Table of Contents generated with DocToc

Issue

Project Info

  • Java 11 
    ❯ java -version
openjdk version "11.0.2" 2019-01-15
OpenJDK Runtime Environment 18.9 (build 11.0.2+9)
OpenJDK 64-Bit Server VM 18.9 (build 11.0.2+9, mixed mode)
  • Maven 3.6.3 
    ❯ mvn -version
Apache Maven 3.6.3 (cecedd343002696d0abb50b32b541b8a6ba2883f)
  • Maven compiler plugin 3.8.1 ```xml
org.apache.maven.plugins maven-compiler-plugin 3.8.1 compile compile 11 
* Scala maven plugin
```xml
<plugin>
    <groupId>net.alchim31.maven</groupId>
    <artifactId>scala-maven-plugin</artifactId>
    <version>4.4.0</version>
    <executions>
        <execution>
            <id>scala-compile-first</id>
            <phase>process-resources</phase>
            <goals>
                <goal>add-source</goal>
                <goal>compile</goal>
            </goals>
        </execution>
        <execution>
            <id>scala-test-compile</id>
            <phase>process-test-resources</phase>
            <goals>
                <goal>testCompile</goal>
            </goals>
        </execution>
    </executions>
    <configuration>
        <scalaVersion>2.13.2</scalaVersion>
    </configuration>
</plugin>

Error Stacktrace

[ERROR] : error while loading Object, Missing dependency 'class scala.native in compiler mirror', required by /modules/java.base/java/lang/Object.class
[ERROR] ## Exception when compiling 155 sources to /Users/anuragkapur/tech-stuff/workspace/ak/algorithmic-programming/target/classes
scala.reflect.internal.MissingRequirementError: object scala.runtime in compiler mirror not found.

[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  5.178 s
[INFO] Finished at: 2020-05-30T01:26:10+01:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal net.alchim31.maven:scala-maven-plugin:4.4.0:compile (scala-compile-first) on project algorithmic-programming: wrap: scala.reflect.internal.MissingRequirementError: object scala.runtime in compiler mirror not found. -> [Help 1]

Resolution

Observation

Rolling back to Java 8 and scala-maven-plugin version 3.4.2 instead of 4.4.0 doesn’t have the same issue and the project compiles successfully. But this is not a solution as I want this to work with Java 11!

Fix

Add scala-library as a dependency, as specified in the documentation of scala-maven-plugin v4.4.0

<dependency>
    <groupId>org.scala-lang</groupId>
    <artifactId>scala-library</artifactId>
    <version>2.13.2</version>
</dependency>