diff --git a/src/main/scala/sbtassembly/Plugin.scala b/src/main/scala/sbtassembly/Plugin.scala
index 51b970d3..5b62831a 100644
--- a/src/main/scala/sbtassembly/Plugin.scala
+++ b/src/main/scala/sbtassembly/Plugin.scala
@@ -249,7 +249,6 @@ object Plugin extends sbt.Plugin {
     val (libs, dirs) = classpath.map(_.data).sorted.partition(ClasspathUtilities.isArchive)
     val depLibs = dependencies.map(_.data).sorted.partition(ClasspathUtilities.isArchive)._1
     val excludedJars = ej map {_.data}
-    log.info(libs.toString)
     val libsFiltered = libs flatMap {
       case jar if excludedJars contains jar.asFile => None
       case jar if jar.asFile.getName startsWith "scala-" =>
@@ -270,6 +269,9 @@ object Plugin extends sbt.Plugin {
       val hash = sha1name(dir)
       IO.write(tempDir / (hash + "_dir.dir"), dir.getCanonicalPath, IO.utf8, false)
       val dest = tempDir / (hash + "_dir")
+      if (dest.exists) {
+        IO.delete(dest)
+      }
       dest.mkdir()
       IO.copyDirectory(dir, dest)
       dest
diff --git a/src/sbt-test/sbt-assembly/caching/build.sbt b/src/sbt-test/sbt-assembly/caching/build.sbt
index 3c720b4f..7f1c8498 100644
--- a/src/sbt-test/sbt-assembly/caching/build.sbt
+++ b/src/sbt-test/sbt-assembly/caching/build.sbt
@@ -14,26 +14,22 @@ libraryDependencies += "ch.qos.logback" % "logback-classic" % "0.9.29" % "runtim
 
 assemblyCacheUnzip in assembly := true
 
-assemblyCacheOutput in assembly := false
+assemblyCacheOutput in assembly := true
 
-unmanagedJars in Compile <++= baseDirectory map { base =>
-   (base / "lib" / "compile" ** "*.jar").classpath
-}
-
-unmanagedJars in Runtime <++= baseDirectory map { base =>
-   (base / "lib" / "runtime" ** "*.jar").classpath
-}
+jarName in assembly := "foo.jar"
 
-unmanagedJars in Test <++= baseDirectory map { base =>
-   (base / "lib" / "test" ** "*.jar").classpath
+TaskKey[Seq[File]]("genresource") <<= (unmanagedResourceDirectories in Compile) map { (dirs) =>
+  val file = dirs.head / "foo.txt"
+  IO.write(file, "bye")
+  Seq(file)
 }
 
-excludedJars in assembly <<= (fullClasspath in assembly) map { cp => 
-  cp filter {_.data.getName == "compile-0.1.0.jar"}
+TaskKey[Seq[File]]("genresource2") <<= (unmanagedResourceDirectories in Compile) map { (dirs) =>
+  val file = dirs.head / "bar.txt"
+  IO.write(file, "bye")
+  Seq(file)
 }
 
-jarName in assembly := "foo.jar"
-
 TaskKey[Unit]("check") <<= (crossTarget) map { (crossTarget) =>
   val process = sbt.Process("java", Seq("-jar", (crossTarget / "foo.jar").toString))
   val out = (process!!)
@@ -41,6 +37,13 @@ TaskKey[Unit]("check") <<= (crossTarget) map { (crossTarget) =>
   ()
 }
 
+TaskKey[Unit]("checkfoo") <<= (crossTarget) map { (crossTarget) =>
+  val process = sbt.Process("java", Seq("-jar", (crossTarget / "foo.jar").toString))
+  val out = (process!!)
+  if (out.trim != "foo.txt") error("unexpected output: " + out)
+  ()
+}
+
 TaskKey[Unit]("checkhash") <<= (crossTarget, streams) map { (crossTarget, s) =>
   import java.security.MessageDigest
   val jarHash = crossTarget / "jarHash.txt"
diff --git a/src/sbt-test/sbt-assembly/caching/src/main/scala/hello.scala b/src/sbt-test/sbt-assembly/caching/src/main/scala/hello.scala
index 9decd677..5b2bde64 100644
--- a/src/sbt-test/sbt-assembly/caching/src/main/scala/hello.scala
+++ b/src/sbt-test/sbt-assembly/caching/src/main/scala/hello.scala
@@ -1,3 +1,8 @@
 object Main {
-  def main(args: Array[String]) { println("hello") }
+  def main(args: Array[String]) {
+    Option(getClass().getResource("foo.txt")) match {
+      case Some(_) => println("foo.txt")
+      case _ =>       println("hello")
+    }
+  }
 }
diff --git a/src/sbt-test/sbt-assembly/caching/test b/src/sbt-test/sbt-assembly/caching/test
index 267ccfe0..365fa4bf 100644
--- a/src/sbt-test/sbt-assembly/caching/test
+++ b/src/sbt-test/sbt-assembly/caching/test
@@ -18,3 +18,14 @@ $ newer target/scala-2.9.1/foo.jar target/scala-2.9.1/jarHash.txt
 # on disk
 > checkhash
 $ newer target/scala-2.9.1/jarHash.txt target/scala-2.9.1/foo.jar 
+
+# generate file
+> genresource
+> assembly
+> checkfoo
+
+# delete the generated file
+$ delete src/main/resources/foo.txt
+> genresource2
+> assembly
+> check