Logger removeHandler() method in Java with Examples

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 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 Messsage ");
  
        // Remove file handler.
        logger.removeHandler(filehandler);
  
        logger.info("This message will "
                    + "not print on filehandler");
    }
}

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

Program 2:

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// 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 Messsage ");
  
        // Remove consolehandler
        logger.removeHandler(handler);
  
        // After removing logs print message
        logger.info("Handler removed");
    }
}

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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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