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!
If you want to advertise with DJ Java Decompiler, please mail to at_neshkov@yahoo.com !
new version: Download version 3.10.10.93 from
Download.com
"There are only 10 types of people in the world: Those who understand binary and those who don't."
DJ Java Decompiler is intuitive enough that you can probably skip the instructions. Once you have downloaded and installed the DJ Java Decompiler, use the "File" - "Open" dialog to open your CLASS or JAR file.
You can do one of the following (the choice is yours):
Select "File | Open" and load your desired class file. Select "File | Open in New Window" if you want to open the class file in new program instance.
Double-click the CLASS file you want to decompile.
Drag-and-drop. Drag your desired class file into DJ Java Decompiler or drop the file onto the DJ Java Decompiler icon on the desktop.
DJ Java Decompiler supports drag-and-drop functions for OLE.
In Windows Explorer right mouse-button pop-up menu is available too. - "Open with DJ"
To decompile a .JAR file: Select "File | Open" and load your desired jar file. This jar file will be loaded in the "Archiver" tool. Use "Archiver" tool to decompile a single class file inside the selected archive or all class tree. To decompile a single class file inside the JAR archive - just double-click the class file.
You will see the source code instantly!
Important Note: When the user copy & paste a .class file (for example MyClassFile.class) from "Temporary Internet Files" folder
to a standard file folder Windows may suffix (rename) this file. Windows concatenates the original file name and "[number]" string as following:
MyClassFile.class --> MyClassFile[1].class.
In some cases DJ Java Decompiler will be unable to decompile the suffixed file MyClassFile[1].class, causing an error:
"File access error, or file not exists. Check all and try again! Possible reasons: the file MyClassFile[1].class is corrupted".
To solve the problem user needs to restore the original file name: MyClassFile[1].class --> MyClassFile.class.
Also JAD expects that supplied Java class files are valid ones, i.e. they can pass the The JavaTM Virtual Machine Specification (JVM) successfully.
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. Click on a picture to see more!
With DJ Java Decompiler you can decompile more than one Java compiled class file at one time.
New features in the next version 3.10.10.93 (21 February, 2008) :
"View" - "Hexadecimal View" (F11) menu item is added. Just like a dedicated hex editor, "Hexadecimal View" shows byte offsets at the left, hexadecimal representation in the middle, and textual representation at the right. Uses the same color scheme as for the editor. This view lets you examine the file at the lowest possible level. You can search hexadecimal characters or words in this view (Ctrl+F). "Go to offset..." (F8) popup menu item is available too.
Changes in decompiling engine.
Microsoft® Windows® VistaTM compatibility. The application settings and configuration files are stored in the appropriate user data folder (CSIDL_APPDATA). DJ Java Decompiler creates a different set of configuration files for each user. "Settings" - "Associate DJ with…" will affect HKEY_CURRENT_USER only. If you encounter a technical problem and you are running Windows® VistaTM , please report it to: Atanas Neshkov
New text formatting capabilities. "Edit" - "Change Case" - "Invert Case"; "Edit" - "ROT-13" and "ROT-47" options added - for simple character encryption and decryption.
"View" - "Attributes" displays new attributes in Java 1.6. This will display properly the InnerClasses attribute.
"View" - "Class version info" shows the JVM version, major and minor version of the currently opened class file.
"View" - "Fields" now shows all field_info structure: access_flags, attributes_count and attributes. "Save to file" popup menu item is available too.
Changes and bug fixes in "View" - "Methods, Interfaces and Constant Pool". "Exception Table" tab added to display the exception table of the method. Bug fixes in "Methods" - "Disassembly" tab. "Line Number" shows currently selected line number. In "Data" tab you can see the hexadecimal, decimal and binary representation of the selected byte offset. "Save to file…" popup menu item is available for "Constant Pool" tab. "Search in Constant Pool" feature is added.
"Tools" - "Change multiple files extension" With this tool you can easily rename multiple files that have the same file extension. Also, you can rename all files in sub-directories recursively.
"Tools" - "CRC Calculator" added. Calculates CRC16, CRC32, MD5, SHA1 hashes and checksum of a file or string.
"Tools" - "HEX-DEC-BIN Calculator" added. This is a simple hexadecimal, decimal and binary calculator (converter).
"Tools" - "Packages Tree" shows JavaTM Platform, Standard Edition 6 packages tree. This enables you to insert the selected package into the editor or to the clipboard.
"Command prompt" button added. Reads "ComSpec" system environment variable and opens a DOS window in the specified in "Configuration" initial directory.
"View" - "Java Version" shows currently installed Java version.
"View" - "Java Control Panel" shows Java Control Panel applet.
"View" - "Character Map" menu item is added.
"Extract All Files" bug is fixed in "Archiver" tool.
Changes and bug fixes in all "Search" menu items.
Bug fixes in "Refresh" and "Toggle to Bytecode / Sourcecode view".
New menu items in "View" menu added, allows more detailed view of the methods, Constant Pool, interfaces, and attributes.
