About Program

A small utility that allows you to grab/dump/take/get/steal bytecode from a running Java Virtual Machine and save it to disk.
It has a graphical interface, several output formats, compatible with JDK 1.8+, and includes a small preloader (bootstrap) to choose the Java runtime for launch, dark and light theme.

Usage

Note

Due to the nature of the application, a JDK (not a JRE) is required to run it.

If you launch the program on a JRE, bootstrap window will open and prompt you to select a JDK.

Enter the path to the JDK, for example: C:\Program Files\Java\jdk1.8.0_231
Launch button will restart application using the specified JDK.
If the launch fails, you will see the bootstrap window again.

Main frame

After successful launch, you will see a list of running Java virtual machines.
Select the target JVM, connect to it, then add classes you need to right-side panel using Add to grab button (rightmost button on left panel, or button in context menu of left panel).

Light	Dark

Class grabbing

To save the selected classes, press the Grab button (rightmost button on right panel, or in context menu of the right panel).
If the path written in text field on the right does not exist, a file selection window opens, select a .zip, .jar file, or folder. After that, you will be asked to choose output directory and output format.

Light	Dark

Note

If a file with an unsupported extension is selected, extension will be automatically changed to .jar.

There are three output formats:

• Full package: Saves each class so that its package is used as the directory path. For example, class java.util.List becomes java\util\List.class.
• Package + Class name: Saves each class using full package + classname as the file name. For example, class java.util.List becomes java.util.List.class.
• Just class name: Saves each class using only its name, provided no file with that name already exists, otherwise uses: package + class name. For example, class java.util.List becomes List.class.

After you click the Grab button, program will save classes you selected to selected output resource.

Light	Dark

After saving the classes, you can disconnect from the virtual machine using the disconnect button (second button on left panel, or button in context menu of left panel)

Other

Theme chooser

Light	Dark

Context menu

Light	Dark

Credits

jSystemThemeDetector is licensed under the Apache License 2.0, Copyright (c) 2020 Albin Coquereau. FlatLaf is licensed under the Apache License 2.0. Copyright (c) 2019-2024 FormDev Software GmbH.
Log4j is licensed under the Apache License 2.0, Copyright (c) The Apache Software Foundation.
Gson is licensed under the Apache License 2.0, Copyright (c) 2008 Google Inc.

Special thanks to @JFormDesigner for the wonderful Look & Feel (FlatLaf).
Libraries: FlatLaf, Gson, Log4j
Developer: @Artur114