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https://issues.apache.org/jira/browse/MRUNIT-105?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Brock Noland updated MRUNIT-105:
--------------------------------
Fix Version/s: (was: 0.9.1)
> testJavaSerialization methods fail in Java 7 because they do not set a group
> comparator
> ---------------------------------------------------------------------------------------
>
> Key: MRUNIT-105
> URL: https://issues.apache.org/jira/browse/MRUNIT-105
> Project: MRUnit
> Issue Type: Bug
> Affects Versions: 0.9.0
> Reporter: Dave Beech
> Assignee: Jim Donofrio
> Fix For: 1.0.0
>
>
> From
> http://mail-archives.apache.org/mod_mbox/incubator-mrunit-dev/201204.mbox/%3C4F927519.2040207%40gmx.net%3E
> java.lang.ClassCastException: java.lang.Integer cannot be cast to
> org.apache.hadoop.io.WritableComparable
> at
> org.apache.hadoop.io.WritableComparator.compare(WritableComparator.java:119)
> at java.util.TreeMap.compare(TreeMap.java:1188)
> at java.util.TreeMap.put(TreeMap.java:531)
> at
> org.apache.hadoop.mrunit.MapReduceDriverBase.shuffle(MapReduceDriverBase.java:172)
> at org.apache.hadoop.mrunit.MapReduceDriver.run(MapReduceDriver.java:328)
> at
> org.apache.hadoop.mrunit.MapReduceDriverBase.runTest(MapReduceDriverBase.java:137)
> at org.apache.hadoop.mrunit.TestDriver.runTest(TestDriver.java:158)
> at
> org.apache.hadoop.mrunit.TestMapReduceDriver.testJavaSerialization(TestMapReduceDriver.java:409)
> public int compare(Object a, Object b) {
> return compare((WritableComparable)a, (WritableComparable)b);
> }
> Java 7:
> Entry<K,V> t = root;
> if (t == null) {
> compare(key, key); // type (and possibly null) check
> root = new Entry<>(key, value, null);
> size = 1;
> modCount++;
> return null;
> }
> Java 6:
> Entry<K,V> t = root;
> if (t == null) {
> // TBD:
> // 5045147: (coll) Adding null to an empty TreeSet should
> // throw NullPointerException
> //
> // compare(key, key); // type check
> root = new Entry<K,V>(key, value, null);
> size = 1;
> modCount++;
> return null;
> }
> Oops this is a bug in test case not the actual code, good catch. This
> problem is not unique to Java 7. The problem only appears in Java 7 because
> the java serialization tests only use 1 input value. Java 6's put method in
> TreeMap does not call compare when adding to an empty map while Java 7's put
> method does call compare when adding to an empty map.
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