Web service accepting array of object

I am new to JDev and ADF, we have requirement to build a web service which can receive array of object. Basically there is a Dot Net service which will read email account from exchange server and send all the read emails by consuming our web service. So the dot net program can send more than one email from the account and send to our web service. As of now we have created the web service which accepts the parameters like
@WebMethod
public String createHdaFile(@WebParam(name = "sender") String sender,
@WebParam(name = "primaryRecipient") String primaryRecipitant,
@WebParam(name = "secondaryRecipient") String secondaryRecipitant,
@WebParam(name = "subject") String subject,
@WebParam(name = "messageBody") String messageBody,
@WebParam(name = "attachmentName") String attachmentName
code ...
Want to know is there a way we can accept array of object which can receive all emails in one go.
Thanks,
Rajiv

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Web service accepting array of object

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