This problem was already discussed in Add support for AES-GCM for TLS in Java 7

You need to use an external library provided by Bouncy Castle in order to get access to AES-GCM cipher in handshake. The required library is bctls-jdk15to18-1.80.jar that contains all the stuff related to SSL and BouncyCastleJSSEProvider but it's probably you need also to add bcprov-jdk15to18-1.80.jar, and bcutil-jdk15to18-1.80.jar because of dependencies ( version jdk15to18-1.80 is the last one for Java 7)

Please, take a look to this comment https://stackoverflow.com/a/79497587/3815921