log4j:ERROR A "org.apache.log4j.DailyRollingFileAppender" object is not assignable to a "org.apache.log4j.Appender" variable.

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多個classloader載入log4j時需要設定當前Thread的classloader為你自己的classloader

 

Thread.currentThread().setContextClassLoader(classLoader); //for log4j

 

摘自：org.apache.log4j.helpers.Loader

  /**   * If running under JDK 1.2 load the specified class using the   *  <code>Thread</code> <code>contextClassLoader</code> if that   *  fails try Class.forname. Under JDK 1.1 only Class.forName is   *  used.   *   */  static public Class loadClass (String clazz) throws ClassNotFoundException {    // Just call Class.forName(clazz) if we are running under JDK 1.1    // or if we are instructed to ignore the TCL.    if(java1 || ignoreTCL) {      return Class.forName(clazz);    } else {      try {    return getTCL().loadClass(clazz);      } catch(Throwable e) {    // we reached here because tcl was null or because of a    // security exception, or because clazz could not be loaded...    // In any case we now try one more time    return Class.forName(clazz);      }    }

 

log4j:ERROR A "org.apache.log4j.DailyRollingFileAppender" object is not assignable to a "org.apache.log4j.Appender" variable.log4j:ERROR The class "org.apache.log4j.Appender" was loaded bylog4j:ERROR [[email protected]40] whereas object of typelog4j:ERROR "org.apache.log4j.DailyRollingFileAppender" was loaded by [[email protected]].log4j:ERROR Could not instantiate appender named "main".log4j:ERROR A "org.apache.log4j.ConsoleAppender" object is not assignable to a "org.apache.log4j.Appender" variable.log4j:ERROR The class "org.apache.log4j.Appender" was loaded bylog4j:ERROR [[email protected]40] whereas object of typelog4j:ERROR "org.apache.log4j.ConsoleAppender" was loaded by [[email protected]].log4j:ERROR Could not instantiate appender named "console".log4j:WARN No appenders could be found for logger (com.generallycloud.baseio.component.ssl.SSLUtil).log4j:WARN Please initialize the log4j system properly.

原文：http://www.cnblogs.com/gifisan/p/6879465.html  

 

log4j:ERROR A "org.apache.log4j.DailyRollingFileAppender" object is not assignable to a "org.apache.log4j.Appender" variable.