[AVRO-1020] Builder API fails to substitute default values for enum types

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.6.1
• Fix Version/s: 1.6.2
• Component/s: java
• Assignee: Doug Cutting
• Reporter: James Baldassari
• Created: 07/Feb/12 06:50
• Updated: 15/Feb/12 00:46
• Resolved: 07/Feb/12 22:15

Description

If a schema has an enum type with a default value, and the Builder API is used to automatically substitute the default value on build(), a ClassCastException is thrown. The reason is that the default value resolves to a GenericData.EnumSymbol. The specific builder then attempts to cast this value to the corresponding Java enum type, which fails. Here is an example stack trace:

org.apache.avro.AvroRuntimeException: java.lang.ClassCastException: org.apache.avro.generic.GenericData$EnumSymbol cannot be cast to org.apache.avro.ipc.specific.PrivacyType
	at org.apache.avro.ipc.specific.Person$Builder.build(Person.java:410)
	at org.apache.avro.specific.TestSpecificRecordBuilder.testSpecificBuilder(TestSpecificRecordBuilder.java:51)
Caused by: java.lang.ClassCastException: org.apache.avro.generic.GenericData$EnumSymbol cannot be cast to org.apache.avro.ipc.specific.PrivacyType
	at org.apache.avro.ipc.specific.Person$Builder.build(Person.java:407)
	... 24 more