ORABPEL START-UP ERROR!!!!!!!! - Connection Pool Deployment failure

I have installed BPEL Process Manager with Weblogic 8.1SP4.
I am using Oracle Database 9.2.0.5.0 for Oracle BPEL Process
Manager installation.
Also i have made following changes for JDBC thin driver accordingly.

<JDBCConnectionPool CapacityIncrement="2"
DriverName="oracle.jdbc.OracleDriver"
MaxCapacity="15" LoginDelaySeconds="1"
Name="BPELServerPool"
ShrinkPeriodMinutes="15"
ShrinkingEnabled="true" SupportsLocalTransaction="true"
Targets="orabpelServer"
URL="jdbc:oracle:thin:orabpel/orabpel_password@hostname:port:database_servoce_
name"/>

I m getting following error while starting the server :-

Connection Pool "BPELServerPool" deployment failed with the following error: 0:Could not create pool connection. The DBMS driver exception was: invalid arguments in call.

Also I m getting following error during startup

ORABPEL-04076

Cannot lookup jdbc datasource.
The process domain was unable to lookup the TX datasource "BPELServerDataSourceWorkflow".
Please check that the machine hosting the datasource is physically connected to the network. Additionally check that the connection pool properties as defined in the application server startup properties are valid.
at com.collaxa.cube.engine.data.ConnectionFactory$ConnectionFactoryImpl.init(ConnectionFactory.java:268)
at com.collaxa.cube.engine.data.ConnectionFactory.update(ConnectionFactory.java:54)
at com.collaxa.cube.engine.data.ConnectionFactory.init(ConnectionFactory.java:42)
at com.collaxa.cube.admin.data.ServerConnectionFactory.init(ServerConnectionFactory.java:34)
at com.collaxa.cube.admin.adaptors.ServerAdaptorManager.init(ServerAdaptorManager.java:66)
at com.collaxa.cube.admin.ServerManager.__init(ServerManager.java:211)
at com.collaxa.cube.admin.ServerManager.init(ServerManager.java:99)
at com.collaxa.cube.ejb.impl.ServerBean.init(ServerBean.java:200)
at com.collaxa.cube.ejb.impl.ServerBean_g9inc6_EOImpl.init(ServerBean_g9inc6_EOImpl.java:856)
at com.collaxa.cube.admin.CXLoaderServlet.init(CXLoaderServlet.java:62)
at javax.servlet.GenericServlet.init(GenericServlet.java:258)
at weblogic.servlet.internal.ServletStubImpl$ServletInitAction.run(ServletStubImpl.java:1028)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:121)
at weblogic.servlet.internal.ServletStubImpl.createServlet(ServletStubImpl.java:904)
at weblogic.servlet.internal.ServletStubImpl.createInstances(ServletStubImpl.java:883)
at weblogic.servlet.internal.ServletStubImpl.prepareServlet(ServletStubImpl.java:822)
at weblogic.servlet.internal.WebAppServletContext.preloadServlet(WebAppServletContext.java:3333)
at weblogic.servlet.internal.WebAppServletContext.preloadServlets(WebAppServletContext.java:3278)
at weblogic.servlet.internal.WebAppServletContext.preloadResources(WebAppServletContext.java:3259)
at weblogic.servlet.internal.WebAppServletContext.setStarted(WebAppServletContext.java:5949)
at weblogic.servlet.internal.WebAppModule.start(WebAppModule.java:862)
at weblogic.j2ee.J2EEApplicationContainer.start(J2EEApplicationContainer.java:2127)
at weblogic.j2ee.J2EEApplicationContainer.activate(J2EEApplicationContainer.java:2168)
at weblogic.j2ee.J2EEApplicationContainer.activate(J2EEApplicationContainer.java:2115)
at weblogic.management.deploy.slave.SlaveDeployer$Application.setActivation(SlaveDeployer.java:3082)
at weblogic.management.deploy.slave.SlaveDeployer.setActivationStateForAllApplications(SlaveDeployer.java:1751)
at weblogic.management.deploy.slave.SlaveDeployer.resume(SlaveDeployer.java:359)
at weblogic.management.deploy.DeploymentManagerServerLifeCycleImpl.resume(DeploymentManagerServerLifeCycleImpl.java:229)
at weblogic.t3.srvr.SubsystemManager.resume(SubsystemManager.java:131)
at weblogic.t3.srvr.T3Srvr.resume(T3Srvr.java:966)
at weblogic.t3.srvr.T3Srvr.run(T3Srvr.java:361)
at weblogic.Server.main(Server.java:32)
<Error> <HTTP> <BEA-101216> <Servlet: "cxloader" failed to preload on startup in Web application: "startup".
javax.servlet.ServletException:
ORABPEL START-UP ERROR!!!!!!!!

Can Anyone kindly suggest what is the problem ?