core/src/main/java/org/springframework/security/authentication/jaas/DefaultJaasAuthenticationProvider.java
@Override
	protected LoginContext createLoginContext(CallbackHandler handler)
			throws LoginException {
		return new LoginContext(getLoginContextName(), null, handler, getConfiguration());
	}
@Override
	protected LoginContext createLoginContext(CallbackHandler handler)
			throws LoginException {
		return new LoginContext(getLoginContextName(), null, handler, getConfiguration());
	}
Creates a LoginContext using the Configuration that was specified in
{@link #setConfiguration(Configuration)}.