Domínios Glassfish
Olhando para a documentação oficial, não parece que um aplicativo para um domínio possa obter acesso a outro espaço de domínio.
trecho
A domain is an administrative boundary that contains a group of GlassFish Server instances that are administered together. Each instance can belong to only one domain. A domain provides a preconfigured runtime for user applications. Each domain has its own configuration data, log files, and application deployment areas that are independent of other domains. If the configuration is changed for one domain, the configurations of other domains are not affected.
Domains enable different organizations and administrators to share securely a single GlassFish Server installation. Each organization or administrator can administer the instances in a single domain without affecting the instances in other domains.
At installation time, GlassFish Server creates a default domain that is named domain1. After installation, you can create additional domains as necessary.
When a domain is created, you are prompted for the administration user name and password. If you accept the default, the user admin is created without pass