18 files changed, 243 insertions, 23 deletions

diff --git a/doc/changelog.markdown b/doc/changelog.markdown
index 64ddcc7f..b7f678a7 100644
--- a/doc/changelog.markdown
+++ b/doc/changelog.markdown
@@ -4,6 +4,7 @@ Lombok Changelog
 ### v1.18.7 "Edgy Guinea Pig"
 * FEATURE: You can now suppress generation of the `builder` method when using `@Builder`; usually because you're only interested in the `toBuilder` method. As a convenience we won't emit warnings about missing `@Builder.Default` annotations when you do this. [Issue #2046](https://github.com/rzwitserloot/lombok/issues/2046)
 * FEATURE: When using `@NonNull`, or any other annotation that would result in a null-check, you can configure to generate an assert statement instead. [Issue #2078](https://github.com/rzwitserloot/lombok/issues/2078).
+* PLATFORM: A few lombok features (most notably delombok) failed on JDK12. [Issue #2082](https://github.com/rzwitserloot/lombok/issues/2082)
 * BUGFIX: var/val on methods that return an intersection type would now work in Eclipse. [Issue #1986](https://github.com/rzwitserloot/lombok/issues/1986)
 * BUGFIX: Fix for java6 regression if a field has javadoc. [Issue #2066](https://github.com/rzwitserloot/lombok/issues/2066)
 * BUGFIX: Delombok now delomboks java10's own `var` as `var` and not as the actual underlying type. [Issue #2049](https://github.com/rzwitserloot/lombok/issues/2049)
diff --git a/src/delombok/lombok/delombok/Delombok.java b/src/delombok/lombok/delombok/Delombok.java
index 8f4f99e5..76b2715a 100755
--- a/src/delombok/lombok/delombok/Delombok.java
+++ b/src/delombok/lombok/delombok/Delombok.java
@@ -93,6 +93,7 @@ public class Delombok {
 	private boolean noCopy;
 	private boolean onlyChanged;
 	private boolean force = false;
+	private boolean disablePreview;
 	private String classpath, sourcepath, bootclasspath, modulepath;
 	private LinkedHashMap<File, File> fileToBase = new LinkedHashMap<File, File>();
 	private List<File> filesToParse = new ArrayList<File>();
@@ -158,6 +159,10 @@ public class Delombok {
 		@Description("Output only changed files (implies -n)")
 		private boolean onlyChanged;
 		
+		@Description("By default lombok enables preview features if available (introduced in JDK 12). With this option, lombok won't do that.")
+		@FullName("disable-preview")
+		private boolean disablePreview;
+		
 		private boolean help;
 	}
 	
@@ -281,6 +286,7 @@ public class Delombok {
 		
 		if (args.verbose) delombok.setVerbose(true);
 		if (args.nocopy || args.onlyChanged) delombok.setNoCopy(true);
+		if (args.disablePreview) delombok.setDisablePreview(true);
 		if (args.onlyChanged) delombok.setOnlyChanged(true);
 		if (args.print) {
 			delombok.setOutputToStandardOut();
@@ -516,6 +522,10 @@ public class Delombok {
 		this.noCopy = noCopy;
 	}
 	
+	public void setDisablePreview(boolean disablePreview) {
+		this.disablePreview = disablePreview;
+	}
+	
 	public void setOnlyChanged(boolean onlyChanged) {
 		this.onlyChanged = onlyChanged;
 	}
@@ -684,6 +694,9 @@ public class Delombok {
 				argsList.add("--module-path");
 				argsList.add(modulepath);
 			}
+			
+			if (!disablePreview && Javac.getJavaCompilerVersion() >= 11) argsList.add("--enable-preview");
+			
 			String[] argv = argsList.toArray(new String[0]);
 			args.init("javac", argv);
 			options.put("diags.legacy", "TRUE");
diff --git a/src/delombok/lombok/delombok/PrettyPrinter.java b/src/delombok/lombok/delombok/PrettyPrinter.java
index 832dbe0a..3477c51c 100644
--- a/src/delombok/lombok/delombok/PrettyPrinter.java
+++ b/src/delombok/lombok/delombok/PrettyPrinter.java
@@ -1046,9 +1046,17 @@ public class PrettyPrinter extends JCTree.Visitor {
 	
