Java Decompiler HOT!

JD-Core is a JAVA decompiler written in JAVA. JD-Core is a standalone JAVA library containing the JAVA decompiler of "Java Decompiler project". It support Java 1.1.8 to Java 10.0, including Lambda expressions, method references and default methods. JD-Core is the engine of JD-GUI.

EDIT: Thanks to everyone who replied, the post stays so that others can use. I decided to use jd-gui, but it's good to know many Java IDEs have plugins to do this too (I use Netbeans and I couldn't find a decompiler plugin for it)

Java Decompiler

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I had problems on several different machines to get the plugin running. Whenever I tried to open a .class file, the standard "Source not found" editor would show, displaying lowlevel bytecode disassembly, not the Java source output you'd expect from a decompiler.

I made the steps 1, 2, 3 and the 7. and I put the folder with the class files in the project build path (right click, properties, java build path, libraries, add class folder, create new folder, advanced>>, link to folder in the file system, browse,...) then restart eclipse.

Most decompilers for Java are based on JAD. It's a great tool, but unfortunately hasn't been updated for a while and does not handle Java 1.5+ classes very well. I have not seen any tools that will properly handle 1.5+ classes.

Originally intended just for use with the QuiltMC toolchain with Minecraft, Quiltflower quickly expanded to be a general purpose java decompiler aiming to create code that is as accurate and clean as possible.

If the name sounds familiar it's because Quiltflower is a fork of Fernflower, the (in)famous decompiler that was developed by Stiver, maintained by Jetbrains, and became the default decompiler in Intellij IDEA.

Fernflower also quickly found its way into many other tools.

When you write a java class with finally block & compile the source code, decompiled class shows bunch of byte code errors and server won't execute the code. Remove finally and it works.. any ideas how to make jd work with finally in the code?

I started using it to decompile one .class file at a time and quickly became bored. So tried the whole .jar file. It happily decompiled the file and returned a single zip file containing the decompiled .class files as .javafiles.

That may also be the reason why the debugger cannot always find the correct line for a breakpoint. If the .class-file was compiled with javac -g:none line-number info is not present in the .class file.

CFR will decompile modern Java features - up to and including much of Java 9, 12 & 14, but is written entirely in Java 6, so will work anywhere! (FAQ) - It'll even make a decent go of turning class files from other JVM languages back into java!

I am trying to decompile Minecraft, to see if I can analyze the code to make a few small changes, but I need a decompiler good enough so I can recompile it in a way that will work. I have tried multiple decompilers online like javadecompilers.com. However, they don't work well for a variety of reasons, like they either throw errors, or the code does not look like original code, like all the variable names are replaced with snowman emojis or \u+5 digit number, for example, \u26032. As for the snowman emojis, the java compiler won't be able to do distinguish different variables and cause name clashes. and for the \u numbers, the compiler might complain about stray \ in the program or something. Are there any easy to use compilers that work on Linux that are as accurate as possible, so accurate that decompiled code could be directly recompiled without having to fix the thousands of decompilation flaws?

Krakatau is probably the decompiler most likely to produce code equivalent in behavior to the original (unless the code is using Java 8 lambdas, which Krakaau doesn't support). However, it is not possible to roundtrip decompile in general because compilation and decompilation are both lossy processes. And if the code has been obfuscated as Minecraft is, you'll be lucky if the results of decompilation are even understandable, let alone compileable.

If you want to edit obfuscated code, you need to learn how Java bytecode works and edit it at the bytecode level. Fortunately, besides the decompiler, Krakatau provides a bytecode assembler and disassembler which makes it easy to edit Java bytecode, even if it has been obfuscated.

IntelliJ IDEA 2022.1 EAP 2 is now available, offering a series of improvements to the Java decompiler and QA tools, along with UI enhancements to the VCS tools, supported templates for Groovy, and a bundled TOML plugin.

The decompiler now supports modern language constructors such as sealed types and pattern matching. In addition, it features better switch over string decompilation, provides type annotations, and detects common constants using their names instead of literal values.

after i installed OpenJDK from8 to 12 i executed all commands to build it from this website GitHub - java-decompiler/jd-core: JD-Core is a JAVA decompiler written in JAVA. succesfully; until i executed ./gradlew build command and i got this error:

In the past few days, I had some fun trying to understand the inner workings of an APK file.Previously, I had only used the legendary JD-GUI as a decompiler for some CTF challenges.But when dealing with more complex code, I found that looking at the output of different decompilers can help.Hence, I did a little research to find more decompilers that use different approaches.This post serves as a little reference on how to build and use these tools.

