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EE4J Compatible Implementation for Jakarta Faces API
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/*
* Copyright (c) 1997, 2020 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package com.sun.faces.context;
import java.io.IOException;
import java.util.Collections;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.logging.Level;
import java.util.logging.Logger;
import com.sun.faces.RIConstants;
import com.sun.faces.util.FacesLogger;
import jakarta.faces.FacesException;
import jakarta.faces.application.ProjectStage;
import jakarta.faces.component.UIComponent;
import jakarta.faces.context.ExceptionHandler;
import jakarta.faces.context.ExceptionHandlerWrapper;
import jakarta.faces.context.ExternalContext;
import jakarta.faces.context.FacesContext;
import jakarta.faces.context.PartialResponseWriter;
import jakarta.faces.event.AbortProcessingException;
import jakarta.faces.event.ExceptionQueuedEvent;
import jakarta.faces.event.ExceptionQueuedEventContext;
import jakarta.faces.event.PhaseId;
import jakarta.faces.event.SystemEvent;
/**
*
* A specialized implementation of {@link ExceptionHandler} for Faces that handles exceptions by writing error
* information to the partial response.
*
*
*/
public class AjaxExceptionHandlerImpl extends ExceptionHandlerWrapper {
private static final Logger LOGGER = FacesLogger.CONTEXT.getLogger();
private static final String LOG_BEFORE_KEY = "faces.context.exception.handler.log_before";
private static final String LOG_AFTER_KEY = "faces.context.exception.handler.log_after";
private static final String LOG_KEY = "faces.context.exception.handler.log";
private LinkedList unhandledExceptions;
private LinkedList handledExceptions;
private ExceptionQueuedEvent handled;
public AjaxExceptionHandlerImpl(ExceptionHandler handler) {
super(handler);
}
/**
* @see ExceptionHandler#getHandledExceptionQueuedEvent()
*/
@Override
public ExceptionQueuedEvent getHandledExceptionQueuedEvent() {
return handled;
}
/**
* @see jakarta.faces.context.ExceptionHandlerWrapper#handle()
*/
@Override
public void handle() throws FacesException {
for (Iterator i = getUnhandledExceptionQueuedEvents().iterator(); i.hasNext();) {
ExceptionQueuedEvent event = i.next();
ExceptionQueuedEventContext context = (ExceptionQueuedEventContext) event.getSource();
try {
Throwable t = context.getException();
if (isRethrown(t)) {
handled = event;
Throwable unwrapped = getRootCause(t);
if (unwrapped != null) {
handlePartialResponseError(context.getContext(), unwrapped);
} else {
if (t instanceof FacesException) {
handlePartialResponseError(context.getContext(), t);
} else {
handlePartialResponseError(context.getContext(), new FacesException(t.getMessage(), t));
}
}
} else {
log(context);
}
} finally {
if (handledExceptions == null) {
handledExceptions = new LinkedList<>();
}
handledExceptions.add(event);
i.remove();
}
}
}
/**
* @see jakarta.faces.context.ExceptionHandlerWrapper#processEvent(jakarta.faces.event.SystemEvent)
*/
@Override
public void processEvent(SystemEvent event) throws AbortProcessingException {
if (event != null) {
if (unhandledExceptions == null) {
unhandledExceptions = new LinkedList<>();
}
unhandledExceptions.add((ExceptionQueuedEvent) event);
}
}
/**
* @see jakarta.faces.context.ExceptionHandlerWrapper#getUnhandledExceptionQueuedEvents()
*/
@Override
public Iterable getUnhandledExceptionQueuedEvents() {
return unhandledExceptions != null ? unhandledExceptions : Collections.emptyList();
}
/**
* @see jakarta.faces.context.ExceptionHandlerWrapper#getHandledExceptionQueuedEvents()
*/
@Override
public Iterable getHandledExceptionQueuedEvents() {
return handledExceptions != null ? handledExceptions : Collections.emptyList();
}
// --------------------------------------------------------- Private Methods
private void handlePartialResponseError(FacesContext context, Throwable t) {
if (context.getResponseComplete()) {
return; // don't write anything if the response is complete
}
try {
ExternalContext extContext = context.getExternalContext();
extContext.setResponseContentType(RIConstants.TEXT_XML_CONTENT_TYPE);
extContext.addResponseHeader("Cache-Control", "no-cache");
PartialResponseWriter writer = context.getPartialViewContext().getPartialResponseWriter();
writer.startDocument();
writer.startError(t.getClass().toString());
String msg;
if (context.isProjectStage(ProjectStage.Production)) {
msg = "See your server log for more information";
} else {
if (t.getCause() != null) {
msg = t.getCause().getMessage();
} else {
msg = t.getMessage();
}
}
writer.write(msg != null ? msg : "");
writer.endError();
writer.endDocument();
if (LOGGER.isLoggable(Level.SEVERE)) {
LOGGER.log(Level.SEVERE, t.toString(), t);
}
context.responseComplete();
} catch (IOException ioe) {
if (LOGGER.isLoggable(Level.SEVERE)) {
LOGGER.log(Level.SEVERE, ioe.toString(), ioe);
}
}
}
private boolean isRethrown(Throwable t) {
return !(t instanceof AbortProcessingException);
}
private void log(ExceptionQueuedEventContext exceptionContext) {
UIComponent c = exceptionContext.getComponent();
boolean beforePhase = exceptionContext.inBeforePhase();
boolean afterPhase = exceptionContext.inAfterPhase();
PhaseId phaseId = exceptionContext.getPhaseId();
Throwable t = exceptionContext.getException();
String key = getLoggingKey(beforePhase, afterPhase);
if (LOGGER.isLoggable(Level.SEVERE)) {
LOGGER.log(Level.SEVERE, key, new Object[] { t.getClass().getName(), phaseId.toString(),
c != null ? c.getClientId(exceptionContext.getContext()) : "", t.getMessage() });
LOGGER.log(Level.SEVERE, t.getMessage(), t);
}
}
private String getLoggingKey(boolean beforePhase, boolean afterPhase) {
if (beforePhase) {
return LOG_BEFORE_KEY;
} else if (afterPhase) {
return LOG_AFTER_KEY;
} else {
return LOG_KEY;
}
}
}