Java tutorial
/* * Copyright 2002-2013 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 com.dhcc.framework.web.context; import java.io.IOException; import java.sql.Connection; import java.sql.DriverManager; import java.sql.SQLException; import java.util.ArrayList; import java.util.Collections; import java.util.List; import java.util.Map; import java.util.Properties; import java.util.concurrent.ConcurrentHashMap; import javax.servlet.ServletContext; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.springframework.beans.BeanUtils; import org.springframework.beans.factory.access.BeanFactoryLocator; import org.springframework.beans.factory.access.BeanFactoryReference; import org.springframework.context.ApplicationContext; import org.springframework.context.ApplicationContextException; import org.springframework.context.ApplicationContextInitializer; import org.springframework.context.ConfigurableApplicationContext; import org.springframework.context.access.ContextSingletonBeanFactoryLocator; import org.springframework.core.GenericTypeResolver; import org.springframework.core.annotation.AnnotationAwareOrderComparator; import org.springframework.core.env.ConfigurableEnvironment; import org.springframework.core.io.ClassPathResource; import org.springframework.core.io.support.PropertiesLoaderUtils; import org.springframework.util.Assert; import org.springframework.util.ClassUtils; import org.springframework.util.ObjectUtils; import org.springframework.util.StringUtils; import org.springframework.web.context.ConfigurableWebApplicationContext; import org.springframework.web.context.ConfigurableWebEnvironment; import org.springframework.web.context.WebApplicationContext; /** * Performs the actual initialization work for the root application context. * Called by {@link DhccContextLoaderListener}. * * <p>Looks for a {@link #CONTEXT_CLASS_PARAM "contextClass"} parameter * at the {@code web.xml} context-param level to specify the context * class type, falling back to the default of * {@link org.springframework.web.context.support.XmlWebApplicationContext} * if not found. With the default ContextLoader implementation, any context class * specified needs to implement the ConfigurableWebApplicationContext interface. * * <p>Processes a {@link #CONFIG_LOCATION_PARAM "contextConfigLocation"} * context-param and passes its value to the context instance, parsing it into * potentially multiple file paths which can be separated by any number of * commas and spaces, e.g. "WEB-INF/applicationContext1.xml, * WEB-INF/applicationContext2.xml". Ant-style path patterns are supported as well, * e.g. "WEB-INF/*Context.xml,WEB-INF/spring*.xml" or "WEB-INF/**/*Context.xml". * If not explicitly specified, the context implementation is supposed to use a * default location (with XmlWebApplicationContext: "/WEB-INF/applicationContext.xml"). * * <p>Note: In case of multiple config locations, later bean definitions will * override ones defined in previously loaded files, at least when using one of * Spring's default ApplicationContext implementations. This can be leveraged * to deliberately override certain bean definitions via an extra XML file. * * <p>Above and beyond loading the root application context, this class * can optionally load or obtain and hook up a shared parent context to * the root application context. See the * {@link #loadParentContext(ServletContext)} method for more information. * * <p>As of Spring 3.1, {@code ContextLoader} supports injecting the root web * application context via the {@link #ContextLoader(WebApplicationContext)} * constructor, allowing for programmatic configuration in Servlet 3.0+ environments. See * {@link org.springframework.web.WebApplicationInitializer} for usage examples. * * @author Juergen Hoeller * @author Colin Sampaleanu * @author Sam Brannen * @since 17.02.2003 * @see DhccContextLoaderListener * @see ConfigurableWebApplicationContext * @see org.springframework.web.context.support.XmlWebApplicationContext */ public class DhccContextLoader { /** * Config param for the root WebApplicationContext implementation class to use: {@value} * @see #determineContextClass(ServletContext) * @see #createWebApplicationContext(ServletContext, ApplicationContext) */ public static final String CONTEXT_CLASS_PARAM = "contextClass"; /** * Config param for the root WebApplicationContext id, * to be used as serialization id for the underlying BeanFactory: {@value} */ public static final String CONTEXT_ID_PARAM = "contextId"; /** * Config param for which {@link ApplicationContextInitializer} classes to use * for