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Asked: 2026-06-12T07:47:25+00:00

I have done some Googling around it but couldn’t find any relevant information. log4j

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I have done some Googling around it but couldn’t find any relevant information. log4j supports a bunch of log appenders, there’s documentation all over the net about ConsoleAppender and FileAppender, but there are very little or no information about appenders such as NullAppender, JDBCAppender etc. I am particularly interested about NullAppender. 

<appender name="???" class="org.apache.log4j.varia.NullAppender">
<appender name="???" class="org.apache.log4j.jdbc.JDBCAppender">

Does anyone have any specific info on these? especially on the NullAppender?

I started looking here.

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  1. Editorial Team

    For the NullAppender, there’s not a lot of doc largely because there’s nothing to configure: you can define one with <appender name="foo" class="org.apache.log4j.varia.NullAppender"/> and that’s about it. From the Javadoc:

    A NullAppender merely exists, it never outputs a message to any device.

    There aren’t a lot a different ways to do nothing. (It exists so that you can trash output without modifying too much of your config.)

    For the JDBCAppender, the Javadoc is here: http://logging.apache.org/log4j/1.2/apidocs/org/apache/log4j/jdbc/JDBCAppender.html
    The param tags in the XML config correspond to setters in the Java class, but note the big red warning at the top of the Javadoc:

    WARNING: This version of JDBCAppender is very likely to be completely replaced in the future. Moreoever, it does not log exceptions.

    So maybe not the best class to be relying on, given that log4j v2.0 is currently in beta, and that a cursory look over the alpha release seems to indicate that it doesn’t exist in v2.

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