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java.sql.SQLException: Io exception: Unknown host specified	at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:112)	at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:146)	at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:255)	at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:387)	at oracle.jdbc.driver.PhysicalConnection.(PhysicalConnection.java:420)	at oracle.jdbc.driver.T4CConnection.(T4CConnection.java:165)	at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:35)	at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:801)	at org.apache.tomcat.dbcp.dbcp.DriverConnectionFactory.createConnection(DriverConnectionFactory.java:37)	at org.apache.tomcat.dbcp.dbcp.PoolableConnectionFactory.makeObject(PoolableConnectionFactory.java:290)	at org.apache.tomcat.dbcp.dbcp.BasicDataSource.validateConnectionFactory(BasicDataSource.java:877)	at org.apache.tomcat.dbcp.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:851)	at org.apache.tomcat.dbcp.dbcp.BasicDataSource.getConnection(BasicDataSource.java:540)	at uk.ac.hefce.sql.QueryUtil.getConnection(QueryUtil.java:51)	at uk.ac.hefce.cms.actions.HefceObjUtil.getConnection(HefceObjUtil.java:46)	at uk.ac.hefce.cms.actions.InitialiseAction.execute(InitialiseAction.java:36)	at uk.ac.hefce.cms.actions.LoginAction.execute(LoginAction.java:29)	at org.apache.struts.chain.commands.servlet.ExecuteAction.execute(ExecuteAction.java:53)	at org.apache.struts.chain.commands.AbstractExecuteAction.execute(AbstractExecuteAction.java:64)	at org.apache.struts.chain.commands.ActionCommandBase.execute(ActionCommandBase.java:48)	at org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:190)	at org.apache.commons.chain.generic.LookupCommand.execute(LookupCommand.java:304)	at org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:190)	at org.apache.struts.chain.ComposableRequestProcessor.process(ComposableRequestProcessor.java:280)	at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1858)	at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:459)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:709)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)	at org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:199)	at org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:282)	at org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:767)	at org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:697)	at org.apache.jk.common.ChannelSocket$SocketConnection.runIt(ChannelSocket.java:889)	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)	at java.lang.Thread.run(Unknown Source)