Authentication Issue occurred while fetching the Task from the Tasklist API

[udhayakumar.k]

We are currently progressing to integrate the Camunda User Task completion from Spring Boot application. We have referred the below link for our integration.

https://docs.camunda.io/docs/apis-tools/tasklist-api-rest/tasklist-api-rest-tutorial/#generate-the-tasklist-api-client

But unfortunately, we are facing some Authentication issues.

Configurations setup in local machine:

application.properties:
camunda.client.mode=simple
camunda.client.auth.username=demo
camunda.client.auth.password=demo
camunda.client.zeebe.enabled=true
camunda.client.zeebe.gateway-url=http://localhost:26500/
camunda.client.zeebe.base-url=http://localhost:8080/
camunda.client.zeebe.prefer-rest-over-grpc=false
camunda.client.operate.enabled=true
camunda.client.operate.base-url=http://localhost:8081
camunda.client.tasklist.enabled=true
camunda.client.tasklist.base-url=http://localhost:8082/

Error:

ERROR 26824 — [demo] [ main] o.s.boot.SpringApplication : Application run failed

java.lang.RuntimeException: Unable to authenticate
at io.camunda.common.auth.SimpleAuthentication.retrieveToken(SimpleAuthentication.java:58) ~[java-common-8.5.2.jar:8.5.2]
at io.camunda.common.auth.SimpleAuthentication.getTokenHeader(SimpleAuthentication.java:79) ~[java-common-8.5.2.jar:8.5.2]
at io.camunda.common.http.DefaultHttpClient.retrieveToken(DefaultHttpClient.java:207) ~[java-common-8.5.2.jar:8.5.2]
at io.camunda.common.http.DefaultHttpClient.post(DefaultHttpClient.java:148) ~[java-common-8.5.2.jar:8.5.2]
at io.camunda.operate.CamundaOperateClient.searchProcessDefinitionResults(CamundaOperateClient.java:46) ~[java-client-operate-8.5.2.jar:8.5.2]
at io.camunda.operate.CamundaOperateClient.searchProcessDefinitions(CamundaOperateClient.java:41) ~[java-client-operate-8.5.2.jar:8.5.2]
at com.example.demo.DemoApplication.run(DemoApplication.java:44) ~[classes/:na]
at org.springframework.boot.SpringApplication.lambda$callRunner$5(SpringApplication.java:790) ~[spring-boot-3.3.0.jar:3.3.0]
at org.springframework.util.function.ThrowingConsumer$1.acceptWithException(ThrowingConsumer.java:83) ~[spring-core-6.1.8.jar:6.1.8]
at org.springframework.util.function.ThrowingConsumer.accept(ThrowingConsumer.java:60) ~[spring-core-6.1.8.jar:6.1.8]
at org.springframework.util.function.ThrowingConsumer$1.accept(ThrowingConsumer.java:88) ~[spring-core-6.1.8.jar:6.1.8]
at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:798) ~[spring-boot-3.3.0.jar:3.3.0]
at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:789) ~[spring-boot-3.3.0.jar:3.3.0]
at org.springframework.boot.SpringApplication.lambda$callRunners$3(SpringApplication.java:774) ~[spring-boot-3.3.0.jar:3.3.0]
at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) ~[na:na]
at java.base/java.util.stream.SortedOps$SizedRefSortingSink.end(SortedOps.java:357) ~[na:na]
at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:510) ~[na:na]
at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499) ~[na:na]
at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) ~[na:na]
at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) ~[na:na]
at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[na:na]
at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:596) ~[na:na]
at org.springframework.boot.SpringApplication.callRunners(SpringApplication.java:774) ~[spring-boot-3.3.0.jar:3.3.0]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:342) ~[spring-boot-3.3.0.jar:3.3.0]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1363) ~[spring-boot-3.3.0.jar:3.3.0]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1352) ~[spring-boot-3.3.0.jar:3.3.0]
at com.example.demo.DemoApplication.main(DemoApplication.java:36) ~[classes/:na]
Caused by: java.lang.RuntimeException: Unable to authenticate due to missing Set-Cookie
at io.camunda.common.auth.SimpleAuthentication.retrieveToken(SimpleAuthentication.java:53) ~[java-common-8.5.2.jar:8.5.2]
… 26 common frames omitted

Any suggestions would be helpful.

Thanks.