Please Note This forum exists for community support for the Mango product family and the Radix IoT Platform. Although Radix IoT employees participate in this forum from time to time, there is no guarantee of a response to anything posted here, nor can Radix IoT, LLC guarantee the accuracy of any information expressed or conveyed. Specific project questions from customers with active support contracts are asked to send requests to support@radixiot.com.

@anmont You are not wrong, it probably should have said that. It does say we recommend JDK 8 on the store's download page, but it doesn't say the others wouldn't have worked. However, we are actively addressing compatibility issues. If you click the like to the known issue you will see that it's ready for testing. Mango 3.4, the beta of which is released, can be launched on Java 9 without encountering that illegal access exception. There may be lingering issues yet undiscovered, but you can definitely use Java 9 now! I haven't tested JDK 10 with it.

Nice! Glad you got it working!