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Logger removeHandler() method in Java with Examples

  • Last Updated : 24 Jun, 2021

removeHandler() method of a Logger class is used to remove a log Handler from Logger. A Handler is a component of JVM that takes care of actual logging to the defined output writers like a file, console out etc. It returns silently if the given Handler is not found or is null.
Syntax: 
 

public void removeHandler(Handler handler)
                   throws SecurityException

Parameters: This method accepts one parameter handler which represents a logging Handler.
Return value: This method returns nothing.
Exception: This method throws SecurityException if a security manager exists, this logger is not anonymous, and the caller does not have LoggingPermission(“control”). 
.
Below programs illustrate the removeHandler() method: 
Program 1: 
 

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Java




// Java program to demonstrate
// Logger.removeHandler() method
 
import java.util.logging.*;
import java.io.IOException;
 
public class GFG {
 
    private static Logger logger
        = Logger.getLogger(
            GFG.class.getName());
 
    public static void main(String args[])
        throws SecurityException, IOException
    {
 
        FileHandler filehandler
            = new FileHandler("logs.txt");
 
        // Add file handler as
        // handler of logs
        logger.addHandler(filehandler);
 
        // Log message
        logger.info("This is Info Message ");
 
        // Remove file handler.
        logger.removeHandler(filehandler);
 
        logger.info("This message will "
                    + "not print on filehandler");
    }
}

Output: 
The output printed on logs.txt file is shown below- 
 



Program 2: 
 

Java




// Java program to demonstrate
// Logger.addHandler() method
 
import java.util.logging.*;
import java.io.IOException;
 
public class GFG {
 
    private static Logger logger
        = Logger.getLogger(
            GFG.class.getName());
 
    public static void main(String args[])
        throws SecurityException, IOException
    {
 
        // Create a ConsoleHandler object
        ConsoleHandler handler
            = new ConsoleHandler();
 
        // Add console handler as
        // handler of logs
        logger.addHandler(handler);
 
        // Log message
        logger.info("This is Info Message ");
 
        // Remove consolehandler
        logger.removeHandler(handler);
 
        // After removing logs print message
        logger.info("Handler removed");
    }
}

Output: 
output printed on console output is shown below- 
 

Reference: https://docs.oracle.com/javase/10/docs/api/java/util/logging/Logger.html#removeHandler(java.util.logging.Handler)
 




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