When there is a failure in PostgresClient the replyHandler does not get the complete Throwable, it only gets the message:

• query.cause().getMessage()

• e.getMessage()

It should get the complete Throwable:

• query.cause()

• e

That way the invoking program can better handle the different kinds of exceptions, for example to create special return codes and explanations on database constraint errors regarding unique keys or foreign keys. The complete Throwable enables the invoking program to do tests like this:

if (asyncResult.getCause() instanceof GenericDatabaseException)
and to directly access the fields of the map GenericDatabaseException.errorMessage().fields().