problem in deploy EJB .jar file in weblogic server5.1

[charis Lin]

there are the error massage when start the weblogic server:
-��++� ��+- 28 10:50:48 GMT+08:00 2001:<I> <RMI> Registry started
-��++� ��+- 28 10:50:48 GMT+08:00 2001:<I> <EJB> Enterprise JavaBeans initializi
ng
-��++� ��+- 28 10:50:53 GMT+08:00 2001:<E> <EJB> Could not deploy: 'd:/weblogic/
myserver/OrderLineItemEnterpriseBean.jar'
Possible reasons include:
1. The bean or an interface class has been modified but
the deployment descriptor has not been updated
2. The database mappings in the deployment descriptor do not
match the database definition
3. The jar file is not a valid jar file
4. The jar file does not contain a valid bean
weblogic.ejb.common.DeploymentException: Could not setup the persistence store f
or this bean.; nested exception is:
weblogic.cmp.rdbms.ConnectionPoolException: Could not open connection po
ol named 'ProductPool'. Cannot deploy CMP Entity Bean.
weblogic.cmp.rdbms.ConnectionPoolException: Could not open connection pool named
'ProductPool'. Cannot deploy CMP Entity Bean.
at weblogic.cmp.rdbms.PSRdbms_Base.columnIsInTable(PSRdbms_Base.java:271
)
at weblogic.cmp.rdbms.PSRdbms_Base.columnsAreInTable(PSRdbms_Base.java,
Compiled Code)
at weblogic.cmp.rdbms.PSRdbms_Base.baseSetup(PSRdbms_Base.java:123)
at com.FedEx.ecshop.entity.order.CustomerOrderEJBPSWebLogic_CMP_RDBMS.se
tup(CustomerOrderEJBPSWebLogic_CMP_RDBMS.java:299)
at com.FedEx.ecshop.entity.order.CustomerOrderEJBPSWebLogic_CMP_RDBMS.se
tup(CustomerOrderEJBPSWebLogic_CMP_RDBMS.java:289)
at weblogic.ejb.internal.StatefulEJBHome.initializeEntityEjbStore(Statef
ulEJBHome.java:462)
at weblogic.ejb.internal.StatefulEJBHome.setup(StatefulEJBHome.java:294)
at weblogic.ejb.internal.EJBHomeImpl.setup(EJBHomeImpl.java:625)
at weblogic.ejb.internal.EJBDeploymentImpl.setupBeanHome(EJBDeploymentIm
pl.java:580)
at weblogic.ejb.internal.EJBDeploymentImpl.deployBeans(EJBDeploymentImpl
.java, Compiled Code)
at weblogic.ejb.internal.EJBDeploymentImpl.deploy(EJBDeploymentImpl.java
:335)
at weblogic.ejb.internal.EJBJarDeployment.deploy(EJBJarDeployment.java:2
31)
at weblogic.ejb.internal.EJBManagerImpl.deploy(EJBManagerImpl.java, Comp
iled Code)
at weblogic.ejb.internal.EJBManagerImpl.deployNew(EJBManagerImpl.java:34
9)
at weblogic.ejb.internal.EJBManagerImpl.deploy(EJBManagerImpl.java:316)
at weblogic.ejb.internal.EJBManagerImpl.deployBeans(EJBManagerImpl.java,
Compiled Code)
at weblogic.ejb.internal.EJBManagerImpl.<init>(EJBManagerImpl.java:239)
at weblogic.t3.srvr.T3Srvr.start(T3Srvr.java, Compiled Code)
at weblogic.t3.srvr.T3Srvr.main(T3Srvr.java:827)
at java.lang.reflect.Method.invoke(Native Method)
at weblogic.Server.startServerDynamically(Server.java:99)
at weblogic.Server.main(Server.java:65)
at weblogic.Server.main(Server.java:55)
at weblogic.NTServiceHelper.run(NTServiceHelper.java:19)
at java.lang.Thread.run(Thread.java:479)