Rework error handling to be more robust

src/main/kotlin/link/infra/packwiz/installer/DownloadTask.kt

@@ -8,6 +8,7 @@ import link.infra.packwiz.installer.metadata.hash.HashUtils.getHash
 import link.infra.packwiz.installer.metadata.hash.HashUtils.getHasher
 import link.infra.packwiz.installer.ui.data.ExceptionDetails
 import link.infra.packwiz.installer.ui.data.IOptionDetails
+import link.infra.packwiz.installer.util.Log
 import okio.Buffer
 import okio.HashingSink
 import okio.buffer
@@ -125,6 +126,7 @@ internal class DownloadTask private constructor(val metadata: IndexFile.File, de
 	fun download(packFolder: String, indexUri: SpaceSafeURI) {
 		if (err != null) return
 
+		// TODO: is this necessary if we overwrite?
 		// Ensure it is removed
 		cachedFile?.let {
 			if (!it.optionValue || !correctSide()) {
@@ -133,8 +135,7 @@ internal class DownloadTask private constructor(val metadata: IndexFile.File, de
 				try {
 					Files.deleteIfExists(Paths.get(packFolder, it.cachedLocation))
 				} catch (e: IOException) {
-					// TODO: how much of a problem is this? use log4j/other log library to show warning?
-					e.printStackTrace()
+					Log.warn("Failed to delete file before downloading", e)
 				}
 				it.cachedLocation = null
 			}
@@ -190,7 +191,7 @@ internal class DownloadTask private constructor(val metadata: IndexFile.File, de
 				Files.copy(data.inputStream(), destPath, StandardCopyOption.REPLACE_EXISTING)
 				data.clear()
 			} else {
-				// TODO: no more PRINTLN!!!!!!!!!
+				// TODO: move println to something visible in the error window
 				println("Invalid hash for " + metadata.destURI.toString())
 				println("Calculated: " + fileSource.hash)
 				println("Expected:   $hash")

src/main/kotlin/link/infra/packwiz/installer/Main.kt

@@ -5,6 +5,7 @@ package link.infra.packwiz.installer
 import link.infra.packwiz.installer.metadata.SpaceSafeURI
 import link.infra.packwiz.installer.ui.cli.CLIHandler
 import link.infra.packwiz.installer.ui.gui.GUIHandler
+import link.infra.packwiz.installer.util.Log
 import org.apache.commons.cli.DefaultParser
 import org.apache.commons.cli.Options
 import org.apache.commons.cli.ParseException
@@ -29,7 +30,7 @@ class Main(args: Array<String>) {
 		val cmd = try {
 			parser.parse(options, args)
 		} catch (e: ParseException) {
-			e.printStackTrace()
+			Log.fatal("Failed to parse command line arguments", e)
 			if (guiEnabled) {
 				EventQueue.invokeAndWait {
 					try {
@@ -37,7 +38,8 @@ class Main(args: Array<String>) {
 					} catch (ignored: Exception) {
 						// Ignore the exceptions, just continue using the ugly L&F
 					}
-					JOptionPane.showMessageDialog(null, e.message, "packwiz-installer", JOptionPane.ERROR_MESSAGE)
+					JOptionPane.showMessageDialog(null, "Failed to parse command line arguments: $e",
+						"packwiz-installer", JOptionPane.ERROR_MESSAGE)
 				}
 			}
 			exitProcess(1)
@@ -51,33 +53,34 @@ class Main(args: Array<String>) {
 
 		val unparsedArgs = cmd.args
 		if (unparsedArgs.size > 1) {
-			ui.handleExceptionAndExit(RuntimeException("Too many arguments specified!"))
+			ui.showErrorAndExit("Too many arguments specified!")
 		} else if (unparsedArgs.isEmpty()) {
-			ui.handleExceptionAndExit(RuntimeException("URI to install from must be specified!"))
+			ui.showErrorAndExit("pack.toml URI to install from must be specified!")
 		}
 
-		cmd.getOptionValue("title")?.also(ui::setTitle)
+		val title = cmd.getOptionValue("title")
+		if (title != null) {
+			ui.setTitle(title)
+		}
 
 		ui.show()
 
