### Question:
ByteBufSerializer extends JsonSerializer<ByteBuf> { @Override public Class<ByteBuf> handledType() { return ByteBuf.class; }  @Override Class<ByteBuf> handledType(); @Override void serializeWithType(ByteBuf byteBuf, JsonGenerator gen, SerializerProvider serializers, TypeSerializer typeSer); @Override void serialize(ByteBuf byteBuf, JsonGenerator gen, SerializerProvider serializers);  }### Answer:
@Test public void handledTypeIsByteBuf() { ByteBufSerializer serializer = new ByteBufSerializer(); Class handledType = serializer.handledType(); assertEquals(ByteBuf.class, handledType); }