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.
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!
Java Decompiler For Mac Download
A Java Decompiler is a reverse engineering tool that accepts an executable java program as input then converts it into Java code that can be easily understood by software programmers. For the case of Java language, a Decompiler will convert a .class file into a readable java source file.
Java Decompiler project was majorly developed for decompiling Java 5 bytecode and other versions that came later. The decompiler can be used on three major operating systems which are Windows, Mac, and Linux. One reason for its massive popularity among Java developers is due to the fact that it can be easily integrated with commonly-used IDEs such as IntelliJ and Eclipse.
Cavaj is a free Java decompiler that you can use to convert bytecode, ZIP, and JAR files into Java source code. It can also come in handy when you want to decompile Java applets. Cavaj is specially developed for Windows operating system. This means that it may not favor you if you are using Mac or Linux.
Procyon is among the most popular open-source Java decompilers. One of its unique features is the capability to deal with Java 8. It can easily handle new features that were introduced from Java 5 to the latest version of java. Because of this reason, Procyon can be used as an alternative where other java versions fail.
AndroChef is another Java decompiler that is only available to Windows users. You can use it to decompile any java bytecode, even the ones that you think are very complex. Apart from just decompiling .class files, AndroChef can also deal with applets, JAR, DEX, and APK files. It has a user-friendly GUI that makes it an easy-to-use Java decompiler.
Arch Linux officially supports the open source OpenJDK versions 8, 11, 17 and 19. All these JVM can be installed without conflict and switched between using helper script archlinux-java. Several other Java environments are available in AUR but are not officially supported.
Two common packages are respectively pulled as dependency, named java-runtime-common (containing common files for Java Runtime Environments) and java-environment-common (containing common files for Java Development Kits). The provided environment file /etc/profile.d/jre.sh points to a linked location /usr/lib/jvm/default/bin, set by the archlinux-java helper script.
This is used to display and point to a working default Java environment in /usr/lib/jvm/java-$JAVA_MAJOR_VERSION-$VENDOR_NAME or a Java runtime in /usr/lib/jvm/java-$JAVA_MAJOR_VERSION-$VENDOR_NAME/jre.
Note the (default) denoting that java-11-openjdk is currently set as default. Invocation of java and other binaries will rely on this Java install. Also note on the previous output that only the JRE part of OpenJDK 8 is installed here.
If an invalid Java environment link is set, calling the archlinux-java fix command tries to fix it. Also note that if no default Java environment is set, this will look for valid ones and try to set it for you. Officially supported package "OpenJDK 8" will be considered first in this order, then other installed environments.
If you want to launch an application with another version of java than the default one (for example if you have both version 18 and 11 installed on your system), you can wrap your application in a small bash script to locally change the default PATH of java. For example if the default version is java 18 and you want to use java 11:
Alternatively, the javaagent JavaMatePatch, created to set the WM name in MATE and resolve the bug with java swing apps working incorrectly when launched in full screen, can be used. Add -javaagent:JavaMatePatch-1.0.0-SNAPSHOT.jar=window_manager_name to the java options to use it.
Setting the JDK_JAVA_OPTIONS environment variables makes java (openjdk) write to stderr messages of the form: 'Picked up JDK_JAVA_OPTIONS=...'. To suppress those messages in your terminal you can unset the environment variable in your /.bashrc and alias java to pass those same options as command line arguments:
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.
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