Bump bytecode to java 11 (#1530)

Author: nedtwigg

Diff for: CHANGES.md

@@ -10,6 +10,8 @@ This document is intended for Spotless developers.
 We adhere to the [keepachangelog](https://keepachangelog.com/en/1.0.0/) format (starting after version `1.27.0`).
 
 ## [Unreleased]
+### Changes
+* **POTENTIALLY BREAKING** Bump bytecode from Java 8 to 11 ([#1530](https://github.com/diffplug/spotless/pull/1530) part 2 of [#1337](https://github.com/diffplug/spotless/issues/1337))
 
 ## [2.34.0] - 2023-01-26
 ### Added

Diff for: gradle.properties

@@ -16,7 +16,7 @@ artifactIdMaven=spotless-maven-plugin
 artifactIdGradle=spotless-plugin-gradle
 
 # Build requirements
-VER_JAVA=1.8
+VER_JAVA=11
 VER_SPOTBUGS=4.7.3
 VER_JSR_305=3.0.2
 
@@ -25,7 +25,7 @@ VER_SLF4J=[1.6,2.0[
 
 # Used in multiple places
 VER_DURIAN=1.2.0
-VER_JGIT=5.13.1.202206130422-r
+VER_JGIT=6.4.0.202211300538-r
 VER_JUNIT=5.9.2
 VER_ASSERTJ=3.24.2
-VER_MOCKITO=4.11.0
+VER_MOCKITO=5.0.0

Diff for: gradle/java-setup.gradle

@@ -4,10 +4,10 @@
 
 // setup java
 apply plugin: 'java'
-
-sourceCompatibility = VER_JAVA
-targetCompatibility = VER_JAVA
-tasks.withType(JavaCompile).configureEach { options.encoding = 'UTF-8' }
+tasks.withType(JavaCompile).configureEach {
+	options.encoding = 'UTF-8'
+	options.release = Integer.parseInt(VER_JAVA)
+}
 
 //////////////
 // SPOTBUGS //

Diff for: lib-extra/src/main/java/com/diffplug/spotless/extra/integration/DiffMessageFormatter.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2021 DiffPlug
+ * Copyright 2016-2023 DiffPlug
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -143,18 +143,14 @@ public String getMessage() {
 				Objects.requireNonNull(runToFix, "runToFix");
 				Objects.requireNonNull(formatter, "formatter");
 				Objects.requireNonNull(problemFiles, "problemFiles");
-				DiffMessageFormatter diffFormater = new DiffMessageFormatter(this);
+				DiffMessageFormatter diffFormater = new DiffMessageFormatter(formatter, problemFiles);
 				return "The following files had format violations:\n"
 						+ diffFormater.buffer
 						+ runToFix;
 			} catch (IOException e) {
 				throw Errors.asRuntime(e);
 			}
 		}
-
-		String relativePath(File file) {
-			return formatter.getRootDir().relativize(file.toPath()).toString();
-		}
 	}
 
 	private static final int MAX_CHECK_MESSAGE_LINES = 50;
@@ -163,25 +159,32 @@ String relativePath(File file) {
 	private final StringBuilder buffer = new StringBuilder(MAX_CHECK_MESSAGE_LINES * 64);
 	private int numLines = 0;
 
-	private DiffMessageFormatter(Builder builder) throws IOException {
-		ListIterator<File> problemIter = builder.problemFiles.listIterator();
+	private final CleanProvider formatter;
+
+	private DiffMessageFormatter(CleanProvider formatter, List<File> problemFiles) throws IOException {
+		this.formatter = Objects.requireNonNull(formatter, "formatter");
+		ListIterator<File> problemIter = problemFiles.listIterator();
 		while (problemIter.hasNext() && numLines < MAX_CHECK_MESSAGE_LINES) {
 			File file = problemIter.next();
-			addFile(builder.relativePath(file) + "\n" + DiffMessageFormatter.diff(builder, file));
+			addFile(relativePath(file) + "\n" + diff(file));
 		}
 		if (problemIter.hasNext()) {
-			int remainingFiles = builder.problemFiles.size() - problemIter.nextIndex();
+			int remainingFiles = problemFiles.size() - problemIter.nextIndex();
 			if (remainingFiles >= MAX_FILES_TO_LIST) {
 				buffer.append("Violations also present in ").append(remainingFiles).append(" other files.\n");
 			} else {
 				buffer.append("Violations also present in:\n");
 				while (problemIter.hasNext()) {
-					addIntendedLine(NORMAL_INDENT, builder.relativePath(problemIter.next()));
+					addIntendedLine(NORMAL_INDENT, relativePath(problemIter.next()));
 				}
 			}
 		}
 	}
 
+	private String relativePath(File file) {
+		return formatter.getRootDir().relativize(file.toPath()).toString();
+	}
+
 	private static final int MIN_LINES_PER_FILE = 4;
 	private static final Splitter NEWLINE_SPLITTER = Splitter.on('\n');
 
