Explanation/Reference:
Note:
* When you configure multiple Authentication providers, use the JAAS Control Flag for each provider to control how the Authentication providers are used in the login sequence.
You can choose the following the JAAS Control Flag settings, among others:
REQUIRED-The Authentication provider is always called, and the user must always pass its

authentication test. Regardless of whether authentication succeeds or fails, authentication still continues down the list of providers.
SUFFICIENT-The user is not required to pass the authentication test of the Authentication provider. If

authentication succeeds, no subsequent Authentication providers are executed. If authentication fails, authentication continues down the list of providers.
OPTIONAL-The user is allowed to pass or fail the authentication test of this Authentication provider.

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.
* Example:
Setting the Order of Providers
Re-order the OAM Identity Asserter, OID Authenticator, and Default Authenticator by ensuring that the control flag for each authenticator is set as follows:
OAMAuthenticator (REQUIRED)

OracleInternetDirectoryAuthenticator (SUFFICIENT)

DefaultAuthenticator (SUFFICIENT)

Reference: Oracle Fusion Middleware Security Guide