When running "ant runtest" in the webservice_proxy_security quickstart, the user gets this client-side-only exception:
Exception in thread "main" 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
The reason is due to JSSE behavior from keytool-generated certs, as explained here:
There is a simple workaround that users of the quickstart need to put in place, as described in the blog. This information should be expained in the quickstart's readme.txt file.