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some utility class for java develop
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package com.star.log.dialect.log4j;

import com.star.log.AbstractLocationAwareLog;
import com.star.string.StringUtil;
import org.apache.log4j.Level;
import org.apache.log4j.Logger;

/**
 * Apache Log4J log.

 *
 * @author Looly
 */
public class Log4jLog extends AbstractLocationAwareLog {
    private static final long serialVersionUID = -6843151523380063975L;
    private static final String FQCN = Log4jLog.class.getName();

    private final transient Logger logger;

    // ------------------------------------------------------------------------- Constructor
    public Log4jLog(Logger logger) {
        this.logger = logger;
    }

    public Log4jLog(Class clazz) {
        this(Logger.getLogger(clazz));
    }

    public Log4jLog(String name) {
        this(Logger.getLogger(name));
    }

    @Override
    public String getName() {
        return logger.getName();
    }

    // ------------------------------------------------------------------------- Trace
    @Override
    public boolean isTraceEnabled() {
        return logger.isTraceEnabled();
    }

    @Override
    public void trace(String format, Object... arguments) {
        trace(null, format, arguments);
    }

    @Override
    public void trace(Throwable t, String format, Object... arguments) {
        logger.log(FQCN, Level.TRACE, StringUtil.format(format, arguments), t);
    }

    // ------------------------------------------------------------------------- Debug
    @Override
    public boolean isDebugEnabled() {
        return logger.isDebugEnabled();
    }

    @Override
    public void debug(String format, Object... arguments) {
        debug(null, format, arguments);
    }

    @Override
    public void debug(Throwable t, String format, Object... arguments) {
        logger.log(FQCN, Level.DEBUG, StringUtil.format(format, arguments), t);
    }

    // ------------------------------------------------------------------------- Info
    @Override
    public boolean isInfoEnabled() {
        return logger.isInfoEnabled();
    }

    @Override
    public void info(String format, Object... arguments) {
        info(null, format, arguments);
    }

    @Override
    public void info(Throwable t, String format, Object... arguments) {
        logger.log(FQCN, Level.INFO, StringUtil.format(format, arguments), t);
    }

    // ------------------------------------------------------------------------- Warn
    @Override
    public boolean isWarnEnabled() {
        return logger.isEnabledFor(Level.WARN);
    }

    @Override
    public void warn(String format, Object... arguments) {
        warn(null, format, arguments);
    }

    @Override
    public void warn(Throwable t, String format, Object... arguments) {
        logger.log(FQCN, Level.WARN, StringUtil.format(format, arguments), t);
    }

    // ------------------------------------------------------------------------- Error
    @Override
    public boolean isErrorEnabled() {
        return logger.isEnabledFor(Level.ERROR);
    }

    @Override
    public void error(String format, Object... arguments) {
        error(null, format, arguments);
    }

    @Override
    public void error(Throwable t, String format, Object... arguments) {
        logger.log(FQCN, Level.ERROR, StringUtil.format(format, arguments), t);
    }

    // ------------------------------------------------------------------------- Log
    @Override
    public void log(com.star.log.level.Level level, String format, Object... arguments) {
        log(level, null, format, arguments);
    }

    @Override
    public void log(com.star.log.level.Level level, Throwable t, String format, Object... arguments) {
        this.log(FQCN, level, t, format, arguments);
    }

    @Override
    public void log(String fqcn, com.star.log.level.Level level, Throwable t, String format, Object... arguments) {
        Level log4jLevel;
        switch (level) {
            case TRACE:
                log4jLevel = Level.TRACE;
                break;
            case DEBUG:
                log4jLevel = Level.DEBUG;
                break;
            case INFO:
                log4jLevel = Level.INFO;
                break;
            case WARN:
                log4jLevel = Level.WARN;
                break;
            case ERROR:
                log4jLevel = Level.ERROR;
                break;
            default:
                throw new Error(StringUtil.format("Can not identify level: {}", level));
        }
        logger.log(fqcn, log4jLevel, StringUtil.format(format, arguments), t);
    }

    // ------------------------------------------------------------------------- Private method
}