struts的错

Question

出现了严重: Exception starting filter struts-prepare
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

Answer 1

空值异常 fileManager类代码仔细查看

Answer 2

struts。xml <constant name="struts.devMode" value="false" />   

Answer 3

<filter>
<filter-name>encodingFilter</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
</filter> <filter-mapping>
<filter-name>encodingFilter</filter-name>
<url-pattern>*.action</url-pattern>
</filter-mapping> <filter-mapping>
<filter-name>encodingFilter</filter-name>
<url-pattern>*.jsp</url-pattern>
</filter-mapping> <filter>
<filter-name>struts-prepare</filter-name>
<filter-class>
org.apache.struts2.dispatcher.ng.filter.StrutsPrepareFilter</filter-class>
</filter> <filter-mapping>
<filter-name>struts-prepare</filter-name>
<url-pattern>*.action</url-pattern>
</filter-mapping> <filter>
<filter-name>struts-execute</filter-name>
<filter-class>
org.apache.struts2.dispatcher.ng.filter.StrutsExecuteFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>struts-execute</filter-name>
<url-pattern>*.action</url-pattern>
</filter-mapping>
我觉得估计是这里的问题！ 但我找不到啥子问题！