Brock Noland created AVRO-1240:
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Summary: SpecificDataumReader.next() can return a
GenericData.Record resulting in a ClassCastException
Key: AVRO-1240
URL: https://issues.apache.org/jira/browse/AVRO-1240
Project: Avro
Issue Type: Bug
Components: java
Affects Versions: 1.7.3
Reporter: Brock Noland
Assignee: Brock Noland
The following reasonable code:
{noformat}
DatumReader<Test> reader = new SpecificDatumReader<Test>(Test.class);
DataFileReader<Test> dataFileReader = new DataFileReader<Test>(file,
reader);
Test datum = null;
while(dataFileReader.hasNext()) {
datum = dataFileReader.next(datum);
System.out.println(datum);
}
{noformat}
Can result in a runtime exception:
{noformat}
$ java -cp avro-1.7.3.jar:$(hadoop classpath) org.apache.hadoop.util.RunJar
target/avro-example-1.0-jar-with-dependencies.jar Sample target/test-file
Exception in thread "main" java.lang.ClassCastException:
org.apache.avro.generic.GenericData$Record cannot be cast to Test
at Sample.main(Sample.java:27)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.hadoop.util.RunJar.main(RunJar.java:208)
{noformat}
when the jar containing the specific class (Test in my example) is loaded from
a different classloader than the avro jar itself. This occurs when run via the
hadoop jar command but could occur in web containers or other locations as well.
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