[LOG4J2-2621] Create log4j-plugins module and use ServiceLoader to load plugins

• Type: Task
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.0.0
• Component/s: Plugins
• Assignee: Ralph Goers
• Reporter: Ralph Goers
• Created: 02/Jun/19 20:17
• Updated: 23/Jun/19 08:21
• Resolved: 15/Jun/19 21:06

Description

As part of splitting log4j 2 into smaller components it is clear that the plugin system, and especially the annotation processor, could be split into a separate module. Also, to be more compliant with the Java module system it might be beneficial to generate a Class file with all the plugin information instead of the data file currently being generated.

Moving the plugins to a separate module is going to impact anyone who has created a Log4j 2 plugin as the package for the plugin annotations must change.

Issue Links

• is related to: LOG4J2-673 plugin preloading fails in shaded jar files
• relates to: LOG4J2-954 log4j-slf4j-impl 2.1 leads to errors
• relates to: LOG4J2-369 How to include the log4j2 lib jar into a jar with my application class and run it ?
• relates to: LOG4J2-1852 Plugins lookup by package is not compatible with Spring Boot jar packaging
• relates to: LOG4J2-2604 Generate reflect-config.json for GraalVM during annotation processing