Directly embedding a Java Swing JPanel into the UNO-AWT framework of LibreOffice is not supported due to fundamental incompatibilities between the two component models. Exploring alternative integration strategies, such as developing custom UNO components or running the Swing application externally while interfacing with LibreOffice, is recommended to achieve the desired functionality.
While it's possible to place a Swing JPanel into an AWT Panel due to their shared Java foundation, extending this embedding to UNO-AWT is not straightforward. The UNO-AWT framework does not provide mechanisms to host Java Swing components directly.
UNO Components: Developing custom UNO components that replicate the desired functionality of your JPanel can be a viable solution. This approach involves creating components that are fully compatible with the UNO-AWT framework, ensuring seamless integration within LibreOffice.
External Windows: Launching your Swing-based vocabulary trainer as a separate application that interacts with LibreOffice through UNO services is another alternative. This method maintains a clear separation between the Swing application and the LibreOffice interface, facilitating communication through defined UNO APIs.