Jackson deserialiser affected by the Deadbolt "restrict" annotation - jackson

Question

I receiving an exception Could not resolve type id 'path.to.MyClass' as a subtype of [simple type, class java.lang.Object]: no such class found on play 2.7 server with DeadBolt (2.6.3 and 2.7.0) when I try deserialise JSON to Map<String, MyClass> inside of route action with a #Restrict annotation. All works fine if Remove this annotation.
MyClass.java
#JsonTypeInfo(use = JsonTypeInfo.Id.CLASS, property = "class")
public class MyClass implements Serializable {
public String name;
public Integer age;
public MyClass(){}
public MyClass(String name, Integer age){
this.name = name;
this.age = age;
}
}
serialise Map<String, MyClass>
Map<String, MyClass> value = new HashMap<>();
value.put("first", new MyClass("Bob",10));
value.put("second", new MyClass("Rob",20));
ObjectMapper mapper = Json.newDefaultMapper();
mapper.enableDefaultTypingAsProperty(ObjectMapper.DefaultTyping.OBJECT_AND_NON_CONCRETE, "class");
String json = null;
try {
json = mapper.writeValueAsString(value);
} catch (JsonProcessingException e) {
e.printStackTrace();
}
output
{
"first":{
"class":"path.to.MyClass",
"name":"Bob",
"age":10
},
"second":{
"class":"path.to.MyClass",
"name":"Rob",
"age":20
}
}
JSON format looks so because of backward compatibility with old server which use old FlexJson.
deserialise
#Restrict({#Group({"Admin"})})
public CompletionStage<Result> action(long id) {
String json = getJsonFromStorage();
Map<String, MyClass> result = new HashMap<>();
try {
ObjectMapper mapper = new ObjectMapper();
mapper.enableDefaultTypingAsProperty(ObjectMapper.DefaultTyping.OBJECT_AND_NON_CONCRETE, "class");
JsonFactory factory = mapper.getFactory();
JsonParser parser = factory.createParser(new ByteArrayInputStream(json.getBytes(Charset.forName("UTF-8"))));
JavaType type = mapper.getTypeFactory().constructType(result.getClass());
t = mapper.readValue(parser, type);
} catch (IOException e) {
e.printStackTrace();
}
return ok("ok")
}

Answer 1

I have a temporary solution. I override class loader for current thread to class loader from play.Environment
public class MyController extends Controller {
#Inject
private Environment environment;
#Restrict({#Group({"Admin"})})
public CompletionStage<Result> action(long id) {
Thread.currentThread().setContextClassLoader(environment.classLoader());
String json = getJsonFromStorage();
Map<String, MyClass> result = new HashMap<>();
try {
ObjectMapper mapper = new ObjectMapper();
mapper.enableDefaultTypingAsProperty(ObjectMapper.DefaultTyping.OBJECT_AND_NON_CONCRETE, "class");
JsonFactory factory = mapper.getFactory();
JsonParser parser = factory.createParser(new ByteArrayInputStream(json.getBytes(Charset.forName("UTF-8"))));
JavaType type = mapper.getTypeFactory().constructType(result.getClass());
t = mapper.readValue(parser, type);
} catch (IOException e) {
e.printStackTrace();
}
return ok("ok")
}
}