javax.faces.webapp.FacesServlet Maven / Gradle / Ivy
/*
* $Id: FacesServlet.java,v 1.38 2008/01/25 16:36:32 edburns Exp $
*/
/*
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package javax.faces.webapp;
import java.io.IOException;
import java.util.ResourceBundle;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.faces.FacesException;
import javax.faces.FactoryFinder;
import javax.faces.application.ResourceHandler;
import javax.faces.context.FacesContext;
import javax.faces.context.FacesContextFactory;
import javax.faces.lifecycle.Lifecycle;
import javax.faces.lifecycle.LifecycleFactory;
import javax.servlet.Servlet;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.UnavailableException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* FacesServlet is a
* servlet that manages the request processing lifecycle for web
* applications that are utilizing JavaServer Faces to construct the
* user interface.
*/
public final class FacesServlet implements Servlet {
/**
* Context initialization parameter name for a comma delimited list
* of context-relative resource paths (in addition to
* /WEB-INF/faces-config.xml which is loaded automatically
* if it exists) containing JavaServer Faces configuration information.
*/
public static final String CONFIG_FILES_ATTR =
"javax.faces.CONFIG_FILES";
/**
* Context initialization parameter name for the lifecycle identifier
* of the {@link Lifecycle} instance to be utilized.
*/
public static final String LIFECYCLE_ID_ATTR =
"javax.faces.LIFECYCLE_ID";
/**
* The Logger for this class.
*/
private static final Logger LOGGER =
Logger.getLogger("javax.faces.webapp", "javax.faces.LogStrings");
/**
* Factory for {@link FacesContext} instances.
*/
private FacesContextFactory facesContextFactory = null;
/**
* The {@link Lifecycle} instance to use for request processing.
*/
private Lifecycle lifecycle = null;
/**
* The ServletConfig instance for this servlet.
*/
private ServletConfig servletConfig = null;
/**
* Release all resources acquired at startup time.
*/
public void destroy() {
facesContextFactory = null;
lifecycle = null;
servletConfig = null;
}
/**
* Return the ServletConfig instance for this servlet.
*/
public ServletConfig getServletConfig() {
return (this.servletConfig);
}
/**
* Return information about this Servlet.
*/
public String getServletInfo() {
return (this.getClass().getName());
}
/**
* Acquire the factory instances we will require.
*
* @throws ServletException if, for any reason, the startup of
* this Faces application failed. This includes errors in the
* config file that is parsed before or during the processing of
* this init() method.
*/
public void init(ServletConfig servletConfig) throws ServletException {
// Save our ServletConfig instance
this.servletConfig = servletConfig;
// Acquire our FacesContextFactory instance
try {
facesContextFactory = (FacesContextFactory)
FactoryFinder.getFactory
(FactoryFinder.FACES_CONTEXT_FACTORY);
} catch (FacesException e) {
ResourceBundle rb = LOGGER.getResourceBundle();
String msg = rb.getString("severe.webapp.facesservlet.init_failed");
Throwable rootCause = (e.getCause() != null) ? e.getCause() : e;
LOGGER.log(Level.SEVERE, msg, rootCause);
throw new UnavailableException(msg);
}
// Acquire our Lifecycle instance
try {
LifecycleFactory lifecycleFactory = (LifecycleFactory)
FactoryFinder.getFactory(FactoryFinder.LIFECYCLE_FACTORY);
String lifecycleId ;
// First look in the servlet init-param set
if (null == (lifecycleId = servletConfig.getInitParameter(LIFECYCLE_ID_ATTR))) {
// If not found, look in the context-param set
lifecycleId = servletConfig.getServletContext().getInitParameter
(LIFECYCLE_ID_ATTR);
}
if (lifecycleId == null) {
lifecycleId = LifecycleFactory.DEFAULT_LIFECYCLE;
}
lifecycle = lifecycleFactory.getLifecycle(lifecycleId);
} catch (FacesException e) {
Throwable rootCause = e.getCause();
if (rootCause == null) {
throw e;
} else {
throw new ServletException(e.getMessage(), rootCause);
}
}
}
/**
* Process an incoming request, and create the
* corresponding response according to the following
* specification.
