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From "Enis Soztutar (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-8104) Inconsistent Jackson versions
Date Thu, 23 Feb 2012 21:51:54 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8104?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13215091#comment-13215091
] 

Enis Soztutar commented on HADOOP-8104:
---------------------------------------

HADOOP-7470 tried to fix the exact same problem on hbase's site, but with Jackson 1.5.5. The
problem is that ivy in 1.0 depends on jersey master (meaning jackson won't be pulled), while
trunk maven pulls jersey's dependencies. Since we need Jackson independently of Jersey, I
think we should exclude the jackson dependency from jersey. Have you tested whether jersey
1.8 works with jackson 1.8.8. 
                
> 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
>         Attachments: HADOOP-7470.patch, HADOOP-8104.patch, dependency-tree-old.txt
>
>
> 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:
> {quote}
> ObjectMapper mapper = new ObjectMapper();
>  Map<String, Object> m = new HashMap<String, Object>();
> mapper.writeValue(new File("foo"), m);
> {quote}
> You will get an exception:
> {quote}
> 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)
> {quote}
> 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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