AxisFault occurs when I run the AddAdGroup example in v201101

AxisFault faultCode: {http://schemas.xmlsoap.org/soap/envelope/}Server.userException faultSubcode: faultString: javax.net.ssl.SSLKeyException: RSA premaster secret error faultActor: faultNode: faultDetail: {http://xml.apache.org/axis/}stackTrace:javax.net.ssl.SSLKeyException: RSA premast

javax.xml.rpc.ServiceException: Arguments to addParameter(String, String) cannot be null

I write a very simple program in using google-adwords api, as follows: AdWordsUser user = new AdWordsUser(); CampaignServiceInterface campaignService = user.getValidationService(AdWordsService.V201101.CAMPAIGN_SERVICE); But it always throw an exception no matter which service I get, java