java.sql.SQLException: Io exception: The Network Adapter could not establish the connection

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java.sql.SQLException: Io exception: The Network Adapter could not establish the connection	at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:111)	at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:145)	at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:254)	at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:386)	at oracle.jdbc.driver.PhysicalConnection.(PhysicalConnection.java:413)	at oracle.jdbc.driver.T4CConnection.(T4CConnection.java:164)	at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:34)	at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:752)	at java.sql.DriverManager.getConnection(Unknown Source)	at java.sql.DriverManager.getConnection(Unknown Source)	at TestConnectionNew.main(TestConnectionNew.java:18)