 	@Override public void visitBreak(JCBreak tree) {
 		aPrint("break");
-		if (tree.label != null) {
+		
+		JCExpression value = readObject(tree, "value", null); // JDK 12+
+		if (value != null) {
 			print(" ");
-			print(tree.label);
+			print(value);
+		} else {
+			Name label = readObject(tree, "label", null);
+			if (label != null) {
+				print(" ");
+				print(label);
+			}
 		}
 		println(";", tree);
 	}
@@ -1230,16 +1238,41 @@ public class PrettyPrinter extends JCTree.Visitor {
 	}
 	
 	@Override public void visitCase(JCCase tree) {
-		if (tree.pat == null) {
+		// Starting with JDK12, switches allow multiple expressions per case, and can take the form of an expression (preview feature).
+		
+		List<JCExpression> pats = readObject(tree, "pats", null); // JDK 12+
+		if (pats == null) {
+			JCExpression pat = readObject(tree, "pat", null); // JDK -11
+			pats = pat == null ? List.<JCExpression>nil() : List.of(pat);
+		}
+		
+		if (pats.isEmpty()) {
 			aPrint("default");
 		} else {
 			aPrint("case ");
-			print(tree.pat);
+			print(pats, ", ");
+		}
+		
+		Enum<?> caseKind = readObject(tree, "caseKind", null); // JDK 12+
+		
+		if (caseKind != null && caseKind.name().equalsIgnoreCase("RULE")) {
+			print(" -> ");
+			if (tree.stats.head instanceof JCBreak) {
+				JCBreak b = (JCBreak) tree.stats.head;
+				print((JCExpression) readObject(b, "value", null));
+				print(";");
+				needsNewLine = true;
+				needsAlign = true;
+			} else {
+				print(tree.stats.head);
+				if (tree.stats.head instanceof JCBlock) needsNewLine = false;
+			}
+		} else {
+			println(": ");
+			indent++;
+			print(tree.stats, "");
+			indent--;
 		}
-		println(": ");
-		indent++;
-		print(tree.stats, "");
-		indent--;
 	}
 	
 	@Override public void visitCatch(JCCatch tree) {
@@ -1259,10 +1292,26 @@ public class PrettyPrinter extends JCTree.Visitor {
 			print(")");
 		}
 		println(" {");
-		print(tree.cases, "\n");
+		print(tree.cases, "");
 		aPrintln("}", tree);
 	}
 	
+	void printSwitchExpression(JCTree tree) {
+		aPrint("switch ");
+		JCExpression selector = readObject(tree, "selector", null);
+		if (selector instanceof JCParens) {
+			print(selector);
+		} else {
+			print("(");
+			print(selector);
+			print(")");
+		}
+		println(" {");
+		List<JCCase> cases = readObject(tree, "cases", null);
+		print(cases, "");
+		aPrint("}");
+	}
+	
 	@Override public void visitTry(JCTry tree) {
 		aPrint("try ");
 		List<?> resources = readObject(tree, "resources", List.nil());
@@ -1481,6 +1530,8 @@ public class PrettyPrinter extends JCTree.Visitor {
 			printAnnotatedType0(tree);
 		} else if ("JCPackageDecl".equals(simpleName)) {
 			// Starting with JDK9, this is inside the import list, but we've already printed it. Just ignore it.
+		} else if ("JCSwitchExpression".equals(simpleName)) { // Introduced as preview feature in JDK12
+			printSwitchExpression(tree);
 		} else {
 			throw new AssertionError("Unhandled tree type: " + tree.getClass() + ": " + tree);
 		}
diff --git a/src/delombok/lombok/delombok/ant/DelombokTask.java b/src/delombok/lombok/delombok/ant/DelombokTask.java
index e09b8ed2..cb31ef4d 100644
--- a/src/delombok/lombok/delombok/ant/DelombokTask.java
+++ b/src/delombok/lombok/delombok/ant/DelombokTask.java
@@ -154,10 +154,6 @@ class Tasks {
 			path.add(set);
 		}
 		
