13965803842

Committed 20 Mar 2025 09:16AM UTC coverage: 65.073% (-0.008%) from 65.081%

Build # 13965803842

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github

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web-flow

Commit Message

TRUNK-6309: Fix logging issue at Listener.java (#4967)

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/web/src/main/java/org/openmrs/web/Listener.java

/**
 * This Source Code Form is subject to the terms of the Mozilla Public License,
 * v. 2.0. If a copy of the MPL was not distributed with this file, You can
 * obtain one at http://mozilla.org/MPL/2.0/. OpenMRS is also distributed under
 * the terms of the Healthcare Disclaimer located at http://openmrs.org/license.
 *
 * Copyright (C) OpenMRS Inc. OpenMRS is a registered trademark and the OpenMRS
 * graphic logo is a trademark of OpenMRS Inc.
 */
package org.openmrs.web;

import org.apache.logging.log4j.Level;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.core.config.Configurator;
import org.openmrs.api.context.Context;
import org.openmrs.logging.OpenmrsLoggingUtil;
import org.openmrs.module.MandatoryModuleException;
import org.openmrs.module.Module;
import org.openmrs.module.ModuleFactory;
import org.openmrs.module.ModuleMustStartException;
import org.openmrs.module.OpenmrsCoreModuleException;
import org.openmrs.module.web.OpenmrsJspServlet;
import org.openmrs.module.web.WebModuleUtil;
import org.openmrs.scheduler.SchedulerUtil;
import org.openmrs.util.DatabaseUpdateException;
import org.openmrs.util.DatabaseUpdater;
import org.openmrs.util.InputRequiredException;
import org.openmrs.util.MemoryLeakUtil;
import org.openmrs.util.OpenmrsClassLoader;
import org.openmrs.util.OpenmrsConstants;
import org.openmrs.util.OpenmrsUtil;
import org.openmrs.web.filter.initialization.DatabaseDetective;
import org.openmrs.web.filter.initialization.InitializationFilter;
import org.openmrs.web.filter.update.UpdateFilter;
import org.owasp.csrfguard.CsrfGuard;
import org.owasp.csrfguard.CsrfGuardServletContextListener;
import org.slf4j.LoggerFactory;
import org.slf4j.MarkerFactory;
import org.springframework.beans.factory.BeanCreationException;
import org.springframework.util.StringUtils;
import org.springframework.web.context.ContextLoader;
import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.context.support.XmlWebApplicationContext;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.xml.sax.InputSource;

import javax.servlet.ServletContext;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import javax.servlet.ServletException;
import javax.servlet.http.HttpSessionEvent;
import javax.servlet.http.HttpSessionListener;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStreamWriter;
import java.io.StringReader;
import java.lang.reflect.Field;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.sql.Driver;
import java.sql.DriverManager;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Properties;

/**
 * Our Listener class performs the basic starting functions for our webapp. Basic needs for starting
 * the API: 1) Get the runtime properties 2) Start Spring 3) Start the OpenMRS APi (via
 * Context.startup) Basic startup needs specific to the web layer: 1) Do the web startup of the
 * modules 2) Copy the custom look/images/messages over into the web layer
 */
public final class Listener extends ContextLoader implements ServletContextListener, HttpSessionListener {
        
        private static final org.slf4j.Logger log = LoggerFactory.getLogger(Listener.class);
        
        private static boolean runtimePropertiesFound = false;
        
        private static Throwable errorAtStartup = null;
        
        private static boolean setupNeeded = false;
        
        private static boolean openmrsStarted = false;
        
        /**
         * Boolean flag set on webapp startup marking whether there is a runtime properties file or not.
         * If there is not, then the {@link InitializationFilter} takes over any openmrs url and
         * redirects to the {@link WebConstants#SETUP_PAGE_URL}
         *
         * @return true/false whether an openmrs runtime properties file is defined
         */
        public static boolean runtimePropertiesFound() {
                return runtimePropertiesFound;
        }
        
        /**
         * Boolean flag set by the {@link #contextInitialized(ServletContextEvent)} method if an error
         * occurred when trying to start up. The StartupErrorFilter displays the error to the admin
         *
         * @return true/false if an error occurred when starting up
         */
        public static boolean errorOccurredAtStartup() {
                return errorAtStartup != null;
        }
        
