Fix getClass on enum classes

platforms/core-configuration/model-core/build.gradle.kts

@@ -8,7 +8,6 @@ description = "Implementation of configuration model types and annotation metada
 errorprone {
     disabledChecks.addAll(
         "AnnotateFormatMethod", // 1 occurrence, needs errorprone annotations
-        "GetClassOnEnum", // 4 occurrences
         "ImmutableEnumChecker", // 1 occurrences
         "ReferenceEquality", // 3 occurrences
         "UndefinedEquals", // 2 occurrences

platforms/core-configuration/model-core/src/main/java/org/gradle/internal/snapshot/impl/EnumValueSnapshot.java

@@ -20,13 +20,15 @@
 import org.gradle.internal.snapshot.ValueSnapshot;
 import org.gradle.internal.snapshot.ValueSnapshotter;
 
+import javax.annotation.Nullable;
+
 public class EnumValueSnapshot implements ValueSnapshot {
     private final String className;
     private final String name;
 
     public EnumValueSnapshot(Enum<?> value) {
         // Don't retain the value, to allow ClassLoader to be collected
-        this.className = value.getClass().getName();
+        this.className = value.getDeclaringClass().getName();
         this.name = value.name();
     }
 
@@ -44,19 +46,17 @@ public String getName() {
     }
 
     @Override
-    public ValueSnapshot snapshot(Object value, ValueSnapshotter snapshotter) {
+    public ValueSnapshot snapshot(@Nullable Object value, ValueSnapshotter snapshotter) {
         if (isEqualEnum(value)) {
             return this;
         }
         return snapshotter.snapshot(value);
     }
 
-    private boolean isEqualEnum(Object value) {
-        if (value instanceof Enum) {
+    private boolean isEqualEnum(@Nullable Object value) {
+        if (value instanceof Enum<?>) {
             Enum<?> enumValue = (Enum<?>) value;
-            if (enumValue.name().equals(name) && enumValue.getClass().getName().equals(className)) {
-                return true;
-            }
+            return enumValue.name().equals(name) && enumValue.getDeclaringClass().getName().equals(className);
         }
         return false;
     }

platforms/core-configuration/model-core/src/main/java/org/gradle/internal/snapshot/impl/IsolatedEnumValueSnapshot.java

@@ -25,7 +25,7 @@
 /**
  * Isolates an Enum value and is a snapshot for that value.
  */
-public class IsolatedEnumValueSnapshot extends EnumValueSnapshot implements Isolatable<Enum> {
+public class IsolatedEnumValueSnapshot extends EnumValueSnapshot implements Isolatable<Enum<?>> {
     private final Enum<?> value;
 
     public IsolatedEnumValueSnapshot(Enum<?> value) {
@@ -43,17 +43,17 @@ public ValueSnapshot asSnapshot() {
     }
 
     @Override
-    public Enum isolate() {
+    public Enum<?> isolate() {
         return value;
     }
 
     @Nullable
     @Override
     public <S> S coerce(Class<S> type) {
-        if (type.isAssignableFrom(value.getClass())) {
+        if (type.isInstance(value)) {
             return type.cast(value);
         }
-        if (type.isEnum() && type.getName().equals(value.getClass().getName())) {
+        if (type.isEnum() && type.getName().equals(value.getDeclaringClass().getName())) {
             return type.cast(Enum.valueOf(Cast.uncheckedNonnullCast(type.asSubclass(Enum.class)), value.name()));
         }
         return null;

platforms/core-configuration/model-core/src/test/groovy/org/gradle/internal/snapshot/impl/Type1.groovy

@@ -17,5 +17,5 @@
 package org.gradle.internal.snapshot.impl
 
 enum Type1 {
-    ONE, TWO
+    ONE {}, TWO {}
 }

platforms/core-execution/workers/src/test/groovy/org/gradle/workers/internal/IsolatableSerializerRegistryTest.groovy

@@ -367,6 +367,6 @@ class IsolatableSerializerRegistryTest extends Specification {
     }
 
     enum EnumType {
-        FOO, BAR
+        FOO {}, BAR
     }
 }

subprojects/composite-builds/src/integTest/groovy/org/gradle/integtests/composite/CompositeBuildConfigurationAttributesResolveIntegrationTest.groovy

@@ -919,7 +919,7 @@ All of them match the consumer attributes:
                         com {
                             acme {
                                 'Flavor.groovy'('package com.acme; enum Flavor { free, paid }')
-                                'BuildType.groovy'('package com.acme; enum BuildType { debug, release }')
+                                'BuildType.groovy'('package com.acme; enum BuildType { debug {}, release {} }')
                                 'TypedAttributesPlugin.groovy'('''package com.acme
 
                                     import org.gradle.api.Plugin