Run the correct jar name, even if its name was changed.

Fixes https://github.com/cbeust/kobalt/issues/355

modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/archive/Archives.kt

@@ -16,6 +16,8 @@ class Archives {
     companion object {
         @ExportedProjectProperty(doc = "The name of the jar file", type = "String")
         const val JAR_NAME = "jarName"
+        @ExportedProjectProperty(doc = "The name of the a jar file with a main() method", type = "String")
+        const val JAR_NAME_WITH_MAIN_CLASS = "jarNameWithMainClass"
 
         private val DEFAULT_STREAM_FACTORY = { os : OutputStream -> ZipOutputStream(os) }
 

src/main/kotlin/com/beust/kobalt/plugin/application/ApplicationPlugin.kt

@@ -8,7 +8,10 @@ import com.beust.kobalt.archive.Archives
 import com.beust.kobalt.internal.ActorUtils
 import com.beust.kobalt.maven.DependencyManager
 import com.beust.kobalt.maven.aether.Scope
-import com.beust.kobalt.misc.*
+import com.beust.kobalt.misc.KFiles
+import com.beust.kobalt.misc.KobaltExecutors
+import com.beust.kobalt.misc.RunCommand
+import com.beust.kobalt.misc.kobaltLog
 import com.beust.kobalt.plugin.packaging.PackageConfig
 import com.beust.kobalt.plugin.packaging.PackagingPlugin
 import com.google.inject.Inject
@@ -97,7 +100,9 @@ class ApplicationPlugin @Inject constructor(val configActor: ConfigActor<Applica
     }
 
     private fun runJarFile(project: Project, context: KobaltContext, config: ApplicationConfig) : TaskResult {
-        val fileName = project.projectProperties.get(Archives.JAR_NAME) as String
+        val fileName = project.projectProperties.get(Archives.JAR_NAME_WITH_MAIN_CLASS)?.toString()
+            ?: throw KobaltException("Couldn't find any jar file with a main class in it")
+
         val jarFileName = KFiles.joinDir(KFiles.libsDir(project), fileName)
         val jarName = (jarFileName ?: KFiles.joinDir(KFiles.libsDir(project),
                 context.variant.archiveName(project, null, ".jar")))

src/main/kotlin/com/beust/kobalt/plugin/packaging/PackagingPlugin.kt

@@ -80,7 +80,15 @@ class PackagingPlugin @Inject constructor(val dependencyManager : DependencyMana
                 //
                 val allIncludedFiles = arrayListOf<IncludedFile>()
                 val outputFiles = arrayListOf<File>()
+                val jarsWithMainClass = arrayListOf<String>()
+
                 allConfigs.forEach { packageConfig ->
+                    packageConfig.jars.forEach {
+                        if (it.attributes.any{ it.first == "Main-Class"}) {
+                            jarsWithMainClass.add(it.name)
+                        }
+                    }
+
                     listOf(packageConfig.jars, packageConfig.wars, packageConfig.zips).forEach { archives ->
                         archives.forEach {
                             val files = jarGenerator.findIncludedFiles(packageConfig.project, context, it)
@@ -92,6 +100,12 @@ class PackagingPlugin @Inject constructor(val dependencyManager : DependencyMana
                     }
                 }
 
+                if (jarsWithMainClass.any()) {
+                    project.projectProperties.put(Archives.JAR_NAME_WITH_MAIN_CLASS, jarsWithMainClass[0])
+                }
+                project.projectProperties.put(Archives.JAR_NAME,
+                        context.variant.archiveName(project, null, ".jar"))
+
                 // Turn the IncludedFiles into actual Files
                 val inputFiles = allIncludedFiles.fold(arrayListOf<File>()) { files, includedFile: IncludedFile ->
                     val foundFiles = includedFile.allFromFiles(project.directory)
@@ -119,9 +133,6 @@ class PackagingPlugin @Inject constructor(val dependencyManager : DependencyMana
                 { -> outMd5 },
                 { project ->
                     try {
-                        project.projectProperties.put(Archives.JAR_NAME,
-                                context.variant.archiveName(project, null, ".jar"))
-
                         fun findFiles(ff: ArchiveGenerator, zip: Zip) : List<IncludedFile> {
                             val archiveName = ff.fullArchiveName(project, context, zip.name).name
                             return zipToFiles[archiveName]!!