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java.net.ConnectException: Connection refused: connect	at java.net.PlainSocketImpl.socketConnect(Native Method)	at java.net.PlainSocketImpl.doConnect(Unknown Source)	at java.net.PlainSocketImpl.connectToAddress(Unknown Source)	at java.net.PlainSocketImpl.connect(Unknown Source)	at java.net.SocksSocketImpl.connect(Unknown Source)	at java.net.Socket.connect(Unknown Source)	at oracle.net.nt.TcpNTAdapter.connect(TcpNTAdapter.java:150)	at oracle.net.nt.ConnOption.connect(ConnOption.java:133)	at oracle.net.nt.ConnStrategy.execute(ConnStrategy.java:370)	at oracle.net.resolver.AddrResolution.resolveAndExecute(AddrResolution.java:434)	at oracle.net.ns.NSProtocol.establishConnection(NSProtocol.java:687)	at oracle.net.ns.NSProtocol.connect(NSProtocol.java:247)	at oracle.jdbc.driver.T4CConnection.connect(T4CConnection.java:1102)	at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:320)	at oracle.jdbc.driver.PhysicalConnection.(PhysicalConnection.java:546)	at oracle.jdbc.driver.T4CConnection.(T4CConnection.java:236)	at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:32)	at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:521)	at java.sql.DriverManager.getConnection(Unknown Source)	at java.sql.DriverManager.getConnection(Unknown Source)	at oracle.ConnectJDBCOracle11g.main(ConnectJDBCOracle11g.java:25)