Next up is Fernflower, which is part of IntelliJ IDEA.Everyone mentions that it is an analytical decompiler (as stated in their project description), but nobody points out what this actually means.I only found this Stackoverflow question, which unfortunately remains unanswered as of today.

GUI tools like Bytecode Viewer also use multiple decompilers under the hood and allow you to see their output nicely side-by-side.But I prefer going the manual way to see what parameters I can adjust.You have more control over how you launch a decompiler, and you will probably learn new things.

There is not really a kotlin to java converter yet, but one thing you can do is compile your kotlin code to jvm byte-code and then run a java decompiler. The code you get needs some cleaning up to be usable, but I guess it is a start.

Regradless of how much effort it would take to create a Kotlin-to-Java converter, creating such a project will run counter to the goals of JetBrains with regard to spreading the adoption of Kotlin, and therefore we have no plan to build it (or to improve the existing Java bytecode decompiler in IntelliJ IDEA so that it would handle Kotlin-generated bytecode better).

I have no sympathy for the people who opposed the release of Mocha. Itis just a tool and is not inherently "bad" or "wrong". Attempting to bantools like Mocha to prevent reverse engineering of software is like tryingto ban socket sets to prevent reverse engineering of automobiles.Disassemblers and decompilers for other languages have been available foryears, and have many legitimate uses.

JavaWorld published areviewcomparing Mocha to two other early Java decompilers, DejaVu and WingDis.More information on early java decompilers can be found in theJava Decompiler HOW-TO by Alavoor Vasudevan.

The only problem I can't solve is to permanently set "Class Decompiler Viewer" for *.class associations. After I set it the decompiler works fine, but after the restart Eclipse restores "Class File Viewer" as default association for *.class. I tried multiple different steps to update the class default association, but after each start Eclipse restores it to the "Class File Viewer", and I don't know how to prevent it from doing it. Any advice will be appreciated (note in decompiler settings I have the Startup flag checked to set the Decompiler as default viewer - it doesn't help)

But when I'm debugging an application and reach a file for which I don't have a source, the decompiler editor is not opened. Instead I see a "Source not found." editor with "Edit Source Lookup Path.." button.

Jad (Java Decompiler) is, as of August 2011[update], an unmaintained decompiler for the Java programming language.[1]Jad provides a command-line user interface to extract source code from class files.

I just downloaded a free program named "Java Decompiler Project", and ran it against some of my own Java class files, and sure enough, this Java decompiler said "Here's all your original Java source code; doesn't it look great?"

At the moment this is blowing my mind, because the last time I looked around for a Java decompiler, a tool named "JAD" was all I could find, and since it didn't work on the more recent JDK/SDK versions, I quit thinking about it. But this Java Decompiler Project took my Java JDK/SDK 5 code and reverse-engineered it back into the original Java source code in just a few moments.

So, lesson learned: Java decompiler tools are alive and well, and if you want to protect your Java class files from being decompiled, you better take a look at a Java obfuscator tool like yGuard or ProGuard, or you can kiss your IP (intellectual property) good-bye.

Procyon is a Java decompiler handling language enhancements from Java 5and beyond that most other decompilers don't. It also excels in areaswhere others fall short. Procyon in particular does well with: * Enum declarations * Enum and String switch statements * Local classes (both anonymous and named) * Annotations * Java 8 Lambdas and method references Other Packages Related to procyon-decompiler depends recommends suggests enhances dep:default-jre-headless (>= 2:1.7) Standard Java or Java compatible Runtime (headless) dep:libjcommander-java Java framework for parsing command line parameters dep:libprocyon-java (= 0.6.0-1) Procyon Framework Download procyon-decompiler Download for all available architectures ArchitecturePackage SizeInstalled SizeFiles all1,776.5 kB1,969.0 kB [list of files] This page is also available in the following languages (How to set the default document language): 2351a5e196