Problem in the package or classpath

Question

Hello every body
I want to add a module at "jhove" which is open source: http://hul.harvard.edu/jhove/index.html
When I launch jhove like this: ./jhove -k file.pdf, it shows me more informations about this pdf.
I want that it re-knows me anathor type of file.(warc format)
Then I have to write a new module.
I try to do it following the link: http://hul.harvard.edu/jhove/writingamodule.html
I added my java code in :/home/jhove/classes/edu/harvard/hul/ois/jhove/module/Project/
The compilation works well.
I add : EXTRA_JARS=/jhove/classes/edu/harvard/hul/ois/jhove/module/Project/WarcModule.jar
At the file: jhove.tmpl
I also add this code at jhove.conf like they montionned in document:
<module>
<class>WarcModule</class>
</module>
I also try with this solution:
<module>
<class>edu.harvard.hul.ois.jhove.module.Project.MonModule</class>
</module>
But I have this error:
edu.harvard.hul.ois.jhove.JhoveException: cannot instantiate module: WarcModule
at edu.harvard.hul.ois.jhove.JhoveBase.init(Unknown Source)
at Jhove.main(Unknown Source)
I think that is problem in the classpath.
There is my code:
package edu.harvard.hul.ois.jhove.module.Project;
import java.io.File; 
import java.util.*;
import java.io.*;
import edu.harvard.hul.ois.jhove.*;
import edu.harvard.hul.ois.jhove.ModuleBase;
import edu.harvard.hul.ois.jhove.RepInfo;
import org.archive.io.warc.*;
public class MonModule extends ModuleBase
         private static final String NAME = "Warc-hul";
         private static final String RELEASE = "1.7";
         private static final int [] DATE = {2008, 9, 23};
         private static final String [] FORMAT = { "warc"};
         private static final String COVERAGE =
             "PDF 1.0-1.6; PDF/X-1 (ISO 15930-1:2001), X-1a (ISO 15930-4:2003), " +
          "X-2 (ISO 15930-5:2003), and X-3 (ISO 15930-6:2003); Tagged PDF; " +
          "Linearized PDF; PDF/A (ISO/CD 19005-1)";
         private static final String [] MIMETYPE = {"application/warc"};
         private static final String WELLFORMED = "A PDF file is " +
             "well-formed if it meets the criteria defined in Chapter " +
             "3 of the PDF Reference 1.6 (5th edition, 2004)";
         private static final String VALIDITY = null;
         private static final String REPINFO = null;
         private static final String NOTE = "This module does *not* validate " +
          "data within content streams (including operators) or encrypted data";
         private static final String RIGHTS = "Copyright 2003-2007 by JSTOR and " +
          "the President and Fellows of Harvard College. " +
          "Released under the GNU Lesser General Public License.";
         private static final String ENCRYPTED = "<May be encrypted>";
protected MonModule(String NAME, String RELEASE, int[] DATE, String[] FORMAT, String COVERAGE, String[] MIMETYPE, String WELLFORMED, String VALIDITY, String REPINFO, String NOTE, String RIGHTS, boolean x)
         super  (NAME, RELEASE, DATE, FORMAT, COVERAGE, MIMETYPE, WELLFORMED,VALIDITY, REPINFO, NOTE, RIGHTS, true);
* PRIVATE INSTANCE FIELDS.
/* First 6 bytes of file */
protected byte _sig[];
/* Checksummer object */
protected Checksummer _ckSummer;
/* XMP property */
protected Property _xmpProp;
/* Input stream wrapper which handles checksums */
protected ChecksumInputStream _cstream;
/* Data input stream wrapped around _cstream */
protected DataInputStream _dstream;
/* Flag for presence of global color table */
protected boolean _globalColorTableFlag;
/* Size of global color table */
protected int _globalColorTableSize;
/* Count of graphic control extensions preceding
* something to modify */
protected int _gceCounter;
/* Top-level metadata property */
protected Property _metadata;
/* Blocks list property */
protected List _blocksList;
/* Total count of graphic and plain text extension blocks */
protected int _numGraphicBlocks;
public void checkSignatures (File file,  InputStream stream, RepInfo info)
throws IOException
int sigBytes[] = { 'W', 'A', 'R', 'C'};
int i;
int ch;
try {
    _dstream = null;
    _dstream = getBufferedDataStream (stream, _je != null ?
                _je.getBufferSize () : 0);
    for (i = 0; i < 4; i++) {
        ch = readUnsignedByte(_dstream, this);
        if (ch != sigBytes) {
info.setWellFormed (false);
return;
info.setModule (this);
info.setFormat (_format[0]);
info.setMimeType (_mimeType[0]);
info.setSigMatch(_name);
catch (Exception e) {
// Reading a very short file may take us here.
info.setWellFormed (false);
return;
Please can any one help me.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               

