java.lang.ClassCastException: This exception has no message.

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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 jspbookch7.Controller.init(Controller.java:34)
at javax.servlet.GenericServlet.init(GenericServlet.java:258)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:921)
at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:658)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:229)
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 com.iplanet.ias.web.connector.nsapi.NSAPIProcessor.process(NSAPIProcessor.java:157)
at com.iplanet.ias.web.WebContainer.service(WebContainer.java:598)

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