How to decompile to java files intellij idea

Question

IDEA has a great built-in feature - decompiler  It works great I can copy source code  but I cannot find option to extract all decompiled java classes to java files  This project has a lot of java classes and packages  so I will be to long to copy this manually  Does anyone know how to extract to java source files    Thx

User · Answer

I use JD-GUI for extract all decompiled java classes to java files

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You could use one of these  you can both use them online or download them  there is some info about each of them    http   www javadecompilers com   The one IntelliJ IDEA uses is fernflower  but it can t handle recent things - like String Enum switches  generics  didn t test this one personally  only read about it       I just tried cfr from the above website and the result was the same as with the built-in decompiler  except for the Enum switch I had in my class

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As of August 2017 and IntelliJ V2017 2  the accepted answer does not seem to be entirely accurate anymore  there is no fernflower jar to use    The jar file is called java-decompiler jar and does not include a main manifest    Instead you can use the following command  from a Mac install    java -cp   Applications IntelliJ IDEA app Contents plugins java-decompiler lib java-decompiler jar  org jetbrains java decompiler main decompiler ConsoleDecompiler    you will get the wrong Usage command  but it does work

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Someone had gave good answers  I made another instruction clue step by step  First  open your studio and search  You can find the decompier is Fernflower     Second  we can find it in the plugins directory    Applications Android Studio app Contents plugins java-decompiler lib java-decompiler jar   Third  run it  you will get the usage  java -cp   Applications Android Studio app Contents plugins java-decompiler lib java-decompiler jar  org jetbrains java decompiler main decompiler ConsoleDecompiler  Usage  java -jar fernflower jar  - lt option gt   lt value gt      lt source gt     lt destination gt  Example  java -jar fernflower jar -dgs true c  my source  c  my jar d  decompiled    Finally  The studio s nest options for decompiler list as follows according IdeaDecompiler kt  -hdc 0  -dgs 1  -rsy 1 -rbr 1  -lit 1  -nls 1 -mpm 60 -lac 1  IFernflowerPreferences HIDE DEFAULT CONSTRUCTOR to  0           IFernflowerPreferences DECOMPILE GENERIC SIGNATURES to  1           IFernflowerPreferences REMOVE SYNTHETIC to  1           IFernflowerPreferences REMOVE BRIDGE to  1           IFernflowerPreferences LITERALS AS IS to  1           IFernflowerPreferences NEW LINE SEPARATOR to  1             IFernflowerPreferences BANNER to BANNER            IFernflowerPreferences MAX PROCESSING METHOD to 60            IFernflowerPreferences INDENT STRING to indent              IFernflowerPreferences IGNORE INVALID BYTECODE to  1             IFernflowerPreferences VERIFY ANONYMOUS CLASSES to  1              IFernflowerPreferences UNIT TEST MODE to if  ApplicationManager getApplication   isUnitTestMode   1  else  0       I cant find the sutialbe option for the asterisk items   Hope these steps will make the question clear

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Some time ago I used JAD  JAva Decompiler  to achieve this - I do not think IntelliJ s decompiler was incorporated with exporting in mind  It is more of a tool to help look through classes where sources are not available   JAD is still available for download  but I do not think anyone maintains it anymore  http   varaneckas com jad   There were numerous plugins for it  namely Jadclipse  you guessed it  a way to use JAD in Eclipse - see decompiled classes where code is not available

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To use the IntelliJ Java decompiler from the command line for a jar package follow the instructions provided here  https   github com JetBrains intellij-community tree master plugins java-decompiler engine

User · Answer

Try  https   github com fesh0r fernflower  Download jar from   http   files minecraftforge net maven net minecraftforge fernflower   Command    java -jar fernflower jar -hes 0 -hdc 0 C  binary  C  source   Place your jar file in folder C  binary and source will be extracted and packed in a jar inside C  source   Enjoy

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The decompiler of IntelliJ IDEA was not built with this kind of usage in mind  It is only meant to help programmers peek at the bytecode of the java classes that they are developing  For decompiling lots of class files of which you do not have source code  you will need some other java decompiler  which is specialized for this job  and most likely runs standalone  If you google you should find a bunch

User · Answer

Follow instructions for IntelliJ JD plugin  Or see an excerpt from the instructions below   java -jar fernflower jar   lt source gt     lt destination gt         means 1 or more times    lt source gt   file or directory with files to be decompiled  Directories are recursively scanned  Allowed file extensions are class  zip and jar     lt destination gt   destination directory   Example   java -jar fernflower jar -hdc 0 -dgs 1 -rsy 1 -lit 1 c  Temp binary  -e c  Java rt jar c  Temp source    Be aware that if you pass it a   jar  file for the source  it will create another   jar  file in the destination  however  within the new   jar  file  the files will be  java instead of  class files  it doesn t explode the jar      UPDATE  People ask me  How do I get the fernflower jar   If you have any IntelliJ product installed  chances are that you already have the Fernflower decompiler on your computer  IntelliJ IDEA comes with Java Bytecode Decompiler plugin  bundled  which is a modern extension of Fernflower     Locate the file in   IntelliJ INSTALL DIR  plugins java-decompiler lib java-decompiler jar  example  C  Program Files JetBrains IntelliJ IDEA 2018 plugins java-decompiler lib   Copy it somewhere and rename to fernflower jar  optional   This JAR is not executable  so we can t run it using java -jar  However something like this works   java -cp fernflower jar org jetbrains java decompiler main decompiler ConsoleDecompiler   lt source gt     lt destination gt    org jetbrains java decompiler main decompiler ConsoleDecompiler is the class that contains the main method to run the decompiler   Example   mkdir output src java -cp fernflower jar org jetbrains java decompiler main decompiler ConsoleDecompiler -hdc 0 -dgs 1 -rsy 1 -lit 1   input jar   output src    If you don t have IntelliJ products installed  either download it now  available on jetbrains com  or make your own decompiler executable from sources  available on Github

[java] How to decompile to java files intellij idea

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