*
*
*
* If the request and response
* arguments to this method are not instances of
* HttpServletRequest and
* HttpServletResponse, respectively, the results of
* invoking this method are undefined.
*
* This method must respond to requests that start with the
* following strings by invoking the sendError method
* on the response argument (cast to
* HttpServletResponse), passing the code
* HttpServletResponse.SC_NOT_FOUND as the
* argument.
*
*
*
/WEB-INF/
/WEB-INF
/META-INF/
/META-INF
*
*
*
* If none of the cases described above in the specification for
* this method apply to the servicing of this request, the following
* action must be taken to service the request.
* Acquire a {@link FacesContext} instance for this request.
* Acquire the ResourceHandler for this request by
* calling {@link
* javax.faces.application.Application#getResourceHandler}. Call
* {@link
* javax.faces.application.ResourceHandler#isResourceRequest}. If
* this returns true call {@link
* javax.faces.application.ResourceHandler#handleResourceRequest}.
* If this returns false, call {@link
* javax.faces.lifecycle.Lifecycle#execute} followed by {@link
* javax.faces.lifecycle.Lifecycle#render}. If a {@link
* javax.faces.FacesException} is thrown in either case, extract the
* cause from the FacesException. If the cause is
* null extract the message from the
* FacesException, put it inside of a new
* ServletException instance, and pass the
* FacesException instance as the root cause, then
* rethrow the ServletException instance. If the cause
* is an instance of ServletException, rethrow the
* cause. If the cause is an instance of IOException,
* rethrow the cause. Otherwise, create a new
* ServletException instance, passing the message from
* the cause, as the first argument, and the cause itself as the
* second argument.
* In a finally block, {@link
* javax.faces.context.FacesContext#release} must be called.
*
*
* @param request The servlet request we are processing
* @param response The servlet response we are creating
*
* @throws IOException if an input/output error occurs during processing
* @throws ServletException if a servlet error occurs during processing
*/
public void service(ServletRequest request,
ServletResponse response)
throws IOException, ServletException {
requestStart(((HttpServletRequest) request).getRequestURI()); // V3 Probe hook
// If prefix mapped, then ensure requests for /WEB-INF are
// not processed.
String pathInfo = ((HttpServletRequest) request).getPathInfo();
if (pathInfo != null) {
pathInfo = pathInfo.toUpperCase();
if (pathInfo.startsWith("/WEB-INF/")
|| pathInfo.equals("/WEB-INF")
|| pathInfo.startsWith("/META-INF/")
|| pathInfo.equals("/META-INF")) {
((HttpServletResponse) response).
sendError(HttpServletResponse.SC_NOT_FOUND);
return;
}
}
// Acquire the FacesContext instance for this request
FacesContext context = facesContextFactory.getFacesContext
(servletConfig.getServletContext(), request, response, lifecycle);
// Execute the request processing lifecycle for this request
try {
ResourceHandler handler =
context.getApplication().getResourceHandler();
if (handler.isResourceRequest(context)) {
handler.handleResourceRequest(context);
} else {
lifecycle.execute(context);
lifecycle.render(context);
}
} catch (FacesException e) {
Throwable t = e.getCause();
if (t == null) {
throw new ServletException(e.getMessage(), e);
} else {
if (t instanceof ServletException) {
throw ((ServletException) t);
} else if (t instanceof IOException) {
throw ((IOException) t);
} else {
throw new ServletException(t.getMessage(), t);
}
}
}
finally {
// Release the FacesContext instance for this request
context.release();
}
requestEnd(); // V3 Probe hook
}
// --------------------------------------------------------- Private Methods
/**
* DO NOT REMOVE. Necessary for V3 probe monitoring.
*/
@SuppressWarnings({"UnusedDeclaration"})
private void requestStart(String requestUri) { }
/**
* DO NOT REMOVE. Necessary for V3 probe monitoring.
*/
private void requestEnd() { }
}