6 files changed, 44 insertions, 6 deletions
diff --git a/src/core/lombok/eclipse/handlers/HandleVal.java b/src/core/lombok/eclipse/handlers/HandleVal.java
index ac53e27e..0f70e66d 100644
--- a/src/core/lombok/eclipse/handlers/HandleVal.java
+++ b/src/core/lombok/eclipse/handlers/HandleVal.java
@@ -22,12 +22,14 @@
 package lombok.eclipse.handlers;
 
 import static lombok.core.handlers.HandlerUtil.handleFlagUsage;
-import static lombok.eclipse.handlers.EclipseHandlerUtil.typeMatches;
+import static lombok.eclipse.handlers.EclipseHandlerUtil.*;
+
 import lombok.ConfigurationKeys;
 import lombok.val;
 import lombok.var;
 import lombok.core.HandlerPriority;
 import lombok.eclipse.DeferUntilPostDiet;
+import lombok.eclipse.Eclipse;
 import lombok.eclipse.EclipseASTAdapter;
 import lombok.eclipse.EclipseASTVisitor;
 import lombok.eclipse.EclipseNode;
@@ -39,10 +41,13 @@ import org.eclipse.jdt.internal.compiler.ast.ForStatement;
 import org.eclipse.jdt.internal.compiler.ast.ForeachStatement;
 import org.eclipse.jdt.internal.compiler.ast.LocalDeclaration;
 import org.eclipse.jdt.internal.compiler.ast.NullLiteral;
+import org.eclipse.jdt.internal.compiler.ast.SingleTypeReference;
 import org.eclipse.jdt.internal.compiler.ast.TypeReference;
+import org.eclipse.jdt.internal.compiler.classfmt.ClassFileConstants;
 
 /*
- * This class just handles 3 basic error cases. The real meat of eclipse 'val' support is in {@code PatchVal} and {@code PatchValEclipse}.
+ * Java 1-9: This class just handles 3 basic error cases. The real meat of eclipse 'val' support is in {@code PatchVal} and {@code PatchValEclipse}.
+ * Java 10+: Lombok uses the native 'var' support and transforms 'val' to 'final var'.
  */
 @Provides(EclipseASTVisitor.class)
 @DeferUntilPostDiet
@@ -96,5 +101,16 @@ public class HandleVal extends EclipseASTAdapter {
 			localNode.addError("variable initializer is 'null'");
 			return;
 		}
+		
+		// For Java >= 10 we use native support
+		if (localNode.getSourceVersion() >= 10) {
+			if (isVal) {
+				TypeReference originalType = local.type;
+				local.type = new SingleTypeReference("var".toCharArray(), Eclipse.pos(local.type));
+				local.modifiers |= ClassFileConstants.AccFinal;
+				local.annotations = addAnnotation(local.type, local.annotations, originalType.getTypeName());
+			}
+			return;
+		}
 	}
 }
diff --git a/src/core/lombok/javac/JavacAST.java b/src/core/lombok/javac/JavacAST.java
index f58de60f..0919c7d4 100644
--- a/src/core/lombok/javac/JavacAST.java
+++ b/src/core/lombok/javac/JavacAST.java
@@ -228,7 +228,7 @@ public class JavacAST extends AST<JavacAST, JavacNode, JCTree> {
 			int underscoreIdx = nm.indexOf('_');
 			if (underscoreIdx > -1) return Integer.parseInt(nm.substring(underscoreIdx + 1));
 			// assume java9+
-			return Integer.parseInt(nm);
+			return Integer.parseInt(nm.substring(3));
 		} catch (Exception ignore) {}
 		return 6;
 	}
diff --git a/src/core/lombok/javac/handlers/HandleVal.java b/src/core/lombok/javac/handlers/HandleVal.java
index 0ed831ab..d4fb1027 100644
--- a/src/core/lombok/javac/handlers/HandleVal.java
+++ b/src/core/lombok/javac/handlers/HandleVal.java
@@ -115,6 +115,12 @@ public class HandleVal extends JavacASTAdapter {
 			local.mods.annotations = local.mods.annotations == null ? List.of(valAnnotation) : local.mods.annotations.append(valAnnotation);
 		}
 		
