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I have an FMX self-service application designed to run on kiosks/tablets with printers and scanners. The application already works on various device models by integrating with their respective AAR/JAR libraries provided by the manufacturers (extracting the .jar files and generating the JNI interface using java2op). This past month, I have been working on integrating two devices sent by a new manufacturer: the Mini Kiosk Model and the Plus Kiosk Model. According to the manufacturer, the same AAR and method calls are used for both devices. On the Mini Kiosk, I was able to make everything work without any issues. However, on the Plus Kiosk, which should work the same way, Delphi returns the following error: java.lang.NullPointerException: Attempt to invoke virtual method 'java.util.HashMap android.hardware.usb.UsbManager.getDeviceList()' on a null object reference. So i created a test project in Java that worked fine on both devices, the issue is not with the AAR itself. After talking to the manufacturer’s support, I was advised that the Plus Kiosk requires the startup-runtime-1.1.0 library (Startup Runtime initializes objects and components automatically when the application starts). I checked the manifest.xml inside the AAR and found the following declaration: <application> <provider android:name="androidx.startup.InitializationProvider" android:authorities="${applicationId}.androidx-startup" android:exported="false" tools:node="merge" > <meta-data android:name="com.e1.Comunicacao.ConUSB" android:value="androidx.startup" /> <meta-data android:name="com.e1.Pagamento.Brigde.ConfigFileInitializer" android:value="androidx.startup" /> </provider> </application> This explains the "null object reference" error, as the UsbManager class is not being initialized properly. However, as far as I understand, Delphi already includes this library internally. So I am looking for suggestions on how I can try to solve this issue: Is there a way to check if startup-runtime is correctly interacting with the manufacturer's libraries? Do I need to regenerate the JNI interface, adding startup-runtime to it? (I’m going to try this now, but I don’t see much sense in doing so.) Can someone please help me? I've already spent several days trying to understand and fix this error.