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java.sql.SQLException: E/A-Exception: The Network Adapter couldnot establish the connection at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java) at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java) at oracle.jdbc.driver.OracleConnection.<init>(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)