Class path error in connection to jdbc system

Dear all,
I m trying to create a jdbc conection to access the a system "jdbc" in the portal database.I have included four jar files namely
Generic connector.jar
Helper.jar
Extended connector.jar
com.sap.portal.ivs.connectionserviceapi.jar
bt still i m getting a class path error.the error says
"The project was not built since its classpath is incomplete. Cannot find the class file for com.sap.portal.services.api.connectorgateway.IConnectorGatewayService."
Can anyone help me resolve this error.
Regards
Shaila

Hi Shila,
Actually Portal runs on Web Application server.The server does not know any details about R/3 system which you want to connect. for that first you have to configur Your J2ee Engine And than Proceed.
for configuring J2ee Engine see ths notes.
<a href="http://help.sap.com/saphelp_nw70/helpdata/en/93/8aea385252494d9b1eb92e0b7f1bad/content.htm">Notes</a>
and go through thease links it will be full to you...
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/6209b52e-0401-0010-6a9f-d40ec3a09424
http://help.sap.com/saphelp_nw04s/helpdata/en/5e/4d48b62fe54c23a8dbef364a289d8f/frameset.htm
http://help.sap.com/saphelp_nw04/helpdata/en/93/8aea385252494d9b1eb92e0b7f1bad/frameset.htm
Reward Points if Helpfull.
Regards
Vinit

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at java.lang.Class.getDeclaredConstructors0(Native Method)
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at java.lang.Class.getConstructor0(Unknown Source)
at java.lang.Class.newInstance0(Unknown Source)
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