The logging API is part of J2SE as of JDK 1.4, and it ships with the JDK. It is designed to let a Java program, servlet, applet, EJB, etc. produce messages of interest to end users, system administrators, field engineers, and software developers. Especially in production situations, where things can't be run in a debugger, or if doing so masks the problem that is occurring (because it is timing related, for example), such logs are frequently the greatest (and sometimes the only) source of information about a running program.
The entire logging API is contained in the package java.util.logging and is made up of the following interfaces and classes:
ConsoleHandlerFileHanderFilterFormatterHandlerLevelLoggerLoggingPermissionLogManagerLogRecordMemoryHandlerSimpleFormatterSocketHandlerStreamHandlerXMLFormatter
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