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Error while executing "read database" operator in rapidminer process via jsp

Porkung021Porkung021 Member Posts: 3 Contributor I
edited November 2018 in Help

I have a Rapidminer process of classification taking the input with "Read Database" operator. The process is well executed in Rapidminer studio as well as via JAVA class in Netbeans. But when I try to call that java class via JSP, It throws following exception:
com.rapidminer.operator.UserError: The dummy operator Read Database (replacing jdbc_connectors:read_database) cannot be executed.

How can I resolve it?

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Best Answer

  • Thomas_OttThomas_Ott RapidMiner Certified Analyst, RapidMiner Certified Expert, Member Posts: 1,761 Unicorn
    Solution Accepted

    It's not finding the Read Database operator. I usually see these errors w.r.t. to extensions not being installed on RapidMiner Server. 

Answers

  • Porkung021Porkung021 Member Posts: 3 Contributor I

    I need to add the JDBC extension to the classpath. IN JSP?

  • Thomas_OttThomas_Ott RapidMiner Certified Analyst, RapidMiner Certified Expert, Member Posts: 1,761 Unicorn

    I believe you do. I'm not the Java expert but that error means it cant find the Read DB.

  • 15714493711571449371 Member Posts: 1 Learner II

    com.rapidminer.operator.UserError: The dummy operator Read Database (replacing jdbc_connectors:read_database) cannot be executed.

     

     

    java如何用rapidminer进行数据挖掘，也就是java与rapidminer之间API在哪找？谢谢

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