        /**
         * Boolean flag that tells if we need to run the database setup wizard.
         *
         * @return true if setup is needed, else false.
         */
        public static boolean isSetupNeeded() {
                return setupNeeded;
        }
        
        /**
         * Boolean flag that tells if OpenMRS is started and ready to handle requests via REST.
         *
         * @return true if started, else false.
         */
        public static boolean isOpenmrsStarted() {
                return openmrsStarted;
        }
        
        /**
         * Get the error thrown at startup
         *
         * @return get the error thrown at startup
         */
        public static Throwable getErrorAtStartup() {
                return errorAtStartup;
        }
        
        public static void setRuntimePropertiesFound(boolean runtimePropertiesFound) {
                Listener.runtimePropertiesFound = runtimePropertiesFound;
        }
        
        public static void setErrorAtStartup(Throwable errorAtStartup) {
                Listener.errorAtStartup = errorAtStartup;
        }

        /**
         * This gets all Spring components that implement HttpSessionListener 
         * and passes the HttpSession event to them whenever an HttpSession is created
         * @see HttpSessionListener#sessionCreated(HttpSessionEvent) 
         */
        @Override
        public void sessionCreated(HttpSessionEvent se) {
                for (HttpSessionListener listener : getHttpSessionListeners()) {
                        listener.sessionCreated(se);
                }
        }

        /**
         *         This gets all Spring components that implement HttpSessionListener 
         *         and passes the HttpSession event to them whenever an HttpSession is destroyed
         * @see HttpSessionListener#sessionDestroyed(HttpSessionEvent)
         */
        @Override
        public void sessionDestroyed(HttpSessionEvent se) {
                for (HttpSessionListener listener : getHttpSessionListeners()) {
                        listener.sessionDestroyed(se);
                }
        }

        /**
         *         This retrieves all Spring components that implement HttpSessionListener
         *         If an exception is thrown trying to retrieve these beans from the Context, a warning is logged
         * @see HttpSessionListener#sessionDestroyed(HttpSessionEvent)
         */
        private List<HttpSessionListener> getHttpSessionListeners() {
                List<HttpSessionListener> httpSessionListeners = Collections.emptyList();
                
                if (openmrsStarted) {
                        try {
                                httpSessionListeners = Context.getRegisteredComponents(HttpSessionListener.class);
                        }
                        catch (Exception e) {
                                log.warn("An error occurred trying to retrieve HttpSessionListener beans from the context", e);
                        }
                }
                
                return httpSessionListeners;
        }

        /**
         * This method is called when the servlet context is initialized(when the Web Application is
         * deployed). You can initialize servlet context related data here.
         *
         * @param event
         */
        @Override
        public void contextInitialized(ServletContextEvent event) {
                log.debug("Starting the OpenMRS webapp");
                
                try {
                        // validate the current JVM version
                        OpenmrsUtil.validateJavaVersion();
                        
                        ServletContext servletContext = event.getServletContext();
                        
                        // pulled from web.xml.
                        loadConstants(servletContext);
                        
                        // erase things in the dwr file
                        clearDWRFile(servletContext);
                        
                        setApplicationDataDirectory(servletContext);
                        
                        
                        // Try to get the runtime properties
                        Properties props = getRuntimeProperties();
                        if (props != null) {
                                // the user has defined a runtime properties file
                                setRuntimePropertiesFound(true);
                                // set props to the context so that they can be
                                // used during sessionFactory creation
                                Context.setRuntimeProperties(props);
                                
                                String appDataRuntimeProperty = props
                                        .getProperty(OpenmrsConstants.APPLICATION_DATA_DIRECTORY_RUNTIME_PROPERTY, null);
                                if (StringUtils.hasLength(appDataRuntimeProperty)) {
                                        OpenmrsUtil.setApplicationDataDirectory(null);
                                }
                                //ensure that we always log the runtime properties file that we are using
                                //since openmrs is just booting, the log levels are not yet set. TRUNK-4835
                                OpenmrsLoggingUtil.applyLogLevel(getClass().getName(), "INFO");
                                log.info("Using runtime properties file: {}",
                                         OpenmrsUtil.getRuntimePropertiesFilePathName(WebConstants.WEBAPP_NAME));
                        }

                        loadCsrfGuardProperties(servletContext);
                        
