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This exception has no message.
java.lang.ClassCastException: 	at com.sun.enterprise.resource.IASNonSharedResourcePool.setConfigurationParameters(IASNonSharedResourcePool.java:268)	at com.sun.enterprise.resource.IASNonSharedResourcePool.(IASNonSharedResourcePool.java:250)	at com.sun.enterprise.resource.PoolManagerImpl.getResourceFromPool(PoolManagerImpl.java:221)	at com.sun.enterprise.resource.PoolManagerImpl.getResource(PoolManagerImpl.java:170)	at com.sun.enterprise.resource.JdbcDataSource.internalGetConnection(JdbcDataSource.java:241)	at com.sun.enterprise.resource.JdbcDataSource.getConnection(JdbcDataSource.java:124)	at trs.common.session.ConnectionSessionBean.getConnection(ConnectionSessionBean.java:116)	at trs.common.session.ConnectionSessionBean_EJBObjectImpl.getConnection(ConnectionSessionBean_EJBObjectImpl.java:32)	at trs.common.session._ConnectionSession_Stub.getConnection(Unknown Source)	at trs.member.entity.AccountTypeEJB.getConnection(AccountTypeEJB.java:264)	at trs.member.entity.AccountTypeEJB.ejbFindAccountType(AccountTypeEJB.java:217)	at trs.member.entity.AccountTypeEJB_RemoteHomeImpl.findAccountType(AccountTypeEJB_RemoteHomeImpl.java:124)	at trs.member.entity._AccountTypeHome_Stub.findAccountType(Unknown Source)	at undefined.TestAccount.testit(TestAccount.java:28)	at undefined.TestAccountType.processRequest(TestAccountType.java:44)	at undefined.TestAccountType.doGet(TestAccountType.java:64)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)	at org.apache.catalina.core.StandardWrapperValve.invokeServletService(StandardWrapperValve.java:720)	at org.apache.catalina.core.StandardWrapperValve.access$000(StandardWrapperValve.java:118)	at org.apache.catalina.core.StandardWrapperValve$1.run(StandardWrapperValve.java:278)	at java.security.AccessController.doPrivileged(Native Method)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:274)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:505)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:212)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:505)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:203)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:505)	at com.iplanet.ias.web.connector.nsapi.NSAPIProcessor.process(NSAPIProcessor.java:158)	at com.iplanet.ias.web.WebContainer.service(WebContainer.java:856)