[jira] [Updated] (AVRO-1801) Generated code results in java.lang.ClassCastException

["Thiruvalluvan M. G. (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/AVRO-1801?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Thiruvalluvan M. G. updated AVRO-1801:
--------------------------------------
    Component/s: java

> Generated code results in java.lang.ClassCastException
> ------------------------------------------------------
>
>                 Key: AVRO-1801
>                 URL: https://issues.apache.org/jira/browse/AVRO-1801
>             Project: Apache Avro
>          Issue Type: Bug
>          Components: java
>    Affects Versions: 1.8.0
>            Reporter: Alex Baumgarten
>            Priority: Major
>
> Create and compile avro schema:
> {
>     "namespace": "com.abc.def.ghi.schema",
>     "type": "record",
>     "name": "MyDataRecord",
>     "fields": [
>         {"name": "Heading", "type": ["null", {"type": "fixed", "name": "short", "size": 2}]}
>     ]
> }
> which leads to compiled code:
> public void put(int field$, java.lang.Object value$) {
>   switch (field$) {
>   case 0: Heading = (com.abc.def.ghi.schema.short$)value$; break;
>   default: throw new org.apache.avro.AvroRuntimeException("Bad index");
>   }
> }
> When this function is called the type of value is org.apache.avro.generic.GenericData$Fixed and when it tries to cast to the short$ type it throws a java.lang.ClassCastException.
> This occurs when running the following code:
> SpecificDatumReader<MyDataRecord> datumReader = new SpecificDatumReader<>(MyDataRecord.class);
> DataFileReader<MyDataRecord> dataFileReader = new DataFileReader<>(new FsInput(inputAvroPath, configuration), datumReader);
> for (MyDataRecord record : dataFileReader) {
>     // Do something with record
> }
> If I manually modify the generated code to extract the bytes from value$ and call the constructor of short$ it works as expected. But this is not what is generated.



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