讨论log4j记录日志失败的异常处理
本帖最后由 lg_asus 于 2012-12-08 14:18:52 编辑 http://stackoverflow.com/questions/13758735/how-can-i-get-notified-when-log4j-fails

下面是demo code:

package test;



import java.lang.Thread.UncaughtExceptionHandler;



import org.apache.log4j.Logger;



public class Test2

{



    public static void main(String...args){

       Thread.setDefaultUncaughtExceptionHandler(new UncaughtExceptionHandler(){

           @Override

           public void uncaughtException(Thread t, Throwable e)

           {

              System.out.println(t);

              e.printStackTrace();

           }

       });

       Logger logger = null;

       try{

           logger = Logger.getLogger(Test2.class);

       }catch(Exception e){

           e.printStackTrace();

//         switch to other appender

//         logger = Logger.getLogger("hell");

       }

       logger.info("Hello");

    }

}

my log4j.properties is:

log4j.rootLogger = error, DYNADS



log4j.logger.test= info, DYNADS



log4j.appender.DYNADS = org.apache.log4j.DailyRollingFileAppender   

log4j.appender.DYNADS.File = Z:/log/app-log.txt  

log4j.appender.DYNADS.Append = true  

log4j.appender.DYNADS.layout = org.apache.log4j.PatternLayout  

log4j.appender.DYNADS.layout.ConversionPattern = %d{HH:mm:ss,SSS} [%-5p] %m%n

the result of code is :

log4j:ERROR setFile(null,true) call failed.

java.io.FileNotFoundException: Z:\log\app-log.txt (系统找不到指定的路径。)

    at java.io.FileOutputStream.openAppend(Native Method)

    at java.io.FileOutputStream.<init>(FileOutputStream.java:177)

    at java.io.FileOutputStream.<init>(FileOutputStream.java:102)

    at org.apache.log4j.FileAppender.setFile(FileAppender.java:290)

    at org.apache.log4j.FileAppender.activateOptions(FileAppender.java:164)

    at org.apache.log4j.DailyRollingFileAppender.activateOptions(DailyRollingFileAppender.java:216)

    at org.apache.log4j.config.PropertySetter.activate(PropertySetter.java:257)

    at org.apache.log4j.config.PropertySetter.setProperties(PropertySetter.java:133)

    at org.apache.log4j.config.PropertySetter.setProperties(PropertySetter.java:97)

    at org.apache.log4j.PropertyConfigurator.parseAppender(PropertyConfigurator.java:689)

    at org.apache.log4j.PropertyConfigurator.parseCategory(PropertyConfigurator.java:647)