org.slf4j.bridge

Class 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 voidcallLocationAwareLogger(LocationAwareLogger lal, LogRecord record)
protected voidcallPlainSLF4JLogger(Logger slf4jLogger, LogRecord record)
voidclose()
No-op implementation.
voidflush()
No-op implementation.
protected LoggergetSLF4JLogger(LogRecord record)
Return the Logger instance that will be used for logging.
static voidinstall()
Adds a SLF4JBridgeHandler instance to jul's root logger.
voidpublish(LogRecord record)
Publish a LogRecord.
static voiduninstall()
Removes previously installed SLF4JBridgeHandler instances.

Constructor Detail

SLF4JBridgeHandler

public SLF4JBridgeHandler()
Initialize this handler.

Method Detail

callLocationAwareLogger

protected void callLocationAwareLogger(LocationAwareLogger lal, LogRecord record)

callPlainSLF4JLogger

protected void callPlainSLF4JLogger(Logger slf4jLogger, LogRecord record)

close

public void close()
No-op implementation.

flush

public void flush()
No-op implementation.

getSLF4JLogger

protected Logger getSLF4JLogger(LogRecord record)
Return the Logger instance that will be used for logging.

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.

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.

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

uninstall

public static void uninstall()
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").

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