REST Problem - Could not write JSON document - Infinite recursion (StackOverflowError)

awjamesfrj · September 29, 2017, 1:00am

Hi,

My project attached.

My goal is to create a complete customized controller CRUD REST API.

I have created a Page entity and Repository / Service / Controller layers.

After start the application, using Postman I have added a value like this:

POST http://localhost:8080/app/rest/v2/entities/arc$Page
Body below
{
“_entityName”: “arc$Page”,
“id”: “1”,
“pageableType”: “PageableType_01”,
“name”: “Page_01”,
“theme”: “Theme_01”,
“pageableId”: 1
}

It works when I use this GET
http://localhost:8080/app/rest/v2/entities/arc$Page

But when I use my customized GET
http://localhost:8080/app/rest/pages/

the error below happens:


20:42:32.653 WARN  o.s.w.s.m.s.DefaultHandlerExceptionResolver - Failed to write HTTP message: org.springframework.http.converter.HttpMessageNotWritableException: Could not write JSON document: Infinite recursion (StackOverflowError) (through reference chain: com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.m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ava.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["model"]->com.haulmont.chile.core.model.impl.MetaModelImpl["classByName"]->java.util.Collections$UnmodifiableMap["arc$Page"]->com.haulmont.chile.core.model.impl.MetaClassImpl["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arc.zip (30.1K)

gorbunkov · October 2, 2017, 7:32am

Hi, the problem here is that Entity in the platform is a very complex object and has a lot of system attributes. Default jackson serializer, that is used when you just return an object from the controller, cannot handle it.
You have two options here:

Do like we did for the standard rest api - operate with strings, not the object. So we get json as a string argument and return the string when the method result is an entity. Take a look at the com.haulmont.restapi.controllers.EntitiesController class. Serialization and deserialization is done with the help of the com.haulmont.cuba.core.app.serialization.EntitySerializationAPI.
Use not the entities, but simple POJOs as DTOs. In this case, you can safely return it from the controller methods, pass it as method arguments, you’ll just need to implement the conversion between the POJO and platform entity.

About the URL, you can create your own Spring MVC dispatcher context with its own prefix. In the web.xml file of the web module take a look at how rest_api or dispatcher servlets are registered.

awjamesfrj · October 3, 2017, 2:04am

Thank you for your reply Max!
Can you put what you said in a small example ?
I have changed the url-patterns in the web.xml but it did not work.
Can you show me what you said in a project using DTOs / JSON serialization ?
Best,
James

gorbunkov · October 4, 2017, 3:59pm

Hi,
There is a project attached. Take a look at the com.company.rs.myapi.MyCustomController. It returns a list of entities by the requests http://localhost:8080/app/rest/myapi/books and http://localhost:8080/app/rest/myapi/books2
Two methods in the controller demonstrate two approaches I mentioned above.

rest-sample.zip (28.9K)

awjamesfrj · October 4, 2017, 10:52pm

Thanks a lot for clarifying Max!

Using Cuba would I be able to create requests like this http://localhost:8080/app/myapi/books (removing the rest) or http://localhost:8080/books (removing app/api) ? You said I could do it changing web.xml but I tried without success.

Can you send me a web.xml file with an example as well ?

Thanks a lot again