Packages 
Package Description
org.apache.log4j
Log4j 1.x compatibility layer.
org.apache.log4j.bridge  
org.apache.log4j.builders  
org.apache.log4j.builders.appender  
org.apache.log4j.builders.filter  
org.apache.log4j.builders.layout  
org.apache.log4j.builders.rewrite  
org.apache.log4j.config
Log4j 1.x compatibility layer.
org.apache.log4j.helpers
Log4j 1.x compatibility layer.
org.apache.log4j.layout  
org.apache.log4j.legacy.core  
org.apache.log4j.or  
org.apache.log4j.pattern  
org.apache.log4j.rewrite  
org.apache.log4j.spi
Log4j 1.x compatibility layer.
org.apache.log4j.xml
Log4j 1.x compatibility layer.
org.apache.logging.log4j
Public API for Log4j 2.
org.apache.logging.log4j.core
Implementation of Log4j 2.
org.apache.logging.log4j.core.appender
Log4j 2 Appenders.
org.apache.logging.log4j.core.appender.rewrite
Apache Flume Appender.
org.apache.logging.log4j.core.appender.rolling
Rolling File Appender and support classes.
org.apache.logging.log4j.core.appender.rolling.action
Support classes for the Rolling File Appender.
org.apache.logging.log4j.core.appender.routing
Apache Flume Appender.
org.apache.logging.log4j.core.async
Provides Asynchronous Logger classes and interfaces for low-latency logging.
org.apache.logging.log4j.core.config
Configuration of Log4j 2.
org.apache.logging.log4j.core.config.builder.api
Configuration Builder API for programmatically configuring Log4j.
org.apache.logging.log4j.core.config.builder.impl
Configuration Builder Implementation.
org.apache.logging.log4j.core.config.composite
Support for composite configurations.
org.apache.logging.log4j.core.config.json
Classes and interfaces supporting configuration of Log4j 2 with JSON.
org.apache.logging.log4j.core.config.plugins
Annotations for Log4j 2 plugins.
org.apache.logging.log4j.core.config.plugins.convert
TypeConverter plugins for converter strings into various types.
org.apache.logging.log4j.core.config.plugins.processor
Java annotation processor for pre-scanning Log4j 2 plugins.
org.apache.logging.log4j.core.config.plugins.util
Utility and manager classes for Log4j 2 plugins.
org.apache.logging.log4j.core.config.plugins.validation
Constraint validators for plugin factory methods.
org.apache.logging.log4j.core.config.plugins.validation.constraints
Validation annotations.
org.apache.logging.log4j.core.config.plugins.validation.validators
ConstraintValidator implementations for the constraint annotations.
org.apache.logging.log4j.core.config.plugins.visitors
Visitor classes for extracting values from a Configuration or Node corresponding to a plugin annotation.
org.apache.logging.log4j.core.config.properties
Configuration using Properties files.
org.apache.logging.log4j.core.config.status
Configuration classes for the StatusLogger API.
org.apache.logging.log4j.core.config.xml
Classes and interfaces supporting configuration of Log4j 2 with XML.
org.apache.logging.log4j.core.filter
Log4j 2 Filter support.
org.apache.logging.log4j.core.impl
Log4j 2 private implementation classes.
org.apache.logging.log4j.core.jmx
Log4j 2 JMX support.
org.apache.logging.log4j.core.layout
Log4j 2 Layout support.
org.apache.logging.log4j.core.layout.internal  
org.apache.logging.log4j.core.lookup
Log4j 2 Lookups.
org.apache.logging.log4j.core.message  
org.apache.logging.log4j.core.net
Log4j 2 network support.
org.apache.logging.log4j.core.net.ssl
Log4j 2 SSL support
org.apache.logging.log4j.core.osgi
Collection of OSGi-specific classes for bundles.
org.apache.logging.log4j.core.pattern
Provides classes implementing format specifiers in conversion patterns.
org.apache.logging.log4j.core.script
Log4j 2 Script support.
org.apache.logging.log4j.core.selector
Log4j 2 Context Selectors.
org.apache.logging.log4j.core.time  
org.apache.logging.log4j.core.time.internal  
org.apache.logging.log4j.core.tools
Log4j 2 command line tools.
org.apache.logging.log4j.core.tools.picocli  
org.apache.logging.log4j.core.util
Log4j 2 helper classes.
org.apache.logging.log4j.core.util.datetime
Log4j 2 date formatting classes.
org.apache.logging.log4j.docker  
org.apache.logging.log4j.docker.model  
org.apache.logging.log4j.internal  
org.apache.logging.log4j.jcl
Log4j 2 adapter for Commons Logging.
org.apache.logging.log4j.message
Public Message Types used for Log4j 2.
org.apache.logging.log4j.simple
Simple logging implementation.
org.apache.logging.log4j.spi
Internal interfaces and classes to be used by authors of logging implementations or for internal use by API classes.
org.apache.logging.log4j.status
Status API for Log4j 2.
org.apache.logging.log4j.util
Internal utility classes for the Log4j 2 API.
org.apache.logging.slf4j
SLF4J support.
org.slf4j.impl
Log4j 2.0 SLF4J Binding.