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From "Colin Patrick McCabe (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-8104) Inconsistent Jackson versions
Date Thu, 23 Feb 2012 01:13:48 GMT
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:
ObjectMapper mapper = new ObjectMapper();
 Map<String, Object> m = new HashMap<String, Object>();
mapper.writeValue(new File("foo"), m);

You will get an exception:
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)

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

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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