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A-Jetty Base can run on Android Java as well as on standard Java 7+ and it can run precompiled JSP/JSTL.
//
// ========================================================================
// Copyright (c) 1995-2016 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
//
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
//
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
//
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
//
package org.eclipse.jetty.servlet;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import org.eclipse.jetty.server.Dispatcher;
import org.eclipse.jetty.server.handler.ContextHandler;
import org.eclipse.jetty.server.handler.ErrorHandler;
/* ------------------------------------------------------------ */
/** Error Page Error Handler
*
* An ErrorHandler that maps exceptions and status codes to URIs for dispatch using
* the internal ERROR style of dispatch.
*
*/
public class ErrorPageErrorHandler extends ErrorHandler implements ErrorHandler.ErrorPageMapper
{
public final static String GLOBAL_ERROR_PAGE = "org.eclipse.jetty.server.error_page.global";
protected ServletContext _servletContext;
private final Map _errorPages= new HashMap(); // code or exception to URL
private final List _errorPageList=new ArrayList(); // list of ErrorCode by range
/* ------------------------------------------------------------ */
public ErrorPageErrorHandler()
{}
/* ------------------------------------------------------------ */
@Override
public String getErrorPage(HttpServletRequest request)
{
String error_page= null;
Throwable th= (Throwable)request.getAttribute(Dispatcher.ERROR_EXCEPTION);
// Walk the cause hierarchy
while (error_page == null && th != null )
{
Class exClass=th.getClass();
error_page= (String)_errorPages.get(exClass.getName());
// walk the inheritance hierarchy
while (error_page == null)
{
exClass= exClass.getSuperclass();
if (exClass==null)
break;
error_page= (String)_errorPages.get(exClass.getName());
}
th=(th instanceof ServletException)?((ServletException)th).getRootCause():null;
}
if (error_page == null)
{
// look for an exact code match
Integer code=(Integer)request.getAttribute(Dispatcher.ERROR_STATUS_CODE);
if (code!=null)
{
error_page= (String)_errorPages.get(Integer.toString(code));
// if still not found
if ((error_page == null) && (_errorPageList != null))
{
// look for an error code range match.
for (int i = 0; i < _errorPageList.size(); i++)
{
ErrorCodeRange errCode = (ErrorCodeRange) _errorPageList.get(i);
if (errCode.isInRange(code))
{
error_page = errCode.getUri();
break;
}
}
}
}
}
//try servlet 3.x global error page
if (error_page == null)
error_page = _errorPages.get(GLOBAL_ERROR_PAGE);
return error_page;
}
/* ------------------------------------------------------------ */
/**
* @return Returns the errorPages.
*/
public Map getErrorPages()
{
return _errorPages;
}
/* ------------------------------------------------------------ */
/**
* @param errorPages The errorPages to set. A map of Exception class name or error code as a string to URI string
*/
public void setErrorPages(Map errorPages)
{
_errorPages.clear();
if (errorPages!=null)
_errorPages.putAll(errorPages);
}
/* ------------------------------------------------------------ */
/** Add Error Page mapping for an exception class
* This method is called as a result of an exception-type element in a web.xml file
* or may be called directly
* @param exception The exception
* @param uri The URI of the error page.
*/
public void addErrorPage(Class exception,String uri)
{
_errorPages.put(exception.getName(),uri);
}
/* ------------------------------------------------------------ */
/** Add Error Page mapping for an exception class
* This method is called as a result of an exception-type element in a web.xml file
* or may be called directly
* @param exceptionClassName The exception
* @param uri The URI of the error page.
*/
public void addErrorPage(String exceptionClassName,String uri)
{
_errorPages.put(exceptionClassName,uri);
}
/* ------------------------------------------------------------ */
/** Add Error Page mapping for a status code.
* This method is called as a result of an error-code element in a web.xml file
* or may be called directly
* @param code The HTTP status code to match
* @param uri The URI of the error page.
*/
public void addErrorPage(int code,String uri)
{
_errorPages.put(Integer.toString(code),uri);
}
/* ------------------------------------------------------------ */
/** Add Error Page mapping for a status code range.
* This method is not available from web.xml and must be called
* directly.
* @param from The lowest matching status code
* @param to The highest matching status code
* @param uri The URI of the error page.
*/
public void addErrorPage(int from, int to, String uri)
{
_errorPageList.add(new ErrorCodeRange(from, to, uri));
}
/* ------------------------------------------------------------ */
@Override
protected void doStart() throws Exception
{
super.doStart();
_servletContext=ContextHandler.getCurrentContext();
}
/* ------------------------------------------------------------ */
/* ------------------------------------------------------------ */
private class ErrorCodeRange
{
private int _from;
private int _to;
private String _uri;
ErrorCodeRange(int from, int to, String uri)
throws IllegalArgumentException
{
if (from > to)
throw new IllegalArgumentException("from>to");
_from = from;
_to = to;
_uri = uri;
}
boolean isInRange(int value)
{
if ((value >= _from) && (value <= _to))
{
return true;
}
return false;
}
String getUri()
{
return _uri;
}
@Override
public String toString()
{
return "from: " + _from + ",to: " + _to + ",uri: " + _uri;
}
}
}