Fix scalaCompatVersion check, closes #732

src/it/test_scalaCompatVersion/invoker.properties

@@ -0,0 +1 @@
+invoker.goals=clean compile -e

src/it/test_scalaCompatVersion/pom.xml

@@ -0,0 +1,69 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>it.scala-maven-plugin</groupId>
+    <artifactId>test_scalaCompatVersion</artifactId>
+    <version>1.0-SNAPSHOT</version>
+    <packaging>jar</packaging>
+    <name>Test for Compatible Scala versions and error message output!</name>
+    <description>Test for Compatible Scala versions and error message output!</description>
+
+    <properties>
+        <scala.version.major>2.12</scala.version.major>
+        <scala.compat.version>${scala.version.major}</scala.compat.version>
+        <scala.version.minor>14</scala.version.minor>
+        <scala.version>${scala.version.major}.${scala.version.minor}</scala.version>
+        <spark.version>3.2.1</spark.version>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.apache.spark</groupId>
+            <artifactId>spark-sql_${scala.compat.version}</artifactId>
+            <version>${spark.version}</version>
+            <scope>provided</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <sourceDirectory>src/main/scala</sourceDirectory>
+        <testSourceDirectory>src/test/scala</testSourceDirectory>
+
+        <pluginManagement>
+            <plugins>
+                <plugin>
+                    <groupId>@project.groupId@</groupId>
+                    <artifactId>@project.artifactId@</artifactId>
+                    <version>@project.version@</version>
+                </plugin>
+            </plugins>
+        </pluginManagement>
+        <plugins>
+            <plugin>
+                <groupId>@project.groupId@</groupId>
+                <artifactId>@project.artifactId@</artifactId>
+                <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>
+            </plugin>
+        </plugins>
+    </build>
+
+</project>

src/it/test_scalaCompatVersion/src/main/scala/ScalaClass.scala

@@ -0,0 +1,6 @@
+class ScalaClass {
+
+	def abstractJavaMethod() : Unit = {
+			Console.println("Test")
+	}
+}

src/it/test_scalaCompatVersion/validate.groovy

@@ -0,0 +1,21 @@
+try {
+
+def echoString = "[WARNING] Multiple versions of scala libraries detected!"
+def logFile = new File(basedir, "build.log")
+//Look for echo string
+def found = false;
+logFile.eachLine({ line ->
+   if(line.contains(echoString)) {
+     found = true;
+   }
+});
+
+assert !found
+
+
+return true
+
+} catch(Throwable e) {
+  e.printStackTrace()
+  return false
+}

src/main/java/scala_maven_dependency/CheckScalaVersionVisitor.java

@@ -45,7 +45,7 @@ public boolean visit(DependencyNode node) {
     try {
       if (_scalaContext.hasInDistro(artifact) && artifact.getVersion() != null) {
         VersionNumber originalVersion = new VersionNumber(artifact.getVersion());
-        if (_scalaContext.version().compareTo(originalVersion)
+        if (_scalaContext.versionCompat().compareTo(originalVersion)
             != 0) { // _version can be a VersionNumberMask
           _failed = true;
         }