                        Thread.currentThread().setContextClassLoader(OpenmrsClassLoader.getInstance());
                        
                        if (!setupNeeded()) {
                                // must be done after the runtime properties are
                                // found but before the database update is done
                                copyCustomizationIntoWebapp(servletContext, props);
                                
                                /**
                                 * This logic is from ContextLoader.initWebApplicationContext. Copied here instead
                                 * of calling that so that the context is not cached and hence not garbage collected
                                 */
                                XmlWebApplicationContext context = (XmlWebApplicationContext) createWebApplicationContext(servletContext);
                                configureAndRefreshWebApplicationContext(context, servletContext);
                                servletContext.setAttribute(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE, context);
                                
                                WebDaemon.startOpenmrs(event.getServletContext());
                        } else {
                                setupNeeded = true;
                        }
                        
                }
                catch (Exception e) {
                        setErrorAtStartup(e);
                        log.error(MarkerFactory.getMarker("FATAL"), "Failed to obtain JDBC connection", e);
                }
        }

        private void loadCsrfGuardProperties(ServletContext servletContext) throws IOException {
                File csrfGuardFile = new File(OpenmrsUtil.getApplicationDataDirectory(), "csrfguard.properties");
                Properties csrfGuardProperties = new Properties();
                if (csrfGuardFile.exists()) {
                        try (InputStream csrfGuardInputStream = Files.newInputStream(csrfGuardFile.toPath())) {
                                csrfGuardProperties.load(csrfGuardInputStream);
                        }
                        catch (Exception e) {
                                log.error("Error loading csrfguard.properties file at " + csrfGuardFile.getAbsolutePath(), e);
                                throw e;
                        }
                }
                else {
                        String fileName = servletContext.getRealPath("/WEB-INF/csrfguard.properties");
                        try (InputStream csrfGuardInputStream = Files.newInputStream(Paths.get(fileName))) {
                                csrfGuardProperties.load(csrfGuardInputStream);
                        }
                        catch (Exception e) {
                                log.error("Error loading csrfguard.properties file at " +  fileName, e);
                                throw e;
                        }
                }
                
                Properties runtimeProperties = getRuntimeProperties();
                if (runtimeProperties != null) {
                        runtimeProperties.stringPropertyNames().forEach(property -> {
                                if (property.startsWith("org.owasp.csrfguard")) {
                                        csrfGuardProperties.setProperty(property, runtimeProperties.getProperty(property));
                                }
                        });        
                }
                
                CsrfGuard.load(csrfGuardProperties);
                
                try {
                        //CSRFGuard by default loads properties using CsrfGuardServletContextListener
                        //which sets the servlet context path to be used during variable substitution of
                        //%servletContext% in the properties file.
                        Field field = CsrfGuardServletContextListener.class.getDeclaredField("servletContext");
                        field.setAccessible(true);
                        field.set(null, servletContext.getContextPath());
                }
                catch (Exception ex) {
                        log.error("Failed to set the CSRFGuard servlet context", ex);
                }
        }
        
        /**
         * This method knows about all the filters that openmrs uses for setup. Currently those are the
         * {@link InitializationFilter} and the {@link UpdateFilter}. If either of these have to do
         * something, openmrs won't start in this Listener.
         *
         * @return true if one of the filters needs to take some action
         */
        private boolean setupNeeded() throws Exception {
                if (!runtimePropertiesFound) {
                        return true;
                }
                
                DatabaseDetective databaseDetective = new DatabaseDetective();
                if (databaseDetective.isDatabaseEmpty(OpenmrsUtil.getRuntimeProperties(WebConstants.WEBAPP_NAME))) {
                        return true;
                }
                
                return DatabaseUpdater.updatesRequired() && !DatabaseUpdater.allowAutoUpdate();
        }
        
        /**
         * Do the work of starting openmrs.
         *
         * @param servletContext
         * @throws ServletException
         */
        public static void startOpenmrs(ServletContext servletContext) throws ServletException {
                openmrsStarted = false;
                // start openmrs
                try {
                        // load bundled modules that are packaged into the webapp
                        Listener.loadBundledModules(servletContext);
                        
