I clone the Flink git repository, master branch, I configure a Java 8 JDK, and I can build the flink project successfully with:
mvn clean package -DskipTests However, when I load the project into IntelliJ, and try to compile the project and run the Scala tests in the IDE I get a lot of compilation errors with the existing Scala code like: ./flink/flink-scala/src/test/scala/org/apache/flink/api/scala/DeltaIterationSanityCheckTest.scala:33:41 could not find implicit value for evidence parameter of type org.apache.flink.api.common.typeinfo.TypeInformation[(Int, String)] val solutionInput = env.fromElements((1, "1")) and ./flink/flink-table/flink-table-api-scala/src/test/scala/org/apache/flink/table/types/extraction/DataTypeExtractorScalaTest.scala:39:7 overloaded method value assertThatThrownBy with alternatives: (x$1: org.assertj.core.api.ThrowableAssert.ThrowingCallable,x$2: String,x$3: Object*)org.assertj.core.api.AbstractThrowableAssert[_, _ <: Throwable] <and> (x$1: org.assertj.core.api.ThrowableAssert.ThrowingCallable)org.assertj.core.api.AbstractThrowableAssert[_, _ <: Throwable] cannot be applied to (() => Unit) assertThatThrownBy(() => runExtraction(testSpec)) Clearly, the same code is compiling when using the Maven build via command line, so this must be some kind of environment/config issue. I'd to get the code building within IntelliJ so I can use the debugger and step through unit tests. I don't want to make source changes quite yet. I'd like to just step through the code as it is. My first guess is the IntelliJ IDE is using the wrong version of the Scala compiler. In IntelliJ, in "Project Structure" -> "Platform Settings" -> "Global Libraries", I have "scala-sdk-2.12.7" configured and nothing else. I believe that's the specific version of Scala that the Flink code is intended to compile with. I've checked all the project settings and preferences and I don't see any other places I can configure or even verify which version of Scala is being used. Additional points: - I can run/debug Java unit tests via the IntelliJ IDE, but not Scala unit tests. - If I do "Build" -> "Rebuild Project", I get Scala compilation errors as mentioned above, but no Java errors. The Java code seems to compile successfully. - I'm using the current version of IntelliJ 2023.1.1 Ultimate with the Scala plugin installed. - I've read and followed the instructions on https://nightlies.apache.org/flink/flink-docs-master/docs/flinkdev/ide_setup/. These docs don't mention specifying the version of the Scala compiler at all. - This is a clean repo on "master" branch with absolutely zero changes. - In IntelliJ, in "Project Structure" -> "Project Settings" -> "Project", I've chosen a Java 8 JDK, which I presume is the best choice for building Flink code today Thanks for any help!
