Workaround.
After you apply Patch 3, the default minimum password length is 8 characters. However, to specify a different length for a different realm, run the following command:
./ssoadm set-realm-svc-attrs -u amadmin -f password-file -s sunIdentityRepositoryService -e realm-name -a sunIdRepoAttributeValidator= class=com.sun.identity.idm.server.IdRepoAttributeValidatorImpl sunIdRepoAttributeValidator=minimumPasswordLength=password-minimum-length