                        Context.startup(getRuntimeProperties());
                }
                catch (DatabaseUpdateException | InputRequiredException updateEx) {
                        throw new ServletException("Should not be here because updates were run previously", updateEx);
                }
                catch (MandatoryModuleException mandatoryModEx) {
                        throw new ServletException(mandatoryModEx);
                }
                catch (OpenmrsCoreModuleException coreModEx) {
                        // don't wrap this error in a ServletException because we want to deal with it differently
                        // in the StartupErrorFilter class
                        throw coreModEx;
                }
                
                // TODO catch openmrs errors here and drop the user back out to the setup screen
                
                try {
                        
                        // web load modules
                        Listener.performWebStartOfModules(servletContext);
                        
                        // start the scheduled tasks
                        SchedulerUtil.startup(getRuntimeProperties());
                }
                catch (Exception t) {
                        Context.shutdown();
                        WebModuleUtil.shutdownModules(servletContext);
                        throw new ServletException(t);
                }
                finally {
                        Context.closeSession();
                }
                openmrsStarted = true;
        }
        
        /**
         * Load the openmrs constants with values from web.xml init parameters
         *
         * @param servletContext startup context (web.xml)
         */
        private void loadConstants(ServletContext servletContext) {
                WebConstants.BUILD_TIMESTAMP = servletContext.getInitParameter("build.timestamp");
                WebConstants.WEBAPP_NAME = getContextPath(servletContext);
                WebConstants.MODULE_REPOSITORY_URL = servletContext.getInitParameter("module.repository.url");
                
                if (!"openmrs".equalsIgnoreCase(WebConstants.WEBAPP_NAME)) {
                        OpenmrsConstants.KEY_OPENMRS_APPLICATION_DATA_DIRECTORY = WebConstants.WEBAPP_NAME
                                + "_APPLICATION_DATA_DIRECTORY";
                }
        }
        
        private void setApplicationDataDirectory(ServletContext servletContext) {
                // note: the below value will be overridden after reading the runtime properties if the
                // "application_data_directory" runtime property is set
                String appDataDir = servletContext.getInitParameter("application.data.directory");
                if (StringUtils.hasLength(appDataDir)) {
                        OpenmrsUtil.setApplicationDataDirectory(appDataDir);
                } else if (!"openmrs".equalsIgnoreCase(WebConstants.WEBAPP_NAME)) {
                        OpenmrsUtil.setApplicationDataDirectory(
                            Paths.get(OpenmrsUtil.getApplicationDataDirectory(), WebConstants.WEBAPP_NAME).toString());
                }
        }
        
        /**
         * @return current contextPath of this webapp without initial slash
         */
        private String getContextPath(ServletContext servletContext) {
                // Get the context path without the request.
                String contextPath = servletContext.getContextPath();
                
                // trim off initial slash if it exists
                if (contextPath.startsWith("/")) {
                        contextPath = contextPath.substring(1);
                }
                
                return contextPath;
        }
        
        /**
         * Convenience method to empty out the dwr-modules.xml file to fix any errors that might have
         * occurred in it when loading or unloading modules.
         *
         * @param servletContext
         */
        private void clearDWRFile(ServletContext servletContext) {
                File dwrFile = Paths.get(servletContext.getRealPath(""), "WEB-INF", "dwr-modules.xml").toFile();
                
                try {
                        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
                        DocumentBuilder db = dbf.newDocumentBuilder();
                        // When asked to resolve external entities (such as a DTD) we return an InputSource
                        // with no data at the end, causing the parser to ignore the DTD.
                        db.setEntityResolver((publicId, systemId) -> new InputSource(new StringReader("")));
                        Document doc = db.parse(dwrFile);
                        Element elem = doc.getDocumentElement();
                        elem.setTextContent("");
                        OpenmrsUtil.saveDocument(doc, dwrFile);
                }
                catch (Exception e) {
                        // got here because the dwr-modules.xml file is empty for some reason.  This might
                        // happen because the servlet container (i.e. tomcat) crashes when first loading this file
                        log.debug("Error clearing dwr-modules.xml", e);
                        dwrFile.delete();
                        OutputStreamWriter writer = null;
                        try {
                                writer = new OutputStreamWriter(new FileOutputStream(dwrFile), StandardCharsets.UTF_8);
                                writer.write(
                                    "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<!DOCTYPE dwr PUBLIC \"-//GetAhead Limited//DTD Direct Web Remoting 2.0//EN\" \"http://directwebremoting.org/schema/dwr20.dtd\">\n<dwr></dwr>");
                        }
                        catch (IOException io) {
                                log.error(
                                    "Unable to clear out the " + dwrFile.getAbsolutePath() + " file.  Please redeploy the openmrs war file",
                                    io);
                        }
                        finally {
                                if (writer != null) {
                                        try {
                                                writer.close();
                                        }
                                        catch (IOException io) {
                                                log.warn("Couldn't close Writer: " + io);
                                        }
                                }
                        }
                }
        }
        
