Why is My Swing GUI Rendering Incorrectly in JDK 1.8, but Not in JDK 1.7?

Swing Rendering Troubles in JDK 1.8

A user encountered a peculiar issue where the rendering of a Swing GUI appeared faulty in JDK 1.8. This malfunction was not evident in JDK 1.7.

Manifestations of the Bug

• Font Distortion: Text displayed in components like buttons and text areas exhibited distorted rendering in JDK 1.8.
• Button Text Loss: The text on buttons vanished when the mouse cursor hovered over them.

Troubleshooting Endeavors

The user attempted various fixes, including:

• Updating graphics and chipset drivers.
• Running the application from the Event Dispatch Thread (EDT).

However, the problem persisted.

Solution: Disabling Direct3D Usage

Eventually, it was discovered that setting the global environment variable "J2D_D3D" to "false" resolved the issue. This variable disables Java 2D's use of Direct3D, a graphics acceleration technology.

How to Set the Environment Variable

To create the environment variable:

1. Right-click on the "Start" menu or press Windows Key X.
2. Select "System."
3. Click on "Advanced system settings."
4. Under the "Advanced" tab, click on "Environment Variables."
5. In the "User variables" section, create a new variable named "J2D_D3D" with a value of "false."

Conclusion

Setting "J2D_D3D" to "false" effectively fixes the Swing rendering issues experienced in JDK 1.8. This solution can be particularly helpful for developers who encounter similar problems with Swing GUIs in the future.

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