[jira] [Created] (HADOOP-8104) Inconsistent Jackson versions

["Colin Patrick McCabe (Created) (JIRA)" <ji...@apache.org>]

Inconsistent Jackson versions
-----------------------------

                 Key: HADOOP-8104
                 URL: https://issues.apache.org/jira/browse/HADOOP-8104
             Project: Hadoop Common
          Issue Type: Bug
            Reporter: Colin Patrick McCabe
            Assignee: Colin Patrick McCabe


This is a maven build issue.

Jersey 1.8 is pulling in version 1.7.1 of Jackson.  Meanwhile, we are manually specifying that we want version 1.8 of Jackson in the POM files.  This causes a conflict where Jackson produces unexpected results when serializing Map objects.

How to reproduce: try this code:
<code>
ObjectMapper mapper = new ObjectMapper();
 Map<String, Object> m = new HashMap<String, Object>();
mapper.writeValue(new File("foo"), m);
</code>

You will get an exception:
<code>
Exception in thread "main" java.lang.NoSuchMethodError: org.codehaus.jackson.type.JavaType.isMapLikeType()Z
at org.codehaus.jackson.map.ser.BasicSerializerFactory.buildContainerSerializer(BasicSerializerFactory.java:396)
at org.codehaus.jackson.map.ser.BeanSerializerFactory.createSerializer(BeanSerializerFactory.java:267)
</code>

Basically the inconsistent versions of various Jackson components are causing this NoSuchMethod error.

As far as I know, this only occurs when serializing maps-- that's why it hasn't been found and fixed yet.

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