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Apex webservice error - Cricular graph object detected

Hi everyone,


I developped an Apex webservice class which return a complex type. Webservice is called by Java code. All my Apex tests run fine but then when Java code get this error :


"Circular Object Graph detected during serialization, you can not have circular object references in an Apex WebService response."


I have no idea where does it comes from :


- Java development environment configuration

- Apex code

- Data serialization return from my class. My complex type I return contains list.


Please help.