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java.sql.SQLException: E/A-Exception: The Network Adapter could
not establish the connection	at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java)	at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java)	at oracle.jdbc.driver.OracleConnection.(OracleConnection.java)	at oracle.jdbc.driver.OracleDriver.getConnectionInstance(OracleDriver.java)	at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java)	at java.sql.DriverManager.getConnection(DriverManager.java:517)	at java.sql.DriverManager.getConnection(DriverManager.java:177)	at JDBCVersion.main(JDBCVersion.java:23)