DJ displays new access flags in Java 1.5: ACC_ENUM, ACC_ANNOTATION, ACC_BRIDGE, ACC_VARARGS
Changes in "Archiver" tool,
allows to change the default output file(s) extension(s) (default is .jad)
New features in "Compile", "Run", "JAR" and "Appletviewer".
"Associate DJ with": .class, .java, .jar and .jad files menuitem added in "Settings" menu. This allows DJ to start automatically when user open these files from Windows Explorer, My Computer, etc.
Double-click in "Fields" shows more information about type and interpretation of the field types
New decompiler options added. "Display long integers using the specified radix"
and "Display integers using the specified radix" - 8, 10 or 16 options added.
Ctrl+F4 - File|Close Shortcut is added
New features in "Configuration" -> "Appearance and colors" forms added ("Adjust line breaks").
Some bugs fixed: "Indents/Outdents block" bug is fixed, problem with suffixed, prefixed or
renamed .class files is fixed, "Line too long" bug is fixed, syntax colorizing bug is fixed ...
Changes in "Archiver" tool. This is a complete File Manager type of program that lets
you create or view archives, extract files from archives, decompile .class files
from archives, etc. Option "Use folder names stored in archive" added when decompiling files in
.jar files enables users to decompile all class tree.
"Export to HTML" (31 day evaluation period) tool added.
"Edit" -> "Comment" menuitem added to comment selected text (Ctrl+Alt+C).
New decompiler options added. "Debug mode" and "Generate additional casts.." options added.
New features in "Compile" and "Run" forms added. Many bugs fixed.
New zip dll 's for "Archiver" tool.
Changes in syntax colorizing many bugs fixed.
Changes in "Decompile more files..." form added, many bugs fixed.
Some bugs is fixed: "Indents/Outdents block" bug is fixed, problem with suffixed, prefixed or
renamed .class files is fixed, ...
Changes in "Archiver" tool. This is a complete File Manager type of program that lets
you create or view archives, extract files from archives, decompile .class files
from archives, etc.
"Export to HTML" (31 day evaluation period) tool added.
"View" -> "Class Version Info", "Access Flag", "Fields" and "Clipboard" menuitems added.
"Edit" -> "Insert JAVADOC TAGS" menuitem added.
New features in "Settings" - "Configurations". "Auto indent mode" option added.
Changes in DJ icon in the system tray.
New decompiler options added. "Output original line numbers as comments" option added.
Many new features in "Compile" and "Run" forms added.
DJ Java Decompiler is useful for recovery of lost or accidentally destroyed source code.
Decompiling Java is an excellent way of learning both Java and how the Java VM works.
DJ Java Decompiler makes it easy to peek into Java classes and learn from the source.
Its easy to use and intuitive graphic user interface eases the learning curve for new starters in Java.
Fixing and debugging .class files. Use DJ Java Decompiler when developers are slow
to respond to questions that need immediate answers.
DJ Java Decompiler is useful for exploring the sources of Java runtime libraries.
Like the possibility to inline bytecode.
To check the results of your obfuscation;)
Please sign the before leaving!
Known bugs:
When user opens and decompiles a class file, DJ Java Decompiler creates a temporary file with .jad extension. By default the output folder is the folder of the class file. .
The most common problem with DJ Java Decompiler is when the user doesn't have write privileges on this output folder (for example from CD or DVD drives; or from Program Files folder on Windows Vista). To solve this user can select another output location for .jad files from "Settings" - "Configuration" - "General" tab - un-check "Use Default Output Directory for .JAD files" - "Select Output Directory for .JAD files". User needs to change the output location of .jad files when working on slow media (floppy disks, tapes, external devices) or on network drives.
Doing development in both eclipse and having an instance of DJ Java Decompiler can lock
the Windows clipboard, preventing DJ from accessing the clipboard data. This then pops up
an exception dialog ("Cannot open clipboard."). This same strange behavior noticed when
executing a CTRL+C action or CTRL+X. It seems however to be a bug in combination with eclipse.
But this bug doesn't occur under Windows 95 and 98. It's look like in eclipse the standard
java clipboard solution is not used. I can't find however what might cause the problem.
Dann 's bug report: "...I have been running DJ on Windows XP Professional.
If DJ has been open a while, ErrorMessages ("Cannot open clipboard.") start to be generated
over and over again, with several minutes interval...
I'm working in Eclipse, amongst other things...
I do CUT and PASTE a lot while DJ is open in the
background..." - I don't have any idea about Eclipse and why this occurs!
And I don't know which application locks the Windows clipboard,
preventing DJ from accessing the clipboard data.
If you have any assumption or hypothesis please mail to: at_neshkov@yahoo.com !
The problem with "Undo" still exists.
Debashish Chakrabarty (Indore, India) found the following problem: The DJ editor is based on RichEdit 1.0 (riched32.dll).
If you have Visual Studio or VB installed on your computer, you may need to place the original riched32.dll in your DJ application folder - C:\Program Files\decomp\ because Visual Studio or VB can shuffle the riched32.dll s.
new version: Download version 3.10.10.93 from
Download.com
