diff --git a/org.eclipse.jdt.core.tests.model/src/org/eclipse/jdt/core/tests/dom/ASTTest.java b/org.eclipse.jdt.core.tests.model/src/org/eclipse/jdt/core/tests/dom/ASTTest.java
index ad348282fb0..2fbedeebd8d 100644
--- a/org.eclipse.jdt.core.tests.model/src/org/eclipse/jdt/core/tests/dom/ASTTest.java
+++ b/org.eclipse.jdt.core.tests.model/src/org/eclipse/jdt/core/tests/dom/ASTTest.java
@@ -1323,12 +1323,11 @@ private static int getApiLevel(String s) {
 		if (s == null)
 			return AST.JLS12;
 		switch (s) {
-		case JavaCore.VERSION_1_2 : return AST.JLS2;
-        case JavaCore.VERSION_1_3: return AST.JLS3;
-        case JavaCore.VERSION_1_4: return AST.JLS4;
-        case JavaCore.VERSION_1_5: return AST.JLS4;
-        case JavaCore.VERSION_1_6: return AST.JLS4;
-        case JavaCore.VERSION_1_7: return AST.JLS4;
+		case JavaCore.VERSION_1_2 : return AST.JLS8;
+        case JavaCore.VERSION_1_3: return AST.JLS8;
+        case JavaCore.VERSION_1_4: return AST.JLS8;
+        case JavaCore.VERSION_1_5: return AST.JLS8;
+        case JavaCore.VERSION_1_6: return AST.JLS8;
         case JavaCore.VERSION_1_8: return AST.JLS8;
         case JavaCore.VERSION_9: return AST.JLS9;
         case JavaCore.VERSION_10: return AST.JLS10;
@@ -1342,7 +1341,7 @@ private static int getApiLevel(String s) {
         case JavaCore.VERSION_18: return AST.JLS18;
         case JavaCore.VERSION_19: return AST.JLS19;
         case JavaCore.VERSION_20: return AST.JLS20;
-        default:  return AST.JLS2;
+        default:  return AST.JLS8;
 		}
 	}
 	/** @deprecated using deprecated code */
@@ -1355,7 +1354,7 @@ public void testAST() {
 		int apiLevelCal = ASTTest.getApiLevel(JavaCore.getDefaultOptions().get(JavaCore.COMPILER_SOURCE));
 		assertTrue(a0.apiLevel() == apiLevelCal);
 		AST a1 = new AST(new HashMap()); // deprecated, but still 2.0
-		assertTrue(a1.apiLevel() == AST.JLS2);
+		assertEquals(AST.JLS8,a1.apiLevel());
 		AST a2 = AST.newAST(AST.JLS2, false);
 		assertTrue(a2.apiLevel() == AST.JLS2);
 		AST a3 = AST.newAST(JLS3_INTERNAL, false);
diff --git a/org.eclipse.jdt.core/dom/org/eclipse/jdt/core/dom/AST.java b/org.eclipse.jdt.core/dom/org/eclipse/jdt/core/dom/AST.java
index fddc84e74f8..4aa80c87317 100644
--- a/org.eclipse.jdt.core/dom/org/eclipse/jdt/core/dom/AST.java
+++ b/org.eclipse.jdt.core/dom/org/eclipse/jdt/core/dom/AST.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2000, 2024 IBM Corporation and others.
+ * Copyright (c) 2000, 2025 IBM Corporation and others.
