You could try the asadmin create-password-alias command. The domain.xml is updated with the aliased password.
asadmin create-password-alias --port 4848 --user admin --passwordfile /opt/password.txt oracle-alias
The domain.xml is updated like :
<property name="password" value="${ALIAS=oracle-alias}"/> for the corresponding pool.
password.txt contents :
AS_ADMIN_PASSWORD=adminadmin (the password needed to start the domain or the administrative password)
AS_ADMIN_ALIASPASSWORD=mypassword (password that you need to encrypt ex:the database password that is stored in clear as of now in domain.xml that you want it replaced with alias)
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