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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.jasper.servlet;
import java.io.IOException;
import java.util.Set;
import javax.servlet.ServletContainerInitializer;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.jsp.JspFactory;
import org.apache.jasper.Constants;
import org.apache.jasper.compiler.Localizer;
import org.apache.jasper.compiler.TldCache;
import org.apache.jasper.runtime.JspFactoryImpl;
import org.apache.jasper.security.SecurityClassLoad;
import org.apache.juli.logging.Log;
import org.apache.juli.logging.LogFactory;
import org.apache.tomcat.InstanceManager;
import org.apache.tomcat.SimpleInstanceManager;
import org.xml.sax.SAXException;
/**
* Initializer for the Jasper JSP Engine.
*/
public class JasperInitializer implements ServletContainerInitializer {
private static final String MSG = "org.apache.jasper.servlet.JasperInitializer";
private final Log log = LogFactory.getLog(JasperInitializer.class); // must not be static
/*
* Preload classes required at runtime by a JSP servlet so that we don't get a defineClassInPackage security
* exception.
*/
static {
JspFactoryImpl factory = new JspFactoryImpl();
SecurityClassLoad.securityClassLoad(factory.getClass().getClassLoader());
if (JspFactory.getDefaultFactory() == null) {
JspFactory.setDefaultFactory(factory);
}
}
@Override
public void onStartup(Set<Class<?>> types, ServletContext context) throws ServletException {
if (log.isDebugEnabled()) {
log.debug(Localizer.getMessage(MSG + ".onStartup", context.getServletContextName()));
}
// Set up a simple default Instance Manager
if (context.getAttribute(InstanceManager.class.getName()) == null) {
context.setAttribute(InstanceManager.class.getName(), new SimpleInstanceManager());
}
boolean validate = Boolean.parseBoolean(context.getInitParameter(Constants.XML_VALIDATION_TLD_INIT_PARAM));
String blockExternalString = context.getInitParameter(Constants.XML_BLOCK_EXTERNAL_INIT_PARAM);
boolean blockExternal;
if (blockExternalString == null) {
blockExternal = true;
} else {
blockExternal = Boolean.parseBoolean(blockExternalString);
}
// scan the application for TLDs
TldScanner scanner = newTldScanner(context, true, validate, blockExternal);
try {
scanner.scan();
} catch (IOException | SAXException e) {
throw new ServletException(e);
}
// add any listeners defined in TLDs
for (String listener : scanner.getListeners()) {
context.addListener(listener);
}
context.setAttribute(TldCache.SERVLET_CONTEXT_ATTRIBUTE_NAME,
new TldCache(context, scanner.getUriTldResourcePathMap(), scanner.getTldResourcePathTaglibXmlMap()));
}
protected TldScanner newTldScanner(ServletContext context, boolean namespaceAware, boolean validate,
boolean blockExternal) {
return new TldScanner(context, namespaceAware, validate, blockExternal);
}
}
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