问SAP DBTech JDBC:无法连接到jdbc:sap://192.168.33.114:39015/ [SAP DBTech JDBC：[2]：一般错误: SYSTEMDB未连接]

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import java.sql.Connection;
import java.sql.ResultSet;

public class SapConnection {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        try {
        Class.forName("com.sap.db.jdbc.Driver");

        String url = "jdbc:sap://192.168.33.114:39015/?databaseName=abcd";
        String user = "abc";
        String password = "xyz";

        Connection cn = java.sql.DriverManager.getConnection(url, user, password);

        // ... do whatever with the results ...
        }
        catch (Exception e) {
            e.printStackTrace();
        }
    }
}