求帮助 Spring 实现BeanPostProcessor 之后 启动报 NullPointerException

Question

具体代码：
实现的 java 
public class InitGlobalConstants implements BeanPostProcessor {    @Override
    public Object postProcessAfterInitialization(Object obj, String beanName) throws BeansException {
        
        System.out.println("系统正在准备对" + beanName + "进行初始化...");
        return null;
    }    @Override
    public Object postProcessBeforeInitialization(Object arg0, String arg1) throws BeansException {
        // TODO Auto-generated method stub
        return null;
    }
}applicationContext.xml 
里边也加了
<bean class="com.ryxt.basic.init.InitGlobalConstants" />报错信息：
2013-7-9 18:12:49 org.apache.catalina.core.ApplicationContext log
信息: Initializing Spring root WebApplicationContext
系统正在准备对dataSource进行初始化...
系统正在准备对sessionFactory进行初始化...
2013-7-9 18:12:52 org.apache.catalina.core.StandardContext listenerStart
严重: Exception sending context initialized event to listener instance of class org.springframework.web.context.ContextLoaderListener
java.lang.NullPointerException
at org.springframework.beans.factory.support.AbstractBeanFactory.getObjectForBeanInstance(AbstractBeanFactory.java:1266)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:275)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:185)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:164)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:423)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:728)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:380)
at org.springframework.web.context.ContextLoader.createWebApplicationContext(ContextLoader.java:255)
at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:199)
at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:45)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3934)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4429)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:791)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:771)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:526)
at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:987)
at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:909)
at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:495)
at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1206)
at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:314)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:722)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)
at org.apache.catalina.core.StandardService.start(StandardService.java:516)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)
at org.apache.catalina.startup.Catalina.start(Catalina.java:583)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:288)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413)
2013-7-9 18:12:52 org.apache.catalina.core.StandardContext start
严重: Error listenerStart
2013-7-9 18:12:52 org.apache.catalina.core.StandardContext start
求大家帮忙啊。。

Answer 1

public class InitGlobalConstants implements BeanPostProcessor {
 
    @Override
    public Object postProcessAfterInitialization(Object obj, String beanName) throws BeansException {
         
        System.out.println("系统正在准备对" + beanName + "进行初始化...");
        return obj;
    }
 
    @Override
    public Object postProcessBeforeInitialization(Object arg0, String arg1) throws BeansException {
        // TODO Auto-generated method stub
        return arg0;
    }
}