Ensured target/classes is created before compiling, since kotlin JS compiler is requires this

Author: jvskriubakken

kotlin-js-example/pom.xml

@@ -29,9 +29,27 @@
 
     <build>
         <sourceDirectory>${project.basedir}/src/main/kotlin</sourceDirectory>
-        <!--testSourceDirectory>${project.basedir}/src/test/kotlin</testSourceDirectory-->
+        <testSourceDirectory>${project.basedir}/src/test/kotlin</testSourceDirectory>
 
         <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-antrun-plugin</artifactId>
+                <executions>
+                    <execution>
+                        <id>ensure-target-classes-dir-before-kotlin-compile</id>
+                        <phase>generate-resources</phase>
+                        <goals>
+                            <goal>run</goal>
+                        </goals>
+                        <configuration>
+                            <tasks>
+                                <mkdir dir="${basedir}/target/classes" />
+                            </tasks>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
             <plugin>
                 <artifactId>kotlin-maven-plugin</artifactId>
                 <groupId>org.jetbrains.kotlin</groupId>