https に http プロトコル でアクセスすると SSL 通信をするようにとエラーが返る。「400 Bad Request」「You’re speaking plain HTTP to an SSL-enabled server port.」「Instead use the HTTPS scheme to access this URL, please.」
"I recently had a SSLPeerUnverifiedException show up sporadically in an app on 11.0.2, along with an occasional SSLException: No PSK available. Unable to resume. failure. The latter seems to be from a known bug in JDK 11.0.2. When I updated to 11.0.4, both problems disappeared."
"The cacerts keystore will be populated with a set of root certificates issued by the CAs of Oracle's Java SE Root CA Program. As a prerequisite, each CA must sign the Oracle Contributor Agreement (OCA), or an equivalent agreement, to grant Oracle the right to open-source their certificates."