To check if the extension is not working properly, open UIExplorer and try to select controls inside a Java app. If the entire window is selected, it means that the extension is not working properly.
If you can select controls, but their selectors look like
instead of , then the extension is not working properly.
Note: UiPath is compatible only with Java Swing and AWT apps. To detect the type of your Java application, check the cls attribute (window class name) in UiExplorer. The class name should be similar to SunAwtFrame. A faulty class name resembles GlassWndClass-GlassWindowClass-3.
You can also verify if the extension files have been properly installed:
Using Notepad, open accessibility.properties, which is located in the C:\Program Files (x86)\Java\jre1.8.0_65\lib folder. If the extension is properly installed, the file should contain assistive_technologies=UiPathV8.UiPathBridge
In the C:\Program Files (x86)\Java\jre1.8.0_65\lib\ext folder, you should find UiPathV8.jar and jaccess-1_4.jar.
In the C:\Program Files (x86)\Java\jre1.8.0_65\bin folder, you should find UiPathJavaBridgeV8.dll or UiPathJavaBridgeV8_x64.dll.
Note: If any of the previous requirements are not met, you can try to reinstall the extension as explained above, or fix them manually.
Documents are well updated now on so you can find information there as much I guess