private SecurityManager getSecurityManagerBean() {
        return getReflectionBuilder().getBean(SECURITY_MANAGER_NAME, SecurityManager.class);
    }
Creates a new instance.  See the {@link #getInstance()} JavaDoc for detailed explanation of how an INI
source will be resolved to use to build the instance.
core/src/main/java/org/apache/shiro/ini/IniSecurityManagerFactory.java