question: private static String buildMessage ( String reason , String description , int statusCode , DruidQuery < ? > druidQuery , Throwable cause , ObjectWriter objectWriter ) { String druidQueryString ; try { druidQueryString = objectWriter . writeValueAsString ( druidQuery ) ; } catch ( JsonProcessingException jse ) { try { druidQueryString = druidQuery . toString ( ) ; } catch ( Exception e ) { LOG . warn ( "Error invoking a druid query's toString." , e ) ; druidQueryString = "QUERY'S `toString` FAILED" ; } LOG . warn ( String . format ( "Failed to serialize druid query %s" , druidQueryString ) , jse ) ; } return String . format ( "reason: %s, description: %s, statusCode: %d, druid query: %s, cause: %s" , reason , description , statusCode , druidQueryString , cause ) ; }
target:  Builds a message for this exception that is basically a straightforward serialization of its interesting state.