diff --git a/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/ArchiveFileFinder.kt b/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/ArchiveFileFinder.kt
new file mode 100644
index 00000000..6cddba35
--- /dev/null
+++ b/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/ArchiveFileFinder.kt
@@ -0,0 +1,11 @@
+package com.beust.kobalt.plugin.packaging
+
+import com.beust.kobalt.api.KobaltContext
+import com.beust.kobalt.api.Project
+import com.beust.kobalt.archive.Zip
+import com.beust.kobalt.misc.IncludedFile
+
+interface ArchiveFileFinder {
+    fun findIncludedFiles(project: Project, context: KobaltContext, zip: Zip) : List<IncludedFile>
+}
+
diff --git a/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/JarGenerator.kt b/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/JarGenerator.kt
index aeef361c..e2383e50 100644
--- a/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/JarGenerator.kt
+++ b/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/JarGenerator.kt
@@ -4,9 +4,11 @@ import com.beust.kobalt.api.KobaltContext
 import com.beust.kobalt.api.Project
 import com.beust.kobalt.archive.Archives
 import com.beust.kobalt.archive.Jar
+import com.beust.kobalt.archive.Zip
 import com.beust.kobalt.maven.DependencyManager
 import com.beust.kobalt.maven.aether.Scope
 import com.beust.kobalt.misc.*
+import com.beust.kobalt.plugin.packaging.ArchiveFileFinder
 import com.google.inject.Inject
 import java.io.File
 import java.io.FileInputStream
@@ -15,9 +17,10 @@ import java.nio.file.Paths
 import java.util.jar.JarOutputStream
 import java.util.jar.Manifest
 
-class JarGenerator @Inject constructor(val dependencyManager: DependencyManager) {
+class JarGenerator @Inject constructor(val dependencyManager: DependencyManager) : ArchiveFileFinder {
     companion object {
-        fun findIncludedFiles(directory: String, files: List<IncludedFile>, excludes: List<Glob>)
+        fun findIncludedFiles(directory: String, files: List<IncludedFile>, excludes: List<Glob>,
+                throwOnError: Boolean = true)
                 : List<IncludedFile> {
             val result = arrayListOf<IncludedFile>()
             files.forEach { includedFile ->
@@ -27,7 +30,7 @@ class JarGenerator @Inject constructor(val dependencyManager: DependencyManager)
                     if (File(directory, fromPath).exists()) {
                         spec.toFiles(directory, fromPath).forEach { file ->
                             val fullFile = File(KFiles.joinDir(directory, fromPath, file.path))
-                            if (! fullFile.exists()) {
+                            if (! fullFile.exists() && throwOnError) {
                                 throw AssertionError("File should exist: $fullFile")
                             }
 
@@ -52,7 +55,7 @@ class JarGenerator @Inject constructor(val dependencyManager: DependencyManager)
         }
     }
 
-    fun findIncludedFiles(project: Project, context: KobaltContext, jar: Jar) : List<IncludedFile> {
+    override fun findIncludedFiles(project: Project, context: KobaltContext, jar: Zip) : List<IncludedFile> {
         //
         // Add all the applicable files for the current project
         //
@@ -86,7 +89,7 @@ class JarGenerator @Inject constructor(val dependencyManager: DependencyManager)
             //
             // The user specified an include, just use it verbatim
             //
-            val includedFiles = findIncludedFiles(project.directory, jar.includedFiles, jar.excludes)
+            val includedFiles = findIncludedFiles(project.directory, jar.includedFiles, jar.excludes, false)
             result.addAll(includedFiles)
         }
 