initializing the web application context: {@value} * @see #customizeContext(ServletContext, ConfigurableWebApplicationContext) */ public static final String CONTEXT_INITIALIZER_CLASSES_PARAM = "contextInitializerClasses"; /** * Name of servlet context parameter (i.e., {@value}) that can specify the * config location for the root context, falling back to the implementation's * default otherwise. * @see org.springframework.web.context.support.XmlWebApplicationContext#DEFAULT_CONFIG_LOCATION */ public static final String CONFIG_LOCATION_PARAM = "contextConfigLocation"; /** * Optional servlet context parameter (i.e., "{@code locatorFactorySelector}") * used only when obtaining a parent context using the default implementation * of {@link #loadParentContext(ServletContext servletContext)}. * Specifies the 'selector' used in the * {@link ContextSingletonBeanFactoryLocator#getInstance(String selector)} * method call, which is used to obtain the BeanFactoryLocator instance from * which the parent context is obtained. * <p>The default is {@code classpath*:beanRefContext.xml}, * matching the default applied for the * {@link ContextSingletonBeanFactoryLocator#getInstance()} method. * Supplying the "parentContextKey" parameter is sufficient in this case. */ public static final String LOCATOR_FACTORY_SELECTOR_PARAM = "locatorFactorySelector"; /** * Optional servlet context parameter (i.e., "{@code parentContextKey}") * used only when obtaining a parent context using the default implementation * of {@link #loadParentContext(ServletContext servletContext)}. * Specifies the 'factoryKey' used in the * {@link BeanFactoryLocator#useBeanFactory(String factoryKey)} method call, * obtaining the parent application context from the BeanFactoryLocator instance. * <p>Supplying this "parentContextKey" parameter is sufficient when relying * on the default {@code classpath*:beanRefContext.xml} selector for * candidate factory references. */ public static final String LOCATOR_FACTORY_KEY_PARAM = "parentContextKey"; /** * Name of the class path resource (relative to the ContextLoader class) * that defines ContextLoader's default strategy names. */ private static final String DEFAULT_STRATEGIES_PATH = "ContextLoader.properties"; private static Properties defaultStrategies; static { // Load default strategy implementations from properties file. // This is currently strictly internal and not meant to be customized // by application developers. try { ClassPathResource resource = new ClassPathResource(DEFAULT_STRATEGIES_PATH, DhccContextLoader.class); defaultStrategies = PropertiesLoaderUtils.loadProperties(resource); } catch (IOException ex) { defaultStrategies = new Properties(); String key = "org.springframework.web.context.WebApplicationContext"; String value = "org.springframework.web.context.support.XmlWebApplicationContext"; defaultStrategies.put(key, value); //throw new IllegalStateException("Could not load 'ContextLoader.properties': " + ex.getMessage()); } } /** * Map from (thread context) ClassLoader to corresponding 'current' WebApplicationContext. */ private static final Map<ClassLoader, WebApplicationContext> currentContextPerThread = new ConcurrentHashMap<ClassLoader, WebApplicationContext>( 1); /** * The 'current' WebApplicationContext, if the ContextLoader class is * deployed in the web app ClassLoader itself. */ private static volatile WebApplicationContext currentContext; /** * The root WebApplicationContext instance that this loader manages. */ private WebApplicationContext context; /** * Holds BeanFactoryReference when loading parent factory via * ContextSingletonBeanFactoryLocator. */ private BeanFactoryReference parentContextRef; /** * Create a new {@code ContextLoader} that will create a web application context * based on the "contextClass" and "contextConfigLocation" servlet context-params. * See class-level documentation for details on default values for each. * <p>This constructor is typically used when declaring the {@code * ContextLoaderListener} subclass as a {@code <listener>} within {@code web.xml}, as * a no-arg constructor is required. * <p>The created application context will be registered into the ServletContext under * the attribute name {@link WebApplicationContext#ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE} * and subclasses are free to call the {@link #closeWebApplicationContext} method on * container shutdown to close the application context. * @see #ContextLoader(WebApplicationContext) * @see #initWebApplicationContext(ServletContext) * @see #closeWebApplicationContext(ServletContext) */ public