| Framework |
Supported log levels |
Standard appenders |
Popularity |
Cost / licence |
| Log4J |
FATAL ERROR WARN INFO DEBUG TRACE |
AsyncAppender, JDBCAppender, JMSAppender, LF5Appender,
NTEventLogAppender, NullAppender, SMTPAppender, SocketAppender,
SocketHubAppender, SyslogAppender, TelnetAppender, WriterAppender |
Widely used in many project and platforms |
Apache License, Version 2.0 |
| Java Logging API |
SEVERE WARNING INFO CONFIG FINE FINER FINEST |
Depends on the underlying framework; Sun's default Java Virtual
Machine (JVM) has the following: ConsoleHandler, FileHandler,
SocketHandler, MemoryHandler |
Not widely used[citation needed] |
Comes with the JRE |
| Apache Commons Logging |
FATAL ERROR WARN INFO DEBUG TRACE |
Depends on the underlying framework |
Widely used, in conjunction with log4j |
Apache License, Version 2.0 |
| SLF4J |
ERROR WARN INFO DEBUG TRACE |
Depends on the underlying framework, which is pluggable |
Probably small but growing |
MIT License |