Answer 1

Daniel, not sure if everything is clear now, but the way you are validating a WARC file is seriously flawed! I strongly suggest you use an existing WARC tool to do the actual parsing/validating.
I've seen more and more people on JHove's mailing list posting problems on how to create their own modules, so I decided to write a small how-to-write-your-own-module-guide.
Perhaps you'd like to give it a shot. I'll also post it on the mailing list.
================================================================================
This is a step-by-step tutorial that will enable you to compile and run a
custom made module for Harvard's idetification tool JHove [1]. This is not
a tutorial on Java programming! For a thorough explanation of this tool and
extensive documentation, please see:
[http://hul.harvard.edu/jhove/documentation.html]
================================================================================
= Setp 1 =
Download and unzip JHove 1.1f [2]. The unzipped folder will be called
JHOVE_HOME from now on.
================================================================================
= Step 2 =
In this example I will construct a very elementary ARC module and will be using
Heritrix' [3] ARCUtils class, so download Heritrix 1.14 [4] and unzip it. After
unzipping, locate the file 'heritrix-1.14.1.jar' (it might be a different
version) and place it in the directory 'JHOVE_HOME/bin'.
================================================================================
= Step 3 =
Create a folder 'JHOVE_HOME/bin/test' and create a new file in it called
'ArcModule.java'. Paste the following contents in that file:
package test;
import java.io.IOException;
import java.io.InputStream;
import edu.harvard.hul.ois.jhove.ModuleBase;
import edu.harvard.hul.ois.jhove.RepInfo;
import org.archive.io.arc.ARCUtils;
public class ArcModule extends ModuleBase {
    private static final String NAME = "ARC-hul";
    private static final String RELEASE = "0.1";
    private static final int[] DATE = {2008, 11, 11};
    private static final String[] FORMAT = {"ARC"};
    private static final String COVERAGE = null;
    private static final String[] MIMETYPE = {"application/arc"};
    private static final String WELLFORMED = "...";
    private static final String VALIDITY = null;
    private static final String REPINFO = "...";
    private static final String NOTE = null;
    private static final String RIGHTS = "GNU LGPL";
    public ArcModule() {
        super (NAME, RELEASE, DATE, FORMAT, COVERAGE, MIMETYPE, WELLFORMED,
                VALIDITY, REPINFO, NOTE, RIGHTS, false);
        // Optionally set some Agent information: see the other Modules how
        // this can be done.
    @Override
    public int parse(InputStream stream, RepInfo info, int parseIndex) {
        info.setModule(this);
        boolean wellFormed = false;
        try {
            if(ARCUtils.testCompressedARCStream(stream)) {
                wellFormed = true;
        } catch (IOException e) {
            e.printStackTrace();
        info.setWellFormed(wellFormed);
        return 0;
}================================================================================
= Step 4 =
Compile this ArcModule by opening a shell (command prompt) and cd-ing to
'JHOVE_HOME/bin' and executing the following command:
*nix & Mac OS:
javac -cp .:JhoveApp.jar:heritrix-1.14.1.jar test/ArcModule.javaWindows:
javac -cp .;JhoveApp.jar;heritrix-1.14.1.jar test\ArcModule.java
(Note, if you're using JDK 1.4, replace '-cp' with '-classpath')
You shouldn't get any messages if all goes well.
================================================================================
= Step 5 =
Open the file 'JHOVE_HOME/conf/jhove.conf' and add the following right beneath
the line <bufferSize>?????</bufferSize>, where ????? is a number:
<module>
  <class>test.ArcModule</class>
</module>Save the file.
================================================================================
= Step 6 =
Create a folder called 'JHOVE_HOME/arcs' and copy two compressed ARC files in
them. If you don't have any compressed ARC files laying around, you can
download two small [5]. The file 'A.arc.gz' is a valid compressed ARC file,
while 'B.arc.gz' is the same as 'A.arc.gz' but I removed the ARC-header from
the latter, making it an invalid ARC file.
================================================================================
= Step 7 =
Open a shell, cd to 'JHOVE_HOME/bin' and execute the following command:
*nix & Mac OS:
java -cp .:JhoveApp.jar:heritrix-1.14.1.jar Jhove -c ../conf/jhove.conf -m ARC-hul ../arcsWindows:
java -cp .;JhoveApp.jar;heritrix-1.14.1.jar Jhove -c ..\conf\jhove.conf -m ARC-hul ..\arcsWhich will cause JHove to scan everything that is in 'JHOVE_HOME/arcs' folder
and throws it through your newly create ArcModule. The output will be as
follows:
Jhove (Rel. 1.1, 2008-02-21)
Date: 2008-11-14 22:29:51 CET
RepresentationInformation: .../jhove/arcs/A.arc.gz
  ReportingModule: ARC-hul, Rel. 0.1 (2008-11-11)
  LastModified: 2008-08-24 20:23:20 CEST
  Size: 130870
  Status: Well-Formed and valid
RepresentationInformation: .../jhove/arcs/B.arc.gz
  ReportingModule: ARC-hul, Rel. 0.1 (2008-11-11)
  LastModified: 2008-11-14 21:53:15 CET
  Size: 116136
  Status: Not well-formedWhich is the expected result: A is valid and B is not.
================================================================================
= Final remarks =
As I said, this is not a programming tutorial, nor is it the best way to
validate ARC files: more meta data should be extracted from the file. But I
leave that for you. This was only a guide to show you how to get started on
writing and running your own modules. You can have a look at the source
of the existing modules to see the "best practices" w.r.t. writing a module.
Best of luck!
Regards,
Bart.
================================================================================
= References =
[1] [http://hul.harvard.edu]
[2] [http://hul.harvard.edu/jhove/download.html]
[3] [http://crawler.archive.org]
[4] [http://sourceforge.net/project/showfiles.php?group_id=73833&package_id=73980]
[5] [http://iruimte.nl/arcs]