Apache Log4j Core 2.7 API

Core API 
Package Description
org.apache.logging.log4j.core
Implementation of Log4j 2.
Configuration 
Package Description
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.config.yaml
Classes and interfaces supporting configuration of Log4j 2 with YAML.
org.apache.logging.log4j.core.selector
Log4j 2 Context Selectors.
Core Plugins 
Package Description
org.apache.logging.log4j.core.appender
Log4j 2 Appenders.
org.apache.logging.log4j.core.appender.db
The classes in this package and sub packages provide appenders for various types of databases and methods for accessing databases.
org.apache.logging.log4j.core.appender.db.jdbc
The JDBC Appender supports writing log events to a relational database using standard JDBC connections.
org.apache.logging.log4j.core.appender.db.jpa
The JPA Appender supports writing log events to a relational database using the Java Persistence API.
org.apache.logging.log4j.core.appender.db.jpa.converter
The converters in this package implement the JPA 2.1 mechanism for converting non-standard types to and from database fields.
org.apache.logging.log4j.core.appender.mom
Message oriented middleware appenders.
org.apache.logging.log4j.core.appender.mom.jeromq
Classes and interfaces for ZeroMQ/JeroMQ support.
org.apache.logging.log4j.core.appender.mom.kafka
Classes and interfaces for Kafka appender support.
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.filter
Log4j 2 Filter support.
org.apache.logging.log4j.core.layout
Log4j 2 Layout support.
org.apache.logging.log4j.core.lookup
Log4j 2 Lookups.
org.apache.logging.log4j.core.pattern
Provides classes implementing format specifiers in conversion patterns.
org.apache.logging.log4j.core.script
Log4j 2 Script support.
Tools 
Package Description
org.apache.logging.log4j.core.net
Log4j 2 network support.
org.apache.logging.log4j.core.net.mom.jms
Supporting network code for JMS appenders.
org.apache.logging.log4j.core.net.server
Standalone server classes for consuming log events over a network.
org.apache.logging.log4j.core.net.ssl
Log4j 2 SSL support
org.apache.logging.log4j.core.tools
Log4j 2 command line tools.
Internals 
Package Description
org.apache.logging.log4j.core.async
Provides Asynchronous Logger classes and interfaces for low-latency logging.
org.apache.logging.log4j.core.impl
Log4j 2 private implementation classes.
org.apache.logging.log4j.core.jackson
Classes and interfaces for serializing and deserializing Log4j 2 log events to XML and JSON using the Jackson library.
org.apache.logging.log4j.core.jmx
Log4j 2 JMX support.
org.apache.logging.log4j.core.osgi
Collection of OSGi-specific classes for bundles.
org.apache.logging.log4j.core.util
Log4j 2 helper classes.
org.apache.logging.log4j.core.util.datetime
Log4j 2 date formatting classes.
Other Packages 
Package Description
org.apache.logging.log4j  

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