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爪哇代码

 public static synchronized void init(String log4jXMLPath) //throws ServletException
   {
      try
      {
         if (!initialized) // set the global RepositorySelector
         {
            defaultRepository = LogManager.getLoggerRepository();
            RepositorySelector theSelector = new AppRepositorySelector();
            **LogManager.setRepositorySelector(theSelector, guard);**
            initialized = true;
         }
         Hierarchy hierarchy = new Hierarchy(new RootLogger(Level.DEBUG));
         //loadLog4JConfig(servletContext, hierarchy);
         loadLog4JConfig(hierarchy, log4jXMLPath);
         ClassLoader loader = Thread.currentThread().getContextClassLoader();
         repositories.put(loader, hierarchy);
      }
      catch (Exception e)
      {

         e.printStackTrace();
      }
   }

LogManager.setRepositorySelector(theSelector, guard); java代码中的这一行抛出错误

堆栈跟踪

18:17:11,189 ERROR [stderr] (MSC service thread 1-2) java.lang.IllegalArgumentException: Attempted to reset the LoggerFactory without possessing the guard.
18:17:11,190 ERROR [stderr] (MSC service thread 1-2)   at org.apache.log4j.LogManager.setRepositorySelector(LogManager.java:164)
18:17:11,191 ERROR [stderr] (MSC service thread 1-2)   at com.mportal.logger.api.AppRepositorySelector.init(AppRepositorySelector.java:73)
18:17:11,192 ERROR [stderr] (MSC service thread 1-2)   at com.mportal.logger.api.MPLoggerImpl.loadLogInstance(MPLoggerImpl.java:64)
18:17:11,192 ERROR [stderr] (MSC service thread 1-2)   at com.mportal.logger.api.MPLoggerImpl.<init>(MPLoggerImpl.java:38)
18:17:11,192 ERROR [stderr] (MSC service thread 1-2)   at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
18:17:11,193 ERROR [stderr] (MSC service thread 1-2)   at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
18:17:11,194 ERROR [stderr] (MSC service thread 1-2)   at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
18:17:11,194 ERROR [stderr] (MSC service thread 1-2)   at java.lang.reflect.Constructor.newInstance(Constructor.java:513)

这个怎么解决？请给出解决方案。

4

1 回答 1

1 
LogManager.setRepositorySelector(theSelector, guard);

您只能使用一个守卫，使用不同的守卫对象会导致观察者错误：

java.lang.IllegalArgumentException: Attempted to reset the LoggerFactory without possessing the guard.

应该可以null作为参数传递给函数。或者简单地持有对初始设置守卫的引用。

该文档指出：

最初守卫是空的。如果守卫为空，则调用此方法会设置记录器工厂和守卫。以下调用将抛出 IllegalArgumentException，除非先前设置的保护作为第二个参数传递。

于 2012-12-14T13:47:08.800 回答