Custom FaultMessageResolver throw UndeclaredThrowableException on checked Exception

[dan-lang-droid]

When updating to spring-boot v3.4.0 (ws: v4.0.11) (also observed in v3.4.1) from 3.3.7 (ws: v4.0.8), a regression is observed when having a custom FaultMessageResolver that throw a checked exception.

To replicate:

Have a WebServiceTemplate with a custom FaultMessageResolver:

private WebServiceTemplate buildTemplate(...) {
    WebServiceTemplate webServiceTemplate = new WebServiceTemplate();
    (...)
    webServiceTemplate.setFaultMessageResolver(new CustomFaultMessageResolver());
    return webServiceTemplate;
}

Have the custom FaultMessageResolver

public class CustomFaultMessageResolver extends SoapFaultMessageResolver {
    @Override
    public void resolveFault(WebServiceMessage message) throws IOException {
        throwException(new Exception("Custom exception"));
    }

    private void throwException(Throwable exception) {
        this.<RuntimeException>throwException(exception, null);
    }

    private <T extends Throwable> void throwException(T exception, Object dummy) throws T {
        throw (T) exception;
    }
}

And the WebServiceTemplate operation invokation, server side should return a fault

public void doOperation() throws Exception {
    ExampleOperationRequest request = new ExampleOperationRequest();
    ExampleOperationResponse response = (ExampleOperationResponse)webServiceTemplate.marshalSendAndReceive(request);
}

Let me know if any further information is required.

Thank you for the help