java.lang.reflect.UndeclaredThrowableException: null

This exception typically occurs when a method in Java's reflection API is invoked on a proxy object, but the method could not be implemented by the proxy object. The proxy object is an object that acts as an interface to another object, allowing the user to interact with the underlying object without directly accessing it.

The UndeclaredThrowableException is a checked exception that wraps around the actual exception that occurred, such as an IllegalAccessException, InvocationTargetException or NoSuchMethodException. It is thrown when a method call on the proxy object results in an exception that is not declared in the method's throws clause.

To resolve this issue, the actual exception that caused the UndeclaredThrowableException needs to be investigated and addressed. This may involve modifying the proxy object's implementation or modifying the code that is calling the method on the proxy object.