Change the password of DEV_MDS and DEV_BIPLATFORM and then restart the biserver services.
alter user DEV_MDS identified by password
alter user DEV_BIPLATFORM identified by password
password will be the earlier password given to those users.
Try to change in boot.properties file.
The user name and password in the boot.properties will be as in form of encrypted.
Change it to weblogic and Admin123
Change in 3 locations.
Under User_project folder
restart the service