Problem with Eclipse when using Java 11 and Cassandra Spring Unit possibly along with lombok and gradle

Question

So I ran into a problem with a project. Where Eclipse would say that java.util.* has an import error The package java.util is accessible from more than one module: <unnamed>, java.base

I dug around a lot it appears that for some reason no one else is really having this issue. Everyone in our office was. They have told me though that a RC version of Eclipse from 2018 I think Sept works, but that is the only one they can get it to work in. I'll try to post the real version later. So I searched a lot and then started playing with the gradle file for includes. And found that the problem only exists if I include the Cassandra-unit-spring testCompile requirement and because of that it only causes a problem on the test case side.

My assumption is that this is somehow a bug with eclipse as gradle itself has no problem with it. As well as intelij. Let me know what else I can provide here to narrow this down further.

Eclipse Build id: 20190917-1200
Eclipse with Lombok Lombok v1.18.10
Gradle 5.6.4
Oracle JDK 11.0.5
tried cassadnra-unit-spring versions 3.5.0.1 - 3.11.x
Also using spring boot 2.1.3.release

Thanks.

Answer 1

I have excluded all (transitive) dependencies of cassandra-unit and re-included them one by one. Eventually, I found out that the library com.boundary:high-scale-lib, i.e., a transitive dependency included by org.apache.cassandra:cassandra-all, is responsible for the import errors.

The library is not Java 9+ ready, since it uses a java.base package name, i.e., java.util. This is not allowed. Unfortunately, you cannot exclude this transtive dependency, since it is required.

I found out that the release version of Eclipse 4.10 does not indicate errors in projects using the library. This is probably a UI bug in newer Eclipse versions, since I can compile and build my application with Gradle without any errors.

You can try this Eclipse version.

Answer 2

Thank you very much for your hard work Sincostan

So with the information you provided, if you put into your build.gradle file the inclusion of the cassandra unit test like this

  testImplementation ('org.cassandraunit:cassandra-unit-spring:3.11.2.0') {
    exclude module: 'high-scale-lib'
  }

This allowed it to work in my case. you would of course need to use your own version etc. This is with Gradle 6.3 at this time.