Brock Noland created AVRO-1240: ---------------------------------- 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. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira