TASK/CLIENT-03001 Exception while fetching and locking

Camunda 7 Topics Discussion & Questions
1

Hi Community

We are encountering an error that occurs periodically (once a week, sometimes every other day):

logger_name=org.camunda.bpm.client, message=TASK/CLIENT-03001 Exception while fetching and locking
stackTrace=org.apache.hc.core5.http.NoHttpResponseException: <camunda_host>:<port> failed to respond
        at org.apache.hc.core5.http.impl.io.DefaultBHttpClientConnection.receiverReponseHeadere(DefaultBHtppClientConnection
        at org.apache.hc.core5.http.impl.io.HttpRequestExecutor.execute(HttpRequestExecutor.java:196)
        ...

The worker is a Spring Boot application that uses the “camunda-external-task-client” library to subscribe and consume requests from the Camunda engine. Spring Boot application has dependencies:

<dependency>
    <groupId>org.camunda.community</groupId>
    <artifactId>camunda-engine-rest-client-openapi-springboot</artifactId>
    <version>7.23.0</version>
</dependency>

<dependency>
    <groupId>org.camunda.bpm.springboot</groupId>
    <artifactId>camunda-bpm-spring-boot-starter-external-task-client</artifactId>
    <version>7.23.0</version>
</dependency>

Full dependency tree (using: mvn dependency:tree):

camunda_engine_rest_client_7_23
camunda_engine_rest_client_7_231280×524 150 KB

application.yml:

camunda:
  bpm:
    client:
      maxTasks: 1
      base-url: <camunda host>/engine-rest
      async-response-timeout: 10000
      look-duration: 60000
      backoff-strategy-time: 30000

We don’t understand why this error is raised. Has anyone encountered similar errors?