DhccContextLoader() { } /** * Create a new {@code ContextLoader} with the given application context. This * constructor is useful in Servlet 3.0+ environments where instance-based * registration of listeners is possible through the {@link ServletContext#addListener} * API. * <p>The context may or may not yet be {@linkplain * ConfigurableApplicationContext#refresh() refreshed}. If it (a) is an implementation * of {@link ConfigurableWebApplicationContext} and (b) has <strong>not</strong> * already been refreshed (the recommended approach), then the following will occur: * <ul> * <li>If the given context has not already been assigned an {@linkplain * ConfigurableApplicationContext#setId id}, one will be assigned to it</li> * <li>{@code ServletContext} and {@code ServletConfig} objects will be delegated to * the application context</li> * <li>{@link #customizeContext} will be called</li> * <li>Any {@link ApplicationContextInitializer}s specified through the * "contextInitializerClasses" init-param will be applied.</li> * <li>{@link ConfigurableApplicationContext#refresh refresh()} will be called</li> * </ul> * If the context has already been refreshed or does not implement * {@code ConfigurableWebApplicationContext}, none of the above will occur under the * assumption that the user has performed these actions (or not) per his or her * specific needs. * <p>See {@link org.springframework.web.WebApplicationInitializer} for usage examples. * <p>In any case, the given application context will be registered into the * ServletContext under the attribute name {@link * WebApplicationContext#ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE} and subclasses are * free to call the {@link #closeWebApplicationContext} method on container shutdown * to close the application context. * @param context the application context to manage * @see #initWebApplicationContext(ServletContext) * @see #closeWebApplicationContext(ServletContext) */ public DhccContextLoader(WebApplicationContext context) { this.context = context; } /** * Initialize Spring's web application context for the given servlet context, * using the application context provided at construction time, or creating a new one * according to the "{@link #CONTEXT_CLASS_PARAM contextClass}" and * "{@link #CONFIG_LOCATION_PARAM contextConfigLocation}" context-params. * @param servletContext current servlet context * @return the new WebApplicationContext * @see #ContextLoader(WebApplicationContext) * @see #CONTEXT_CLASS_PARAM * @see #CONFIG_LOCATION_PARAM */ public WebApplicationContext initWebApplicationContext(ServletContext servletContext) { if (servletContext.getAttribute(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE) != null) { throw new IllegalStateException( "Cannot initialize context because there is already a root application context present - " + "check whether you have multiple ContextLoader* definitions in your web.xml!"); } Log logger = LogFactory.getLog(DhccContextLoader.class); servletContext.log("Initializing Spring root WebApplicationContext"); if (logger.isInfoEnabled()) { logger.info("Root WebApplicationContext: initialization started"); } long startTime = System.currentTimeMillis(); try { // Store context in local instance variable, to guarantee that // it is available on ServletContext shutdown. if (this.context == null) { this.context = createWebApplicationContext(servletContext); } if (this.context instanceof ConfigurableWebApplicationContext) { ConfigurableWebApplicationContext cwac = (ConfigurableWebApplicationContext) this.context; if (!cwac.isActive()) { // The context has not yet been refreshed -> provide services such as // setting the parent context, setting the application context id, etc if (cwac.getParent() == null) { // The context instance was injected without an explicit parent -> // determine parent for root web application context, if any. ApplicationContext parent = loadParentContext(servletContext); cwac.setParent(parent); } configureAndRefreshWebApplicationContext(cwac, servletContext); } } servletContext.setAttribute(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE, this.context); ClassLoader ccl = Thread.currentThread().getContextClassLoader(); if (ccl == DhccContextLoader.class.getClassLoader()) { currentContext = this.context; } else if (ccl != null) { currentContextPerThread.put(ccl, this.context); } if (logger.isDebugEnabled()) { logger.debug("Published root WebApplicationContext as ServletContext attribute with name [" + WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE + "]"); } if (logger.isInfoEnabled()) { long