JSON Jackson Infinite Recursion Error Java

Question

I have seen this error solved with many questions in the past with 2 objects which reference each other, but I can't seem to solve it using these techniques referenced (using this line, mainly):

@JsonIgnoreProperties("day")

My issue is that I have 3 objects which have something of a love triangle going on. Here is (some) of the error:

com.fasterxml.jackson.databind.JsonMappingException: Infinite recursion (StackOverflowError) 
(through reference chain: java.util.ArrayList[0]->DataObjects.EmployeeShiftAllocation["shift"]->
DataObjects.Shift["day"]->DataObjects.Day["employeeShiftAllocations"]->
java.util.ArrayList[0]->DataObjects.EmployeeShiftAllocation["shift"]->DataObjects.Shift["day"]->......... etc

So I have an object EmployeeShiftAllocation, which references a Shift, which references a Day, which has a list of EmployeeShiftAllocations.

I applied the aforementioned suggested solution, but it did not solve the problem. I placed that statement before the declaration / initialization of the 3 aforementioned objects.

Any help is appreciated.

I tried solution #3 here, and figured #1 and #2 have too many downsides. mkyong.com/java/how-to-convert-java-object-to-from-json-jackson — Ken Reid
– Ken Reid, Commented Sep 8, 2017 at 17:59

Amer Qarabsa · Accepted Answer · 2017-09-08 18:04:39Z

2

you can try using @JsonIdentityInfo which will create a reference for hibernate in the second level of serialization which will break the cycle

@Entity
@JsonIdentityInfo(generator=ObjectIdGenerators.UUIDGenerator.class, property="@id")

answered Sep 8, 2017 at 18:04

Amer Qarabsa

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4 Comments

Ken Reid Over a year ago

Thanks for your answer. What is the purpose of the @Entity tag? I see it's likely used with a JPA, but I've never used JPAs before. Could you recommend a way forward using your answer with a JPA?

Amer Qarabsa Over a year ago

@Entity is used with jpa , it specify your model to be an entity and mapped by a table in the database, the annotations I shared should be placed above the name of your class you are facing the problem serializing

Ken Reid Over a year ago

So I added EclipseLink JAR to my buildpath to allow use of JPA stuff, but my @Entity tag is still not being recognised. "Entity cannot be resolved to a type".

Ken Reid Over a year ago

I found I was missing a JAR. I still have the same problem with your answer sadly Amer.

Ken Reid · Accepted Answer · 2017-09-15 10:37:09Z

1

Managed to fix the issue by using

@JsonIgnore

From the EclipseLink JPA, on the Shift object. This caused the recursive loop to break, solving the issue.

answered Sep 15, 2017 at 10:37

Ken Reid

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