Can't build project

[Tomczik76]

Hello, I'm trying to build this project but am getting the following error.

./gradlew build

> Task :s3-backed-serde:compileTestJava FAILED
/Users/ryan.tomczik/Dev/kafka-s3-backed-serde/s3-backed-serde/src/test/java/com/bakdata/kafka/S3BackedDeserializerTest.java:32: error: cannot access TestTopology
import com.bakdata.fluent_kafka_streams_tests.TestTopology;
                                             ^
  bad class file: /Users/ryan.tomczik/.gradle/caches/modules-2/files-2.1/com.bakdata.fluent-kafka-streams-tests/fluent-kafka-streams-tests/2.0.4/6884c7dff35da93f26a35cf405188cbdb009202b/fluent-kafka-streams-tests-2.0.4.jar(com/bakdata/fluent_kafka_streams_tests/TestTopology.class)
    class file has wrong version 55.0, should be 52.0
    Please remove or make sure it appears in the correct subdirectory of the classpath.

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':s3-backed-serde:compileTestJava'.
> Compilation failed; see the compiler error output for details.

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 1s
17 actionable tasks: 1 executed, 16 up-to-date

I'm not too familiar with Gradle so I'm not sure if there is something I'm missing here.

Thanks,
Ryan

[philipp94831]

Hi @Tomczik76, the project is built using Java 8. However, the dependency that is referenced is built using Java 11. I don't quite understand why it doesn't work though, because everything is built automatically in our CI https://dev.azure.com/bakdata/public/_build?definitionId=20&_a=summary. What Java and Gradle version do you use?

[Tomczik76]

Hi @philipp94831,
Thanks for getting back to me so fast. Here the versions of my environment.

./gradlew --version

------------------------------------------------------------
Gradle 5.4.1
------------------------------------------------------------

Build time:   2019-04-26 08:14:42 UTC
Revision:     261d171646b36a6a28d5a19a69676cd098a4c19d

Kotlin:       1.3.21
Groovy:       2.5.4
Ant:          Apache Ant(TM) version 1.9.13 compiled on July 10 2018
JVM:          1.8.0_262 (AdoptOpenJDK 25.262-b10)
OS:           Mac OS X 10.15.7 x86_64

[philipp94831]

Hi @Tomczik76,
mine shows

------------------------------------------------------------
Gradle 5.4.1
------------------------------------------------------------

Build time:   2019-04-26 08:14:42 UTC
Revision:     261d171646b36a6a28d5a19a69676cd098a4c19d

Kotlin:       1.3.21
Groovy:       2.5.4
Ant:          Apache Ant(TM) version 1.9.13 compiled on July 10 2018
JVM:          11.0.1 (Oracle Corporation 11.0.1+13-LTS)
OS:           Windows 10 10.0 amd64

Maybe you should try Java 11

[Tomczik76]

@philipp94831 upgrading to java 11 worked! This will be used in the context of the confluentinc/cp-kafka-connect Docker image and that is running Java 8. I will test to see if it still works compiled with java 11. I also added a PR for adding the STS assume role Credentials provider. Could you please review it? We need that credentials provider for use to authenticate with s3 at my org. Thanks again!

[philipp94831]

@Tomczik76 we also use it in a Kafka connect image with java 8. The java 11 dependency is only used for tests so that shouldn't be an issue. I will have a look at the PR