        /**
         * Copy the customization scripts over into the webapp
         *
         * @param servletContext
         */
        private void copyCustomizationIntoWebapp(ServletContext servletContext, Properties props) {
                String realPath = servletContext.getRealPath("");
                // TODO centralize map to WebConstants?
                Map<String, String> custom = new HashMap<>();
                custom.put("custom.template.dir", "/WEB-INF/template");
                custom.put("custom.index.jsp.file", "/WEB-INF/view/index.jsp");
                custom.put("custom.login.jsp.file", "/WEB-INF/view/login.jsp");
                custom.put("custom.patientDashboardForm.jsp.file", "/WEB-INF/view/patientDashboardForm.jsp");
                custom.put("custom.images.dir", "/images");
                custom.put("custom.style.css.file", "/style.css");
                custom.put("custom.messages", "/WEB-INF/custom_messages.properties");
                custom.put("custom.messages_fr", "/WEB-INF/custom_messages_fr.properties");
                custom.put("custom.messages_es", "/WEB-INF/custom_messages_es.properties");
                custom.put("custom.messages_de", "/WEB-INF/custom_messages_de.properties");
                
                for (Map.Entry<String, String> entry : custom.entrySet()) {
                        String prop = entry.getKey();
                        String webappPath = entry.getValue();
                        String userOverridePath = props.getProperty(prop);
                        // if they defined the variable
                        if (userOverridePath != null) {
                                String absolutePath = realPath + webappPath;
                                File file = new File(userOverridePath);
                                
                                // if they got the path correct
                                // also, if file does not start with a "." (hidden files, like SVN files)
                                if (file.exists() && !userOverridePath.startsWith(".")) {
                                        log.debug("Overriding file: " + absolutePath);
                                        log.debug("Overriding file with: " + userOverridePath);
                                        if (file.isDirectory()) {
                                                File[] files = file.listFiles();
                                                if (files != null) {
                                                        for (File f : files) {
                                                                userOverridePath = f.getAbsolutePath();
                                                                if (!f.getName().startsWith(".")) {
                                                                        String tmpAbsolutePath = absolutePath + "/" + f.getName();
                                                                        if (!copyFile(userOverridePath, tmpAbsolutePath)) {
                                                                                log.warn("Unable to copy file in folder defined by runtime property: " + prop);
                                                                                log.warn("Your source directory (or a file in it) '" + userOverridePath
                                                                                                        + " cannot be loaded or destination '" + tmpAbsolutePath + "' cannot be found");
                                                                        }
                                                                }
                                                        }
                                                }
                                        } else {
                                                // file is not a directory
                                                if (!copyFile(userOverridePath, absolutePath)) {
                                                        log.warn("Unable to copy file defined by runtime property: " + prop);
                                                        log.warn("Your source file '" + userOverridePath + " cannot be loaded or destination '"
                                                                + absolutePath + "' cannot be found");
                                                }
                                        }
                                }
                        }
                        
                }
        }
        
        /**
         * Copies file pointed to by <code>fromPath</code> to <code>toPath</code>
         *
         * @param fromPath
         * @param toPath
         * @return true/false whether the copy was a success
         */
        private boolean copyFile(String fromPath, String toPath) {
                FileInputStream inputStream = null;
                FileOutputStream outputStream = null;
                try {
                        inputStream = new FileInputStream(fromPath);
                        outputStream = new FileOutputStream(toPath);
                        OpenmrsUtil.copyFile(inputStream, outputStream);
                }
                catch (IOException io) {
                        return false;
                }
                finally {
                        try {
                                if (inputStream != null) {
                                        inputStream.close();
                                }
                        }
                        catch (IOException io) {
                                log.warn("Unable to close input stream", io);
                        }
                        try {
                                if (outputStream != null) {
                                        outputStream.close();
                                }
                        }
                        catch (IOException io) {
                                log.warn("Unable to close input stream", io);
                        }
                }
                return true;
        }
        
