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• SpringApplication.java

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/*
 * Copyright 2012-2014 the original author or authors.
 *
 * 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 org.springframework.boot;

import java.lang.reflect.Constructor;
import java.nio.charset.Charset;
import java.security.AccessControlException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.Set;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.groovy.GroovyBeanDefinitionReader;
import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.beans.factory.support.BeanNameGenerator;
import org.springframework.beans.factory.xml.XmlBeanDefinitionReader;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextInitializer;
import org.springframework.context.ApplicationListener;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.context.annotation.AnnotatedBeanDefinitionReader;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.annotation.AnnotationConfigUtils;
import org.springframework.context.annotation.ClassPathBeanDefinitionScanner;
import org.springframework.context.support.AbstractApplicationContext;
import org.springframework.context.support.GenericApplicationContext;
import org.springframework.core.GenericTypeResolver;
import org.springframework.core.annotation.AnnotationAwareOrderComparator;
import org.springframework.core.env.CommandLinePropertySource;
import org.springframework.core.env.CompositePropertySource;
import org.springframework.core.env.ConfigurableEnvironment;
import org.springframework.core.env.Environment;
import org.springframework.core.env.MapPropertySource;
import org.springframework.core.env.MutablePropertySources;
import org.springframework.core.env.PropertySource;
import org.springframework.core.env.SimpleCommandLinePropertySource;
import org.springframework.core.env.StandardEnvironment;
import org.springframework.core.io.DefaultResourceLoader;
import org.springframework.core.io.Resource;
import org.springframework.core.io.ResourceLoader;
import org.springframework.core.io.support.SpringFactoriesLoader;
import org.springframework.util.Assert;
import org.springframework.util.ClassUtils;
import org.springframework.util.ReflectionUtils;
import org.springframework.util.StopWatch;
import org.springframework.util.StreamUtils;
import org.springframework.util.StringUtils;
import org.springframework.web.context.ConfigurableWebApplicationContext;
import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.context.support.StandardServletEnvironment;

/**
 * Classes that can be used to bootstrap and launch a Spring application from a Java main
 * method. By default class will perform the following steps to bootstrap your
 * application:
 *
 * 

 * 
Create an appropriate {@link ApplicationContext} instance (depending on your
 * classpath)
 *
 * 
Register a {@link CommandLinePropertySource} to expose command line arguments as
 * Spring properties
 *
 * 
Refresh the application context, loading all singleton beans
 *
 * 
Trigger any {@link CommandLineRunner} beans
 * 
 *
 * In most circumstances the static {@link #run(Object, String[])} method can be called
 * directly from your {@literal main} method to bootstrap your application:
 *
 * 
 * @Configuration
 * @EnableAutoConfiguration
 * public class MyApplication  {
 *
 * // ... Bean definitions
 *
 * public static void main(String[] args) throws Exception {
 *   SpringApplication.run(MyApplication.class, args);
 * }
 * 
 *
 * 

 * For more advanced configuration a {@link SpringApplication} instance can be created and
 * customized before being run:
 *
 * 
 * public static void main(String[] args) throws Exception {
 *   SpringApplication app = new SpringApplication(MyApplication.class);
 *   // ... customize app settings here
 *   app.run(args)
 * }
 * 
 *
 * {@link SpringApplication}s can read beans from a variety of different sources. It is
 * generally recommended that a single {@code @Configuration} class is used to bootstrap
 * your application, however, any of the following sources can also be used:
 *
 * 

 * 

 * 
{@link Class} - A Java class to be loaded by {@link AnnotatedBeanDefinitionReader}
 *
 * 
{@link Resource} - An XML resource to be loaded by {@link XmlBeanDefinitionReader},
 * or a groovy script to be loaded by {@link GroovyBeanDefinitionReader}
 *
 * 
{@link Package} - A Java package to be scanned by
 * {@link ClassPathBeanDefinitionScanner}
 *
 * 
{@link CharSequence} - A class name, resource handle or package name to loaded as
 * appropriate. If the {@link CharSequence} cannot be resolved to class and does not
 * resolve to a {@link Resource} that exists it will be considered a {@link Package}.
 * 
 *
 * @author Phillip Webb
 * @author Dave Syer
 * @author Andy Wilkinson
 * @author Christian Dupuis
 * @see #run(Object, String[])
 * @see #run(Object[], String[])
 * @see #SpringApplication(Object...)
 */
public class SpringApplication {

	private static final String DEFAULT_CONTEXT_CLASS = "org.springframework.context."
			+ "annotation.AnnotationConfigApplicationContext";

	public static final String DEFAULT_WEB_CONTEXT_CLASS = "org.springframework."
			+ "boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext";

	private static final String[] WEB_ENVIRONMENT_CLASSES = { "javax.servlet.Servlet",
			"org.springframework.web.context.ConfigurableWebApplicationContext" };

	private static final String SYSTEM_PROPERTY_JAVA_AWT_HEADLESS = "java.awt.headless";

	private final Log log = LogFactory.getLog(getClass());

	private final Set