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From Chen Yang <cy...@hrsg.ca>
Subject Java Servlet error with tomcat running on Windows Server 2008 R2
Date Thu, 16 Jul 2015 18:01:56 GMT
Hi all,

I'm maintaining a Java servlet which uses for render PDF files. Recently I've been tasked
to deploy it to run on windows environment.

It works perfectly in our old Linux environment; but I'm having issues in windows with the
same setup, I can however get a pdf report when there is no image included, but no luck when
there are images included.

I just want to mention I have checked firewall, file permissions and networking on the windows
sandbox machine.

I've been asking around for helps, but without any luck so far. If anyone in the mailing list
can shed some light on it, It would be much appreciated!

Cheers,

Chen


Environment setup:
*         JRE 1.8.0_45
*         Tomcat 8.0.23
*         Windows Server 2008 R2

Error Message from Tomcat:

HTTP Status 500 - javax.xml.transform.TransformerException: org.xml.sax.SAXException: The
resource path [http://testing.mycompany.com/app/client_data/logo.png]<http://testing.mycompany.com/app/client_data/logo.png%5d>
is not valid

type Exception report

message javax.xml.transform.TransformerException: org.xml.sax.SAXException: The resource path
[http://testing.mycompany.com/app/client_data/logo.png]<http://testing.mycompany.com/app/client_data/logo.png%5d>
is not valid

description The server encountered an internal error that prevented it from fulfilling this
request.

Servlet Code

package org.apache.fop.servlet;

import java.net.*;
import java.io.*;

import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.URI;
import java.net.URL;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.xml.transform.Result;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.URIResolver;
import javax.xml.transform.sax.SAXResult;
import javax.xml.transform.stream.StreamSource;

import org.apache.commons.io.output.ByteArrayOutputStream;

import org.apache.xmlgraphics.io.Resource;
import org.apache.xmlgraphics.io.ResourceResolver;

import org.apache.fop.apps.FOPException;
import org.apache.fop.apps.FOUserAgent;
import org.apache.fop.apps.Fop;
import org.apache.fop.apps.FopFactory;
import org.apache.fop.apps.FopFactoryBuilder;
import org.apache.fop.apps.FopConfParser;
import org.apache.fop.apps.MimeConstants;

import java.util.Calendar;
import java.text.SimpleDateFormat;

import org.apache.avalon.framework.configuration.Configuration;
import org.apache.avalon.framework.configuration.DefaultConfigurationBuilder;

import org.apache.avalon.framework.configuration.Configuration;
import org.apache.avalon.framework.configuration.ConfigurationException;
import org.apache.avalon.framework.configuration.DefaultConfiguration;

import org.xml.sax.SAXException;

public class FopServlet extends HttpServlet {

    /** Name of the parameter used for the XSL-FO file */
    protected static final String FO_REQUEST_PARAM = "fo";
    /** Name of the parameter used for the XML file */
    protected static final String XML_REQUEST_PARAM = "xml";
    /** Name of the parameter used for the XSLT file */
    protected static final String XSLT_REQUEST_PARAM = "xslt";
    /** Name of the parameter used for the ROOT URL */
    protected static final String ROOT_REQUEST_PARAM = "root_url";

    /** The TransformerFactory used to create Transformer instances */
    protected TransformerFactory transFactory = null;
    /** The FopFactory used to create Fop instances */
    protected FopFactory fopFactory = null;
    /** URIResolver for use by this servlet */
    protected URIResolver uriResolver;

    public void init() throws ServletException {
        this.uriResolver = new ServletContextURIResolver(getServletContext());
        this.transFactory = TransformerFactory.newInstance();
        this.transFactory.setURIResolver(this.uriResolver);
        //Configure FopFactory as desired
        ResourceResolver resolver = new ResourceResolver() {
            public OutputStream getOutputStream(URI uri) throws IOException {
                URL url = getServletContext().getResource(uri.toASCIIString());
                return url.openConnection().getOutputStream();
            }

            public Resource getResource(URI uri) throws IOException {
                return new Resource(getServletContext().getResourceAsStream(uri.toASCIIString()));
            }
        };
        FopFactoryBuilder builder = new FopFactoryBuilder(new File(".").toURI(), resolver);
        //configureFopFactory(builder);

