## Release Change Logs JIRA change log Manual change log Apache Log4j 2 is not compatible with the previous versions. Please have the following in mind when upgrading to Log4j 2 in your project: Java 6 is required The XML configuration has been simplified and is not compatible with Log4j 1.x Configuration via property files is not supported. Configuration via JSON or YAML is supported. Although Log4j 2 is not directly compatible with Log4j 1.x a compatibility bridge has been provided to reduce the need to make coding changes.