SSLHandshakeException means the Java client and the server could not agree on a TLS connection. Fix TLS version mismatches with jdk.tls.client.protocols, untrusted certificates with keytool, and find the rest with javax.net.debug.
In this spring boot example, learn to configure web application to run on SSL (HTTPS) with self-signed certificate. Also learn to create SSL cert, as well.
Bypass SSL certificate checking in Java only in local tests, and fix PKIX errors safely with a truststore, a trusted PEM certificate or Spring SSL bundles.
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