  *
  * This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License 2.0
@@ -1229,22 +1229,8 @@ public AST(Map options) {
 		this(apiLevelMap.get(options.get(JavaCore.COMPILER_SOURCE)),
 				JavaCore.ENABLED.equals(options.get(JavaCore.COMPILER_PB_ENABLE_PREVIEW_FEATURES)));
 
-		long sourceLevel;
-		long complianceLevel;
-		switch(this.apiLevel) {
-			case JLS2_INTERNAL :
-			case JLS3_INTERNAL :
-				sourceLevel = ClassFileConstants.JDK1_3;
-				complianceLevel = ClassFileConstants.JDK1_5;
-				break;
-			case JLS4_INTERNAL :
-				sourceLevel = ClassFileConstants.JDK1_7;
-				complianceLevel = ClassFileConstants.JDK1_7;
-				break;
-			default :
-				sourceLevel = AST.jdkLevelMap.get(options.get(JavaCore.COMPILER_SOURCE));
-				complianceLevel = sourceLevel;
-		}
+		long sourceLevel = AST.jdkLevelMap.get(options.get(JavaCore.COMPILER_SOURCE));
+		long complianceLevel = sourceLevel;
 		this.scanner = new Scanner(
 			true /*comment*/,
 			true /*whitespace*/,
@@ -1259,13 +1245,13 @@ public AST(Map options) {
 
 	private static Map<String, Long> getLevelMapTable() {
         Map<String, Long> t = new HashMap<>();
-        t.put(null, ClassFileConstants.JDK1_2);
-        t.put(JavaCore.VERSION_1_2, ClassFileConstants.JDK1_2);
-        t.put(JavaCore.VERSION_1_3, ClassFileConstants.JDK1_3);
-        t.put(JavaCore.VERSION_1_4, ClassFileConstants.JDK1_4);
-        t.put(JavaCore.VERSION_1_5, ClassFileConstants.JDK1_5);
-        t.put(JavaCore.VERSION_1_6, ClassFileConstants.JDK1_6);
-        t.put(JavaCore.VERSION_1_7, ClassFileConstants.JDK1_7);
+        t.put(null, ClassFileConstants.JDK1_8);
+        t.put(JavaCore.VERSION_1_2, ClassFileConstants.JDK1_8);
+        t.put(JavaCore.VERSION_1_3, ClassFileConstants.JDK1_8);
+        t.put(JavaCore.VERSION_1_4, ClassFileConstants.JDK1_8);
+        t.put(JavaCore.VERSION_1_5, ClassFileConstants.JDK1_8);
+        t.put(JavaCore.VERSION_1_6, ClassFileConstants.JDK1_8);
+        t.put(JavaCore.VERSION_1_7, ClassFileConstants.JDK1_8);
         t.put(JavaCore.VERSION_1_8, ClassFileConstants.JDK1_8);
         t.put(JavaCore.VERSION_9, ClassFileConstants.JDK9);
         t.put(JavaCore.VERSION_10, ClassFileConstants.JDK10);
@@ -1286,13 +1272,13 @@ private static Map<String, Long> getLevelMapTable() {
 	}
 	private static Map<String, Integer> getApiLevelMapTable() {
         Map<String, Integer> t = new HashMap<>();
-        t.put(null, JLS2_INTERNAL);
-        t.put(JavaCore.VERSION_1_2, JLS2_INTERNAL);
-        t.put(JavaCore.VERSION_1_3, JLS3_INTERNAL);
-        t.put(JavaCore.VERSION_1_4, JLS4_INTERNAL);
-        t.put(JavaCore.VERSION_1_5, JLS4_INTERNAL);
-        t.put(JavaCore.VERSION_1_6, JLS4_INTERNAL);
-        t.put(JavaCore.VERSION_1_7, JLS4_INTERNAL);
+        t.put(null, JLS8_INTERNAL);
+        t.put(JavaCore.VERSION_1_2, JLS8_INTERNAL);
+        t.put(JavaCore.VERSION_1_3, JLS8_INTERNAL);
+        t.put(JavaCore.VERSION_1_4, JLS8_INTERNAL);
+        t.put(JavaCore.VERSION_1_5, JLS8_INTERNAL);
+        t.put(JavaCore.VERSION_1_6, JLS8_INTERNAL);
+        t.put(JavaCore.VERSION_1_7, JLS8_INTERNAL);
         t.put(JavaCore.VERSION_1_8, JLS8_INTERNAL);
         t.put(JavaCore.VERSION_9, JLS9_INTERNAL);
         t.put(JavaCore.VERSION_10, JLS10_INTERNAL);