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executeScript not working

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I am trying to run an ExecuteScript that should be taking in a json message and parsing the fields for further processing but I cannot get this to work. I ran a tester for ExecuteScript created by this author:

https://funnifi.blogspot.com/2016/06/testing-executescript-processor-scripts.html

And it returned the following error:

cannot create an instance from the abstract interface org.apache.nifi.processor.io.StreamCallback

I do not see the error in the script so could someone please assist with this:

    flowFile = session.get();

    if (flowFile != null) {

    var StreamCallback = Java.type("org.apache.nifi.processor.io.StreamCallback");
    var IOUtils = Java.type("org.apache.commons.io.IOUtils");
    var StandardCharsets = Java.type("java.nio.charset.StandardCharsets");
    var transformed_message = {};

    var error = false;
    var line = "ops_track";

    // Get attributes


    flowFile = session.write(flowFile, new StreamCallback(function (inputStream, outputStream) {


        // Read input FlowFile content


        var content = IOUtils.toString(inputStream, StandardCharsets.UTF_8); // message or content


        var message_content = {};


        try {


            message_content = JSON.parse(content);


            transformed_message.postID = (((message_content || {}).postID || "null"));


            transformed_message.contentType = (((message_content || {}).contentType || "null"));


               


                                    transformed_message.published = (((message_content || {}).published || "null"));


            transformed_message.crawled = (((message_content || {}).crawled || "null"));


            transformed_message.providerID = (((message_content || {}).providerID || "null"));


         


                                    line = line + " " + "postID=" + transformed_message.postID + ","


                     + "contentType=" + transformed_message.contentType + ","


                     + "published=" + transformed_message.published + ","


                     + "crawled=" + transformed_message.crawled + ","


                     + "providerID=" + transformed_message.providerID + ","


                                                                                + " value=" + "1" + " "


                     + time * 1000000 + "\n";


        


                               


            // Write output content


             if (transformed_message) {


                outputStream.write(line.getBytes(StandardCharsets.UTF_8));


            }


        } catch (e) {


            error = true;


            outputStream.write(content.getBytes(StandardCharsets.UTF_8));


        }


    }));


 


 


    if (error) {


        session.transfer(flowFile, REL_FAILURE)


    } else {


        session.transfer(flowFile, REL_SUCCESS)


    }


}
1 REPLY 1

@Zach

This is how I was able to get through my ExecuteScript project:

https://community.hortonworks.com/content/kbentry/75032/executescript-cookbook-part-1.html

Everything you need to know and more is included in that 3 part series.

My other advice is to create and test your script directly in command line. Then start to work with it in the context of ExecuteScript. While working with the NiFi Processor you should also be tailing the nifi log file(s) as they will possibly contain more information than you see in the NiFI UI errors.

If this answer helps, please choose ACCEPT!

; ;