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<!doctype linuxdoc system>
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<!--
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************************** begin comment *****************************
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The following is the HOW-TO for setting up Java Decompiler.
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This document is in the SGML format. You must use sgml package to
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process this document
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************************* end of comment *****************************
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-->
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<!--
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************************** SGML USER GUIDE *****************************
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The SGML user guide on linux is located at /usr/doc/sgml-tools
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Read the example.sgml and guide.html documents.
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Usage:
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HTML sgml2html foo (Do not give extension .sgml here!!)
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Text sgml2txt foo.sgml
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Latex sgml2latex foo.sgml
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Note: Use 2 dashes - before language, error while compiling
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Postscript sgml2latex -language=english -o ps foo.sgml
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DVI sgml2latex -d foo.sgml
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Lyx sgml2lyx foo.sgml
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Richtext sgml2rtf foo.sgml
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gnuinfo sgml2info foo.sgml
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man sgml2txt -man foo.sgml
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SGML sgmlcheck foo.sgml
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************************* end of comment *****************************
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-->
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<article>
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<!-- Title information -->
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<title> Java Decompiler HOW-TO
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<!-- chapt change
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Java Decompiler HOW-TO
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-->
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<author>Al Dev (Alavoor Vasudevan)
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<htmlurl url="mailto:alavoor@yahoo.com"
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name="alavoor@yahoo.com">
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<date>v1.0, 12 July 2000
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<abstract>
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This document will help you to de-compile the Java class programs. This
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documents gives a list of decompilers which can reverse
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engineer the Java class files and generate the Java source code files.
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Thie is very helpful if you do not have the Java source code file and have only
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the Java class files. The information in this document applies to all
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the operating sytems where Java language/Java VM runs.
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</abstract>
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<!-- Table of contents -->
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<toc>
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<!-- Begin the document -->
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<!--
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*******************************************
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************ End of Section ***************
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*******************************************
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<chapt>Introduction
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-->
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<sect>Introduction
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<p>
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Java compiler compiles the Java source code files (*.java) into
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binaries files (*.class). You would use the Java de-compiler to
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convert java class files into source code files (*.java).
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Java de-compiler is very useful especially if you have *.class
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files and you do not have access to the source code. Some vendors
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do not ship the source code for java class files, in which case
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you use the java decompiler to look at the source code.
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See also the "javap" command from Sun Microsystems. This command is
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available as soon as you install the JDK from Sun Microsystems.
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At unix prompt type -
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<code>
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bash$ javap -help
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bash$ javap -c <filename>.class
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</code>
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The following are the list of Java decompilers available -
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<itemize>
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<item> "SourceAgain" from Ahpah corp at <url url="http://www.ahpah.com">
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<item> "Class Cracker" from Mayon Software, Australia at <url url="http://www.tip.net.au/~mayon/classcracker/ccorder.html"> and at <url url="http://www.pcug.org.au/~mayon">
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<item> "DeCafe Pro" from DeCafe, France at <url url="http://decafe.hypermart.net/index.htm">
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<item> "IceBreaker" from BreakerTech corp, U.K. at <url url="http://www.breakertech.com">
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and at <url url="http://www.breakertech.com/breaker/ice/ice.html#download">
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<item> "NMI Java decompiler" from NMI at
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<url url="http://njcv.htmlplanet.com">
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and at
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<url url="http://njcv.htmlplanet.com/njcv.html">
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<item> "SourceTech Java decompiler" from Source Tech corp at <url url="http://www.srctec.com">
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and at <url url="http://members.tripod.com/~SourceTec/jasmine.htm">
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<item> "Jad" Java Decompiler at
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<url url="http://www.geocities.com/SiliconValley/Bridge/8617/jad.html#general">
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and at
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<url url="http://www.geocities.com/SiliconValley/Bridge/8617/jad.html#gui">
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</itemize>
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<!--
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*******************************************
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************ End of Section ***************
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*******************************************
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<chapt> How can I trust Java Decompiler ??!!
