Fixes

Signed-off-by: Ivan Malygin <ivan@swirldslabs.com>

Author: imalygin

pbj-core/pbj-compiler/src/main/java/com/hedera/pbj/compiler/impl/generators/TestGenerator.java

@@ -410,8 +410,8 @@ public void testTestEqualsAndHashCode() throws Exception {
                 @Test
                 public void testCodecGetDefaultValueMethod(){
                     final var codec = $modelClassName.PROTOBUF;
-                    final var codecDefaultValue = codec.getDefaultValue();
-                    assertEquals($modelClassName.DEFAULT, codecDefaultValue);
+                    final var codecDefaultInstance = codec.getDefaultInstance();
+                    assertEquals($modelClassName.DEFAULT, codecDefaultInstance);
                 }
                 """
                 .replace("$modelClassName",modelClassName)

pbj-core/pbj-compiler/src/main/java/com/hedera/pbj/compiler/impl/generators/protobuf/CodecDefaultInstanceMethodGenerator.java

@@ -15,8 +15,9 @@ static String generateGetDefaultInstanceMethod(String modelClassName) {
              *
              * @return The default value for the model class
              */
+            @Override
             public $modelClass getDefaultInstance() {
-                return $modelClass.getDefaultInstance();
+                return $modelClass.DEFAULT;
             }
             """
                 .replace("$modelClass", modelClassName)

pbj-core/pbj-runtime/src/main/java/com/hedera/pbj/runtime/Codec.java

@@ -182,4 +182,11 @@ default Bytes toBytes(@NonNull T item) {
         }
         return Bytes.wrap(bytes);
     }
+
+    /**
+     * Get the default value for the model class.
+     *
+     * @return The default value for the model class
+     */
+    T getDefaultInstance();
 }

pbj-core/pbj-runtime/src/main/java/com/hedera/pbj/runtime/JsonCodec.java

@@ -125,4 +125,9 @@ default int measureRecord(T item) {
     default boolean fastEquals(@NonNull T item, @NonNull ReadableSequentialData input) throws ParseException {
         return Objects.equals(item, parse(input));
     }
+
+    @Override
+    default T getDefaultInstance() {
+        return null;
+    }
 }

pbj-core/pbj-runtime/src/test/java/com/hedera/pbj/runtime/CodecWrapper.java

@@ -47,4 +47,9 @@ public int measureRecord(T item) {
     public boolean fastEquals(@NonNull T item, @NonNull ReadableSequentialData input) throws ParseException {
         throw new UnsupportedOperationException();
     }
+
+    @Override
+    public T getDefaultInstance() {
+        throw new UnsupportedOperationException();
+    }
 }

pbj-core/pbj-runtime/src/test/java/com/hedera/pbj/runtime/ProtoParserToolsTest.java

@@ -531,5 +531,10 @@ public boolean fastEquals(@NonNull TestMessage item, @NonNull ReadableSequential
                 throws ParseException {
             throw new UnsupportedOperationException();
         }
+
+        @Override
+        public TestMessage getDefaultInstance() {
+            throw new UnsupportedOperationException();
+        }
     }
 }