com.microsoft.durabletask.DataConverter$DataConverterException in case of no default constructor

[YusukeTobo]

If no default constructor is generated by javac, the following deserializing warning raises in OrchestrationTrigger. The message is not clear for this library users.

WARNING: The orchestrator failed with an unhandled exception: com.microsoft.durabletask.DataConverter$DataConverterException: Failed to deserialize the JSON text to net.yutobo.durablefunc.Person.

Regarding the java debugger output, this warning is from the exception of Jackson.

InvalidDefinitionException@92 "com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot construct instance of `net.yutobo.durablefunc.Person` (no Creators, like default constructor, exist): cannot deserialize from Object value (no delegate- or property-based Creator)
 at [Source: (String)"{"name":"yusuke","age":30}"; line: 1, column: 2]"

Client Function

        Person person = new Person("foobar", 30);
        client.scheduleNewOrchestrationInstance("orchestrateSingleton", person, instanceID);

OrchestrationTrigger

return OrchestrationRunner.loadAndRun(runtimeState, ctx -> {

            Person person = ctx.getInput(Person.class); // com.microsoft.durabletask.DataConverter$DataConverterException
            context.getLogger().info(person.toString());

[kaibocai]

Hi @cgillum , I wonder what should be the fix here. Jackson cannot desterilized model that doesn't have an empty constructor and the model contains constructor with parameters which didn't annotated its parameters with @JsonProperty("field_name").

Should we update the exception message or should we write this restriction on our documents that when cx is using any class defined themselves them need to provide empty constructor?

[cgillum]

@kaibocai I think the first step is to make sure this additional error information is included in the exception we raise.

InvalidDefinitionException@92 "com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot construct instance of net.yutobo.durablefunc.Person (no Creators, like default constructor, exist): cannot deserialize from Object value (no delegate- or property-based Creator) at [Source: (String)"{"name":"yusuke","age":30}"; line: 1, column: 2]"

Then at least developers can understand what happened without needing to use the debugger.