Using REST Apis in Pentaho 6.0: Getting 503 Service Unavailable

Hi,

I'm evaluating Pentaho for one of the project I have. I have taken community edition 6.0 version of it. I am exploring the REST apis provided with this release. Frankly speaking, I don't find any clear documentation of any RESt api. Or may be those are not elaborated enough. I have also looked into the code. I observed that REST endpoints are registered with Jetty however, those are not working for some reason.

I have tried to access the RESt api configured with 'CarteResource'. Through Postman, I'm trying to hit [MY HOST : PORT]/api/carte/systemInfo and I'm expecting some response for this. However, I get 503:Service Unavailable.

Could anyone please help? Pls let me know if you need more information.

Thanks.
Regards, Rahul