Better look up of the compiler jar file.

modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/internal/KotlinJarFiles.kt

@@ -0,0 +1,21 @@
+package com.beust.kobalt.internal
+
+import com.beust.kobalt.maven.DependencyManager
+import com.google.inject.Inject
+import java.io.File
+
+/**
+ * The jar files that Kotlin needs to run.
+ */
+class KotlinJarFiles @Inject constructor(val dependencyManager: DependencyManager,
+        val settings: KobaltSettings){
+    private fun getKotlinCompilerJar(name: String): File {
+        val id = "org.jetbrains.kotlin:kotlin-$name:${settings.kobaltCompilerVersion}"
+        val dep = dependencyManager.create(id)
+        return dep.jarFile.get().absoluteFile
+    }
+
+    val stdlib: File get() = getKotlinCompilerJar("stdlib")
+    val runtime: File get() = getKotlinCompilerJar("runtime")
+    val compiler: File get() = getKotlinCompilerJar("compiler-embeddable")
+}

src/main/kotlin/com/beust/kobalt/plugin/kotlin/KotlinCompiler.kt

@@ -5,6 +5,7 @@ import com.beust.kobalt.api.*
 import com.beust.kobalt.internal.ICompilerAction
 import com.beust.kobalt.internal.JvmCompiler
 import com.beust.kobalt.internal.KobaltSettings
+import com.beust.kobalt.internal.KotlinJarFiles
 import com.beust.kobalt.kotlin.ParentLastClassLoader
 import com.beust.kobalt.maven.DependencyManager
 import com.beust.kobalt.maven.dependency.FileDependency
@@ -34,7 +35,8 @@ class KotlinCompiler @Inject constructor(
         val dependencyManager: DependencyManager,
         val executors: KobaltExecutors,
         val settings: KobaltSettings,
-        val jvmCompiler: JvmCompiler) {
+        val jvmCompiler: JvmCompiler,
+        val kotlinJarFiles: KotlinJarFiles) {
 
     val compilerAction = object: ICompilerAction {
         override fun compile(projectName: String?, info: CompilerActionInfo): TaskResult {
@@ -88,7 +90,9 @@ class KotlinCompiler @Inject constructor(
             log(2, "Calling kotlinc " + allArgs.joinToString(" "))
             val result : TaskResult =
                     if (true) {
-                        val classLoader = ParentLastClassLoader(cp.map { it.toURI().toURL() })
+                        val compilerJar = listOf(kotlinJarFiles.compiler.toURI().toURL())
+
+                        val classLoader = ParentLastClassLoader(compilerJar)
                         val compiler = classLoader.loadClass("org.jetbrains.kotlin.cli.common.CLICompiler")
                         val compilerMain = compiler.declaredMethods.filter {
                             it.name == "doMainNoExit" && it.parameterTypes.size == 2

src/main/kotlin/com/beust/kobalt/plugin/kotlin/KotlinPlugin.kt

@@ -7,6 +7,7 @@ import com.beust.kobalt.api.annotation.Directive
 import com.beust.kobalt.internal.BaseJvmPlugin
 import com.beust.kobalt.internal.JvmCompilerPlugin
 import com.beust.kobalt.internal.KobaltSettings
+import com.beust.kobalt.internal.KotlinJarFiles
 import com.beust.kobalt.maven.DependencyManager
 import com.beust.kobalt.maven.dependency.FileDependency
 import com.beust.kobalt.misc.KFiles
@@ -19,7 +20,8 @@ import javax.inject.Singleton
 
 @Singleton
 class KotlinPlugin @Inject constructor(val executors: KobaltExecutors, val dependencyManager: DependencyManager,
-        val settings: KobaltSettings, override val configActor: ConfigActor<KotlinConfig>)
+        val settings: KobaltSettings, override val configActor: ConfigActor<KotlinConfig>,
+        val kotlinJarFiles: KotlinJarFiles)
     : BaseJvmPlugin<KotlinConfig>(configActor), IDocContributor, IClasspathContributor, ICompilerContributor, IBuildConfigContributor {
 
     companion object {
@@ -105,8 +107,8 @@ class KotlinPlugin @Inject constructor(val executors: KobaltExecutors, val depen
     override fun classpathEntriesFor(project: Project?, context: KobaltContext): List<IClasspathDependency> =
         if (project == null || accept(project)) {
             // All Kotlin projects automatically get the Kotlin runtime added to their class path
-            listOf(getKotlinCompilerJar("kotlin-stdlib"), getKotlinCompilerJar("kotlin-runtime"))
+            listOf(kotlinJarFiles.stdlib, kotlinJarFiles.runtime)
-                    .map { FileDependency(it) }
+                    .map { FileDependency(it.absolutePath) }
         } else {
             emptyList()
         }