java data interop tests fail

Java data file interop tests currently fail.

If you run: cd lang/java; ant interop-data-generate interop-data-test

Then the test log shows:

java.io.IOException: Incomplete Block
org.apache.avro.AvroRuntimeException: java.io.IOException: Incomplete Block
at org.apache.avro.file.DataFileStream.hasNext(DataFileStream.java:169)
at org.apache.avro.TestDataFile.readFile(TestDataFile.java:193)
at org.apache.avro.TestDataFile$InteropTest.readFiles(TestDataFile.java:238)
at org.apache.avro.TestDataFile$InteropTest.testGeneratedGeneric(TestDataFile.java:216)
Caused by: java.io.IOException: Incomplete Block
at org.apache.avro.file.DataFileStream.hasNext(DataFileStream.java:161)