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java.sql.SQLException: Io exception: The Network Adapter could not establish the connection	at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:114)	at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:156)	at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:269)	at oracle.jdbc.driver.OracleConnection.(OracleConnection.java:212)	at oracle.jdbc.driver.OracleDriver.getConnectionInstance(OracleDriver.java:251)	at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:224)	at java.sql.DriverManager.getConnection(DriverManager.java:512)	at java.sql.DriverManager.getConnection(DriverManager.java:171)	at oracle.jdbc.pool.OracleDataSource.getConnection(OracleDataSource.java:102)	at oracle.jdbc.pool.OracleDataSource.getConnection(OracleDataSource.java:85)	at undefined.test.main(test.java:66)