SpecificData returns incorrect Class type for UNION in schema
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                 Key: AVRO-1051
                 URL: https://issues.apache.org/jira/browse/AVRO-1051
             Project: Avro
          Issue Type: Bug
          Components: java
    Affects Versions: 1.6.3
            Reporter: Hamed Asghari
         Attachments: SpecificData.java.patch

Java reflection fails to find the method invoked by the client due to incorrect 
parameter types. 

This issue arises when a message request field has a UNION type where one type 
is "null" and the other type is a primitive like "int". In this case, the class 
type returned by the {{getClass(Schema)}} method in {{SpecificData}} is {{int}} 
instead of {{java.lang.Integer}} which results in a {{NoSuchMethodException}}.

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