active sandbox with example java client not working

I provisioned in the devnetsandbox.cisco.com new env successfully.

I modified your java example.

......

String siteName = "apidemoeu";  // WebEx site name
String xmlURL = "WBXService/XMLService";  // XML API URL
String siteID = <took it from WebexLab tab, "SiteID">
String partnerID = <took it from WebexLab tab, "PArtnerID">
String webExID = <set it with the email I opened new dynamic environment>
String password = <same, with the random password I gave to the environment>

......

Got response of "Incorrect user or password"

Where should I get the user and password from?

It should be the same credentials you can login directly to apidemoeu.webex.com through your browser with.