@@ -230,10 +233,10 @@ private void addIntendedLine(String indent, String line) {
 	 * look like if formatted using the given formatter. Does not end with any newline
 	 * sequence (\n, \r, \r\n).
 	 */
-	private static String diff(Builder builder, File file) throws IOException {
-		String raw = new String(Files.readAllBytes(file.toPath()), builder.formatter.getEncoding());
+	private String diff(File file) throws IOException {
+		String raw = new String(Files.readAllBytes(file.toPath()), formatter.getEncoding());
 		String rawUnix = LineEnding.toUnix(raw);
-		String formatted = builder.formatter.getFormatted(file, rawUnix);
+		String formatted = formatter.getFormatted(file, rawUnix);
 		String formattedUnix = LineEnding.toUnix(formatted);
 
 		if (rawUnix.equals(formattedUnix)) {

Diff for: lib/build.gradle

@@ -90,7 +90,7 @@ dependencies {
 	compatKtLint0Dot48Dot0CompileAndTestOnly 'com.pinterest.ktlint:ktlint-ruleset-experimental:0.48.0'
 	compatKtLint0Dot48Dot0CompileAndTestOnly 'com.pinterest.ktlint:ktlint-ruleset-standard:0.48.0'
 
-	String VER_SCALAFMT="3.6.1"
+	String VER_SCALAFMT="3.7.1"
 	scalafmtCompileOnly "org.scalameta:scalafmt-core_2.13:$VER_SCALAFMT"
 
 	String VER_DIKTAT = "1.2.4.2"

Diff for: lib/src/main/java/com/diffplug/spotless/EncodingErrorMsg.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2022 DiffPlug
+ * Copyright 2016-2023 DiffPlug
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -15,7 +15,6 @@
  */
 package com.diffplug.spotless;
 
-import java.nio.Buffer;
 import java.nio.ByteBuffer;
 import java.nio.CharBuffer;
 import java.nio.charset.Charset;
@@ -116,8 +115,8 @@ private static void addIfAvailable(Collection<Charset> charsets, String name) {
 	}
 
 	private void appendExample(Charset charset, boolean must) {
-		java8fix(byteBuf).clear();
-		java8fix(charBuf).clear();
+		byteBuf.clear();
+		charBuf.clear();
 
 		CharsetDecoder decoder = charset.newDecoder();
 		if (!must) {
@@ -135,7 +134,7 @@ private void appendExample(Charset charset, boolean must) {
 					.onUnmappableCharacter(CodingErrorAction.REPLACE)
 					.decode(byteBuf, charBuf, true);
 		}
-		java8fix(charBuf).flip();
+		charBuf.flip();
 
 		int start = Math.max(unrepresentable - CONTEXT, 0);
 		int end = Math.min(charBuf.limit(), unrepresentable + CONTEXT + 1);
@@ -147,9 +146,4 @@ private void appendExample(Charset charset, boolean must) {
 		message.append(" <- ");
 		message.append(charset.name());
 	}
-
-	/** Fixes https://jira.mongodb.org/browse/JAVA-2559, as reported in https://github.com/diffplug/spotless/issues/1081 */
-	private static Buffer java8fix(Buffer b) {
-		return b;
-	}
 }

Diff for: lib/src/main/java/com/diffplug/spotless/FeatureClassLoader.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2022 DiffPlug
+ * Copyright 2016-2023 DiffPlug
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -24,8 +24,6 @@
 import java.security.ProtectionDomain;
 import java.util.Objects;
 
-import javax.annotation.Nullable;
-
 /**
  * This class loader is used to load classes of Spotless features from a search
  * path of URLs.<br/>
@@ -103,35 +101,14 @@ public URL findResource(String name) {
 
 	private static ByteBuffer urlToByteBuffer(URL url) throws IOException {
 		ByteArrayOutputStream buffer = new ByteArrayOutputStream();
-		int nRead;
-		byte[] data = new byte[1024];
-		InputStream inputStream = url.openStream();
-		while ((nRead = inputStream.read(data, 0, data.length)) != -1) {
-			buffer.write(data, 0, nRead);
+		try (InputStream inputStream = url.openStream()) {
+			inputStream.transferTo(buffer);
 		}
 		buffer.flush();
 		return ByteBuffer.wrap(buffer.toByteArray());
 	}
 
-	/**
-	 * Making spotless Java 9+ compatible. In Java 8 (and minor) the bootstrap
-	 * class loader saw every platform class. In Java 9+ it was changed so the
-	 * bootstrap class loader does not see all classes anymore. This might lead
-	 * to ClassNotFoundException in formatters (e.g. freshmark).
-	 *
-	 * @return <code>null</code> on Java 8 (and minor), otherwise <code>PlatformClassLoader</code>
-	 */
-	@Nullable
 	private static ClassLoader getParentClassLoader() {
-		double version = Double.parseDouble(System.getProperty("java.specification.version"));
-		if (version > 1.8) {
-			try {
-				return (ClassLoader) ClassLoader.class.getMethod("getPlatformClassLoader").invoke(null);
-			} catch (Exception e) {
-				throw ThrowingEx.asRuntime(e);
-			}
-		} else {
-			return null;
-		}
+		return ThrowingEx.get(() -> (ClassLoader) ClassLoader.class.getMethod("getPlatformClassLoader").invoke(null));
 	}
 }