How to send java.util.logging to log4j?

Question

I have an existing application which does all of its logging against log4j. We use a number of other libraries that either also use log4j, or log against Commons Logging, wh

Answer 1

There is a simpler alternative than SLF4J to bridge JUL with log4j, see http://people.apache.org/~psmith/logging.apache.org/sandbox/jul-log4j-bridge/examples.html

You just have to put the jul-log4j-bridge on the classpath and add a system property:

-Djava.util.logging.manager=org.apache.logging.julbridge.JULBridgeLogManager

jul-log4j-bridge is not in Maven Central and can be fetched from this repository:

<repository>
  <id>psmith</id>
  <url>http://people.apache.org/~psmith/logging.apache.org/repo</url>
  <releases>
    <enabled>false</enabled>
  </releases>
</repository>

and then used with:

<dependency>
  <groupId>org.apache.logging</groupId>
  <artifactId>apache-jul-log4j-bridge</artifactId>
  <version>1.0.0-SNAPSHOT</version>
  <scope>test</scope>
  <exclusions>
    <exclusion>
      <groupId>log4j</groupId>
      <artifactId>apache-log4j-component</artifactId>
    </exclusion>
  </exclusions>
</dependency>

It's also possible to rebuild it from sources with the following steps:

1. svn co http://svn.apache.org/repos/asf/logging/sandbox/jul-to-log4j-bridge/
2. edit pom.xml, replace the dependency on log4j:log4j:1.2.15 with log4j:apache-log4j-extras:1.2.17 and remove the dependency on apache-log4j-component
3. mvn package