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Java Tools


Tool name: Java Decompiler
Rating: 5.0 (1 vote)
Author: Java Decompiler project                        
Website: http://java.decompiler.free.fr
Current version: 0.3.2
Last updated: March 20, 2010
Direct D/L link: N/A
License type: Free
Description: The “Java Decompiler project” aims to develop tools in order to decompile and analyze Java 5 “byte code” and the later versions.

JD-Core is a freeware library that reconstructs Java source code from one or more “.class” files. JD-Core may be used to recover lost source code and explore the source of Java runtime libraries. New features of Java 5, such as annotations, generics or type “enum”, are supported. JD-GUI and JD-Eclipse include JD-Core library.

JD-GUI is a standalone graphical utility that displays Java source codes of “.class” files. You can browse the reconstructed source code with the JD-GUI for instant access to methods and fields.

JD-Eclipse is a plug-in for the Eclipse platform. It allows you to display all the Java sources during your debugging process, even if you do not have them all.

JD-Core, JD-GUI and JD-Eclipse are free for non-commercial use. This means that JD-Core, JD-GUI and JD-Eclipse shall not be included or embedded into commercial software products. Nevertheless, these projects may be freely used for personal needs in a commercial or non-commercial environments.
Also listed in: Java Decompilers
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Tool name: Javassist
Rating: 5.0 (1 vote)
Author: Shigeru Chiba                        
Website: http://www.csg.is.titech.ac.jp/~chiba/javassist/
Current version: 3.12.0.GA
Last updated: April 16, 2010
Direct D/L link: N/A
License type: Free
Description: Javassist (Java Programming Assistant) makes Java bytecode manipulation simple. It is a class library for editing bytecodes in Java; it enables Java programs to define a new class at runtime and to modify a class file when the JVM loads it. Unlike other similar bytecode editors, Javassist provides two levels of API: source level and bytecode level. If the users use the source-level API, they can edit a class file without knowledge of the specifications of the Java bytecode. The whole API is designed with only the vocabulary of the Java language. You can even specify inserted bytecode in the form of source text; Javassist compiles it on the fly. On the other hand, the bytecode-level API allows the users to directly edit a class file as other editors.

Aspect Oriented Programming: Javassist can be a good tool for adding new methods into a class and for inserting before/after/around advice at the both caller and callee sides.

Reflection: One of applications of Javassist is runtime reflection; Javassist enables Java programs to use a metaobject that controls method calls on base-level objects. No specialized compiler or virtual machine are needed.
Also listed in: Java Code Injection Tools, Java Executable Editors & Patchers
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Tool name: radare
Rating: 5.0 (1 vote)
Author: pancake                        
Website: http://www.radare.org
Current version: 1.5
Last updated: December 13, 2009
Direct D/L link: http://www.radare.org/get/radare-1.5.tar.gz
License type: GPL
Description: <nowiki>The radare project aims to provide a complete unix-like toolchain for working with binary files. It currently provides a set of tools to work with x86, arm and java with some ones powerpc.

The core is a raw hexadecimal editor for commandline with scripting features and perl/python extensions that gets extended with IO plugins that hooks the open/read/write/close/system calls.

The debugger and disassembler has a code analysis module for x86, mips, arm and java. This way it's possible to draw graphs using Cairo on a GTK window or store the flow execution of a program on a log file and use the information to diff't against another trace or binary.

The toolchain provides assemblers and disasemblers for x86, arm, mips (Loongson2F), sparc, CSR, m68k, powerpc, msil and java.

The disassembler has been enhaced to handle inline comments, code block detections and flag references (data pointers or so).

The debugger is mainly developed on linux and {Net
Also listed in: .NET Disassemblers, Assemblers, Binary Diff Tools, Code Injection Tools, Debuggers, Disassemblers, Hex Editors, Java Disassembler Libraries, Linux Debuggers, Linux Disassemblers, Linux Tools, Memory Dumpers, Memory Patchers, Process Dumpers, Reverse Engineering Frameworks, Ring 3 Debuggers, String Finders, Symbol Retrievers, SysCall Monitoring Tools, Tracers
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Tool name: Jad
Rating: 4.0 (1 vote)
Author: Pavel Kouznetsov                        
Website: http://www.kpdus.com/jad.html
Current version: 1.5.8g
Last updated: July 2, 2006
Direct D/L link: Locally archived copy
License type: Free
Description: Jad - the fast JAva Decompiler

Jad is a Java decompiler, i.e. program that reads one or more Java class files and converts them into Java source files which can be compiled again.

Jad is a 100% pure C++ program and it generally works several times faster than decompilers written in Java.
Jad doesn't use the Java runtime for its functioning, therefore no special setup is required (like changes to the CLASSPATH variable).

Jad can be used:

* for recovering lost source codes;
* for exploring the sources of Java runtime libraries;
* as a Java disassembler;
* as a Java source code cleaner and beautifier. just kidding

Jad expects that supplied Java class files are valid ones, i.e. they can pass the Java Virtual Machine (JVM) verification successfully.

