title: PKIX path building failed: wso2 oauth
body: <p>I am running the sample of playground2 from wso2 this <a href="http://wso2.com/library/articles/2014/02/securing-your-web-service-with-oauth2-using-wso2-identity-server-1/" rel="nofollow">post</a>, I am getting following error when I am submitting the form for Get Access Token</p>
  
  <blockquote>
    <p>javax.net.ssl.SSLHandshakeException:
    sun.security.validator.ValidatorException: PKIX path building failed:
    sun.security.provider.certpath.SunCertPathBuilderException: unable to
    find valid certification path to requested target</p>
  </blockquote>