-		val uOptions = UpdateManager.Options().apply {
-			side = cmd.getOptionValue("side")?.let((UpdateManager.Options.Side)::from) ?: side
-			packFolder = cmd.getOptionValue("pack-folder") ?: packFolder
-			manifestFile = cmd.getOptionValue("meta-file") ?: manifestFile
-		}
-
-		try {
-			uOptions.downloadURI = SpaceSafeURI(unparsedArgs[0])
+		val uOptions = try {
+			UpdateManager.Options.construct(
+				downloadURI = SpaceSafeURI(unparsedArgs[0]),
+				side = cmd.getOptionValue("side")?.let((UpdateManager.Options.Side)::from),
+				packFolder = cmd.getOptionValue("pack-folder"),
+				manifestFile = cmd.getOptionValue("meta-file")
+			)
 		} catch (e: URISyntaxException) {
-			// TODO: better error message?
-			ui.handleExceptionAndExit(e)
+			ui.showErrorAndExit("Failed to read pack.toml URI", e)
 		}
 
 		// Start update process!
 		try {
 			UpdateManager(uOptions, ui)
-		} catch (e: Exception) { // TODO: better error message?
-			ui.handleExceptionAndExit(e)
+		} catch (e: Exception) {
+			ui.showErrorAndExit("Update process failed", e)
 		}
 		println("Finished successfully!")
 		ui.dispose()
@@ -111,17 +114,17 @@ class Main(args: Array<String>) {
 		try {
 			startup(args)
 		} catch (e: Exception) {
-			e.printStackTrace()
+			Log.fatal("Error from main", e)
 			if (guiEnabled) {
 				EventQueue.invokeLater {
 					JOptionPane.showMessageDialog(null,
-						"A fatal error occurred: \n" + e.javaClass.canonicalName + ": " + e.message,
+						"A fatal error occurred: \n$e",
 						"packwiz-installer", JOptionPane.ERROR_MESSAGE)
 					exitProcess(1)
 				}
+				// In case the EventQueue is broken, exit after 1 minute
+				Thread.sleep(60 * 1000.toLong())
 			}
-			// In case the EventQueue is broken, exit after 1 minute
-			Thread.sleep(60 * 1000.toLong())
 			exitProcess(1)
 		}
 	}

src/main/kotlin/link/infra/packwiz/installer/UpdateManager.kt

@@ -19,6 +19,9 @@ import link.infra.packwiz.installer.ui.IUserInterface
 import link.infra.packwiz.installer.ui.IUserInterface.CancellationResult
 import link.infra.packwiz.installer.ui.IUserInterface.ExceptionListResult
 import link.infra.packwiz.installer.ui.data.InstallProgress
+import link.infra.packwiz.installer.util.Log
+import link.infra.packwiz.installer.util.ifletOrErr
+import link.infra.packwiz.installer.util.ifletOrWarn
 import okio.buffer
 import java.io.FileNotFoundException
 import java.io.FileReader
@@ -43,11 +46,17 @@ class UpdateManager internal constructor(private val opts: Options, val ui: IUse
 	}
 
 	data class Options(
-			var downloadURI: SpaceSafeURI? = null,
-			var manifestFile: String = "packwiz.json", // TODO: make configurable
-			var packFolder: String = ".",
-			var side: Side = Side.CLIENT
+		val downloadURI: SpaceSafeURI,
+		val manifestFile: String,
+		val packFolder: String,
+		val side: Side
 	) {
+		// Horrible workaround for default params not working cleanly with nullable values
+		companion object {
+			fun construct(downloadURI: SpaceSafeURI, manifestFile: String?, packFolder: String?, side: Side?) =
+				Options(downloadURI, manifestFile ?: "packwiz.json", packFolder ?: ".", side ?: Side.CLIENT)
+		}
+
 		enum class Side {
 			@SerializedName("client")
 			CLIENT("client"),
@@ -111,11 +120,9 @@ class UpdateManager internal constructor(private val opts: Options, val ui: IUse
 		} catch (e: FileNotFoundException) {
 			ManifestFile()
 		} catch (e: JsonSyntaxException) {
-			ui.handleExceptionAndExit(e)
-			return
+			ui.showErrorAndExit("Invalid local manifest file, try deleting ${opts.manifestFile}", e)
 		} catch (e: JsonIOException) {
-			ui.handleExceptionAndExit(e)
-			return
+			ui.showErrorAndExit("Failed to read local manifest file, try deleting ${opts.manifestFile}", e)
 		}
 
