocityEngine velocityEngine) {
            this.velocityEngine = velocityEngine;
        }

//发送电子邮件的方法。
}

// Method to send Email. }

我的Spring.xml

My Spring.xml

<context:component-scan base-package="com.test.common"/>

    <bean id="mailSender" class="org.springframework.mail.javamail.JavaMailSenderImpl">
           </bean>

   <bean id="velocityEngine" class="org.springframework.ui.velocity.VelocityEngineFactoryBean">
      <property name="velocityProperties">
         <value>
            resource.loader=class
            class.resource.loader.class=org.apache.velocity.runtime.resource.loader.ClasspathResourceLoader
         </value>
      </property>
   </bean>


@ManagedBean(name="person")
@SessionScoped
Public class Person{

@Autowired
private Email email ; // getter and setter for this.

}

我正在尝试将我的电子邮件类自动连接到Jsf managedBean，但我我得到空指针异常。

I am trying autowire my Email class into Jsf managedBean but I am getting null pointer exception. Where I am going wrong.

推荐答案

您不能在JSF托管的bean中注入这样的Spring bean。将其更改为

You cannot inject a Spring bean like that in a JSF managed bean. Change it to

@ManagedBean(name="person")
@SessionScoped
Public class Person{

@ManagedProperty(value="#{email}")
private Email email ; // getter and setter for this.

}

另请参见：

• @Scope（请求）不工作

• @Scope("request") not working

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