How to use an existing Log4j Category as the Velocity logging target

/*
 * Copyright 2000-2001,2004 The Apache Software Foundation.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import org.apache.log4j.BasicConfigurator;
import org.apache.log4j.Category;
import org.apache.velocity.app.VelocityEngine;
import org.apache.velocity.runtime.RuntimeConstants;


/**
 *  Simple example class to show how to use an existing Log4j Categeory
 *  as the Velocity logging target.
 *
 * @author <a href="mailto:geirm@apache.org">Geir Magnusson Jr.</a>
 * @version $Id: Log4jCategoryExample.java,v 1.1.8.1 2004/03/04 00:18:29 geirm Exp $
 */
public class Log4jCategoryExample
{
    public static String CATEGORY_NAME = "velexample";

    public static void main( String args[] )
        throws Exception
    {
        /*
         *  configure log4j to log to console
         */

        BasicConfigurator.configure();

        Category log = Category.getInstance( CATEGORY_NAME );

        log.info("Hello from Log4jCategoryExample - ready to start velocity");

        /*
         *  now create a new VelocityEngine instance, and
         *  configure it to use the category
         */

        VelocityEngine ve = new VelocityEngine();

        ve.setProperty( RuntimeConstants.RUNTIME_LOG_LOGSYSTEM_CLASS,
            "org.apache.velocity.runtime.log.SimpleLog4JLogSystem" );

        ve.setProperty("runtime.log.logsystem.log4j.category", CATEGORY_NAME);

        ve.init();

        log.info("this should follow the initialization output from velocity");
    }
}

velocity-Log4J.zip( 2,193 k)

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How to use an existing Log4j Category as the Velocity logging target : Velocity Log « Velocity « Java

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