-		public Format createFormat() {
-			return new Format();
-		}
-		
 		public void addFormat(Format format) {
 			formatOptions.add(format);
 		}
diff --git a/src/eclipseAgent/lombok/eclipse/agent/PatchVal.java b/src/eclipseAgent/lombok/eclipse/agent/PatchVal.java
index 12f4ad3d..b32c99cd 100644
--- a/src/eclipseAgent/lombok/eclipse/agent/PatchVal.java
+++ b/src/eclipseAgent/lombok/eclipse/agent/PatchVal.java
@@ -263,11 +263,15 @@ public class PatchVal {
 				resolved = null;
 			}
 			if (resolved != null) {
-				try {
-					replacement = makeType(resolved, local.type, false);
-					if (!decomponent) init.resolvedType = replacement.resolveType(scope);
-				} catch (Exception e) {
-					// Some type thing failed.
+				if (resolved.getClass().getSimpleName().startsWith("IntersectionTypeBinding")) {
+					// We intentionally deconstruct these into simply 'Object', because picking an arbitrary type amongst the intersection feels worse.
+				} else {
+					try {
+						replacement = makeType(resolved, local.type, false);
+						if (!decomponent) init.resolvedType = replacement.resolveType(scope);
+					} catch (Exception e) {
+						// Some type thing failed.
+					}
 				}
 			}
 		}
diff --git a/src/utils/lombok/javac/JavacTreeMaker.java b/src/utils/lombok/javac/JavacTreeMaker.java
index 83d9c53f..84293f11 100644
--- a/src/utils/lombok/javac/JavacTreeMaker.java
+++ b/src/utils/lombok/javac/JavacTreeMaker.java
@@ -441,7 +441,11 @@ public class JavacTreeMaker {
 	//javac versions: 6-8
 	private static final MethodId<JCVariableDecl> VarDef = MethodId("VarDef");
 	public JCVariableDecl VarDef(JCModifiers mods, Name name, JCExpression vartype, JCExpression init) {
-		return invoke(VarDef, mods, name, vartype, init);
+		JCVariableDecl varDef = invoke(VarDef, mods, name, vartype, init);
+		// We use 'position of the type is -1' as indicator in delombok that the original node was written using JDK10's 'var' feature, because javac desugars 'var' to the real type and doesn't leave any markers other than the
+		// node position to indicate that it did so. Unfortunately, that means vardecls we generate look like 'var' to delombok. Adjust the position to avoid this.
+		if (varDef.vartype != null && varDef.vartype.pos == -1) varDef.vartype.pos = 0;
+		return varDef;
 	}
 	
 	//javac versions: 8
diff --git a/src/utils/lombok/permit/Permit.java b/src/utils/lombok/permit/Permit.java
index 9f0434b8..b7c5f0d9 100644
--- a/src/utils/lombok/permit/Permit.java
+++ b/src/utils/lombok/permit/Permit.java
@@ -46,8 +46,7 @@ public class Permit {
 		Throwable ex;
 		
 		try {
-			f = AccessibleObject.class.getDeclaredField("override");
-			g = UNSAFE.objectFieldOffset(f);
+			g = getOverrideFieldOffset();
 			ex = null;
 		} catch (Throwable t) {
 			f = null;
@@ -74,6 +73,30 @@ public class Permit {
 		return accessor;
 	}
 	
+	private static long getOverrideFieldOffset() throws Throwable {
+		Field f = null;
+		Throwable saved = null;
+		try {
+			f = AccessibleObject.class.getDeclaredField("override");
+		} catch (Throwable t) {
+			saved = t;
+		}
+		
+		if (f != null) {
+			return UNSAFE.objectFieldOffset(f);
+		}
+		// The below seems very risky, but for all AccessibleObjects in java today it does work, and starting with JDK12, making the field accessible is no longer possible.
+		try {
+			return UNSAFE.objectFieldOffset(Fake.class.getDeclaredField("override"));
+		} catch (Throwable t) {
+			throw saved;
+		}
+	}
+	
+	static class Fake {
+		boolean override;
+	}
+	
 	public static Method getMethod(Class<?> c, String mName, Class<?>... parameterTypes) throws NoSuchMethodException {
 		Method m = null;
 		Class<?> oc = c;
diff --git a/test/core/src/lombok/DirectoryRunner.java b/test/core/src/lombok/DirectoryRunner.java
index ea15cdb9..9410b4c7 100644
--- a/test/core/src/lombok/DirectoryRunner.java
+++ b/test/core/src/lombok/DirectoryRunner.java
@@ -91,7 +91,7 @@ public class DirectoryRunner extends Runner {
 	public DirectoryRunner(Class<?> testClass) throws Exception {
 		description = Description.createSuiteDescription(testClass);
 		