        try {
            String confFile = "C:\Program Files\tomcat\webapps\pdf_servlet\WEB-INF\iss-fop.xconf";
            builder = new FopConfParser(new File(confFile)).getFopFactoryBuilder();
        }catch(SAXException e) {
            System.out.println(e);
        }catch(IOException e) {
            System.out.println(e);
        }
        fopFactory = builder.build();
    }

    public void doGet(HttpServletRequest request,
                      HttpServletResponse response) throws ServletException {
        try {
            //Get parameters
            String foParam = request.getParameter(FO_REQUEST_PARAM);
            String xmlParam = request.getParameter(XML_REQUEST_PARAM);
            String xsltParam = request.getParameter(XSLT_REQUEST_PARAM);
            String RootParam = request.getParameter(ROOT_REQUEST_PARAM);

            //Analyze parameters and decide with method to use
            if (foParam != null) {
                renderFO(foParam, response);
            } else if ((xmlParam != null) && (xsltParam != null)) {
                renderXML(xmlParam,xsltParam,RootParam,response);
            } else {
                response.setContentType("text/html");
                PrintWriter out = response.getWriter();
                out.println("<html><head><title>Error</title></head>\n"
                          + "<body><h1>FopServlet Error</h1><h3>No
'fo' "
                          + "request param given.</body></html>");
            }
        } catch (Exception ex) {
            throw new ServletException(ex);
        }
    }

    public static String now(String dateFormat) {
        Calendar cal = Calendar.getInstance();
        SimpleDateFormat sdf = new SimpleDateFormat(dateFormat);
        return sdf.format(cal.getTime());
    }

    /**
     * Converts a String parameter to a JAXP Source object.
     * @param param a String parameter
     * @return Source the generated Source object
     */
    protected Source convertString2Source(String param) {
        Source src;
        try {
            src = uriResolver.resolve(param, null);
        } catch (TransformerException e) {
            src = null;
        }
        if (src == null) {
            src = new StreamSource(new File(param));
        }
        return src;
    }

    private void sendPDF(byte[] content, HttpServletResponse response) throws IOException
{
        //Send the result back to the client
        response.setContentType("application/pdf");
        File pdfFileName = new File(now("MM/dd/yyyy"));
        response.addHeader("content-disposition","inline;filename=" + pdfFileName + ".pdf");
        response.setContentLength(content.length);
        //response.setContentLength(out.size());
        response.getOutputStream().write(content);
        response.getOutputStream().flush();
    }

    protected void renderFO(String fo, HttpServletResponse response)
                throws FOPException, TransformerException, IOException {

        //Setup source
        Source foSrc = convertString2Source(fo);

        //Setup the identity transformation
        Transformer transformer = this.transFactory.newTransformer();
        transformer.setURIResolver(this.uriResolver);

        //Start transformation and rendering process
        render(foSrc, transformer, response);
    }


    protected void renderXML(String xml, String xslt,String rootUrl,HttpServletResponse response)
                throws FOPException, TransformerException, IOException {

        //Setup sources
        StreamSource xmlSrc = new StreamSource(new URL(rootUrl + "/output/xml/" + xml).openStream());
        StreamSource xsltSrc = new StreamSource(new URL(rootUrl + "/output/xslt/" + xslt).openStream());

        //Setup the XSL transformation
        Transformer transformer = this.transFactory.newTransformer(xsltSrc);
        transformer.setURIResolver(this.uriResolver);

        //Start transformation and rendering process
        render(xmlSrc, transformer, response);
    }


    protected void render(Source src, Transformer transformer, HttpServletResponse response)
                throws FOPException, TransformerException, IOException {

        FOUserAgent foUserAgent = getFOUserAgent();

        //Setup output
        ByteArrayOutputStream out = new ByteArrayOutputStream();

        //Setup FOP
        Fop fop = fopFactory.newFop(MimeConstants.MIME_PDF, foUserAgent, out);

        //Make sure the XSL transformation's result is piped through to FOP
        Result res = new SAXResult(fop.getDefaultHandler());

        //Start the transformation and rendering process
        transformer.transform(src, res);

        //Return the result
        sendPDF(out.toByteArray(), response);
    }

    /** @return a new FOUserAgent for FOP */
    protected FOUserAgent getFOUserAgent() {
        FOUserAgent userAgent = fopFactory.newFOUserAgent();
        //Configure foUserAgent as desired
        return userAgent;
    }

}

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