高分求助一问题

Question

当web.xml中写filter的时候，启动tomcat就会报Error filterStart错误，如果web.xml不写这些的话就不会报错，这是为什么啊 严重: Exception starting filter struts2
java.lang.NullPointerException
at com.opensymphony.xwork2.util.FileManager$FileRevision.needsReloading(FileManager.java:209)
at com.opensymphony.xwork2.util.FileManager.fileNeedsReloading(FileManager.java:60)
at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.needsReload(XmlConfigurationProvider.java:325)
at org.apache.struts2.config.StrutsXmlConfigurationProvider.needsReload(StrutsXmlConfigurationProvider.java:168)
at com.opensymphony.xwork2.config.ConfigurationManager.conditionalReload(ConfigurationManager.java:220)
at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:61)
at org.apache.struts2.dispatcher.Dispatcher.getContainer(Dispatcher.java:774)
at org.apache.struts2.dispatcher.ng.InitOperations.initStaticContentLoader(InitOperations.java:77)
at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.init(StrutsPrepareAndExecuteFilter.java:49)
at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:275)
at org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:397)
at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:108)
at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:3693)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4340)
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:525)
at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:920)
at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:883)
at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:492)
at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1138)
at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:311)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:719)
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:566)
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)
2011-6-12 9:42:40 org.apache.catalina.core.StandardContext start
严重: Error filterStart
2011-6-12 9:42:40 org.apache.catalina.core.StandardContext start
严重: Context [/Test] startup failed due to previous errorsweb.xml中一点问题都没有，可是就一直报这个错误，都弄了一天不行啊，哪位大侠能帮帮忙啊

Answer 1

那还需要什么信息啊？web.xml是我复制别人的，肯定没问题

Answer 2

楼主是不是在页面上用Struts2标签了，web.xml中fileter中路径是不是配置的"/*"。

Answer 3

java.lang.NullPointerException去找空指针的问题我觉得web.xml的filter配置应该没有问题，像我下面这样配置都能正常运行的
    <!-- 过滤器 -->
    <filter>
        <filter-name>filterDemo</filter-name>
        <filter-class>FilterDemo</filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>UTF-8</param-value>
        </init-param>
        <init-param>
            <param-name>forceEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>filterDemo</filter-name>
        <url-pattern>*.html</url-pattern>
    </filter-mapping>
    <filter-mapping>
        <filter-name>filterDemo</filter-name>
        <url-pattern>*.jsp</url-pattern>
    </filter-mapping>
    <filter-mapping>
        <filter-name>filterDemo</filter-name>
        <url-pattern>*</url-pattern>
    </filter-mapping>

Answer 4

java.lang.NullPointerException
    at com.opensymphony.xwork2.util.Fistuts2 配置出错了

Answer 5

struts.xml代码
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN"
    "http://struts.apache.org/dtds/struts-2.1.dtd"><struts>
 
 <constant name="struts.devMode" value="true" />
 <package name="default" namespace="/" extends="struts-default">
        
        <action name="hello">
            <result name="success">
                /Hello.jsp
            </result>
        </action>
    </package></struts>我用的是struts2-core-2.1.6.jar，不知道那里出问题了

Answer 6

NullPointerException空指针异常
FileManager 类的 209 行中有对象为空是Tomcat的安装路径包含空格的问题

Answer 7

web.xml
 配置这个的时候
<filter>
<filter-name>struts2</filter-name>
<filter-class>
org.apache.struts2.dispatcher.FilterDispatcher
</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
 
你把web.xml的配置贴出来看下

Answer 8

struts2 这行去掉
  <constant name="struts.devMode" value="true" />

Answer 9

谢谢各位了，问题已解决，确实是struts.xml中多了一句话：<constant name="struts.devMode" value="true" />
但我不明白，为什么多了这句就会爆filter的错误啊