import org.apache.jasper.runtime.InstanceManagerFactory; //导入依赖的package包/类
public void destroy() {
    if (theServlet != null) {
        theServlet.destroy();
        InstanceManager instanceManager = InstanceManagerFactory.getInstanceManager(config);
        try {
            instanceManager.destroyInstance(theServlet);
        } catch (Exception e) {
            // Log any exception, since it can't be passed along
            log.error(Localizer.getMessage("jsp.error.file.not.found",
                    e.getMessage()), e);
        }
    }
}
 

import org.apache.jasper.runtime.InstanceManagerFactory; //导入依赖的package包/类
void addJspSupport(BeyondJWebAppContext webApp, File scratchDir, Server server) {

        System.setProperty("org.apache.jasper.compiler.disablejsr199", "false");
        webApp.setAttribute(JSP_TEMP_DIR, scratchDir);
        webApp.setAttribute(
                "org.eclipse.jetty.server.webapp.ContainerIncludeJarPattern",
                ".*/[^/]*servlet-api-[^/]*\\.jar$|.*/javax.servlet.jsp.jstl-.*\\.jar$|.*/[^/]*taglibs.*\\.jar$");

        webApp.setAttribute(JETTY_CONTAINER_INITIALIZERS, jspInitializers());
        webApp.setAttribute(InstanceManagerFactory.class.getName(), new SimpleInstanceManager());
        webApp.addBean(new ServletContainerInitializersStarter(webApp), Boolean.TRUE);
        webApp.addServlet(jspServletHolder(), "*.jsp");
        addDefaultServlet(webApp);
    }
 

import org.apache.jasper.runtime.InstanceManagerFactory; //导入依赖的package包/类
public Servlet getServlet() throws ServletException {
    // DCL on 'reload' requires that 'reload' be volatile
    // (this also forces a read memory barrier, ensuring the
    // new servlet object is read consistently)
    if (reload) {
        synchronized (this) {
            // Synchronizing on jsw enables simultaneous loading
            // of different pages, but not the same page.
            if (reload) {
                // This is to maintain the original protocol.
                destroy();

                final Servlet servlet;

                try {
                    InstanceManager instanceManager = InstanceManagerFactory.getInstanceManager(config);
                    servlet = (Servlet) instanceManager.newInstance(ctxt.getFQCN(), ctxt.getJspLoader());
                } catch (Exception e) {
                    Throwable t = ExceptionUtils
                            .unwrapInvocationTargetException(e);
                    ExceptionUtils.handleThrowable(t);
                    throw new JasperException(t);
                }

                servlet.init(config);

                if (!firstTime) {
                    ctxt.getRuntimeContext().incrementJspReloadCount();
                }

                theServlet = servlet;
                reload = false;
                // Volatile 'reload' forces in order write of 'theServlet' and new servlet object
            }
        }
    }
    return theServlet;
}
 

import org.apache.jasper.runtime.InstanceManagerFactory; //导入依赖的package包/类
public void destroy() {
    if (theServlet != null) {
        theServlet.destroy();
        InstanceManager instanceManager = InstanceManagerFactory.getInstanceManager(config);
        try {
            instanceManager.destroyInstance(theServlet);
        } catch (Exception e) {
            Throwable t = ExceptionUtils.unwrapInvocationTargetException(e);
            ExceptionUtils.handleThrowable(t);
            // Log any exception, since it can't be passed along
            log.error(Localizer.getMessage("jsp.error.file.not.found",
                    e.getMessage()), t);
        }
    }
}
 

import org.apache.jasper.runtime.InstanceManagerFactory; //导入依赖的package包/类
public Servlet getServlet() throws ServletException {
    // DCL on 'reload' requires that 'reload' be volatile
    // (this also forces a read memory barrier, ensuring the 
    // new servlet object is read consistently)
    if (reload) {
        synchronized (this) {
            // Synchronizing on jsw enables simultaneous loading
            // of different pages, but not the same page.
            if (reload) {
                // This is to maintain the original protocol.
                destroy();
                
                final Servlet servlet;

                try {
                    InstanceManager instanceManager = InstanceManagerFactory.getInstanceManager(config);
                    servlet = (Servlet) instanceManager.newInstance(ctxt.getFQCN(), ctxt.getJspLoader());
                } catch (Exception e) {
                    Throwable t = ExceptionUtils
                            .unwrapInvocationTargetException(e);
                    ExceptionUtils.handleThrowable(t);
                    throw new JasperException(t);
                }
                
                servlet.init(config);

                if (!firstTime) {
                    ctxt.getRuntimeContext().incrementJspReloadCount();
                }

                theServlet = servlet;
                reload = false;
                // Volatile 'reload' forces in order write of 'theServlet' and new servlet object
            }
        }    
    }
    return theServlet;
}