In the tomcat server.xml, please find:
<Connector port="8443" protocol="org.apache.coyote.http11.Http11NioProtocol" maxThreads="150" SSLEnabled="true" scheme="https" secure="true" keystoreFile="<path to keystore>" keystorePass="changeit" clientAuth="false" sslProtocol="TLS" />
Change:
sslProtocol="TLS" to sslProtocol="TLSv1.2"
And add:
sslEnabledProtocols="TLSv1.2"
So that it looks like:
<Connector port="8443" protocol="org.apache.coyote.http11.Http11NioProtocol" maxThreads="150" SSLEnabled="true" scheme="https" secure="true" keystoreFile="<path to keystore>" keystorePass="changeit" clientAuth="false" sslProtocol="TLSv1.2" sslEnabledProtocols="TLSv1.2" />
Then restart tomcat.