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mule - UntilSuccessful component to poll http endpoint till condition is met

Polling http endpoint, receiving JSON response, I wish to keep polling till a condition is met. I have tried <until-successful failureExpression="#[json:status != 'COMPLETED']" maxRetries="5" secondsBetweenRetries="10" synchronous="true"> but this is giving exception.

Please also let me know if there is another method for my scenario

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assign the compute value to flow variable and provide condition evaluting the corresponding flow variable.

<until-successful failureExpression="#[flowVars['testRetryCondition'] != 'COMPLETED']" maxRetries="5" secondsBetweenRetries="10" synchronous="true"> <processor-chain doc:name="Processor Chain"> <http:........./> <set-variable variableName="testRetryCondition" value="#[json:status != 'COMPLETED']" doc:name="set-invocation-status"/> </processor-chain> </until-successful>


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