Java SystemEventListener+@WebSphere8.5上的值为null

Java SystemEventListener+@WebSphere8.5上的值为null,java,spring,jakarta-ee,websphere,websphere-8,Java,Spring,Jakarta Ee,Websphere,Websphere 8,我在一个我实现的SystemEventListener中遇到了一个问题。我正在使用注释@Value从属性文件中注入一个值。问题是注释@Value在应用程序的其他部分(如@Controller)工作正常,但在这个SystemEventListener中工作不正常。它还在tomcat上工作,但在WebSphere8.5上没有 你知道会是什么吗 实施 public class PreRenderViewListener implements SystemEventListener { @Va

我在一个我实现的SystemEventListener中遇到了一个问题。我正在使用注释@Value从属性文件中注入一个值。问题是注释@Value在应用程序的其他部分(如@Controller)工作正常,但在这个SystemEventListener中工作不正常。它还在tomcat上工作,但在WebSphere8.5上没有

你知道会是什么吗

实施

public class PreRenderViewListener implements SystemEventListener {

    @Value("${path}/fileName.properties")
    private String filePath;
faces config.xml

<system-event-listener>
            <system-event-listener-class>com.package.PreRenderViewListener</system-event-listener-class>
            <system-event-class>javax.faces.event.PreRenderViewEvent</system-event-class>
</system-event-listener>
这个配置在Tomcat中运行良好,所以我认为代码中没有问题,可能是与WebSphere8.5相关的问题。我一直在互联网上寻找这个问题,但我没有找到任何像这样的

谢谢你的帮助

正如戴纳姆先生所说

PreRenderViewListener是一个JSF(faces)管理的bean,而不是 spring管理bean,所以@Value不应该工作

因此,为了让它工作,您必须使您的
PreRenderViewListener
被Spring“识别”,这意味着它必须是Spring组件。
我现在正在使用的一个解决方案(我希望得到评论)是使用
multicaster
,比如
org.springframework.web.jsf.DelegatingPhaseListenerMulticaster
,它将在faces配置中注册,并将所有工作委托给实现
SystemEventListener
的其他Springbean 下面是Multicast的代码(它的灵感来自于前面提到的Spring Multicast)

最后,创建
SystemEventListener
bean,例如:

@Component
public class FooComponentListener  implements SystemEventListener{

@Autowired
private FooService fooService;

@Override
public void processEvent(SystemEvent event) throws AbortProcessingException {
    //Do your business
}

@Override
public boolean isListenerForSource(Object source) {
//Or any other condition
    return (source instanceof HtmlInputText || source instanceof HtmlOutputText || source instanceof HtmlOutputLabel);
}


}

我希望这会有所帮助,即使有点晚。

我会很惊讶它会起作用,基本上WebSphere中的行为就是我所期望的。
PreRenderViewListener
是一个JSF(faces)管理的bean,而不是spring管理的bean,因此
@Value
不应该工作。
package org.example.listeners;
import java.util.Collection;

import javax.faces.context.FacesContext;
import javax.faces.event.AbortProcessingException;
import javax.faces.event.SystemEvent;
import javax.faces.event.SystemEventListener;

import org.springframework.beans.factory.BeanFactoryUtils;
import org.springframework.beans.factory.ListableBeanFactory;
import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.jsf.FacesContextUtils;


public class DelegatingSystemEventListenerMulticaster implements SystemEventListener{

@Override
public void processEvent(SystemEvent event) throws AbortProcessingException {
    for (SystemEventListener listener : getDelegates(FacesContext.getCurrentInstance())) {
        if(listener.isListenerForSource(event.getSource())){
            listener.processEvent(event);
        }
    }

}

@Override
public boolean isListenerForSource(Object source) {
    for (SystemEventListener listener : getDelegates(FacesContext.getCurrentInstance())) {
        if(listener.isListenerForSource(source)){
          return true;
        }
    }
    return false;
}


/**
 * Obtain the delegate PhaseListener beans from the Spring root WebApplicationContext.
 * @param facesContext the current JSF context
 * @return a Collection of PhaseListener objects
 * @see #getBeanFactory
 * @see org.springframework.beans.factory.ListableBeanFactory#getBeansOfType(Class)
 */
protected Collection<SystemEventListener> getDelegates(FacesContext facesContext) {
    ListableBeanFactory bf = getBeanFactory(facesContext);
    return BeanFactoryUtils.beansOfTypeIncludingAncestors(bf, SystemEventListener.class, true, false).values();
}

/**
 * Retrieve the Spring BeanFactory to delegate bean name resolution to.
 * <p>The default implementation delegates to {@code getWebApplicationContext}.
 * Can be overridden to provide an arbitrary ListableBeanFactory reference to
 * resolve against; usually, this will be a full Spring ApplicationContext.
 * @param facesContext the current JSF context
 * @return the Spring ListableBeanFactory (never {@code null})
 * @see #getWebApplicationContext
 */
protected ListableBeanFactory getBeanFactory(FacesContext facesContext) {
    return getWebApplicationContext(facesContext);
}

/**
 * Retrieve the web application context to delegate bean name resolution to.
 * <p>The default implementation delegates to FacesContextUtils.
 * @param facesContext the current JSF context
 * @return the Spring web application context (never {@code null})
 * @see FacesContextUtils#getRequiredWebApplicationContext
 */
protected WebApplicationContext getWebApplicationContext(FacesContext facesContext) {
    return FacesContextUtils.getRequiredWebApplicationContext(facesContext);
}

}
<system-event-listener>
        <system-event-listener-class>org.example.listeners.DelegatingSystemEventListenerMulticaster</system-event-listener-class>
<!--Use any event you want here -->
        <system-event-class>javax.faces.event.PostAddToViewEvent</system-event-class>
    </system-event-listener> 
@Component
public class FooComponentListener  implements SystemEventListener{

@Autowired
private FooService fooService;

@Override
public void processEvent(SystemEvent event) throws AbortProcessingException {
    //Do your business
}

@Override
public boolean isListenerForSource(Object source) {
//Or any other condition
    return (source instanceof HtmlInputText || source instanceof HtmlOutputText || source instanceof HtmlOutputLabel);
}


}