 		if (ui.cancelButtonPressed) {
@@ -125,19 +132,16 @@ class UpdateManager internal constructor(private val opts: Options, val ui: IUse
 
 		ui.submitProgress(InstallProgress("Loading pack file..."))
 		val packFileSource = try {
-			val src = getFileSource(opts.downloadURI!!)
+			val src = getFileSource(opts.downloadURI)
 			getHasher("sha256").getHashingSource(src)
 		} catch (e: Exception) {
-			// TODO: run cancellation window?
-			ui.handleExceptionAndExit(e)
-			return
+			ui.showErrorAndExit("Failed to download pack.toml", e)
 		}
 		val pf = packFileSource.buffer().use {
 			try {
 				Toml().read(it.inputStream()).to(PackFile::class.java)
 			} catch (e: IllegalStateException) {
-				ui.handleExceptionAndExit(e)
-				return
+				ui.showErrorAndExit("Failed to parse pack.toml", e)
 			}
 		}
 
@@ -169,40 +173,41 @@ class UpdateManager internal constructor(private val opts: Options, val ui: IUse
 				}
 			}
 			if (invalid) {
-				println("File $fileUri invalidated, marked for redownloading")
+				Log.info("File $fileUri invalidated, marked for redownloading")
 				invalidatedUris.add(fileUri)
 			}
 		}
 
 		if (manifest.packFileHash?.let { packFileSource.hashIsEqual(it) } == true && invalidatedUris.isEmpty()) {
-			println("Modpack is already up to date!")
+			Log.info("Modpack is already up to date!")
 			// todo: --force?
 			if (!ui.optionsButtonPressed) {
 				return
 			}
 		}
 
-		println("Modpack name: " + pf.name)
+		Log.info("Modpack name: ${pf.name}")
 
 		if (ui.cancelButtonPressed) {
 			showCancellationDialog()
 			handleCancellation()
 		}
 		try {
-			val index = pf.index!!
-			getNewLoc(opts.downloadURI, index.file)?.let { newLoc ->
-				index.hashFormat?.let { hashFormat ->
-					processIndex(
-						newLoc,
-						getHash(index.hashFormat!!, index.hash!!),
-						hashFormat,
-						manifest,
-						invalidatedUris
-					)
+			ifletOrWarn(pf.index, "No index file found") { index ->
+				ui.ifletOrErr(index.hashFormat, index.hash, "Pack has no hash or hashFormat for index") { hashFormat, hash ->
+					ui.ifletOrErr(getNewLoc(opts.downloadURI, index.file), "Pack has invalid index file: " + index.file) { newLoc ->
+						processIndex(
+							newLoc,
+							getHash(hashFormat, hash),
+							hashFormat,
+							manifest,
+							invalidatedUris
+						)
+					}
 				}
 			}
 		} catch (e1: Exception) {
-			ui.handleExceptionAndExit(e1)
+			ui.showErrorAndExit("Failed to process index file", e1)
 		}
 
 		handleCancellation()
@@ -221,8 +226,7 @@ class UpdateManager internal constructor(private val opts: Options, val ui: IUse
 		try {
 			FileWriter(Paths.get(opts.packFolder, opts.manifestFile).toString()).use { writer -> gson.toJson(manifest, writer) }
 		} catch (e: IOException) {
-			// TODO: add message?
-			ui.handleException(e)
+			ui.showErrorAndExit("Failed to save local manifest file", e)
 		}
 	}
 
@@ -232,7 +236,7 @@ class UpdateManager internal constructor(private val opts: Options, val ui: IUse
 
