I am using the following code for serialization:
public class JsonTransformer implements ResponseTransformer {
private Gson gson = new Gson();
@Override
public String render(Object model) {
GsonBuilder gsonBuilder = new GsonBuilder();
return gson.toJson(model);
}
}
I get error:
java.lang.UnsupportedOperationException: Attempted to serialize java.lang.Class: com.soul.seeker.models.Post. Forgot to register a type adapter?
How do I serialize a list a return it in the below code?
get("/data_on_page_load", "application/json", (Request request, Response response) -> {
List<Post> list = Post.findAll();
return list;
}, new JsonTransformer());
pojo class:
public class Post extends Model{
private String title;
private String details;
private String username;
private String userImage;
private String url;
private List categories;
//Getters and Setters removed for brevity
}
update:
When I tried to use it the below way:
public class JsonTransformer implements ResponseTransformer {
private Gson gson = new Gson();
@Override
public String render(Object model) {
GsonBuilder gsonBuilder = new GsonBuilder();
gson = gsonBuilder.registerTypeAdapterFactory(new ClassTypeAdapterFactory()).create();
return gson.toJson(model);
}
}
public class ClassTypeAdapterFactory implements TypeAdapterFactory {
@Override
public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> typeToken) {
if(!Class.class.isAssignableFrom(typeToken.getRawType())) {
return null;
}
return (TypeAdapter<T>) new ClassTypeAdapter();
}
}
it returns unnecessary information in json object when I pass it back to client side:
Array[2]
0:Object
attributes:Object
cachedChildren:Object
cachedParents:Object
compositeKeyPersisted:false
dirtyAttributeNames:Array[0]
errors:Object
frozen:false
manageTime:true
metaModelLocal:Object
modelRegistryLocal:Object
__proto__:
Object1:Object
length:2
__proto__:Array[0]
It makes sense that ClassTypeAdapter is where I have modify the code to return proper list object as json and exclude irrelevant information, but I am still new to serialization.