elapsedTime = System.currentTimeMillis() - startTime; logger.info("Root WebApplicationContext: initialization completed in " + elapsedTime + " ms"); } return this.context; } catch (RuntimeException ex) { logger.error("Context initialization failed", ex); servletContext.setAttribute(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE, ex); throw ex; } catch (Error err) { logger.error("Context initialization failed", err); servletContext.setAttribute(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE, err); throw err; } } /** * Instantiate the root WebApplicationContext for this loader, either the * default context class or a custom context class if specified. * <p>This implementation expects custom contexts to implement the * {@link ConfigurableWebApplicationContext} interface. * Can be overridden in subclasses. * <p>In addition, {@link #customizeContext} gets called prior to refreshing the * context, allowing subclasses to perform custom modifications to the context. * @param sc current servlet context * @return the root WebApplicationContext * @see ConfigurableWebApplicationContext */ protected WebApplicationContext createWebApplicationContext(ServletContext sc) { Class<?> contextClass = determineContextClass(sc); if (!ConfigurableWebApplicationContext.class.isAssignableFrom(contextClass)) { throw new ApplicationContextException("Custom context class [" + contextClass.getName() + "] is not of type [" + ConfigurableWebApplicationContext.class.getName() + "]"); } return (ConfigurableWebApplicationContext) BeanUtils.instantiateClass(contextClass); } /** * @deprecated as of Spring 3.1 in favor of * {@link #createWebApplicationContext(ServletContext)} and * {@link #configureAndRefreshWebApplicationContext(ConfigurableWebApplicationContext, ServletContext)} */ @Deprecated protected WebApplicationContext createWebApplicationContext(ServletContext sc, ApplicationContext parent) { return createWebApplicationContext(sc); } protected void configureAndRefreshWebApplicationContext(ConfigurableWebApplicationContext wac, ServletContext sc) { Log logger = LogFactory.getLog(DhccContextLoader.class); if (ObjectUtils.identityToString(wac).equals(wac.getId())) { // The application context id is still set to its original default value // -> assign a more useful id based on available information String idParam = sc.getInitParameter(CONTEXT_ID_PARAM); if (idParam != null) { wac.setId(idParam); } else { // Generate default id... if (sc.getMajorVersion() == 2 && sc.getMinorVersion() < 5) { // Servlet <= 2.4: resort to name specified in web.xml, if any. wac.setId(ConfigurableWebApplicationContext.APPLICATION_CONTEXT_ID_PREFIX + ObjectUtils.getDisplayString(sc.getServletContextName())); } else { wac.setId(ConfigurableWebApplicationContext.APPLICATION_CONTEXT_ID_PREFIX + ObjectUtils.getDisplayString(sc.getContextPath())); } } } wac.setServletContext(sc); String initParameter = sc.getInitParameter(CONFIG_LOCATION_PARAM); if (isMicrokernelStart(sc)) { initParameter = "classpath:codeTemplate/applicationSetupContext.xml"; logger.error("because cant't connect to db or setup flg is 0 so init application as Microkernel "); } else { logger.info("initParameter==" + initParameter); } if (initParameter != null) { wac.setConfigLocation(initParameter); } customizeContext(sc, wac); wac.refresh(); } private boolean isMicrokernelStart(ServletContext sc) { Log logger = LogFactory.getLog(DhccContextLoader.class); Properties prp = new Properties(); Connection connection = null; String setupFlg = null; String microKerne = null; try { prp.load(sc.getResourceAsStream("WEB-INF/classes/application.properties")); setupFlg = prp.getProperty("conf.auto.microKerne.disabled"); } catch (IOException e) { logger.error(e.getMessage(), e); } if ("true".equals(microKerne)) { prp = null; return false; } try { prp.load(sc.getResourceAsStream("WEB-INF/classes/hibernate.properties")); String url = prp.getProperty("jdbc.url"); String driver = prp.getProperty("jdbc.driver"); String username = prp.getProperty("jdbc.username"); String password = prp.getProperty("jdbc.password"); Class.forName(driver); connection = DriverManager.getConnection(url, username, password); setupFlg = "1"; } catch (IOException e) { logger.error(e.getMessage(), e); } catch (ClassNotFoundException e) { logger.error(e.getMessage(), e); } catch (SQLException e) { logger.error(e.getMessage(), e); } finally { if (connection != null) { try { connection.close(); } catch (SQLException e) { logger.error(e.getMessage(), e); } } } if ("1".equals(setupFlg)) { prp = null; return false; } prp = null; return true; } /** * Return the WebApplicationContext implementation class to use, either the * default XmlWebApplicationContext or a custom context class if specified. * @param servletContext current servlet context * @return the WebApplicationContext implementation class to use * @see #CONTEXT_CLASS_PARAM * @see org.springframework.web.context.support.XmlWebApplicationContext */ protected Class<?