My Java program stopped sending emails using my gmail Account

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The key error is this:

Caused by: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target

See this JavaMail FAQ entry.

Since you’re connecting to Gmail, this shouldn’t happen. The most likely causes are:

  • There’s a firewall or anti-virus program intercepting your request.
  • There’s something wrong in your JDK installation preventing it from finding the trusted certificate authorities
  • You’re running in an application server that has overridden the JDK’s list of trusted certificate authorities

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