+		if (localNode.getSourceVersion() >= 10) {
+			local.vartype = null;
+			localNode.getAst().setChanged();
+			return;
+		}
+		
 		if (JavacResolution.platformHasTargetTyping()) {
 			local.vartype = localNode.getAst().getTreeMaker().Ident(localNode.getAst().toName("___Lombok_VAL_Attrib__"));
 		} else {
diff --git a/src/eclipseAgent/lombok/eclipse/agent/PatchVal.java b/src/eclipseAgent/lombok/eclipse/agent/PatchVal.java
index 774e5b40..824ecefc 100644
--- a/src/eclipseAgent/lombok/eclipse/agent/PatchVal.java
+++ b/src/eclipseAgent/lombok/eclipse/agent/PatchVal.java
@@ -204,6 +204,8 @@ public class PatchVal {
 		boolean var = isVar(local, scope);
 		if (!(val || var)) return false;
 		
+		if (hasNativeVarSupport(scope)) return false;
+		
 		if (val) {
 			StackTraceElement[] st = new Throwable().getStackTrace();
 			for (int i = 0; i < st.length - 2 && i < 10; i++) {
@@ -281,6 +283,14 @@ public class PatchVal {
 		return is(local.type, scope, "lombok.val");
 	}
 	
+	private static boolean hasNativeVarSupport(Scope scope) {
+		long sl = scope.problemReporter().options.sourceLevel >> 16;
+		long cl = scope.problemReporter().options.complianceLevel >> 16;
+		if (sl == 0) sl = cl;
+		if (cl == 0) cl = sl;
+		return Math.min((int)(sl - 44), (int)(cl - 44)) >= 10;
+	}
+	
 	public static boolean handleValForForEach(ForeachStatement forEach, BlockScope scope) {
 		if (forEach.elementVariable == null) return false;
 		
@@ -288,6 +298,8 @@ public class PatchVal {
 		boolean var = isVar(forEach.elementVariable, scope);
 		if (!(val || var)) return false;
 		
+		if (hasNativeVarSupport(scope)) return false;
+		
 		TypeBinding component = getForEachComponentType(forEach.collection, scope);
 		if (component == null) return false;
 		TypeReference replacement = makeType(component, forEach.elementVariable.type, false);
diff --git a/src/utils/lombok/eclipse/Eclipse.java b/src/utils/lombok/eclipse/Eclipse.java
index 8af481b9..0f42ddc6 100644
--- a/src/utils/lombok/eclipse/Eclipse.java
+++ b/src/utils/lombok/eclipse/Eclipse.java
@@ -224,8 +224,11 @@ public class Eclipse {
 		int highestVersionSoFar = 0;
 		for (Field f : ClassFileConstants.class.getDeclaredFields()) {
 			try {
-				if (f.getName().startsWith("JDK1_")) {
-					int thisVersion = Integer.parseInt(f.getName().substring("JDK1_".length()));
+				if (f.getName().startsWith("JDK")) {
+					String versionString = f.getName().substring("JDK".length());
+					if (versionString.startsWith("1_")) versionString = versionString.substring("1_".length());
+					
+					int thisVersion = Integer.parseInt(versionString);
 					if (thisVersion > highestVersionSoFar) {
 						highestVersionSoFar = thisVersion;
 						latestEcjCompilerVersionConstantCached = (Long) f.get(null);
diff --git a/src/utils/lombok/javac/java8/CommentCollectingScannerFactory.java b/src/utils/lombok/javac/java8/CommentCollectingScannerFactory.java
index f29f501b..e625cd8d 100644
--- a/src/utils/lombok/javac/java8/CommentCollectingScannerFactory.java
+++ b/src/utils/lombok/javac/java8/CommentCollectingScannerFactory.java
@@ -21,6 +21,7 @@
  */
 package lombok.javac.java8;
 
+import java.nio.Buffer;
 import java.nio.CharBuffer;
 
 import com.sun.tools.javac.parser.Scanner;
@@ -79,7 +80,7 @@ public class CommentCollectingScannerFactory extends ScannerFactory {
 		int limit;
 		if (input instanceof CharBuffer && ((CharBuffer) input).hasArray()) {
 			CharBuffer cb = (CharBuffer) input;
-			cb.compact().flip();
+			((Buffer)cb.compact()).flip();
 			array = cb.array();
 			limit = cb.limit();
 		} else {