spring boot - how to avoid “Failed to instantiate [java.util.List]: Specified class is an interface” in HTTP controller handler?

Question

In my spring boot REST API application, I need to handle HTTP POST by accepting a strongly-typed list as my input:

@RestController
public class CusttableControll         


        

Answer 1

For me I had made a typo accidentally wrapping a class in a list. Removing the typo allowed serialization to happen correctly via spring data rest + jackson.

List<MyClass> a; // typo
MyClass = a;// fix

Answer 2

Try to add RequestBody annotation to your method definition

@RequestMapping(value="/custtable/update", method=RequestMethod.POST)
@ResponseBody
public String updateCusttableRecords(@RequestBody List<Custtable> customers) {
    //Method body 
}