-		this.params = (TestParams) testClass.newInstance();
+		this.params = (TestParams) testClass.getConstructor().newInstance();
 		
 		Throwable error = null;
 		try {
diff --git a/test/pretty/resource/after/Java11Var.javva b/test/pretty/resource/after/Java11Var.java
index cec4be6d..cec4be6d 100644
--- a/test/pretty/resource/after/Java11Var.javva
+++ b/test/pretty/resource/after/Java11Var.java
diff --git a/test/pretty/resource/after/Switch11.java b/test/pretty/resource/after/Switch11.java
new file mode 100644
index 00000000..d24012a2
--- /dev/null
+++ b/test/pretty/resource/after/Switch11.java
@@ -0,0 +1,11 @@
+public class Switch11 {
+	public void basic() {
+		switch (5) {
+		case 1: 
+		case 2: 
+			System.out.println("OK");
+			break;
+		default: 
+		}
+	}
+}
diff --git a/test/pretty/resource/after/Switch12.java b/test/pretty/resource/after/Switch12.java
new file mode 100644
index 00000000..89825223
--- /dev/null
+++ b/test/pretty/resource/after/Switch12.java
@@ -0,0 +1,28 @@
+public class Switch12 {
+	public void basic() {
+		switch (5) {
+		case 1: 
+		case 2: 
+			System.out.println("OK");
+			break;
+		default: 
+		}
+	}
+	public void multiCase() {
+		switch (5) {
+		case 1, 2: 
+			System.out.println("OK");
+		default: 
+		}
+	}
+
+	public int switchExpr() {
+		return switch (5) {
+		case 1, 2 -> 0;
+		case 3 -> {
+			break 10;
+		}
+		default -> 10;
+		} + 10;
+	}
+}
diff --git a/test/pretty/resource/before/Switch11.java b/test/pretty/resource/before/Switch11.java
new file mode 100644
index 00000000..556631f0
--- /dev/null
+++ b/test/pretty/resource/before/Switch11.java
@@ -0,0 +1,12 @@
+// version :11
+public class Switch11 {
+	public void basic() {
+		switch (5) {
+		case 1:
+		case 2:
+			System.out.println("OK");
+			break;
+		default:
+		}
+	}
+}
diff --git a/test/pretty/resource/before/Switch12.java b/test/pretty/resource/before/Switch12.java
new file mode 100644
index 00000000..f1bd8a79
--- /dev/null
+++ b/test/pretty/resource/before/Switch12.java
@@ -0,0 +1,30 @@
+// version 12:
+public class Switch12 {
+	public void basic() {
+		switch (5) {
+		case 1:
+		case 2:
+			System.out.println("OK");
+			break;
+		default:
+		}
+	}
+
+	public void multiCase() {
+		switch (5) {
+		case 1, 2:
+			System.out.println("OK");
+		default:
+		}
+	}
+
+	public int switchExpr() {
+		return switch (5) {
+		case 1, 2 -> 0;
+		case 3 -> {
+			break 10;
+		}
+		default -> 10;
+		} + 10;
+	}	
+}
diff --git a/website/extra/htaccess b/website/extra/htaccess
index e7b54de4..d2c7a292 100644
--- a/website/extra/htaccess
+++ b/website/extra/htaccess
@@ -67,3 +67,7 @@ RewriteRule ^features/experimental/index(\.html)?/?$ /features/experimental/all
 RewriteRule ^features/experimental/${pg?no_esc}$ /features/experimental/${pg?no_esc}.html [L,END]
 RewriteRule ^features/experimental/${pg?no_esc}(\.html)?/?$ /features/experimental/${pg?no_esc} [NC,R=301]
 </#list>
+
+RewriteRule ^presentations/7lessons$ /presentations/7lessons.html [L,END]
+RewriteRule ^presentations/7lessons(\.html)?/?$ /presentations/7lessons [NC,R=301]
+RewriteRule ^presentations/7mistakes(\.html)?/?$ /presentations/7lessons [NC,R=301]
diff --git a/website/resources/js/main.js b/website/resources/js/main.js
index 5608a3c3..eaaf2df5 100644
--- a/website/resources/js/main.js
+++ b/website/resources/js/main.js
@@ -94,7 +94,23 @@
 		});
 	}
 	