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-->
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<sect> How can I trust Java Decompiler ??!!
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<p>
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For 100% assurance you need a <bf>SCIENTIFIC</bf> way to
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validate and trust the Java Decompiler program. The method described
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in this section will enable the decompiler program to be accepted
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as "trust-worthy" and reliable.
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In order to verify that the decompiler program
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is regenerating the Java source-code properly,
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use the following technique -
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Generate the class file from the generated
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source code using the compiler -
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<code>
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bash$ mv myprogram.class myprogram_orig.class
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bash$ javac myprogram.java
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</code>
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Now use the unix 'diff' command to compare the two class files -
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<code>
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bash$ diff myprogram.class myprogram_orig.class
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</code>
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Both these files <bf>MUST BE IDENTICAL</bf>. This verifies that
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decompiler program is working perfectly. On DOS or Windows 95 you may want to use
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the free <url name="Cygnus" url="http://www.cygnus.com"> Cygwin
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'diff' or 'MKS' utilities.
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This step gives 100% guarantee and 100% quality assurance
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and life term or long term <bf>WARRANTY</bf> on decompiler programs.
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It is strongly recommended that you do these steps
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every time you run decompiler programs.
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<!--
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*******************************************
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************ End of Section ***************
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*******************************************
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<chapt change> Related URLs
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-->
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<sect> Related URLs
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<p>
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Visit following locators which are related to Java -
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<itemize>
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<item> <url url="http://metalab.unc.edu/LDP/HOWTO/Vim-HOWTO.html" name="Vim color text editor for Java, C++, C">
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<item> <url url="http://metalab.unc.edu/LDP/HOWTO/C-C++Beautifier-HOWTO.html" name="Beautifier HOWTO for Java and C++ programs">
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<item> <url url="http://metalab.unc.edu/LDP/HOWTO/C++Programming-HOWTO.html" name="C++ Programming HOWTO has support Java like String objects">
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<item> Linux goodies main site <url url="http://www.aldev.8m.com">
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<item> Linux goodies mirror site <url url="http://aldev.webjump.com">
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</itemize>
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<!--
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*******************************************
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************ End of Section ***************
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*******************************************
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<chapt change> Other Formats of this Document
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-->
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<sect> Other Formats of this Document
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<p>
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This document is published in 11 different formats namely - DVI, Postscript,
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Latex, Adobe Acrobat PDF,
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LyX, GNU-info, HTML, RTF(Rich Text Format), Plain-text, Unix man pages and SGML.
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<itemize>
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<item>
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You can get this HOWTO document as a single file tar ball in HTML, DVI,
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Postscript or SGML formats from -
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<url url="ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO/other-formats/">
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<item>Plain text format is in: <url url="ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO">
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<item>Translations to other languages like French, German, Spanish,
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Chinese, Japanese are in
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<url url="ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO">
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Any help from you to translate to other languages is welcome.
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</itemize>
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The document is written using a tool called "SGML-Tools" which can be got from -
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<url url="http://www.sgmltools.org">
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Compiling the source you will get the following commands like
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<itemize>
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<item>sgml2html Java-Decompiler-HOWTO.sgml (to generate html file)
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<item>sgml2rtf Java-Decompiler-HOWTO.sgml (to generate RTF file)
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<item>sgml2latex Java-Decompiler-HOWTO.sgml (to generate latex file)
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</itemize>
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LaTeX documents may be converted into PDF files simply by
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producing a Postscript output using <bf>sgml2latex</bf> ( and dvips) and running the
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output through the Acrobat <bf>distill</bf> (<url url="http://www.adobe.com">) command as follows:
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<code>
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bash$ man sgml2latex
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bash$ sgml2latex filename.sgml
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bash$ man dvips
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bash$ dvips -o filename.ps filename.dvi
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bash$ distill filename.ps
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bash$ man ghostscript
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bash$ man ps2pdf
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bash$ ps2pdf input.ps output.pdf
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bash$ acroread output.pdf &
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</code>
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Or you can use Ghostscript command <bf>ps2pdf</bf>.
