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Thread: Problem with Merge Join and Jfreereport

  1. #1
    Join Date
    Oct 2007

    Default Problem with Merge Join and Jfreereport

    I am having a problem with merge join in Kettle 3.0.0 GA. I want to create
    a Kettle transform that will join together the result sets from two queries,
    where each query accesses a different database. I then want to feed the
    result set from the Kettle transformation into a Jfreereport.

    I have managed to successfully hook together a Kettle transform and
    Jfreereport (based on a sample in the PCI). However, when the transform
    uses a merge join, then I have problems. Specifically, the Jfreereport
    behaves as if the input fields are not present, and these error messaages
    are generated:

    [JCommon] Warning: Data-Set does not contain a column with name 'LASTNAME'
    [JCommon] Warning: Data-Set does not contain a column with name 'CITY'

    Attached is an example of the problem, which runs in the PCI. (I've tried
    it in Pentaho and with same result.) To keep things
    simple, this example merges two result sets from the same database
    (sampledata), but the same problem occurs when using two databases.

    In the attachment, the report driven by kettle_no_mergejoin.xaction gets its
    results from a Kettle transform that does not involve merge join, and it works
    correctly. The report driven by kettle_mergejoin.xaction gets its results from
    the merge join step of a Kettle transform, and produces blank output.

    Other than the transform used, the two reports are identical. Is this
    a bug or am I missing something?

    Attached Files Attached Files
    Last edited by larrybennett; 12-04-2007 at 06:57 AM. Reason: Clarify

  2. #2
    Join Date
    Oct 2007


    I've resolved this issue now. It turns out that I was using
    the Kettle 2.5.1 that is included in the Pentaho platform 1.6/1.7.
    I upgraded Kettle to 3.0.0 using the instructions at:

    Now the JfreeReport correctly gets the output of the Kettle


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