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Apache Log4j 2.x with slf4j bridges

<dependencies>
  <!-- bridges to route jul and jcl (commons-logging) are already present, so just add log4j 1.2.x one -->
  <dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>log4j-over-slf4j</artifactId>
    <version>${slf4j.version}</version>
  </dependency>

  <!-- slf4j implementation to forward logs to log4j 2.x -->
  <dependency>
    <groupId>org.apache.logging.log4j</groupId>
    <artifactId>log4j-slf4j-impl</artifactId>
    <version>${log4j2.version}</version>
  </dependency>

  <!-- logging backend: log4j 2.x -->
  <!-- this dependency declarations are optional since org.apache.logging.log4j:log4j-slf4j-impl depends on them transitively -->
  <dependency>
    <groupId>org.apache.logging.log4j</groupId>
    <artifactId>log4j-api</artifactId>
    <version>${log4j2.version></version>
  </dependency>
  <dependency>
    <groupId>org.apache.logging.log4j</groupId>
    <artifactId>log4j-core</artifactId>
    <version>${log4j2.version></version>
  </dependency>
</dependencies>

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