Try to invoke main class org.jetbrains.java.decompiler.main.decompiler.ConsoleDecompiler manually
java -cp java-decompiler.jar org.jetbrains.java.decompiler.main.decompiler.ConsoleDecompiler myclassfile.class .
Also you can find more about internal usage of Fernflower inside IDEA by query in source code https://github.com/JetBrains/intellij-community/search?utf8=%E2%9C%93&q=Fernflower
Answer from qwazer on Stack OverflowBytecode
the.bytecode.club › showthread.php
FernFlower - CLI Java Decompiler
FernFlower has recently become open sourced, you can view the repo at https://github.com/JetBrains/intellij-co...decompiler If you're looking for GUI FernFlower, download Bytecode Viewer - https://github.com/Konloch/bytecode-viewer/releases Basic Decompile: ... java -jar fernflower.jar ...
GitHub
github.com › JetBrains › fernflower
GitHub - JetBrains/fernflower: Decompiler from Java bytecode to Java, used in IntelliJ IDEA.
The Fernflower IDE plugin is bundled in IntelliJ IDEA. Open any .class file and you should see the decompiled Java source code: this is Fernflower in action. The plugin is also open-source and can be found here. java -jar fernflower.jar [-<option>=<value>]* [<source>]+ <destination>`
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GitHub
github.com › fesh0r › fernflower
GitHub - fesh0r/fernflower: Unofficial mirror of FernFlower Java decompiler (All pulls should be submitted upstream)
java -jar fernflower.jar -dgs=1 c:\Temp\binary\library.jar c:\Temp\binary\Boot.class c:\Temp\source\
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Jar-Download
jar-download.com › home › org.jboss.windup.decompiler › decompiler-fernflower › 3.0.0.final › source code
Download decompiler-fernflower JAR 3.0.0.Final ➔ With all dependencies!
Download decompiler-fernflower JAR 3.0.0.Final ✓ Free ✓ With dependencies ✓ Source of decompiler-fernflower ☄ One click! ☄
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Try to invoke main class org.jetbrains.java.decompiler.main.decompiler.ConsoleDecompiler manually
java -cp java-decompiler.jar org.jetbrains.java.decompiler.main.decompiler.ConsoleDecompiler myclassfile.class .
Also you can find more about internal usage of Fernflower inside IDEA by query in source code https://github.com/JetBrains/intellij-community/search?utf8=%E2%9C%93&q=Fernflower
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You can get it looking at JetBrains releases: https://www.jetbrains.com/intellij-repository/releases/
Download the java-decompiler-engine.jar which will actually have the version name, but for simplicity I'll save it as c:\t\dl\jde.jar on my pc.
Then this for example will decompile the jar file for the game Necesse where I have it installed on my PC. The output seems to go into a jar file with the same name in the directory specified, here creating c:\t\Necesse.jar with the .java files in it (command split into lines for readability):
java -cp c:\t\dl\jde.jar
org.jetbrains.java.decompiler.main.decompiler.ConsoleDecompiler
'c:\games\steam\steamapps\common\Necesse\Necesse.jar'
c:\t
Maven Repository
mvnrepository.com › artifact › org.jboss.windup.decompiler › decompiler-fernflower › 2.3.0.Final
Maven Repository: org.jboss.windup.decompiler » decompiler-fernflower » 2.3.0.Final
Home » org.jboss.windup.decompiler » decompiler-fernflower » 2.3.0.Final · Windup Engine Decompiler Fernflower · Note: There is a new version for this artifact · Maven · Gradle · SBT · Mill · Ivy · Grape · Leiningen · Buildr · Scope: compile · test · provided ·
JetBrains
youtrack.jetbrains.com › issue › IDEA-175638 › Please-release-fernflower-decompiler-as-a-standalone-jar
Please release fernflower decompiler as a standalone jar
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Jar-download
jar-download.com
Download fernflower JAR files with all dependencies
Download JAR files for fernflower ✓ With dependencies ✓ Documentation ✓ Source code
Jarcasting
jarcasting.com › artifacts › org.jboss.windup.decompiler › decompiler-fernflower › 3.0.0.Final
org.jboss.windup.decompiler » decompiler-fernflower » 3.0.0.Final - jar download | JarCasting
Download package files of org.jboss.windup.decompiler » decompiler-fernflower » 3.0.0.Final and jars with java source files
GitHub
github.com › 6168218c › FernflowerUI
GitHub - 6168218c/FernflowerUI: The fernflower decompiler with GUI.
Save the Jar file by clicking the Save button.
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npm
npmjs.com › package › fernflower
fernflower - npm
A fernflower <jarFile> <outputDir> cli can be installed with npm install -g fernflower ·
» npm install fernflower
Published Apr 01, 2016
Version 1.1.0
Author Romain Beaumont
Repository https://github.com/rom1504/node-fernflower
JitPack
jitpack.io › p › fesh0r › fernflower
JetBrains / fernflower Download
java -jar fernflower.jar -dgs=1 c:\Temp\binary\library.jar c:\Temp\binary\Boot.class c:\Temp\source\
YouTube
youtube.com › watch
How to create fernflower JAR and decompile Kotlin class to Java using a command line? - YouTube
fernflower is used internally by Intellij IDEA as a decompiler. If you have a use case to decompile Kotlin classes to Java using the command line, this video...
Published April 21, 2021
YouTube
youtube.com › wernerware
Fernflower Decompiler for Java - YouTube
Use Fernflower to decompile java code from .class and .jar files. This video shows you how to do it without IntelliJ Video notes: https://github.com/wernerwa...
Published June 16, 2018 Views 5K
Rune-Server
rune-server.org › forums › runescape development › rs2 server › help
OSRS - How To Download & Decompile Gamepack With Fernflower? | Rune-Server
December 26, 2018 - So I am trying to extract the Gamepack.jar decompiled and refactored, which seems to be really easy for Fernflower but I can't seem to get things working. https://github.com/Velocity-/fernflower-improved doesnt contain the actual Fernflower.jar, do I need to download IntelliJ or Eclipse to build the jar file from there?
SoftTeco
softteco.com › home › java development › fernflower java decompiler
Fernflower Java Decompiler
July 3, 2025 - Home > Java Development > Fernflower Java Decompiler · 1 min read · Updated · 03.07.2025 · Author · SoftTeco Team · Share · java -jar fernflower.jar mms-stubs.jar mms-stubs-sources.jar · No posts for this criteria. Kotlin Development Company · READ MORE · Our Locations ·
Maven Central Repository
search.maven.org › artifact › org.jboss.windup.decompiler › decompiler-fernflower › 4.3.1.Final › jar
decompiler-fernflower
Official search by the maintainers of Maven Central Repository
Jamie Tanna
jvt.me › posts › 2021 › 12 › 20 › java-decompile-command-line
Decompiling Java Class Files On the Command-Line · Jamie Tanna | Software Engineer
December 20, 2021 - cd /path/to/source-repo # build the project java -jar build/libs/fernflower.jar <args>
SpigotMC
hub.spigotmc.org › stash › projects › SPIGOT › repos › builddata › browse › bin › fernflower.jar
Source of fernflower.jar - BuildData - SpigotMC Stash
Learn more about cloning repositories · You have read-only access
JetBrains
plugins.jetbrains.com › plugin › 8047-decompile-and-attach
Decompile and Attach - IntelliJ IDEs Plugin | Marketplace
GitHub | Issues | decompiles jar package using Intellij's build in Fernflower decompiler and attaches decompiled sources to project. the purpose is to have a...