Examples of java.util.logging.Handler

java.util.logging.Handler
A Handler object takes log messages from a Logger and exports them. It might for example, write them to a console or write them to a file, or send them to a network logging service, or forward them to an OS log, or whatever.
A Handler can be disabled by doing a setLevel(Level.OFF) and can be re-enabled by doing a setLevel with an appropriate level.
Handler classes typically use LogManager properties to set default values for the Handler's Filter, Formatter, and Level. See the specific documentation for each concrete Handler class. @version 1.21, 04/07/06 @since 1.4

      // Remove all existing appenders from logger. They will be
      // reconstructed if need be.
      Handler[] handlers = logger.getHandlers();
      for(int n = 0; n < handlers.length; n ++)
      {
         Handler h = handlers[n];
         logger.removeHandler(h);
      }


      NodeList children = catElement.getChildNodes();
      final int length = children.getLength();


      for (int loop = 0; loop < length; loop++)
      {
         Node currentNode = children.item(loop);


         if (currentNode.getNodeType() == Node.ELEMENT_NODE)
         {
            Element currentElement = (Element) currentNode;
            String tagName = currentElement.getTagName();


            if (tagName.equals(APPENDER_REF_TAG))
            {
               Element appenderRef = (Element) currentNode;
               Handler appender = findHandlerByReference(appenderRef);
               String refName = subst(appenderRef.getAttribute(REF_ATTR));
               if (appender != null)
                  debug("Adding appender named [" + refName +
                     "] to category [" + logger.getName() + "].");
               else

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    * @param appenderName the appender name
    * @return the handler
    */
   protected Handler findHandlerByName(Document doc, String appenderName)
   {
      Handler appender = appenderBag.get(appenderName);


      if (appender != null)
      {
         return appender;
      }

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      String className = subst(appenderElement.getAttribute(CLASS_ATTR));
      debug("Class name: [" + className + ']');
      try
      {
         Object instance = instantiateByClassName(className, Handler.class, null);
         Handler appender = (Handler) instance;
         Properties beanProps = new Properties();
         String name = subst(appenderElement.getAttribute(NAME_ATTR));
         HandlerSkeleton handlerSkeleton = null;
         if( appender instanceof HandlerSkeleton )
         {
            handlerSkeleton = (HandlerSkeleton) appender;
            handlerSkeleton.setName(name);
         }


         NodeList children = appenderElement.getChildNodes();
         final int length = children.getLength();


         for (int loop = 0; loop < length; loop++)
         {
            Node currentNode = children.item(loop);


            /* We're only interested in Elements */
            if (currentNode.getNodeType() == Node.ELEMENT_NODE)
            {
               Element currentElement = (Element) currentNode;


               // Parse appender parameters 
               if (currentElement.getTagName().equals(PARAM_TAG))
               {
                  setParameter(currentElement, beanProps);
               }
               // Set appender layout
               else if (currentElement.getTagName().equals(LAYOUT_TAG))
               {
                  Formatter format = parseLayout(currentElement);
                  appender.setFormatter(format);
               }
               // Add filters
               else if (currentElement.getTagName().equals(FILTER_TAG))
               {
                  parseFilters(currentElement, appender);

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      // Remove all existing appenders from logger. They will be
      // reconstructed if need be.
      Handler[] handlers = logger.getHandlers();
      for(int n = 0; n < handlers.length; n ++)
      {
         Handler h = handlers[n];
         logger.removeHandler(h);
      }


      NodeList children = catElement.getChildNodes();
      final int length = children.getLength();


      for (int loop = 0; loop < length; loop++)
      {
         Node currentNode = children.item(loop);


         if (currentNode.getNodeType() == Node.ELEMENT_NODE)
         {
            Element currentElement = (Element) currentNode;
            String tagName = currentElement.getTagName();


            if (tagName.equals(APPENDER_REF_TAG))
            {
               Element appenderRef = (Element) currentNode;
               Handler appender = findHandlerByReference(appenderRef);
               String refName = subst(appenderRef.getAttribute(REF_ATTR));
               if (appender != null)
                  debug("Adding appender named [" + refName +
                     "] to category [" + logger.getName() + "].");
               else

