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XWork is an command-pattern framework that is used to power WebWork as well as other applications. XWork provides an Inversion of Control container, a powerful expression language, data type conversion, validation, and pluggable configuration.

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/*
 * Copyright (c) 2002-2006 by OpenSymphony
 * All rights reserved.
 */
package com.opensymphony.xwork2.util.logging;

/**
 * Main logger interface for logging things
 */
public interface Logger {
    void trace(String msg, String... args);
    void trace(String msg, Throwable ex, String... args);
    boolean isTraceEnabled();
    
    void debug(String msg, String... args);
    void debug(String msg, Throwable ex, String... args);
    boolean isDebugEnabled();
    
    void info(String msg, String... args);
    void info(String msg, Throwable ex, String... args);
    boolean isInfoEnabled();
    
    void warn(String msg, String... args);
    void warn(String msg, Throwable ex, String... args);
    boolean isWarnEnabled();
    
    void error(String msg, String... args);
    void error(String msg, Throwable ex, String... args);
    boolean isErrorEnabled();
    
    void fatal(String msg, String... args);
    void fatal(String msg, Throwable ex, String... args);
    boolean isFatalEnabled();
}