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Io exception: The Network Adapter could not establish the connection
java.sql.SQLException: Io exception: The Network Adapter could not establish the
connection	at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:189)	at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:231)	at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:345)	at oracle.jdbc.driver.OracleConnection.(OracleConnection.java:431)	at oracle.jdbc.driver.OracleDriver.getConnectionInstance(OracleDriver.java:515)	at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:345)	at java.sql.DriverManager.getConnection(DriverManager.java:512)	at java.sql.DriverManager.getConnection(DriverManager.java:171)	at conn2.main(conn2.java:18)