Introducing JarFinder.

src/main/kotlin/com/beust/kobalt/api/JarFinder.kt

@@ -0,0 +1,24 @@
+package com.beust.kobalt.api
+
+import com.beust.kobalt.maven.DepFactory
+import com.beust.kobalt.misc.KobaltExecutors
+import java.io.File
+import java.util.concurrent.Future
+
+public class JarFinder {
+    companion object {
+        /**
+         * @return a Future for the jar file corresponding to this id.
+         */
+        fun byIdFuture(id: String) : Future<File> {
+            val executor = Kobalt.INJECTOR.getInstance(KobaltExecutors::class.java).miscExecutor
+            val depFactory = Kobalt.INJECTOR.getInstance(DepFactory::class.java)
+            return depFactory.create(id, executor).jarFile
+        }
+
+        /**
+         * @return the jar file corresponding to this id. This might cause a network call.
+         */
+        fun byId(id: String) = byIdFuture(id).get()
+    }
+}

src/main/kotlin/com/beust/kobalt/plugin/apt/AptPlugin.kt

@@ -37,9 +37,9 @@ public class AptPlugin @Inject constructor(val depFactory: DepFactory, val execu
         val result = arrayListOf<String>()
         configs[project.name]?.let { config ->
             aptDependencies.get(key = project.name)?.let { aptDependency ->
-                val dependency = depFactory.create(aptDependency, executors.miscExecutor)
+                val dependencyJarFile = JarFinder.byId(aptDependency)
                 result.add("-processorpath")
-                result.add(dependency.jarFile.get().absolutePath)
+                result.add(dependencyJarFile.absolutePath)
                 val generated = KFiles.joinAndMakeDir(project.directory, project.buildDirectory!!, config.outputDir)
                 result.add("-s")
                 result.add(generated)

src/main/kotlin/com/beust/kobalt/plugin/dokka/DokkaPlugin.kt

@@ -4,6 +4,7 @@ import com.beust.kobalt.JavaInfo
 import com.beust.kobalt.SystemProperties
 import com.beust.kobalt.TaskResult
 import com.beust.kobalt.api.ConfigPlugin
+import com.beust.kobalt.api.JarFinder
 import com.beust.kobalt.api.Kobalt
 import com.beust.kobalt.api.Project
 import com.beust.kobalt.api.annotation.Directive
@@ -40,7 +41,7 @@ class DokkaPlugin @Inject constructor(val depFactory: DepFactory) : ConfigPlugin
         val classpathString = (classpath.map { it.jarFile.get().absolutePath } +
                 listOf(buildDir))
             .joinToString(File.pathSeparator)
-        val dokkaJar = depFactory.create(DOKKA_ID, context.executors.miscExecutor).jarFile.get().absolutePath
+        val dokkaJar = JarFinder.byId(DOKKA_ID)
         if (config != null) {
             val args = listOf(
                     "-classpath", classpathString,