sun/security/ssl/DHKeyExchange/UseStrongDHSizes.java fails intermittently:

#section:main
----------messages:(5/298)----------
command: main -Djdk.tls.namedGroups=ffdhe8192 UseStrongDHSizes 8192
...
----------System.out:(61/5202)----------
Client died: 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
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
at java.base/sun.security.ssl.Alerts.getSSLException(Alerts.java:198)

...
at UseStrongDHSizes.runClientApplication(UseStrongDHSizes.java:108)
at SSLSocketTemplate.doClientSide(SSLSocketTemplate.java:343)
at SSLSocketTemplate.access$300(SSLSocketTemplate.java:68)
at SSLSocketTemplate$2.run(SSLSocketTemplate.java:819)
Caused by: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target