Update wsdl definition via API (Basic Authentication)

Hello,

I'm using the following code in my project in order to update wsdl definitions:

List<Interface> ifaces = wsdlProjectPro.getInterfaceList();
 for (Interface iface : ifaces) {
  if (iface instanceof WsdlInterface) {
   WsdlInterface wsdlInterface = (WsdlInterface) iface;
   wsdlInterface.updateDefinition(url, false);
  }
 }

When my url is behind http Basic Authentication I can't access it and complete the operation above.
it terminates with the following exception:

ERROR [HttpMethodDirector] java.lang.NullPointerException at com.eviware.x.form.XFormFactory.createDialogBuilder(XFormFactory.java:19) at com.eviware.soapui.impl.wsdl.support.wsdl.UrlWsdlLoader$WsdlCredentialsProvider.buildBasicDialog(UrlWsdlLoader.java:329) at com.eviware.soapui.impl.wsdl.support.wsdl.UrlWsdlLoader$WsdlCredentialsProvider.access$400(UrlWsdlLoader.java:246) at com.eviware.soapui.impl.wsdl.support.wsdl.UrlWsdlLoader$WsdlCredentialsProvider$ShowDialog.run(UrlWsdlLoader.java:360) at com.eviware.soapui.support.swing.SwingUtils.runInUIThreadIfSWT(SwingUtils.java:37) at com.eviware.soapui.impl.wsdl.support.wsdl.UrlWsdlLoader$WsdlCredentialsProvider.getCredentials(UrlWsdlLoader.java:306) at org.apache.commons.httpclient.HttpMethodDirector.promptForCredentials(HttpMethodDirector.java:867) at org.apache.commons.httpclient.HttpMethodDirector.processWWWAuthChallenge(HttpMethodDirector.java:732) at org.apache.commons.httpclient.HttpMethodDirector.processAuthenticationResponse(HttpMethodDirector.java:668) at org.apache.commons.httpclient.HttpMethodDirector.executeMethod(HttpMethodDirector.java:193) at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:397) at com.eviware.soapui.impl.wsdl.support.wsdl.UrlWsdlLoader$LoaderWorker.construct(UrlWsdlLoader.java:210) at com.eviware.soapui.impl.wsdl.support.wsdl.UrlWsdlLoader.load(UrlWsdlLoader.java:124) at com.eviware.soapui.impl.wsdl.support.wsdl.WsdlLoader.loadXmlObject(WsdlLoader.java:108) at com.eviware.soapui.impl.wsdl.support.xsd.SchemaUtils.getDefinitionParts(SchemaUtils.java:470) at com.eviware.soapui.impl.wsdl.support.xsd.SchemaUtils.getDefinitionParts(SchemaUtils.java:460) at com.eviware.soapui.impl.support.definition.support.AbstractDefinitionCache.update(AbstractDefinitionCache.java:94) at com.eviware.soapui.impl.support.definition.support.AbstractDefinitionContext$Loader.construct(AbstractDefinitionContext.java:219) at com.eviware.soapui.support.swing.SwingWorkerDelegator.construct(SwingWorkerDelegator.java:45) at com.eviware.soapui.support.swing.SwingWorker$2.run(SwingWorker.java:111) at java.lang.Thread.run(Unknown Source)

Is there a way to provide it the credentials through the api?
I got the same results when tried to update definitions with a url in the following format: https://[user]:[pass]@[path]?WSDL

Thanks,
Chen.