ORA-01001: invalid cursor

using oracle below document but not working plsql and java code.

How to Return a JDBC ResultSet as a REF CURSOR From a Java Stored Procedure (Doc ID 150448.1)

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[oracle@xxxxxx1] xxxxxxx]$ cat sqlExecution.java

import java.sql.*;

import oracle.jdbc.*;

import java.util.Properties;

import oracle.jdbc.pool.OracleDataSource;

public class sqlExecution  {

        public static ResultSet selectSqlExecution(String dbServiceName, String mySql)

        {

                                ResultSet rset = null;

                try

                {

                Connection dbConn = makeConnection(dbServiceName);

                                ((OracleConnection)dbConn).setCreateStatementAsRefCursor(true);

                Statement stmt = dbConn.createStatement();

                rset = stmt.executeQuery (mySql);

                }

                catch(Exception e)

                {

                        System.out.println(e.getMessage());

                }

                                return rset;

        }

                public static Connection makeConnection (String dbServiceName) throws Exception

                        {

                                        Class.forName ("oracle.jdbc.driver.OracleDriver");