> determineContextClass(ServletContext servletContext) { String contextClassName = servletContext.getInitParameter(CONTEXT_CLASS_PARAM); if (contextClassName != null) { try { return ClassUtils.forName(contextClassName, ClassUtils.getDefaultClassLoader()); } catch (ClassNotFoundException ex) { throw new ApplicationContextException( "Failed to load custom context class [" + contextClassName + "]", ex); } } else { contextClassName = defaultStrategies.getProperty(WebApplicationContext.class.getName()); try { return ClassUtils.forName(contextClassName, DhccContextLoader.class.getClassLoader()); } catch (ClassNotFoundException ex) { throw new ApplicationContextException( "Failed to load default context class [" + contextClassName + "]", ex); } } } /** * Return the {@link ApplicationContextInitializer} implementation classes to use * if any have been specified by {@link #CONTEXT_INITIALIZER_CLASSES_PARAM}. * @param servletContext current servlet context * @see #CONTEXT_INITIALIZER_CLASSES_PARAM */ @SuppressWarnings("unchecked") protected List<Class<ApplicationContextInitializer<ConfigurableApplicationContext>>> determineContextInitializerClasses( ServletContext servletContext) { String classNames = servletContext.getInitParameter(CONTEXT_INITIALIZER_CLASSES_PARAM); List<Class<ApplicationContextInitializer<ConfigurableApplicationContext>>> classes = new ArrayList<Class<ApplicationContextInitializer<ConfigurableApplicationContext>>>(); if (classNames != null) { for (String className : StringUtils.tokenizeToStringArray(classNames, ",")) { try { Class<?> clazz = ClassUtils.forName(className, ClassUtils.getDefaultClassLoader()); Assert.isAssignable(ApplicationContextInitializer.class, clazz, "class [" + className + "] must implement ApplicationContextInitializer"); classes.add((Class<ApplicationContextInitializer<ConfigurableApplicationContext>>) clazz); } catch (ClassNotFoundException ex) { throw new ApplicationContextException( "Failed to load context initializer class [" + className + "]", ex); } } } return classes; } /** * Customize the {@link ConfigurableWebApplicationContext} created by this * ContextLoader after config locations have been supplied to the context * but before the context is <em>refreshed</em>. * <p>The default implementation {@linkplain #determineContextInitializerClasses(ServletContext) * determines} what (if any) context initializer classes have been specified through * {@linkplain #CONTEXT_INITIALIZER_CLASSES_PARAM context init parameters} and * {@linkplain ApplicationContextInitializer#initialize invokes each} with the * given web application context. * <p>Any {@code ApplicationContextInitializers} implementing * {@link org.springframework.core.Ordered Ordered} or marked with @{@link * org.springframework.core.annotation.Order Order} will be sorted appropriately. * @param servletContext the current servlet context * @param applicationContext the newly created application context * @see #createWebApplicationContext(ServletContext, ApplicationContext) * @see #CONTEXT_INITIALIZER_CLASSES_PARAM * @see ApplicationContextInitializer#initialize(ConfigurableApplicationContext) */ protected void customizeContext(ServletContext servletContext, ConfigurableWebApplicationContext applicationContext) { List<Class<ApplicationContextInitializer<ConfigurableApplicationContext>>> initializerClasses = determineContextInitializerClasses( servletContext); if (initializerClasses.size() == 0) { // no ApplicationContextInitializers have been declared -> nothing to do return; } Class<?> contextClass = applicationContext.getClass(); ArrayList<ApplicationContextInitializer<ConfigurableApplicationContext>> initializerInstances = new ArrayList<ApplicationContextInitializer<ConfigurableApplicationContext>>(); for (Class<ApplicationContextInitializer<ConfigurableApplicationContext>> initializerClass : initializerClasses) { Class<?