org.slf4j.bridge
Class SLF4JBridgeHandler

java.lang.Object
  java.util.logging.Handler
      org.slf4j.bridge.SLF4JBridgeHandler

public class SLF4JBridgeHandler
extends Handler

Bridge/route all JUL log records to the SLF4J API.

Essentially, the idea is to install on the root logger an instance of SLF4JBridgeHandler as the sole JUL handler in the system. Subsequently, the SLF4JBridgeHandler instance will redirect all JUL log records are redirected to the SLF4J API based on the following mapping of levels:

 FINEST  -> TRACE
 FINER   -> DEBUG
 FINE    -> DEBUG
 INFO    -> INFO
 WARNING -> WARN
 SEVER   -> ERROR
 

Usage:

 // call only once during initialization time of your application
 SLF4JBridgeHandler.install();
 
 // usual pattern: get a Logger and then log a message
 java.util.logging.Logger julLogger = java.util.logging.Logger
     .getLogger("org.wombat");
 julLogger.fine("hello world"); // this will get redirected to SLF4J
 

Since:

1.5.1

Author:

Christian Stein, Joern Huxhorn, Ceki Gülcü, Darryl Smith

Constructor Summary

SLF4JBridgeHandler()
Initialize this handler.

Method Summary

protected void	callLocationAwareLogger(LocationAwareLogger lal, LogRecord record)
protected void	callPlainSLF4JLogger(Logger slf4jLogger, LogRecord record)
void	close() No-op implementation.
void	flush() No-op implementation.
protected Logger	getSLF4JLogger(LogRecord record) Return the Logger instance that will be used for logging.
static void	install() Adds a SLF4JBridgeHandler instance to jul's root logger.
void	publish(LogRecord record) Publish a LogRecord.
static void	uninstall() Removes previously installed SLF4JBridgeHandler instances.

Methods inherited from class java.util.logging.Handler

getEncoding, getErrorManager, getFilter, getFormatter, getLevel, isLoggable, reportError, setEncoding, setErrorManager, setFilter, setFormatter, setLevel

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

SLF4JBridgeHandler

public SLF4JBridgeHandler()

Initialize this handler.

Method Detail

install

public static void install()

Adds a SLF4JBridgeHandler instance to jul's root logger.

This handler will redirect jul logging to SLF4J. However, only logs enabled in j.u.l. will be redirected. For example, if a log statement invoking a j.u.l. logger disabled that statement, by definition, will not reach any SLF4JBridgeHandler instance and cannot be redirected.

uninstall

public static void uninstall()
                      throws SecurityException

Removes previously installed SLF4JBridgeHandler instances. See also install().

Throws:

SecurityException - A SecurityException is thrown, if a security manager exists and if the caller does not have LoggingPermission("control").

close

public void close()

No-op implementation.

Specified by:

close in class Handler

flush

public void flush()

No-op implementation.

Specified by:

flush in class Handler

getSLF4JLogger

protected Logger getSLF4JLogger(LogRecord record)

Return the Logger instance that will be used for logging.

callLocationAwareLogger

protected void callLocationAwareLogger(LocationAwareLogger lal,
                                       LogRecord record)

callPlainSLF4JLogger

protected void callPlainSLF4JLogger(Logger slf4jLogger,
                                    LogRecord record)

publish

public void publish(LogRecord record)

Publish a LogRecord.

The logging request was made initially to a Logger object, which initialized the LogRecord and forwarded it here.

This handler ignores the Level attached to the LogRecord, as SLF4J cares about discarding log statements.

Specified by:

publish in class Handler

Parameters:

record - Description of the log event. A null record is silently ignored and is not published.