[AVRO-790] Java: GenericDatumReader can fail when reusing objects with unions containing 'bytes' fields

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.5.1
• Component/s: java
• Assignee: Scott Carey
• Reporter: Scott Carey
• Created: 29/Mar/11 22:22
• Updated: 06/May/11 19:13
• Resolved: 18/Apr/11 23:13

Description

GenericDatumReader can fail when reusing GenericRecord objects that contain unions of 'bytes' and other types.

Enhanced unit tests in TestSchema.java uncovered this.

Errors are of the form:

java.lang.ClassCastException: org.apache.avro.generic.GenericData$Array cannot be cast to java.nio.ByteBuffer
	at org.apache.avro.generic.GenericDatumReader.readBytes(GenericDatumReader.java:333)
	at org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:145)
	at org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:142)
	at org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:129)