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Avro, mail # user - Incorrect Json schema generated for @java_class


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avronewbie 2013-02-28, 03:18
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Doug Cutting 2013-02-28, 17:19
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Alexandre Normand 2013-02-28, 17:25
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Re: Incorrect Json schema generated for @java_class
Doug Cutting 2013-02-28, 18:04
You could get the specific compiler to emit the desired type by
modifying the method SpecificCompiler#getStringType() to take the
Schema as a parameter and, if it has a java-class attribute, return
that.  Then things should work so long as you use ReflectDatumReader
and ReflectDatumWriter.  Would that suffice?

Doug

On Thu, Feb 28, 2013 at 9:25 AM, Alexandre Normand
<[EMAIL PROTECTED]> wrote:
> Hey Doug,
> I was also wondering about something related. In reflection, we can use the
> java-class property to define the java class for stringable types. Could we
> find a way to bring some of this to the Specific generated classes so that a
> stringable type (I'm specifically thinking of BigDecimal and BigInteger)
> could be exposed as the java-class type instead of Strings? I started
> looking into this and there seem to be two possibilities, none of which I'm
> terribly excited about:
>
> 1. Use some reflection to invoke the string constructor for the
> java-class…but that seems dirty as the Specific API probably shouldn't do
> reflection, right?
> 2. Handle a very specific list of java-class types (such as BigDecimal and
> BigInteger) and have code that deals specifically with these in
> Reader/Writer.
>
> Thoughts?
> --
> Alex
>
> On Thursday, February 28, 2013 at 9:19 AM, Doug Cutting wrote:
>
> Annotation names in IDL are copied directly to schema properties with
> the same names.
>
> The bug is in the IDL documentation, which uses the annotation
> @java_class in an example, which is meaningless. The Java
> implementation requires the "java-class" schema property, so the
> annotation used should be @java-class.
>
> I filed an issue in Jira for this.
>
> https://issues.apache.org/jira/browse/AVRO-1264
>
> Doug
>
> On Wed, Feb 27, 2013 at 7:18 PM, avronewbie <[EMAIL PROTECTED]> wrote:
>
> For the IDL field:
>
> @java_class("java.util.ArrayList") array<int> arrayOfInts;
>
> the JSON schema generated by the avro-maven-plugin is
>
> {\"name\":\"arrayOfInts\",\"type\":{\"type\":\"array\",\"items\":\"int\",\"java_class\":\"java.util.ArrayList\"}}
>
> Shouldn't it be generated in JSON as java-class (with hypen instead of
> underscore) instead of java_class? Because of this reading from avro file is
> not working.
>
>
>
>
> --
> View this message in context:
> http://apache-avro.679487.n3.nabble.com/Incorrect-Json-schema-generated-for-java-class-tp4026430.html
> Sent from the Avro - Users mailing list archive at Nabble.com.
>
>
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Alexandre Normand 2013-02-28, 18:36
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Doug Cutting 2013-02-28, 21:58
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Alexandre Normand 2013-02-28, 22:08
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avronewbie 2013-02-28, 20:10
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Doug Cutting 2013-02-28, 21:51