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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.<init>(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 test.main(test.java:66)