Incompatible because this component declares a component compatible with Java 11 and the consumer needed a component compatible with Java 10

Question

In my build.gradle file I upgraded the version of one dependency (namely: com.db:microservice-commons). After loading the gradle changes, I get the following error message:

> Build file 'C:\Projects\Container\mschmidt\mount\booking-service\standalone\build.gradle' line: 50

   > A problem occurred evaluating project ':standalone'.
   > Could not resolve all files for configuration ':standalone:runtimeClasspath'.
   > Could not resolve com.db:microservice-commons:2.4.1.
     Required by:
         project :standalone
         project :standalone > project :service
      > No matching variant of com.db:microservice-commons:2.4.1 was found. The consumer was configured to find a runtime of a library compatible with Java 10, packaged as a jar, preferably optimized for standard JVMs, and its dependencies declared externally but:
          - Variant 'apiElements' capability com.db:microservice-commons:2.4.1 declares a library, packaged as a jar, and its dependencies declared externally:
              - Incompatible because this component declares an API of a component compatible with Java 11 and the consumer needed a runtime of a component compatible with Java 10
              - Other compatible attribute:
                  - Doesn't say anything about its target Java environment (preferred optimized for standard JVMs)
          - Variant 'runtimeElements' capability com.db:microservice-commons:2.4.1 declares a runtime of a library, packaged as a jar, and its dependencies declared externally:
              - Incompatible because this component declares a component compatible with Java 11 and the consumer needed a component compatible with Java 10
              - Other compatible attribute:
                  - Doesn't say anything about its target Java environment (preferred optimized for standard JVMs)
          - Variant 'samplessources' capability com.db:microservice-commons:2.4.1:
              - Incompatible because this component declares documentation and the consumer needed a library
              - Other compatible attributes:
                  - Doesn't say anything about how its dependencies are found (required its dependencies declared externally)
                  - Doesn't say anything about its target Java environment (preferred optimized for standard JVMs)
                  - Doesn't say anything about its target Java version (required compatibility with Java 10)
                  - Doesn't say anything about its elements (required them packaged as a jar)
                  - Doesn't say anything about its usage (required a runtime)

Line 50+ of file 'C:\Projects\Container\mschmidt\mount\booking-service\standalone\build.gradle' looks as follows:

manifest {
    def manifestClasspath = configurations.runtimeClasspath.collect { it.getName() }.join(' ')
    attributes 'Archiver-Version': 'Plexus Archiver'
    attributes 'Build-Jdk': org.gradle.internal.jvm.Jvm.current()
    attributes 'Main-Class': 'com.db.service.standalone.Standalone', 'Class-Path': manifestClasspath
    }
}

I have no clue what to make of this. Project JDK and Gradle JVM are set to Java 11. This post here: The consumer was configured to find a runtime of a library compatible with Java 11, packaged as a jar, and its dependencies declared externally but: ... pertains to the same problem but didn't help me.

Any ideas what's going on here?

Answer 1

I found the problem and solved it.

I changed two lines defining the compatibility in the build.gradle file.

From:

compileOptions {
    sourceCompatibility 10
    targetCompatibility 10
}

To:

compileOptions {
    sourceCompatibility 11
    targetCompatibility 11
}