title: STS unable to find certification
body: <p>I have downloaded the latest version of spring tool suite (STS 3.6.2), when I tried to import spring getting started content, it return as below error:</p>
  
  <p>Get started Guide
  SunCertPathBuilderException: unable to find valid certification path to requested target</p>
  
  <p>I have setup the proxy to visit internet, but I don't know how to import certifications in STS.
  Please help.
  Thanks.</p>
  
  <p>James</p>