[jira] [Created] (FLINK-18223) AvroSerializer does not correctly instantiate GenericRecord

[Shang Yuanchun (Jira)]

Lorenzo Nicora created FLINK-18223:
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             Summary: AvroSerializer does not correctly instantiate GenericRecord
                 Key: FLINK-18223
                 URL: https://issues.apache.org/jira/browse/FLINK-18223
             Project: Flink
          Issue Type: Bug
          Components: Formats (JSON, Avro, Parquet, ORC, SequenceFile)
    Affects Versions: 1.10.1
            Reporter: Lorenzo Nicora


{{AvroSerializer.createInstance()}} simply calls {{InstantiationUtil.instantiate(type)}} to create a new instance, also when type is GenericRecord.

This fails with an exception, because a GenericRecord must be instantiated through {{GenericRecordBuilder}} but {{InstantiationUtil}} is not aware of it.
{code:java}
The class 'org.apache.avro.generic.GenericRecord' is not instantiable: The class is not a proper class. It is either abstract, an interface, or a primitive type.{code}
This can be proven with this test
{code:java}
@Test
public void shouldInstantiateGenericRecord() {
    org.apache.avro.Schema SCHEMA = new org.apache.avro.Schema.Parser().parse("{\"type\":\"record\",\"name\":\"Dummy\",\"namespace\":\"dummy\",\"fields\":[{\"name\":\"something\",\"type\":{\"type\":\"string\",\"avro.java.string\":\"String\"}}]}");
    AvroSerializer<GenericRecord> serializer = new AvroSerializer<>(GenericRecord.class, SCHEMA);

    serializer.createInstance();
}
{code}
 



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