HOWTO: install JODE Java decompiler and Jode Eclipse Plugin

[gasull]

JODE (Java Optimize and Decompile Environment) seems to be the best Java decompiler available. But the installation of JODE and JodeEclipse is far from straightforward:

• NB: The JODE Makefile created a wrong executable that I needed to modify.
• NB: The JodeEclipse plugin you get from the update server said at JodeEclipse website doesn't work (at least it didn't for me with Eclipse 3.4).

I decided to write this tutorial after successfully installing them.

1. Install Java Getopt:

   sudo aptitude install libgetopt-java

2. Download the JODE JAR file from SourceForge. We need just the .jar, not the .tar.gz.
3. Place the JODE JAR in /usr/local/share/java/:
   

   sudo mkdir /usr/local/share/java #If it doesn't exists yet
   sudo chmod 755 /usr/local/share/java
   sudo cp jode-1.1.2-pre1.jar /usr/local/share/java/
   sudo chmod 644 /usr/local/share/java/jode-*.jar

4. Create the jode executable:
   

   sudo gedit /usr/local/bin/jode #Or with Vim, etc.

   Write this in the editor:
   

   #!/bin/bash
   prefix=/usr/local
   
   case $1 in
     [Ss]wi*) CLAZZ=jode.swingui.Main; shift ;;
     [Dd]ec*) CLAZZ=jode.decompiler.Main; shift ;;
     [Oo]bf*) CLAZZ=jode.obfuscator.Main; shift ;;
   	*) CLAZZ=jode.decompiler.Main ;;
   esac
   
   #CP=`echo $CLASSPATH | sed s/:/,/`
   CLASSPATH=${prefix}/share/java/jode-1.1.2-pre1.jar:/usr/share/java/gnu-getopt.jar:.
   echo Executing: /usr/bin/java -classpath $CLASSPATH $CLAZZ $*
   /usr/bin/java -classpath $CLASSPATH $CLAZZ $*

   And give it the right permissions once the you close the file:
   

   sudo chmod 755 /usr/local/bin/jode

5. We already have JODE installed. Now we get JodeEclipse plugin from SourceForge.
6. Place the plugin into the Eclipse plugin directory:
   

   sudo cp net.sourceforge.jode_1.0.6.jar /usr/lib/eclipse/plugins/

That's all. You might be interested also in installing the Bytecode Outline plugin from ASM ObjectWeb, specially for those classes that JODE fails to decompile.

HTH.

[davidgaya]

Thanks very much, you save me a lot of time.


How to build and install edge JODE

junit package is a requirement to run tests

sudo aptitude install junit

htp package is a requirement to build documentation

sudo aptitude install htp

Check your java compiler version is at least 1.2

javac -version

Download last svn trunk

svn co https://jode.svn.sourceforge.net/svnroot/jode/trunk/jode jode

Go into downloaded directory

cd jode

Build java files into class files

ant build

Run tests to see everything is correct

ant test

Build jar files

ant release-bindist

Your newly created jode file is in
release/jode-1.90-CVS/jode.jar

Follow gasull instructions except that there is an important change.

Note !
Jode java classes are in net.sf.jode.* path.
You must modify script to something like this:

!/bin/bash
prefix=/usr/local

case $1 in
  [Ss]wi*) CLAZZ=net.sf.jode.swingui.Main; shift ;;
  [Dd]ec*) CLAZZ=net.sf.jode.decompiler.Main; shift ;;
  [Oo]bf*) CLAZZ=net.sf.jode.obfuscator.Main; shift ;;
    *) CLAZZ=net.sf.jode.decompiler.Main ;;
esac

#CP=`echo $CLASSPATH | sed s/:/,/`
CLASSPATH=${prefix}/share/java/jode.jar:/usr/share/java/gnu-getopt.jar:.
#echo Executing: /usr/bin/java -classpath $CLASSPATH $CLAZZ $*
/usr/bin/java -classpath $CLASSPATH $CLAZZ $*