Apache Shiro's INI configuration is great for many use cases, but if you have the full power of an IoC framework like Spring or Guice, it is usually better to configure all of Shiro within the IoC mechanism directly. Shiro's Spring integration serves as a good example for this: http://shiro.apache.org/spring.html It is recommended to do something nearly identical for Guice environments.
I posted detailed answer to similar questoin that addresses usage of Guice provided realms.
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