 	private fun processIndex(indexUri: SpaceSafeURI, indexHash: Hash, hashFormat: String, manifest: ManifestFile, invalidatedUris: List<SpaceSafeURI>) {
 		if (manifest.indexFileHash == indexHash && invalidatedUris.isEmpty()) {
-			println("Modpack files are already up to date!")
+			Log.info("Modpack files are already up to date!")
 			if (!ui.optionsButtonPressed) {
 				return
 			}
@@ -243,20 +247,18 @@ class UpdateManager internal constructor(private val opts: Options, val ui: IUse
 			val src = getFileSource(indexUri)
 			getHasher(hashFormat).getHashingSource(src)
 		} catch (e: Exception) {
-			// TODO: run cancellation window?
-			ui.handleExceptionAndExit(e)
-			return
+			ui.showErrorAndExit("Failed to download index file", e)
 		}
+
 		val indexFile = try {
 			Toml().read(indexFileSource.buffer().inputStream()).to(IndexFile::class.java)
 		} catch (e: IllegalStateException) {
-			ui.handleExceptionAndExit(e)
-			return
+			ui.showErrorAndExit("Failed to parse index file", e)
 		}
 		if (!indexFileSource.hashIsEqual(indexHash)) {
-			ui.handleExceptionAndExit(RuntimeException("Your index hash is invalid! Please run packwiz refresh on the pack again"))
-			return
+			ui.showErrorAndExit("Your index file hash is invalid! The pack developer should packwiz refresh on the pack again")
 		}
+
 		if (ui.cancelButtonPressed) {
 			showCancellationDialog()
 			return
@@ -274,8 +276,7 @@ class UpdateManager internal constructor(private val opts: Options, val ui: IUse
 					try {
 						Files.deleteIfExists(Paths.get(opts.packFolder, file.cachedLocation))
 					} catch (e: IOException) {
-						// TODO: should this be shown to the user in some way?
-						e.printStackTrace()
+						Log.warn("Failed to delete optional disabled file", e)
 					}
 					// Set to null, as it doesn't exist anymore
 					file.cachedLocation = null
@@ -285,8 +286,8 @@ class UpdateManager internal constructor(private val opts: Options, val ui: IUse
 					if (!alreadyDeleted) {
 						try {
 							Files.deleteIfExists(Paths.get(opts.packFolder, file.cachedLocation))
-						} catch (e: IOException) { // TODO: should this be shown to the user in some way?
-							e.printStackTrace()
+						} catch (e: IOException) {
+							Log.warn("Failed to delete file removed from index", e)
 						}
 					}
 					it.remove()
@@ -302,14 +303,14 @@ class UpdateManager internal constructor(private val opts: Options, val ui: IUse
 
 		// TODO: progress bar?
 		if (indexFile.files.isEmpty()) {
-			println("Warning: Index is empty!")
+			Log.warn("Index is empty!")
 		}
 		val tasks = createTasksFromIndex(indexFile, indexFile.hashFormat, opts.side)
 		// If the side changes, invalidate EVERYTHING just in case
 		// Might not be needed, but done just to be safe
 		val invalidateAll = opts.side != manifest.cachedSide
 		if (invalidateAll) {
-			println("Side changed, invalidating all mods")
+			Log.info("Side changed, invalidating all mods")
 		}
 		tasks.forEach{ f ->
 			// TODO: should linkedfile be checked as well? should this be done in the download section?
@@ -377,18 +378,15 @@ class UpdateManager internal constructor(private val opts: Options, val ui: IUse
 			}
 		}
 		for (i in tasks.indices) {
-			var task: DownloadTask?
-			task = try {
+			val task: DownloadTask = try {
 				completionService.take().get()
 			} catch (e: InterruptedException) {
-				ui.handleException(e)
-				null
+				ui.showErrorAndExit("Interrupted when consuming download tasks", e)
 			} catch (e: ExecutionException) {
-				ui.handleException(e)
-				null
+				ui.showErrorAndExit("Failed to execute download task", e)
 			}
 			// Update manifest - If there were no errors cachedFile has already been modified in place (good old pass by reference)
-			task?.cachedFile?.let { file ->
+			task.cachedFile?.let { file ->
 				if (task.failed()) {
 					val oldFile = file.revert
 					if (oldFile != null) {
@@ -399,17 +397,11 @@ class UpdateManager internal constructor(private val opts: Options, val ui: IUse
 				}
 			}
 
-			var progress: String
-			if (task != null) {
-				val exDetails = task.exceptionDetails
-				if (exDetails != null) {
-					progress = "Failed to download ${exDetails.name}: ${exDetails.exception.message}"
-					exDetails.exception.printStackTrace()
-				} else {
-					progress = "Downloaded ${task.name}"
-				}
+			val exDetails = task.exceptionDetails
+			val progress = if (exDetails != null) {
+				"Failed to download ${exDetails.name}: ${exDetails.exception.message}"
 			} else {
-				progress = "Failed to download, unknown reason"
+				"Downloaded ${task.name}"
 			}
 			ui.submitProgress(InstallProgress(progress, i + 1, tasks.size))
 

src/main/kotlin/link/infra/packwiz/installer/request/HandlerManager.kt

@@ -14,6 +14,7 @@ object HandlerManager {
 			RequestHandlerFile()
 	)
 