diff --git a/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/archive/Jar.kt b/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/archive/Jar.kt
index f8a47848..80a7bd1a 100644
--- a/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/archive/Jar.kt
+++ b/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/archive/Jar.kt
@@ -8,7 +8,7 @@ import com.beust.kobalt.api.annotation.Directive
  */
 open class Jar(override val project: Project,
         override var name : String = Archives.defaultArchiveName(project) + ".jar",
-        var fatJar: Boolean = false) : Zip(project, name), AttributeHolder {
+        override var fatJar: Boolean = false) : Zip(project, name, fatJar), AttributeHolder {
     @Directive
     fun manifest(init: Manifest.(p: Manifest) -> Unit) : Manifest {
         val m = Manifest(this)
diff --git a/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/archive/Zip.kt b/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/archive/Zip.kt
index 61237291..22b5809d 100644
--- a/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/archive/Zip.kt
+++ b/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/archive/Zip.kt
@@ -8,7 +8,8 @@ import com.beust.kobalt.misc.From
 import com.beust.kobalt.misc.IncludedFile
 import com.beust.kobalt.misc.To
 
-open class Zip(open val project: Project, open var name: String = Archives.defaultArchiveName(project) + ".zip") {
+open class Zip(open val project: Project, open var name: String = Archives.defaultArchiveName(project) + ".zip",
+        open var fatJar: Boolean = false) {
     val excludes = arrayListOf<Glob>()
 
     @Directive
diff --git a/src/main/kotlin/com/beust/kobalt/plugin/packaging/PackagingPlugin.kt b/src/main/kotlin/com/beust/kobalt/plugin/packaging/PackagingPlugin.kt
index 0518fed6..ba04971e 100644
--- a/src/main/kotlin/com/beust/kobalt/plugin/packaging/PackagingPlugin.kt
+++ b/src/main/kotlin/com/beust/kobalt/plugin/packaging/PackagingPlugin.kt
@@ -11,7 +11,9 @@ import com.beust.kobalt.internal.IncrementalManager
 import com.beust.kobalt.internal.JvmCompilerPlugin
 import com.beust.kobalt.internal.ParallelLogger
 import com.beust.kobalt.maven.DependencyManager
+import com.beust.kobalt.maven.Md5
 import com.beust.kobalt.maven.PomGenerator
+import com.beust.kobalt.misc.IncludedFile
 import com.beust.kobalt.misc.KFiles
 import com.beust.kobalt.misc.KobaltExecutors
 import java.io.File
@@ -68,6 +70,34 @@ class PackagingPlugin @Inject constructor(val dependencyManager : DependencyMana
      * skipped.
      */
     override fun assemble(project: Project, context: KobaltContext) : IncrementalTaskInfo {
+        val allArchivers = packages.filter { it.project.name == project.name }
+
+        if (false) {
+            // Work in progress
+            val allIncludedFiles = arrayListOf<IncludedFile>()
+            val zipToFiles = hashMapOf<String, List<IncludedFile>>()
+            allArchivers.forEach { packageConfig ->
+                listOf(packageConfig.jars, packageConfig.wars, packageConfig.zips).forEach { archives ->
+                    archives.forEach {
+                        val files = jarGenerator.findIncludedFiles(packageConfig.project, context, it)
+                        allIncludedFiles.addAll(files)
+                        zipToFiles[it.name] = files
+                    }
+                }
+            }
+            val allFiles = allIncludedFiles.fold(arrayListOf<File>()) { files, includedFile: IncludedFile ->
+                val foundFiles = includedFile.allFromFiles(project.directory)
+                val absFiles = foundFiles.map {
+                    File(KFiles.joinDir(project.directory, includedFile.from, it.path))
+                }
+                files.addAll(absFiles)
+                files
+            }
+
+            val md5 = Md5.toMd5Directories(allFiles)
+            println("MD5 is: " + md5)
+        }
+
         return IncrementalTaskInfo(
                 { null },
                 { null },
@@ -75,7 +105,7 @@ class PackagingPlugin @Inject constructor(val dependencyManager : DependencyMana
                     try {
                         project.projectProperties.put(Archives.JAR_NAME,
                                 context.variant.archiveName(project, null, ".jar"))
-                        packages.filter { it.project.name == project.name }.forEach { packageConfig ->
+                        allArchivers.forEach { packageConfig ->
                             packageConfig.jars.forEach { jarGenerator.generateJar(packageConfig.project, context, it) }
                             packageConfig.wars.forEach { warGenerator.generateWar(packageConfig.project, context, it) }
                             packageConfig.zips.forEach { zipGenerator.generateZip(packageConfig.project, context, it) }
diff --git a/src/main/kotlin/com/beust/kobalt/plugin/packaging/WarGenerator.kt b/src/main/kotlin/com/beust/kobalt/plugin/packaging/WarGenerator.kt
index 8ecafab1..1bce23eb 100644
--- a/src/main/kotlin/com/beust/kobalt/plugin/packaging/WarGenerator.kt
+++ b/src/main/kotlin/com/beust/kobalt/plugin/packaging/WarGenerator.kt
@@ -7,6 +7,7 @@ import com.beust.kobalt.api.KobaltContext
 import com.beust.kobalt.api.Project
 import com.beust.kobalt.archive.Archives
 import com.beust.kobalt.archive.War
+import com.beust.kobalt.archive.Zip
 import com.beust.kobalt.internal.ParallelLogger
 import com.beust.kobalt.maven.DependencyManager
 import com.beust.kobalt.misc.From
@@ -19,7 +20,8 @@ import java.io.OutputStream
 import java.nio.file.Paths
 import java.util.jar.JarOutputStream
 
