How to use custom storage type for liferay 7 forms? -

i following tutorial creating advanced forms, not able understand how use external database storing form data.

i cant find tutorial concept. using liferay 7 ce. tutorial says

developers can implement own storage types if json not desirable. if do, option appear here in form settings. see tutorial on custom storage types (not yet written) more information.

my question service-wrapper use, cant understand how know service being used forms.

you can change storage type when creating new form in form settings. json type default can create new storageadapterto create additional types.

have @ jsonstorageadapter inspiration how develop custom one. should enough create bundle put new class in. extend basestorageadapter , implement new necessary methods.

the new class picked after deployment , should new option in form settings.