+	 // TODO: get rid of nullable stuff here
 	@JvmStatic
 	fun getNewLoc(base: SpaceSafeURI?, loc: SpaceSafeURI?): SpaceSafeURI? {
 		if (loc == null) {
@@ -32,6 +33,8 @@ object HandlerManager {
 	// Zip handler discards once read, requesting multiple times on other handlers would cause multiple downloads
 	// Caching system? Copy from already downloaded files?
 
+	// TODO: change to use something more idiomatic than exceptions?
+
 	@JvmStatic
 	@Throws(Exception::class)
 	fun getFileSource(loc: SpaceSafeURI): Source {

src/main/kotlin/link/infra/packwiz/installer/ui/IUserInterface.kt

@@ -3,16 +3,15 @@ package link.infra.packwiz.installer.ui
 import link.infra.packwiz.installer.ui.data.ExceptionDetails
 import link.infra.packwiz.installer.ui.data.IOptionDetails
 import link.infra.packwiz.installer.ui.data.InstallProgress
-import kotlin.system.exitProcess
 
 interface IUserInterface {
 	fun show()
 	fun dispose()
-	fun handleException(e: Exception)
-	fun handleExceptionAndExit(e: Exception) {
-		handleException(e)
-		exitProcess(1)
+
+	fun showErrorAndExit(message: String): Nothing {
+		showErrorAndExit(message, null)
 	}
+	fun showErrorAndExit(message: String, e: Exception?): Nothing
 
 	fun setTitle(title: String) {}
 	fun submitProgress(progress: InstallProgress)

src/main/kotlin/link/infra/packwiz/installer/ui/cli/CLIHandler.kt

@@ -5,6 +5,7 @@ import link.infra.packwiz.installer.ui.IUserInterface.ExceptionListResult
 import link.infra.packwiz.installer.ui.data.ExceptionDetails
 import link.infra.packwiz.installer.ui.data.IOptionDetails
 import link.infra.packwiz.installer.ui.data.InstallProgress
+import link.infra.packwiz.installer.util.Log
 import kotlin.system.exitProcess
 
 class CLIHandler : IUserInterface {
@@ -13,8 +14,13 @@ class CLIHandler : IUserInterface {
 	@Volatile
 	override var cancelButtonPressed = false
 
-	override fun handleException(e: Exception) {
-		e.printStackTrace()
+	override fun showErrorAndExit(message: String, e: Exception?): Nothing {
+		if (e != null) {
+			Log.fatal(message, e)
+		} else {
+			Log.fatal(message)
+		}
+		exitProcess(1)
 	}
 
 	override fun show() {}
@@ -36,7 +42,7 @@ class CLIHandler : IUserInterface {
 		for (opt in options) {
 			opt.optionValue = true
 			// TODO: implement option choice in the CLI?
-			println("Warning: accepting option " + opt.name + " as option choosing is not implemented in the CLI")
+			Log.warn("Accepting option ${opt.name} as option choosing is not implemented in the CLI")
 		}
 		return false // Can't be cancelled!
 	}
@@ -44,9 +50,9 @@ class CLIHandler : IUserInterface {
 	override fun showExceptions(exceptions: List<ExceptionDetails>, numTotal: Int, allowsIgnore: Boolean): ExceptionListResult {
 		println("Failed to download modpack, the following errors were encountered:")
 		for (ex in exceptions) {
-			println(ex.name + ": ")
+			print(ex.name + ": ")
 			ex.exception.printStackTrace()
 		}
-		exitProcess(1)
+		return ExceptionListResult.CANCEL
 	}
 }

