and need to consume it to retrieve the data in a Java client, but really don't know how to handle the SSL certificate and authentication, could anyone please help here?
it depends what Java API you use to process HTTP requests/responses. Your XS OData service is protected with FORM based authentication I suppose. So, if you would choose Apache HTTP, then please have a look on the example "Form based logon" by the following link https://hc.apache.org/httpcomponents-client-ga/examples.html
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