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      this.verbose = verbose;
      if (verbose) 
      {
         Logger weaverLog = Logger.getLogger("org.jboss.weaver");
         weaverLog.setUseParentHandlers(false);
         Handler console = new ConsoleHandler();
         console.setLevel(Level.FINE);
         weaverLog.addHandler(console);
         weaverLog.setLevel(Level.FINE); 
      }
   }

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        if (handlers != null) {
            logger.setUseParentHandlers(false);
            StringTokenizer tok = new StringTokenizer(handlers, ",");
            while (tok.hasMoreTokens()) {
                String handlerName = (tok.nextToken().trim());
                Handler handler = null;
                ClassLoader current = classLoader;
                while (current != null) {
                    info = (ClassLoaderLogInfo) classLoaderLoggers.get(current);
                    if (info != null) {
                        handler = (Handler) info.handlers.get(handlerName);

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                                handlerClassName = handlerClassName.substring(pos + 1);
                            }
                        }
                        try {
                            this.prefix.set(prefix);
                            Handler handler = 
                                (Handler) classLoader.loadClass(handlerClassName).newInstance();
                            // The specification strongly implies all configuration should be done 
                            // during the creation of the handler object.
                            // This includes setting level, filter, formatter and encoding.
                            this.prefix.set(null);
                            info.handlers.put(handlerName, handler);
                            if (rootHandlers == null) {
                                localRootLogger.addHandler(handler);
                            }
                        } catch (Exception e) {
                            // Report error
                            System.err.println("Handler error");
                            e.printStackTrace();
                        }
                    }
                    
                    // Add handlers to the root logger, if any are defined using the .handlers property.
                    if (rootHandlers != null) {
                        StringTokenizer tok2 = new StringTokenizer(rootHandlers, ",");
                        while (tok2.hasMoreTokens()) {
                            String handlerName = (tok2.nextToken().trim());
                            Handler handler = (Handler) info.handlers.get(handlerName);
                            if (handler != null) {
                                localRootLogger.addHandler(handler);
                            }
                        }
                    }

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                return;
            isConfigured = true;
            // XXX first set new formatter to (default) console handler(s)
            Handler[] handlers = Logger.getLogger("").getHandlers();
            for (int i = 0; i < handlers.length; i++) {
                Handler handler = handlers[i];
                if (handler instanceof ConsoleHandler) {
                    handler.setFormatter(new ConsoleLogfileFormatter());
                    handler.setLevel(logToConsoleThreshold);
                    // could exit loop here, but keep on going for robustness (might be more than on handler)
                }
            }
            // set default logging
            Logger.getLogger("").setLevel(logLevel);
            Handler fileHandler = new FileHandler(logFilePath);
            fileHandler.setFormatter(DETAIL_FORMATTER);
            Logger.getLogger("").addHandler(fileHandler);
            logger.log(Level.INFO, "Logging Service configured");
        } catch (IOException ioe) {
            logger.log(Level.WARNING, "Could not set logging configuration", ioe);
        }

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//            Thread.currentThread().setContextClassLoader(ShapefileRenderer.class.getClassLoader());
            Thread.currentThread().setContextClassLoader(StreamingRenderer.class.getClassLoader());
            Logger logger = Logger.getLogger("org.geotools.renderer.shape");//$NON-NLS-1$
            if (isDebugging("org.locationtech.udig.render.feature.shapefile/finest")) { //$NON-NLS-1$
                logger.setLevel(Level.FINEST);
                logger.addHandler(new Handler(){
                    @Override
                    public void publish( LogRecord record ) {
                        System.err.println(record.getMessage());
                    }
                    @Override

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        try {
            Thread.currentThread().setContextClassLoader(WebMapServer.class.getClassLoader());
            Logger logger = Logger.getLogger("org.geotools.data.ows");//$NON-NLS-1$
            if (WMSPlugin.isDebugging(Trace.RENDER)) {
                logger.setLevel(Level.FINE);
                logger.addHandler(new Handler(){


                    @Override
                    public void publish( LogRecord record ) {
                        System.err.println(record.getMessage());
                    }

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