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From Yang <teddyyyy...@gmail.com>
Subject Re: explicit schema verification?
Date Wed, 07 Sep 2011 20:59:36 GMT
let me try the builder , thanks guys

On Wed, Sep 7, 2011 at 1:59 PM, Scott Carey <scottcarey@apache.org> wrote:

> Before the SpecificRecord  Builder API, a common practice was to use
> wrapper classes and/or static helpers for your types so that users can only
> create valid objects.
> On 9/7/11 1:17 PM, "Yang" <teddyyyy123@gmail.com> wrote:
> when we declare some fields in a record, it's assumed to be mandatory
> unless we specify it with a union {original_type, null}.
> this feature is actually very useful to me: I declare a schema, and if some
> new user creates a record, but fails to populate some mandatory field, I
> want some mechanism to throw an exception.
> currently I get this feature "by accident": if the user misses some
> mandatory fields, when I send this record as a param to some RPC method, or
> when I serialize it through SpecificDatumWriter, Avro throws a
> NULLPointerException.  I can catch this and let user know that it's due to
> lack of mandatory fields.
> but instead of NPE, could we make Avro throw a more explicit exception, so
> it's more descriptive?
> Thanks
> Yang

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