Access denied from java

I'm trying to connect to an instance SAP and

I'm receiving the error: com.sap.mw.jco.JCO$Exception: (103)

RFC_ERROR_LOGON_FAILURE: Name or password is incorrect. The user ID and

password is a valid SAP user ID as we are currently using it in the sap enviroment. Does anyone have any knowledge about this error?

Thanks!