How to decompile a whole Jar file

Question

Does anyone know of a free decompiler that can decompile an entire Jar file instead of a single class  I have a problem with sub classes like name 1 class name 2 class name class

User · Answer

First of all  it s worth remembering that all Java archive files   jar  war etc     are all basically just fancy zip files  with a few added manifests and metadata   Second  to tackle this problem I personally use several tools which handle this problem on all levels    Jad   Jadclipse while working in IDE for decompiling  class files WinRAR  my favorite compression tool natively supports Java archives  again  see first paragraph   Beyond Compare  my favorite diff tool  when configured correctly can do on-the-fly comparisons between any archive file  including jars  Well worth a try    The advantage of all the aforementioned  is that I do not need to hold any other external tool which clutters my work environment  Everything I will ever need from one of those files can be handled inside my IDE or diffed with other files natively

User · Answer

You extract it and then use jad against the dir

User · Answer

I have had reasonable success with a tool named  frustratingly   JD  Java Decompiler    I have found it better than most decompilers when dealing with classes compiled for Java 5 and higher  Unfortunately  it can still have some hiccups where JAD would normally succeed

User · Answer

Insert the following into decompile jar sh    Usage  decompile jar sh some jar  -d     clean target folders function clean target     rm -rf  unjar  src  jad log      clean all debug stuff function clean stuff     rm -rf  unjar  jad log      the main function function work     jar  1   unjar  basename  jar unjar    src  basename  jar src    jad log jad log    clean target    unzip -q  jar -d  unjar   jad -d  src -ff -r -lnc -o -s java  unjar      class  gt   jad log 2 gt  amp 1    if      debug    then     clean stuff   fi    if   -d  src        then       echo   jar has been decompiled to  src      else       echo  Got some problems check output or run in debug mode    fi    function usage     echo  This script extract and decompile JAR file    echo  Usage   0 some jar  -d     echo      where  some jar is the target to decompile    echo      use -d for debug mode       check params if   -n   1      then     if     2      -d     then       debug true       set -x     fi     work  1   else     usage fi    chmod  x decomplie jar sh   executable ln -s   decomplie jar s  usr bin dj   Ready to use  just type dj your jar and you will get your jar src folder with sources  Use -d option for debug mode

User · Answer

2009  JavaDecompiler can do a good job with a jar  since 0 2 5  All files  in JAR files  are displayed   See also the question  quot How do I    decompile    Java class files  quot   The JD-Eclipse doesn t seem to have changed since late 2009 though  see Changes   So its integration with latest Eclipse  3 8  4 2   might be problematic  JD-Core is actively maintained  Both are the result of the fantastic work of  SO user  Emmanuel Dupuy   2018  A more modern option  mentioned in the comments by David Kennedy Araujo  JetBrains intellij-community plugins java-decompiler engine  Fernflower is the first actually working analytical decompiler for Java and probably for a high-level programming language in general  java -jar fernflower jar  - lt option gt   lt value gt      lt source gt     lt destination gt   java -jar fernflower jar -hes 0 -hdc 0 c  Temp binary  -e c  Java rt jar c  Temp source    See also How to decompile to java files intellij idea for a command working with recent IntelliJ IDEA

User · Answer

If you happen to have both a bash shell and jad   JAR  your jar file name  unzip -d  JAR tmp  JAR pushd  JAR tmp for f in  find   -name    class    do     jad -d   dirname  f  -s java -lnc  f done popd   I might be a tiny  tiny bit off with that  but it should work more or less as advertised   You should end up with  JAR tmp containing your decompiled files

User · Answer

Something like   jar -xf foo jar  amp  amp  find   -iname    class    xargs  opt local bin jad -r   maybe

User · Answer

Note  This solution only works for Mac and  nix users   I also tried to find Jad with no luck  My quick solution was to download MacJad that contains jad  Once you downloaded it you can find jad in  where-you-downloaded-macjad  MacJAD Contents Resources jad

[java] How to decompile a whole Jar file?

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