Spring Cloud Dataflow httpclient.exactlyOneUrl error

0
votes

I am have started working with Spring Cloud Dataflow on Apache Yarn.

I have created a stream which will send GET request to a REST API and send the response to a kafka broker.

In Yarn application log, I am seeing the below error:

*************************** APPLICATION FAILED TO START

Description:

Binding to target org.springframework.cloud.stream.app.httpclient.processor.HttpclientProcessorProperties@18317edc failed:

Property: httpclient.exactlyOneUrl
Value: false
Reason: Exactly one of 'url' or 'urlExpression' is required

Action:

Update your application's configuration

Sample Stream:

stream create --definition "trigger --time-unit=SECONDS| httpclient --url='''http://<hostname>:8989/api/galileo?floorid=Shop%20Floor%201''' --http-method=GET  > :streamtest1" --name ingest_to_broker --deploy

Questions:

  1. Is this the correct way of getting the response in Kafka topic?

  2. Why am I getting httpclient.exactlyOneUrl error when I have already mentioned the URL?

1
springspring-cloud-dataflow

1 Answers

0
votes

It is not clear what version of the app-starters you are using. There was some chatter on this subject in the past - see spring-cloud-stream-app-starters/httpclient#3 for background.

It could be that the value that you're sending for --url is not accepted as a string. Try a simpler URL like the ones posted in the GitHub issue linked above.

Lastly, the YARN implementation of SCDF is at EOL mode. Please review the blog describing the details and the dates. We would recommend switching over to any of the other supported platform implementations.