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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:134)	at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:179)	at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:334)	at oracle.jdbc.driver.OracleConnection.(OracleConnection.java:418)	at oracle.jdbc.driver.OracleDriver.getConnectionInstance(OracleDriver.java:521)	at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:325)	at java.sql.DriverManager.getConnection(DriverManager.java:512)	at java.sql.DriverManager.getConnection(DriverManager.java:171)	at MyOracleConnection.main(MyOracleConnection.java:15)