If FileAppender is not working, return to ConsoleAppender

Question

With log4j, I would like to return to ConsoleAppender if FileAppender has problems writing to the specified log file. This means that you will catch a FileNotFoundException or IOException and switch to ConsoleAppender.

This has been done before or I need to create a new appender - something like lines:

private WriterAppender appender;

public FileOrConsoleAppender(Layout layout, String filename, boolean append) {
    try {
        appender = new FileAppender(layout, filename, append, bufferedIO, bufferSize);
    }
    catch (IOException e) {
        appender = new ConsoleAppender(layout);
    }
}

UPDATE - HOW TO DO:

Thanks @jsight, pointing me to FallBackErrorHandler.

Here is my log4j xml configuration that returns to ConsoleAppender if FileAppender does not work:

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/" debug="true">

  <!-- A Console appender -->
  <appender name="console" class="org.apache.log4j.ConsoleAppender">
    <param name="Target" value="System.out"/>
    <layout class="org.apache.log4j.PatternLayout">
      <param name="ConversionPattern" value="%d %-5p %30.30c - %m%n"/>
    </layout>
  </appender>

  <!-- A File appender, with fallback to Console-->
  <appender name="file" class="org.apache.log4j.DailyRollingFileAppender">
  <errorHandler class="org.apache.log4j.varia.FallbackErrorHandler">
       <root-ref/>
       <appender-ref ref="console"/>
  </errorHandler>
    <param name="File" value="C:/temp/test.log"/>
    <layout class="org.apache.log4j.PatternLayout">
      <param name="ConversionPattern" value="%d %-5p %30.30c - %m%n"/>
    </layout>
  </appender>

<root>
       <level value="INFO" />
       <appender-ref ref="file" />
</root>

</log4j:configuration>

Answer 1

FallbackErrorHandler looks the way you need it. Here are a few newsletters on this topic:

• http://marc.info/?l=log4j-user&m=109637619726970&w=2
• http://marc.info/?l=log4j-user&m=104024052821602&w=2
• http://www.mail-archive.com/[e-mail]/msg07491.html
• http://www.mail-archive.com/[e-mail]/msg06774.html

Answer 2

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