java7 TLS 1.2

Java 7 defaults to TLS 1.0, which many servers started rejecting around 2017-2018. If you’re running an older Java app and suddenly getting SSL handshake failures against a server you didn’t change, this is almost certainly the problem. The SSLContext approach is the cleanest fix when you control the connection code.

• Enable tls1.2 support via system parameter

$ java -Djdk.tls.client.protocols=TLSv1.2 

• Enable tls1.2 support via JAVA_OPTS

$ java -Djdk.tls.client.protocols=TLSv1.2 

$  JAVA_OPTS=$JAVA_OPTS -Djdk.tls.client.protocols=TLSv1.2  

• Via SSLContext

SSLContext sslContext = SSLContext.getInstance("TLSv1.2");
sslContext.init(null, null, null);
SSLContext.setDefault(sslContext);