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All the restrictions from above lead to the fact that service providers are very lightweight compared to real services, but the usage is also more restricted. A good example for a service provider is JEAF’s support for persistence. This is implemented a service provider (JEAF Persistence).
Interceptor
Interceptors are special objects that will be called before and after a call to a service. Based on interceptors it’s for example possible to ensure that service methods are only called if the current user has a matching authorization.