        /**
         * Load the pre-packaged modules from web/WEB-INF/bundledModules. <br>
         * <br>
         * This method assumes that the api startup() and WebModuleUtil.startup() will be called later
         * for modules that loaded here
         *
         * @param servletContext the current servlet context for the webapp
         */
        public static void loadBundledModules(ServletContext servletContext) {
                File folder = Paths.get(servletContext.getRealPath(""), "WEB-INF", "bundledModules").toFile();
                
                if (!folder.exists()) {
                        log.warn("Bundled module folder doesn't exist: " + folder.getAbsolutePath());
                        return;
                }
                if (!folder.isDirectory()) {
                        log.warn("Bundled module folder isn't really a directory: " + folder.getAbsolutePath());
                        return;
                }
                
                // loop over the modules and load the modules that we can
                File[] files = folder.listFiles();
                if (files != null) {
                        for (File f : files) {
                                if (!f.getName().startsWith(".")) { // ignore .svn folder and the like
                                        try {
                                                Module mod = ModuleFactory.loadModule(f);
                                                log.debug("Loaded bundled module: " + mod + " successfully");
                                        }
                                        catch (Exception e) {
                                                log.warn("Error while trying to load bundled module " + f.getName() + "", e);
                                        }
                                }
                        }
                }
        }
        
        /**
         * Called when the webapp is shut down properly Must call Context.shutdown() and then shutdown
         * all the web layers of the modules
         *
         * @see org.springframework.web.context.ContextLoaderListener#contextDestroyed(javax.servlet.ServletContextEvent)
         */
        @SuppressWarnings("squid:S1215")
        @Override
        public void contextDestroyed(ServletContextEvent event) {
                
                try {
                        openmrsStarted = false;
                        Context.openSession();
                        
                        Context.shutdown();
                        
                        WebModuleUtil.shutdownModules(event.getServletContext());
                        
                }
                catch (Exception e) {
                        // don't print the unhelpful "contextDAO is null" message
                        if (!"contextDAO is null".equals(e.getMessage())) {
                                // not using log.error here so it can be garbage collected
                                System.out.println("Listener.contextDestroyed: Error while shutting down openmrs: ");
                                log.error("Listener.contextDestroyed: Error while shutting down openmrs: ", e);
                        }
                }
                finally {
                        if ("true".equalsIgnoreCase(System.getProperty("FUNCTIONAL_TEST_MODE"))) {
                                //Delete the temporary file created for functional testing and shutdown the mysql daemon
                                String filename = WebConstants.WEBAPP_NAME + "-test-runtime.properties";
                                File file = new File(OpenmrsUtil.getApplicationDataDirectory(), filename);
                                System.out.println(filename + " delete=" + file.delete());
                                
                        }
                        // remove the user context that we set earlier
                        Context.closeSession();
                }
                try {
                        for (Enumeration<Driver> e = DriverManager.getDrivers(); e.hasMoreElements();) {
                                Driver driver = e.nextElement();
                                ClassLoader classLoader = driver.getClass().getClassLoader();
                                // only unload drivers for this webapp
                                if (classLoader == null || classLoader == getClass().getClassLoader()) {
                                        DriverManager.deregisterDriver(driver);
                                } else {
                                        System.err.println("Didn't remove driver class: " + driver.getClass() + " with classloader of: "
                                                + driver.getClass().getClassLoader());
                                }
                        }
                }
                catch (Exception e) {
                        System.err.println("Listener.contextDestroyed: Failed to cleanup drivers in webapp");
                        log.error("Listener.contextDestroyed: Failed to cleanup drivers in webapp", e);
                }
                
                MemoryLeakUtil.shutdownMysqlCancellationTimer();
                
                OpenmrsClassLoader.onShutdown();
                
                LogManager.shutdown();
                
                // just to make things nice and clean.
                // Suppressing sonar issue squid:S1215
                System.gc();
                System.gc();
        }
        
        /**
         * Finds and loads the runtime properties
         *
         * @return Properties
         * @see OpenmrsUtil#getRuntimeProperties(String)
         */
        public static Properties getRuntimeProperties() {
                return OpenmrsUtil.getRuntimeProperties(WebConstants.WEBAPP_NAME);
        }
        