-class WarGenerator @Inject constructor(val dependencyManager: DependencyManager, val kobaltLog: ParallelLogger) {
+class WarGenerator @Inject constructor(val dependencyManager: DependencyManager, val kobaltLog: ParallelLogger)
+    : ArchiveFileFinder {
 
     companion object {
         val WEB_INF = "WEB-INF"
@@ -27,7 +29,7 @@ class WarGenerator @Inject constructor(val dependencyManager: DependencyManager,
         val LIB = "$WEB_INF/lib"
     }
 
-    fun findIncludedFiles(project: Project, context: KobaltContext, war: War) : List<IncludedFile> {
+    override fun findIncludedFiles(project: Project, context: KobaltContext, war: Zip) : List<IncludedFile> {
         //
         // src/main/web app and classes
         //
diff --git a/src/main/kotlin/com/beust/kobalt/plugin/packaging/ZipGenerator.kt b/src/main/kotlin/com/beust/kobalt/plugin/packaging/ZipGenerator.kt
index fed784a0..4427892b 100644
--- a/src/main/kotlin/com/beust/kobalt/plugin/packaging/ZipGenerator.kt
+++ b/src/main/kotlin/com/beust/kobalt/plugin/packaging/ZipGenerator.kt
@@ -7,11 +7,17 @@ import com.beust.kobalt.archive.Archives
 import com.beust.kobalt.archive.Zip
 import com.beust.kobalt.internal.ParallelLogger
 import com.beust.kobalt.maven.DependencyManager
+import com.beust.kobalt.misc.IncludedFile
 import com.google.inject.Inject
 
-class ZipGenerator @Inject constructor(val dependencyManager: DependencyManager, val kobaltLog: ParallelLogger) {
+class ZipGenerator @Inject constructor(val dependencyManager: DependencyManager, val kobaltLog: ParallelLogger)
+    : ArchiveFileFinder {
+    override fun findIncludedFiles(project: Project, context: KobaltContext, zip: Zip): List<IncludedFile> {
+        return JarGenerator.findIncludedFiles(project.directory, zip.includedFiles, zip.excludes)
+    }
+
     fun generateZip(project: Project, context: KobaltContext, zip: Zip) {
-        val allFiles = JarGenerator.findIncludedFiles(project.directory, zip.includedFiles, zip.excludes)
+        val allFiles = findIncludedFiles(project, context, zip)
         Archives.generateArchive(project, context, zip.name, ".zip", allFiles)
     }
 }