+	function seekVideo() {
+		var t = window.location.hash;
+		if (!t) return;
+		var s = /^#?(?:(\d\d?):)?(\d\d?):(\d\d?)$/.exec(t);
+		if (!s) return;
+		var videoj = $("#presentationVideo");
+		if (!videoj || videoj.length == 0) return;
+		var video = videoj[0];
+		var h = parseInt(s[1]);
+		if (!h) h = 0;
+		var m = parseInt(s[2]);
+		var s = parseInt(s[3]);
+		video.currentTime = (((h * 60) + m) * 60) + s;
+	}
+	
 	$(ajaxFeaturePages);
 	$(clickToTap);
 	$(clickForVideo);
+	$(seekVideo);
 })($);
diff --git a/website/templates/credits.html b/website/templates/credits.html
index 3390d762..b5c033ad 100644
--- a/website/templates/credits.html
+++ b/website/templates/credits.html
@@ -29,6 +29,8 @@
 						</li><li>
 							<strong>Tor Norbye</strong>, <strong>Jan Lahoda</strong>, and <strong>Petr Jiricka</strong> for helping out with Netbeans internals and/or javac.
 						</li><li>
+							<strong>nqzero</strong> for the <a href="https://github.com/nqzero/permit-reflect">permit-reflect</a> library, whose ideas are also used in lombok.
+						</li><li>
 							All contributors who submitted patches or helped answering questions!</li>
 					</ul>
 
diff --git a/website/templates/main.html b/website/templates/main.html
index fc925d61..03073436 100644
--- a/website/templates/main.html
+++ b/website/templates/main.html
@@ -25,7 +25,7 @@
 			</video>
 			<div class="row">
 				<div class="text-center">
-					<a href="http://jnb.ociweb.com/jnb/jnbJan2010.html">Show me a text and images based explanation and tutorial instead!</a>
+					<a href="https://objectcomputing.com/resources/publications/sett/january-2010-reducing-boilerplate-code-with-project-lombok">Show me a text and images based explanation and tutorial instead!</a>
 				</div>
 			</div>
 		</div>
diff --git a/website/templates/presentations/7lessons.html b/website/templates/presentations/7lessons.html
new file mode 100644
index 00000000..3027fbad
--- /dev/null
+++ b/website/templates/presentations/7lessons.html
@@ -0,0 +1,25 @@
+<#import "../_scaffold.html" as main>
+<@main.scaffold>
+	<div class="page-header top5">
+		<div class="row text-center">
+			<@main.h1 title="The 7 biggest mistakes we made in Project Lombok" />
+			<p>
+				A presentation by Lombok's 2 core authors: Roel Spilker and Reinier Zwitserloot.<br />
+				We talk about the 7 biggest mistakes we made managing an open source project for the past 10 years.<br />
+				First given at <a href="https://programm.javaland.eu/2019/#/scheduledEvent/579921">Javaland (in Brühl, Germany) on March 19th, 2019</a>. Total length: 40 minutes.
+			</p>
+		</div>
+		<div class="video text-center">
+			<video id="presentationVideo" width="640" height="360" poster="/presentations/7lessons-poster.jpg" controls="controls" preload="none">
+				<source src="https://projectlombok.org/presentations/7lessons-vp9.webm" type="video/webm" />
+				<source src="https://projectlombok.org/presentations/7lessons.webm" type="video/webm" />
+				<source src="https://projectlombok.org/presentations/7lessons.mp4" type="video/mp4" />
+				<@main.h1 title="Can't watch the video?" />
+					<p>
+					You can download it and watch it with, for example, <a href="https://www.videolan.org/vlc/index.html">The open source VLC media player</a>:<br />
+					<a href="/videos/7lessons.mp4">Download: 7 biggest mistakes we made in Project Lombok</a>
+				</p>
+			</video>
+		</div>
+	</div>
+</@main.scaffold>