BasicAcController.java

// Verify that the request for this Atlassian Connect Web Panel has
// a valid JWT token from the Host Product
@FilterWith(JwtFilter.class)
public Result sayHello(Context context) {
    // Get the tenant out of the Context (the tenant is provided by the JwtFilter)
    final Tenant tenant = (Tenant) context.getAttribute(JwtFilter.ATLASSIAN_CONNECT_TENANT_ATTR);

    // Pass the tenant baseUrl into the freemarker template as the variable productBaseUrl
    return Results.html().render("productBaseUrl", tenant.baseUrl);
}