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ps2pdf is a work-alike for nearly all the functionality of
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Adobe's Acrobat Distiller product: it
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converts PostScript files to Portable Document Format (PDF) files.
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<bf>ps2pdf</bf> is implemented as a very small command script (batch file) that invokes Ghostscript, selecting a special "output device"
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called <bf>pdfwrite</bf>. In order to use ps2pdf, the pdfwrite device must be included in the makefile when Ghostscript was compiled;
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see the documentation on building Ghostscript for details.
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This howto document is located at -
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<itemize>
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<item> <url url="http://sunsite.unc.edu/LDP/HOWTO/Java-Decompiler-HOWTO.html">
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</itemize>
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Also you can find this document at the following mirrors sites -
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<itemize>
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<item> <url url="http://www.caldera.com/LDP/HOWTO/Java-Decompiler-HOWTO.html">
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<item> <url url="http://www.WGS.com/LDP/HOWTO/Java-Decompiler-HOWTO.html">
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<item> <url url="http://www.cc.gatech.edu/linux/LDP/HOWTO/Java-Decompiler-HOWTO.html">
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<item> <url url="http://www.redhat.com/linux-info/ldp/HOWTO/Java-Decompiler-HOWTO.html">
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<item> Other mirror sites near you (network-address-wise) can be found at
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<url url="http://sunsite.unc.edu/LDP/hmirrors.html">
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select a site and go to directory /LDP/HOWTO/Java-Decompiler-HOWTO.html
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</itemize>
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In order to view the document in dvi format, use the xdvi program. The xdvi
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program is located in tetex-xdvi*.rpm package in Redhat Linux which can be
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located through ControlPanel | Applications | Publishing | TeX menu buttons.
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To read dvi document give the command -
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<tscreen><verb>
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xdvi -geometry 80x90 howto.dvi
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man xdvi
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</verb></tscreen>
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And resize the window with mouse.
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To navigate use Arrow keys, Page Up, Page Down keys, also
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you can use 'f', 'd', 'u', 'c', 'l', 'r', 'p', 'n' letter
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keys to move up, down, center, next page, previous page etc.
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To turn off expert menu press 'x'.
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You can read postscript file using the program 'gv' (ghostview) or
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'ghostscript'.
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The ghostscript program is in ghostscript*.rpm package and gv
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program is in gv*.rpm package in Redhat Linux
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which can be located through ControlPanel | Applications | Graphics menu
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buttons. The gv program is much more user friendly than ghostscript.
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Also ghostscript and gv are available on other platforms like OS/2,
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Windows 95 and NT, you view this document even on those platforms.
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<itemize>
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<item>Get ghostscript for Windows 95, OS/2, and for all OSes from <url url="http://www.cs.wisc.edu/~ghost">
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</itemize>
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To read postscript document give the command -
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<tscreen><verb>
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gv howto.ps
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ghostscript howto.ps
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</verb></tscreen>
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You can read HTML format document using Netscape Navigator, Microsoft Internet
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explorer, Redhat Baron Web browser or any of the 10 other web browsers.
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You can read the latex, LyX output using LyX a X-Windows front end to latex.
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<!--
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*******************************************
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************ End of Section ***************
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*******************************************
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<chapt> Copyright
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-->
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<sect> Copyright
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<p>
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Copyright policy is GNU/GPL as per LDP (Linux Documentation project).
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LDP is a GNU/GPL project.
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Additional requests are - you retain the author's name, email address
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and this copyright notice on all the copies. If you make any changes
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or additions to this document then you should
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intimate all the authors of this document.
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<!--
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*******************************************
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************ End of Section ***************
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*******************************************
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-->
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</article>
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