J2EE Web應用程序中的Log4j路徑配置錯誤

Question

使用DOMConfigurator在Java EE Web應用程序中使用Log4j時遇到問題。 我的類路徑上有log4j.jar文件，而log4j.xml文件的路徑為/WEB-INF/config/log4j.xml 。

以下是例外：

  log4j:ERROR Could not parse file [/WEB-INF/config/log4j.xml].
  java.io.FileNotFoundException: D:\WEB-INF\config\log4j.xml (The system cannot find the      path specified)
at java.io.FileInputStream.open(Native Method)
at java.io.FileInputStream.<init>(Unknown Source)
at java.io.FileInputStream.<init>(Unknown Source)
at sun.net.www.protocol.file.FileURLConnection.connect(Unknown Source)
at sun.net.www.protocol.file.FileURLConnection.getInputStream(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.setupCurrentEntity(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLVersionDetector.determineDocVersion(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(Unknown Source)
at javax.xml.parsers.DocumentBuilder.parse(Unknown Source)
at org.apache.log4j.xml.DOMConfigurator$1.parse(DOMConfigurator.java:749)
at org.apache.log4j.xml.DOMConfigurator.doConfigure(DOMConfigurator.java:871)
at org.apache.log4j.xml.DOMConfigurator.doConfigure(DOMConfigurator.java:755)
at org.apache.log4j.xml.DOMConfigurator.configure(DOMConfigurator.java:896)
at org.tree.egc.Utils.RequestFilter.init(RequestFilter.java:64)
at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:295)
at org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:422)
at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:115)
at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4072)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4726)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1057)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:840)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1057)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:463)
at org.apache.catalina.core.StandardService.start(StandardService.java:525)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:754)
at org.apache.catalina.startup.Catalina.start(Catalina.java:595)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)

下面是在servlet中獲取log4j.xml文件的代碼：

   String log4jpath=Config.getInitParameter("log4j");       
   DOMConfigurator.configure(log4jpath);

web.xml中的條目

    <init-param>
<param-name>log4j</param-name>
<param-value>WEB-INF/config/log4j.xml</param-value>
</init-param>

Answer 1

將配置文件“ log4j.xml”移到類路徑（/WEB-INF/classes/log4j.xml）

如果您的log4j.xml位於類路徑中，則在啟動應用程序服務器時，應自動加載它。

如果您仍然遇到路徑問題。 嘗試這個

   ServletContext servletContext = request.getSession().getServletContext();
   String log4jpath=Config.getInitParameter("log4j");       
   String absoluteDiskPath = servletContext.getRealPath(log4jpath);

   DOMConfigurator.configure(absoluteDiskPath);

還要檢查此鏈接， 在Java EE應用程序中找不到Log4j.xml拋出文件