JAAS Control Flags
If a security realm has multiple Authentication providers configured, the 
Control Flag attribute on the Authenticator provider determines the ordered 
execution of the Authentication providers. The values for the Control Flag 
attribute are as follows:

REQUIRED -- This LoginModule must succeed. Even if it fails, authentication 
proceeds down the list of LoginModules for the configured Authentication 
providers. This setting is the default. 

REQUISITE -- This LoginModule must succeed. If other Authentication providers 
are configured and this LoginModule succeeds, authentication proceeds down the 
list of LoginModules. Otherwise, return control to the application. 

SUFFICIENT --This LoginModule needs not succeed. If it does succeed, return 
control to the application. If it fails and other Authentication providers are 
configured, authentication proceeds down the LoginModule list. 

OPTIONAL --The user is allowed to pass or fail the authentication test of this 
Authentication providers. However, if all Authentication providers configured 
in a security realm have the JAAS Control Flag set to OPTIONAL, the user must 
pass the authentication test of one of the configured providers. 


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