The Jad main features:

* Enhanced readability of the generated source code.
* Ability to comment Java source code with JVM bytecodes. Useful for verification and educational purposes.
* Full support for inner and anonymous classes.
* Fast decompilation and simple setup.
* Automatic conversion of identifiers garbled by Java obfuscators into valid ones.
* Free for non-commercial use. If you would like to use Jad for commercial purposes, please contact me for conditions.
Also listed in: Java Decompilers
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Tool name: BCEL
Rating: 0.0 (0 votes)
Author: The Apache Jakarta Project                        
Website: http://jakarta.apache.org/bcel
Current version: 5.2
Last updated: June 6, 2006
Direct D/L link: N/A
License type: Free / Open Source
Description: The Byte Code Engineering Library is intended to give users a convenient possibility to analyze, create, and manipulate (binary) Java class files (those ending with .class). Classes are represented by objects which contain all the symbolic information of the given class: methods, fields and byte code instructions, in particular.

Such objects can be read from an existing file, be transformed by a program (e.g. a class loader at run-time) and dumped to a file again. An even more interesting application is the creation of classes from scratch at run-time. The Byte Code Engineering Library (BCEL) may be also useful if you want to learn about the Java Virtual Machine (JVM) and the format of Java .class files.

BCEL contains a byte code verifier named JustIce, which usually gives you much better information about what's wrong with your code than the standard JVM message.

BCEL is already being used successfully in several projects such as compilers, optimizers, obsfuscators, code generators and analysis tools. Unfortunately there hasn't been much development going on over the past few years.
Also listed in: Java Disassembler Libraries
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Tool name: DJ Java Decompiler
Rating: 0.0 (0 votes)
Author: A. Neshkov                        
Website: http://members.fortunecity.com/neshkov/dj.html
Current version: 3.10.10.93
Last updated: February 21, 2008
Direct D/L link: Locally archived copy
License type: Free
Description: With DJ Java Decompiler you can decompile java CLASS files and save it in text or other format. It's simple and easy.
DJ Java Decompiler is Windows 95/98/Me/NT/2000/XP/2003/Vista decompiler and disassembler for Java that reconstructs the original source code from the compiled binary CLASS files (for example Java applets). DJ Java Decompiler is able to decompile complex Java applets and binaries, producing accurate source code. DJ Java Decompiler is a stand-alone Windows application; it doesn't require having Java installed! DJ Java Decompiler is not just Java decompiler and disassembler but it is also a fully featured Java editor using the graphic user interface with syntax-coloring. Using DJ Java Decompiler is easy. Select Open and load your desired class file, or just double-click the CLASS file you want to decompile. DJ Java Decompiler supports drag-and-drop functions for OLE. You will see the source code instantly! In Windows Explorer Right mouse-button pop-up menu available too. You can decompile or disassembler a CLASS files on your computer hard disk or on a network drive that you have a connection to (you must have a full access rights or just change the default output directory for .jad files). You don't need to have the Java Virtual Machine or any other Java SDK installed. But this latest release is able to compile, run, create JAR archives and run applets outside of the context of a Web browser when JDK is installed. With DJ Java Decompiler you can decompile more than one java class file at one time. This release enables users to decompile "dead" parts of code.
DJ Java Decompiler is suitable for studying JAVA bytecode. DJ Java Decompiler enables users to save, print, edit and compile the generated java code (see Why is a DJ Java Decompiler useful). Included Applet Tag Editor enables users to create applets quickly. Included "Archiver" tool is a simple archive file manager wich enables users to work with .JAR, .ZIP and .EXE archives (see New features in version 3.10.10.93 and New features in version 3.9.9.91)
DJ Java Decompiler is a graphical decompiler and disassembler for Windows 95/98/Me/NT/2000/XP/2003/Vista that uses the command-line version of Jad as its decompiling engine.
DJ Java Decompiler is written and supported by Atanas Neshkov. If you have any questions, bug reports or comments regarding DJ Java Decompiler, please send e-mail to at_neshkov@yahoo.com
DJ Java Decompiler 3.7.7.81 is a freeware software. I hope you will enjoy having it and will find it useful to you! If you like this program and want to help it's author to continue working on it and improving it, you may contribute a modest / small donation, which I would be extremely grateful to receive from you!
Also listed in: Java Decompilers
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Tool name: jclasslib
Rating: 0.0 (0 votes)
Author: ej-technologies                        
Website: http://www.ej-technologies.com/products/jclasslib/overview.html
Current version: 3.0
Last updated: January 14, 2005
Direct D/L link: Locally archived copy
License type: Free / Open Source
Description: jclasslib bytecode viewer is a tool that visualizes all aspects of compiled Java class files and the contained bytecode. In addition, it contains a library that enables developers to read, modify and write Java class files and bytecode.
Also listed in: Java Disassembler Libraries
More details: Click here for more details, screenshots, related URLs & comments for this tool! (or to update its entry)


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