[jira] [Created] (SYSTEMML-901) Improve message if MLContext SparkContext not available

["Deron Eriksson (JIRA)" <ji...@apache.org>]

Deron Eriksson created SYSTEMML-901:
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             Summary: Improve message if MLContext SparkContext not available
                 Key: SYSTEMML-901
                 URL: https://issues.apache.org/jira/browse/SYSTEMML-901
             Project: SystemML
          Issue Type: Improvement
          Components: APIs
            Reporter: Deron Eriksson
            Assignee: Deron Eriksson


Currently, if an MLContext object hasn't been created with the SparkContext, this can give rise to an error such as the following:
{code}
java.lang.NullPointerException
at org.apache.sysml.api.mlcontext.MLContextConversionUtil.determineDataFrameDimensionsIfNeeded(MLContextConversionUtil.java:610)
{code}

For instance, if the MLContext object hasn't been created yet but a user does something such as trying to set inputs and outputs on a Script object, the above error occurs.
{code}
val LinRegCg = LinRegCgDML.in("X", X).in("y", y).out("beta_out")
{code}

The error message should be more informative and tell the user how to fix the issue.




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