Encrypting the admin password is strongly encouraged. For more information, see Chapter 8, "Configuring Security," in Sun Java System Application Server Platform Edition 9 Administration Guide.
To change the admin password using the Admin Console, follow this procedure.
Expand the Configuration node.
Expand the Security node.
Expand the Realms node.
Select the admin-realm node.
Click the Manage Users button from the Edit Realm page.
Select the user named admin.
Enter the new password and confirm the password.
Click Save to save or click Close to close without saving.