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Java 1.6+ Library with tons of utility classes required in all projects
There is a newer version: 9.5.5
/**
 * Copyright (C) 2014-2016 Philip Helger (www.helger.com)
 * philip[at]helger[dot]com
 *
 * 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.
 */
package com.helger.commons.debug;

import java.util.concurrent.atomic.AtomicBoolean;

import javax.annotation.concurrent.ThreadSafe;

import com.helger.commons.system.SystemProperties;

/**
 * Global class for handling the following typical application modes:
 * 
 * trace
 * debug
 * production
 * 
 * trace is the lowest mode, debug is one level higher and production is the
 * highest value. By default all modes are deactivated.
 *
 * @author Philip
 */
@ThreadSafe
public final class GlobalDebug
{
  /**
   * By default debug mode is enabled
   */
  public static final boolean DEFAULT_DEBUG_MODE = true;
  /**
   * By default production mode is disable
   */
  public static final boolean DEFAULT_PRODUCTION_MODE = false;

  public static final String SYSTEM_PROPERTY_MAIL_DEBUG = "mail.debug";
  public static final String SYSTEM_PROPERTY_JAVAX_ACTIVATION_DEBUG = "javax.activation.debug";
  public static final String SYSTEM_PROPERTY_JAXP_DEBUG = "jaxp.debug";

  private static final AtomicBoolean s_aDebugMode = new AtomicBoolean (DEFAULT_DEBUG_MODE);
  private static final AtomicBoolean s_aProductionMode = new AtomicBoolean (DEFAULT_PRODUCTION_MODE);

  // to set it per dependency injection
  public void setDebugMode (final boolean bDebugMode)
  {
    setDebugModeDirect (bDebugMode);
  }

  // to set it per dependency injection
  public void setProductionMode (final boolean bProductionMode)
  {
    setProductionModeDirect (bProductionMode);
  }

  /**
   * Set the debug mode for the common Java components:
   * 
   * JAXP
   * Javax Activation
   * Javax Mail
   * 
   *
   * @param bDebugMode
   *        true to enable debug mode, false to
   *        disable it
   */
  public static void setJavaCommonComponentsDebugMode (final boolean bDebugMode)
  {
    // Set JAXP debugging!
    // Note: this property is read-only on Ubuntu, defined by the following
    // policy file: /etc/tomcat6/policy.d/04webapps.policy
    SystemProperties.setPropertyValue (SYSTEM_PROPERTY_JAXP_DEBUG, bDebugMode);

    // Set javax.activation debugging
    SystemProperties.setPropertyValue (SYSTEM_PROPERTY_JAVAX_ACTIVATION_DEBUG, bDebugMode);

    // Set javax.mail debugging
    SystemProperties.setPropertyValue (SYSTEM_PROPERTY_MAIL_DEBUG, bDebugMode);
  }

  /**
   * Enable or disable debug mode. If debug mode is disabled, also trace mode is
   * disabled.
   *
   * @param bDebugMode
   *        true to enable, false to disable
   */
  public static void setDebugModeDirect (final boolean bDebugMode)
  {
    s_aDebugMode.set (bDebugMode);

    setJavaCommonComponentsDebugMode (bDebugMode);
  }

  /**
   * Enable or disable production mode. If production mode is enabled, also
   * trace mode and debug mode are disabled.
   *
   * @param bProductionMode
   *        true to enable, false to disable
   */
  public static void setProductionModeDirect (final boolean bProductionMode)
  {
    s_aProductionMode.set (bProductionMode);

    // If enabling production mode, disable debug mode
    if (bProductionMode)
      setDebugModeDirect (false);
  }

  /**
   * @return true if debug mode is active, false if
   *         not
   */
  public static boolean isDebugMode ()
  {
    return s_aDebugMode.get ();
  }

  /**
   * @return true if production mode is active, false
   *         if not
   */
  public static boolean isProductionMode ()
  {
    return s_aProductionMode.get ();
  }
}