java.awt.HeadlessException is a runtime exception thrown when java program tries to interact with AWT (abstract window toolkit) while running in an environment without graphical display.
Causes
A headless exception can occur in a thread main if the AWT API is used in an environment without a display, keyboard or mouse. This can happen when the program runs in an xserver environment.
Steps to Solve
- Check the system requirements of your program. Is there really the need to use AWT API? If the answer is yes, proceed to step 2.
- Configure your environment to allow graphical display and input. This needs to be done before you run the program again.
- Check for your code for any references made to AWT API and make sure that's correct. For example, check for the correct import statements or use of tools.
- If a few lines of code needed to be removed, repeat step 2 and 3 again.
- Try running the program again. If you still face an error, look up the Java API documentation for help on this specific error.
FAQ
Q1: What is an causes an Headless Exception in Thread Main Java AWT?
A1: A Headless exception occurs when the program interacts with AWT in an environment without a display, keyboard, or mouse.
Q2: How can I fix this issue?
A2: First, check if your system needs to use AWT API. After that, configure the environment to allow graphical display and input. Then, check the code for any references made to AWT API. If a few lines of code need to be removed, repeat the steps again. Finally, if error persists, refer to the Java API documentation.