Fix IntelliJ warnings, update .gitignore

.gitignore

@@ -1,5 +1,6 @@
-# Created by https://www.gitignore.io/api/java,gradle,eclipse
-# Edit at https://www.gitignore.io/?templates=java,gradle,eclipse
+
+# Created by https://www.toptal.com/developers/gitignore/api/java,gradle,eclipse,intellij+all
+# Edit at https://www.toptal.com/developers/gitignore?templates=java,gradle,eclipse,intellij+all
 
 ### Eclipse ###
 .metadata
@@ -52,23 +53,109 @@ local.properties
 
 # Annotation Processing
 .apt_generated/
+.apt_generated_test/
 
 # Scala IDE specific (Scala & Java development for Eclipse)
 .cache-main
 .scala_dependencies
 .worksheet
 
-### Eclipse Patch ###
-# Eclipse Core
+# Uncomment this line if you wish to ignore the project description file.
+# Typically, this file would be tracked if it contains build/dependency configurations:
 .project
 
-# JDT-specific (Eclipse Java Development Tools)
-.classpath
+### Eclipse Patch ###
+# Spring Boot Tooling
+.sts4-cache/
 
-# Annotation Processing
-.apt_generated
+### Intellij+all ###
+# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio, WebStorm and Rider
+# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
 
-.sts4-cache/
+# User-specific stuff
+.idea/**/workspace.xml
+.idea/**/tasks.xml
+.idea/**/usage.statistics.xml
+.idea/**/dictionaries
+.idea/**/shelf
+
+# Generated files
+.idea/**/contentModel.xml
+
+# Sensitive or high-churn files
+.idea/**/dataSources/
+.idea/**/dataSources.ids
+.idea/**/dataSources.local.xml
+.idea/**/sqlDataSources.xml
+.idea/**/dynamic.xml
+.idea/**/uiDesigner.xml
+.idea/**/dbnavigator.xml
+
+# Gradle
+.idea/**/gradle.xml
+.idea/**/libraries
+
+# Gradle and Maven with auto-import
+# When using Gradle or Maven with auto-import, you should exclude module files,
+# since they will be recreated, and may cause churn.  Uncomment if using
+# auto-import.
+# .idea/artifacts
+# .idea/compiler.xml
+# .idea/jarRepositories.xml
+# .idea/modules.xml
+# .idea/*.iml
+# .idea/modules
+# *.iml
+# *.ipr
+
+# CMake
+cmake-build-*/
+
+# Mongo Explorer plugin
+.idea/**/mongoSettings.xml
+
+# File-based project format
+*.iws
+
+# IntelliJ
+out/
+
+# mpeltonen/sbt-idea plugin
+.idea_modules/
+
+# JIRA plugin
+atlassian-ide-plugin.xml
+
+# Cursive Clojure plugin
+.idea/replstate.xml
+
+# Crashlytics plugin (for Android Studio and IntelliJ)
+com_crashlytics_export_strings.xml
+crashlytics.properties
+crashlytics-build.properties
+fabric.properties
+
+# Editor-based Rest Client
+.idea/httpRequests
+
+# Android studio 3.1+ serialized cache file
+.idea/caches/build_file_checksums.ser
+
+### Intellij+all Patch ###
+# Ignores the whole .idea folder and all .iml files
+# See https://github.com/joeblau/gitignore.io/issues/186 and https://github.com/joeblau/gitignore.io/issues/360
+
+.idea/
+
+# Reason: https://github.com/joeblau/gitignore.io/issues/186#issuecomment-249601023
+
+*.iml
+modules.xml
+.idea/misc.xml
+*.ipr
+
+# Sonarlint plugin
+.idea/sonarlint
 
 ### Java ###
 # Compiled class file
@@ -114,7 +201,8 @@ gradle-app.setting
 ### Gradle Patch ###
 **/build/
 
-# End of https://www.gitignore.io/api/java,gradle,eclipse
+# End of https://www.toptal.com/developers/gitignore/api/java,gradle,eclipse,intellij+all
 
 /.vscode/
-/packwiz.json
+/packwiz.json
+.classpath

src/main/java/link/infra/packwiz/installer/bootstrap/LoadJAR.java

@@ -44,7 +44,7 @@ public static boolean addOptions(Options options, String path) {
 		return true;
 	}
 
-	public static void start(String[] args, String path) throws ClassNotFoundException, Exception {
+	public static void start(String[] args, String path) throws Exception {
 		loadClass(path);
 
 		// Must be casted to Object (not array) because varargs
@@ -63,12 +63,12 @@ public static String getVersion(String path) {
 		try {
 			Manifest mf = jarStream.getManifest();
 			version = mf.getMainAttributes().getValue("Implementation-Version");
-		} catch (Exception e) {}
+		} catch (Exception ignored) {}
 
 		// Clean up
 		try {
 			jarStream.close();
-		} catch (IOException e) {}
+		} catch (IOException ignored) {}
 		return version;
 	}
 }

src/main/java/link/infra/packwiz/installer/bootstrap/Main.java

@@ -128,9 +128,7 @@ private void doUpdate() throws IOException, GithubException {
 				}
 				return;
 			}
-
-			// Assist with GC a bit, probably not necessary
-			backup = null;
+
 			System.out.println("Update successful!");
 		} else {
 			System.out.println("Already up to date!");
@@ -201,7 +199,7 @@ private void parseOptions(String[] args) throws ParseException {
 	// Remove invalid arguments, because Commons CLI chokes on invalid arguments
 	// (that should be passed to packwiz-installer)
 	private String[] filterArgs(String[] args, Options options) {
-		List<String> argsList = new ArrayList<String>(args.length);
+		List<String> argsList = new ArrayList<>(args.length);
 		boolean prevOptWasArg = false;
 		for (String arg : args) {
 			if (arg.charAt(0) == '-' && options.hasOption(arg)) {
@@ -221,13 +219,13 @@ private String[] filterArgs(String[] args, Options options) {
 		return argsList.toArray(new String[0]);
 	}
 
-	private class Release {
+	private static class Release {
 		String tagName = null;
 		String downloadURL = null;
 		String assetURL = null;
 	}
 
-	private class GithubException extends Exception {
+	private static class GithubException extends Exception {
 		private static final long serialVersionUID = 3843811090801607241L;
 
 		public GithubException() {
@@ -239,7 +237,7 @@ public GithubException(String message) {
 		}
 	}
 
-	class ConnMonitorInputStream extends InputStream {
+	static class ConnMonitorInputStream extends InputStream {
 		private InputStream in = null;
 		private int size = -1;
 		private int bytesRead = 0;

src/main/java/link/infra/packwiz/installer/bootstrap/RollbackHandler.java

@@ -17,7 +17,7 @@ public RollbackHandler(String path) {
 			storage = Files.readAllBytes(rollbackPath);
 			hasRollback = true;
 		// Ignore errors, it probably doesn't exist!
-		} catch (IOException e) {}
+		} catch (IOException ignored) {}
 	}
 
 	public void rollback() throws IOException {