> initializerContextClass = GenericTypeResolver.resolveTypeArgument(initializerClass, ApplicationContextInitializer.class); if (initializerContextClass != null) { Assert.isAssignable(initializerContextClass, contextClass, String.format( "Could not add context initializer [%s] as its generic parameter [%s] " + "is not assignable from the type of application context used by this " + "context loader [%s]: ", initializerClass.getName(), initializerContextClass.getName(), contextClass.getName())); } initializerInstances.add(BeanUtils.instantiateClass(initializerClass)); } ConfigurableEnvironment env = applicationContext.getEnvironment(); if (env instanceof ConfigurableWebEnvironment) { ((ConfigurableWebEnvironment) env).initPropertySources(servletContext, null); } Collections.sort(initializerInstances, new AnnotationAwareOrderComparator()); for (ApplicationContextInitializer<ConfigurableApplicationContext> initializer : initializerInstances) { initializer.initialize(applicationContext); } } /** * Template method with default implementation (which may be overridden by a * subclass), to load or obtain an ApplicationContext instance which will be * used as the parent context of the root WebApplicationContext. If the * return value from the method is null, no parent context is set. * <p>The main reason to load a parent context here is to allow multiple root * web application contexts to all be children of a shared EAR context, or * alternately to also share the same parent context that is visible to * EJBs. For pure web applications, there is usually no need to worry about * having a parent context to the root web application context. * <p>The default implementation uses * {@link org.springframework.context.access.ContextSingletonBeanFactoryLocator}, * configured via {@link #LOCATOR_FACTORY_SELECTOR_PARAM} and * {@link #LOCATOR_FACTORY_KEY_PARAM}, to load a parent context * which will be shared by all other users of ContextsingletonBeanFactoryLocator * which also use the same configuration parameters. * @param servletContext current servlet context * @return the parent application context, or {@code null} if none * @see org.springframework.context.access.ContextSingletonBeanFactoryLocator */ protected ApplicationContext loadParentContext(ServletContext servletContext) { ApplicationContext parentContext = null; String locatorFactorySelector = servletContext.getInitParameter(LOCATOR_FACTORY_SELECTOR_PARAM); String parentContextKey = servletContext.getInitParameter(LOCATOR_FACTORY_KEY_PARAM); if (parentContextKey != null) { // locatorFactorySelector may be null, indicating the default "classpath*:beanRefContext.xml" BeanFactoryLocator locator = ContextSingletonBeanFactoryLocator.getInstance(locatorFactorySelector); Log logger = LogFactory.getLog(DhccContextLoader.class); if (logger.isDebugEnabled()) { logger.debug("Getting parent context definition: using parent context key of '" + parentContextKey + "' with BeanFactoryLocator"); } this.parentContextRef = locator.useBeanFactory(parentContextKey); parentContext = (ApplicationContext) this.parentContextRef.getFactory(); } return parentContext; } /** * Close Spring's web application context for the given servlet context. If * the default {@link #loadParentContext(ServletContext)} implementation, * which uses ContextSingletonBeanFactoryLocator, has loaded any shared * parent context, release one reference to that shared parent context. * <p>If overriding {@link #loadParentContext(ServletContext)}, you may have * to override this method as well. * @param servletContext the ServletContext that the WebApplicationContext runs in */ public void closeWebApplicationContext(ServletContext servletContext) { servletContext.log("Closing Spring root WebApplicationContext"); try { if (this.context instanceof ConfigurableWebApplicationContext) { ((ConfigurableWebApplicationContext) this.context).close(); } } finally { ClassLoader ccl = Thread.currentThread().getContextClassLoader(); if (ccl == DhccContextLoader.class.getClassLoader()) { currentContext = null; } else if (ccl != null) { currentContextPerThread.remove(ccl); } servletContext.removeAttribute(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE); if (this.parentContextRef != null) { this.parentContextRef.release(); } } } /** * Obtain the Spring root web application context for the current thread * (i.e. for the current thread's context ClassLoader, which needs to be * the web application's ClassLoader). * @return the current root web application context, or {@code null} * if none found * @see org.springframework.web.context.support.SpringBeanAutowiringSupport */ public static WebApplicationContext getCurrentWebApplicationContext() { ClassLoader ccl = Thread.currentThread().getContextClassLoader(); if (ccl != null) { WebApplicationContext ccpt = currentContextPerThread.get(ccl); if (ccpt != null) { return ccpt; } } return currentContext; } }