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From: "Stephan Ewen (JIRA)" <jira@apache.org>
To: issues@flink.incubator.apache.org
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Subject: [jira] [Created] (FLINK-1182) Bad Error Message when trying to use
 expression keys on non-POJO types
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Stephan Ewen created FLINK-1182:
-----------------------------------

             Summary: Bad Error Message when trying to use expression keys on non-POJO types
                 Key: FLINK-1182
                 URL: https://issues.apache.org/jira/browse/FLINK-1182
             Project: Flink
          Issue Type: Bug
          Components: Java API, Scala API
    Affects Versions: 0.7-incubating
            Reporter: Stephan Ewen


It says "type is not composite (but is) and goes on talking about POJO types." I think that should be fixed.

{code}
Type GenericType<flink.tutorial.pagerank.PageRank.Page> is not a composite type. Key expressions are only supported on POJO types and Tuples. A type is considered a POJO if all its fields are public, or have both getters and setters defined
	at org.apache.flink.api.java.operators.Keys$ExpressionKeys.<init>(Keys.java:249)

{code}



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