Message is either too detailed or not detailed enough.

Example Message:

Internal Server Error with Error during GET operation to AAI with message = java.net.NoRouteToHostException: No route to host

Message provides low level implementation details (JAVA exception class) but does not provide additional details that will help put the error in the proper context (details about the request that failed may be).  

If the intent is to provide more user friendly message we should not refer to implementation details and the reason for the error must be clearly stated. 

Simply explain that context builder failed while collecting service instance data because it was unable to establish connection to AAI.