Make Serializable and Memoized extensions work together.

The Serializable extension has to call the constructor of the AutoValue class as part of its implementation of `readResolve`. The class whose constructor is called must be the *final* one in the chain of subclasses generated by extensions. That is not necessarily the subclass generated by the Serializable extension.

RELNOTES=Fixed an issue when Serializable and Memoized extensions are used together.
PiperOrigin-RevId: 430458407

value/src/main/java/com/google/auto/value/extension/serializable/processor/SerializableAutoValueExtension.java

@@ -114,7 +114,9 @@ private static final class Generator {
               .collect(toImmutableList());
 
       TypeName classTypeName =
-          getClassTypeName(ClassName.get(context.packageName(), className), typeVariableNames);
+          getClassTypeName(
+              ClassName.get(context.packageName(), context.finalAutoValueClassName()),
+              typeVariableNames);
       this.proxyGenerator =
           new ProxyGenerator(
               classTypeName, typeVariableNames, propertyMirrors, buildSerializersMap());

value/src/test/java/com/google/auto/value/extension/serializable/processor/SerializableAutoValueExtensionTest.java

@@ -20,6 +20,7 @@
 import static org.junit.Assert.assertThrows;
 
 import com.google.auto.value.AutoValue;
+import com.google.auto.value.extension.memoized.Memoized;
 import com.google.auto.value.extension.serializable.SerializableAutoValue;
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableMap;
@@ -449,4 +450,48 @@ public void complexType() {
 
     assertThat(reserialized).isEqualTo(complexType);
   }
+
+  /**
+   * Type that uses both {@code @SerializableAutoValue} and {@code @Memoized}, showing that the two
+   * extensions work correctly together.
+   */
+  @SerializableAutoValue
+  @AutoValue
+  abstract static class SerializeMemoize implements Serializable {
+    abstract Optional<Integer> number();
+    private transient int methodCount;
+
+    @Memoized
+    Optional<Integer> negate() {
+      methodCount++;
+      return number().map(n -> -n);
+    }
+
+    static SerializeMemoize.Builder builder() {
+      return new AutoValue_SerializableAutoValueExtensionTest_SerializeMemoize.Builder();
+    }
+
+    @AutoValue.Builder
+    abstract static class Builder {
+      abstract Builder setNumber(Optional<Integer> number);
+      abstract SerializeMemoize build();
+    }
+  }
+
+  @Test
+  public void serializeMemoize() {
+    SerializeMemoize instance1 = SerializeMemoize.builder().setNumber(Optional.of(17)).build();
+    assertThat(instance1.methodCount).isEqualTo(0);
+    assertThat(instance1.negate()).hasValue(-17);
+    assertThat(instance1.methodCount).isEqualTo(1);
+    assertThat(instance1.negate()).hasValue(-17);
+    assertThat(instance1.methodCount).isEqualTo(1);
+    SerializeMemoize instance2 = SerializableTester.reserialize(instance1);
+    assertThat(instance2.methodCount).isEqualTo(0);
+    assertThat(instance2.negate()).hasValue(-17);
+    assertThat(instance2.methodCount).isEqualTo(1);
+    assertThat(instance2.negate()).hasValue(-17);
+    assertThat(instance2.methodCount).isEqualTo(1);
+
+  }
 }