        /**
         * Call WebModuleUtil.startModule on each started module
         *
         * @param servletContext
         * @throws ModuleMustStartException if the context cannot restart due to a
         *             {@link MandatoryModuleException} or {@link OpenmrsCoreModuleException}
         */
        public static void performWebStartOfModules(ServletContext servletContext) throws ModuleMustStartException, Exception {
                List<Module> startedModules = new ArrayList<>(ModuleFactory.getStartedModules());
                performWebStartOfModules(startedModules, servletContext);
        }
        
        public static void performWebStartOfModules(Collection<Module> startedModules, ServletContext servletContext)
                throws ModuleMustStartException, Exception {
                
                boolean someModuleNeedsARefresh = false;
                for (Module mod : startedModules) {
                        try {
                                boolean thisModuleCausesRefresh = WebModuleUtil.startModule(mod, servletContext,
                                    /* delayContextRefresh */true);
                                someModuleNeedsARefresh = someModuleNeedsARefresh || thisModuleCausesRefresh;
                        }
                        catch (Exception e) {
                                mod.setStartupErrorMessage("Unable to start module", e);
                        }
                }
                
                if (someModuleNeedsARefresh) {
                        try {
                                WebModuleUtil.refreshWAC(servletContext, true, null);
                        }
                        catch (ModuleMustStartException | BeanCreationException ex) {
                                // pass this up to the calling method so that openmrs loading stops
                                throw ex;
                        }
                        catch (Exception e) {
                                Throwable rootCause = getActualRootCause(e, true);
                                if (rootCause != null) {
                                        log.error(MarkerFactory.getMarker("FATAL"),
                                            "Unable to refresh the spring application context.  Root Cause was:", rootCause);
                                } else {
                                        log.error(MarkerFactory.getMarker("FATAL"),
                                            "nable to refresh the spring application context. Unloading all modules,  Error was:", e);
                                }
                                
                                try {
                                        WebModuleUtil.shutdownModules(servletContext);
                                        for (Module mod : ModuleFactory.getLoadedModules()) {// use loadedModules to avoid a concurrentmodificationexception
                                                if (!mod.isCoreModule() && !mod.isMandatory()) {
                                                        try {
                                                                ModuleFactory.stopModule(mod, true, true);
                                                        }
                                                        catch (Exception t3) {
                                                                // just keep going if we get an error shutting down.  was probably caused by the module
                                                                // that actually got us to this point!
                                                                log.trace("Unable to shutdown module:" + mod, t3);
                                                        }
                                                }
                                        }
                                        WebModuleUtil.refreshWAC(servletContext, true, null);
                                }
                                catch (MandatoryModuleException ex) {
                                        // pass this up to the calling method so that openmrs loading stops
                                        throw new MandatoryModuleException(ex.getModuleId(), "Got an error while starting a mandatory module: "
                                                + e.getMessage() + ". Check the server logs for more information");
                                }
                                catch (Exception t2) {
                                        // a mandatory or core module is causing spring to fail to start up.  We don't want those
                                        // stopped so we must report this error to the higher authorities
                                        log.warn("caught another error: ", t2);
                                        throw t2;
                                }
                        }
                }
                
                // because we delayed the refresh, we need to load+start all servlets and filters now
                // (this is to protect servlets/filters that depend on their module's spring xml config being available)
                for (Module mod : ModuleFactory.getStartedModulesInOrder()) {
                        WebModuleUtil.loadServlets(mod, servletContext);
                        WebModuleUtil.loadFilters(mod, servletContext);
                }
                servletContext.setAttribute(OpenmrsJspServlet.OPENMRS_TLD_SCAN_NEEDED, true);
        }
        
        /**
         * Convenience method that recursively attempts to pull the root case from a Throwable
         *
         * @param t the Throwable object
         * @param isOriginalError specifies if the passed in Throwable is the original Exception that
         *            was thrown
         * @return the root cause if any was found
         */
        private static Throwable getActualRootCause(Throwable t, boolean isOriginalError) {
                if (t.getCause() != null) {
                        return getActualRootCause(t.getCause(), false);
                }
                
                if (!isOriginalError) {
                        return t;
                }
                
                return null;
        }
        
}

openmrs / openmrs-core / 13965803842

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