src/main/kotlin/link/infra/packwiz/installer/ui/gui/GUIHandler.kt

@@ -5,6 +5,7 @@ import link.infra.packwiz.installer.ui.IUserInterface.ExceptionListResult
 import link.infra.packwiz.installer.ui.data.ExceptionDetails
 import link.infra.packwiz.installer.ui.data.IOptionDetails
 import link.infra.packwiz.installer.ui.data.InstallProgress
+import link.infra.packwiz.installer.util.Log
 import java.awt.EventQueue
 import java.util.concurrent.CompletableFuture
 import javax.swing.JDialog
@@ -27,8 +28,7 @@ class GUIHandler : IUserInterface {
 			try {
 				UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName())
 			} catch (e: Exception) {
-				println("Failed to set look and feel:")
-				e.printStackTrace()
+				Log.warn("Failed to set look and feel", e)
 			}
 			frmPackwizlauncher = InstallWindow(this).apply {
 				title = this@GUIHandler.title
@@ -44,23 +44,23 @@ class GUIHandler : IUserInterface {
 		frmPackwizlauncher.dispose()
 	}
 
-	override fun handleException(e: Exception) {
-		e.printStackTrace()
-		EventQueue.invokeAndWait {
-			JOptionPane.showMessageDialog(null,
-					"An error occurred: \n" + e.javaClass.canonicalName + ": " + e.message,
+	override fun showErrorAndExit(message: String, e: Exception?): Nothing {
+		if (e != null) {
+			Log.fatal(message, e)
+			EventQueue.invokeAndWait {
+				JOptionPane.showMessageDialog(null,
+					"$message: $e",
 					title, JOptionPane.ERROR_MESSAGE)
-		}
-	}
-
-	override fun handleExceptionAndExit(e: Exception) {
-		e.printStackTrace()
-		EventQueue.invokeAndWait {
-			JOptionPane.showMessageDialog(null,
-					"A fatal error occurred: \n" + e.javaClass.canonicalName + ": " + e.message,
+			}
+		} else {
+			Log.fatal(message)
+			EventQueue.invokeAndWait {
+				JOptionPane.showMessageDialog(null,
+					message,
 					title, JOptionPane.ERROR_MESSAGE)
-			exitProcess(1)
+			}
 		}
+		exitProcess(1)
 	}
 
 	override fun setTitle(title: String) {
@@ -78,8 +78,7 @@ class GUIHandler : IUserInterface {
 			sb.append(") ")
 		}
 		sb.append(progress.message)
-		// TODO: better logging library?
-		println(sb.toString())
+		Log.info(sb.toString())
 		EventQueue.invokeLater {
 			frmPackwizlauncher.displayProgress(progress)
 		}

src/main/kotlin/link/infra/packwiz/installer/util/Exts.kt

@@ -0,0 +1,38 @@
+package link.infra.packwiz.installer.util
+
+import link.infra.packwiz.installer.ui.IUserInterface
+
+inline fun <T> iflet(value: T?, whenNotNull: (T) -> Unit) {
+	if (value != null) {
+		whenNotNull(value)
+	}
+}
+
+inline fun <T, U> IUserInterface.ifletOrErr(value: T?, message: String, whenNotNull: (T) -> U): U =
+	if (value != null) {
+		whenNotNull(value)
+	} else {
+		this.showErrorAndExit(message)
+	}
+
+inline fun <T, U, V> IUserInterface.ifletOrErr(value: T?, value2: U?, message: String, whenNotNull: (T, U) -> V): V =
+	if (value != null && value2 != null) {
+		whenNotNull(value, value2)
+	} else {
+		this.showErrorAndExit(message)
+	}
+
+inline fun <T> ifletOrWarn(value: T?, message: String, whenNotNull: (T) -> Unit) {
+	if (value != null) {
+		whenNotNull(value)
+	} else {
+		Log.warn(message)
+	}
+}
+
+inline fun <T, U> iflet(value: T?, whenNotNull: (T) -> U, whenNull: () -> U): U =
+	if (value != null) {
+		whenNotNull(value)
+	} else {
+		whenNull()
+	}

src/main/kotlin/link/infra/packwiz/installer/util/Log.kt

@@ -0,0 +1,16 @@
+package link.infra.packwiz.installer.util
+
+object Log {
+	fun info(message: String) = println(message)
+
+	fun warn(message: String) = println("[Warning] $message")
+	fun warn(message: String, exception: Exception) = println("[Warning] $message: $exception")
+
+	fun fatal(message: String) {
+		println("[FATAL] $message")
+	}
+	fun fatal(message: String, exception: Exception) {
+		println("[FATAL] $message: ")
+		exception.printStackTrace()
+	}
+}