Accessing assets via ajax

[enrico sodacci, modifié il y a 13 années.]

Hello everybody,
i'm new to Liferay and i'm trying to get assets via alloy's ajax facilities like this:

Liferay.Service.Asset.AssetEntry.getEntries({
   entryQuery: {},
   serviceParameterTypes: A.JSON.stringify(['com.liferay.portlet.asset.service.persistence.AssetEntryQuery'])
   },
   function(message) {
   	console.debug(message);
	var exception = message.exception;
        if (!exception) {
	   console.debug(message);
	}
	else {
	   console.debug(exception);
	}
});

but i receive this json response:

{"exception":"java.lang.NullPointerException"}

and this message in logfile:

Unsupported parameter type for class class com.liferay.portlet.asset.service.AssetEntryServiceUtil, method getEntries, parameter entryQuery, and type com.liferay.portlet.asset.service.persistence.AssetEntryQuery

How am i supposed to pass a valid AssetEntryQuery object from the client's js? I've tried to give some values to the entryQuery parameter without any success.

Thank you.