Error accessing file

[kavehmb2000]

Hi All,
I've been having some problem accessing a file.
Device: Nokia E71
Plot: I read some data from a file (if exists), process it, and replace the data with new one. if file does not exist, I create the file with new data.
Problem: When file does not exist, Program works - new file is created - and is accessible. but when I read (and as you notice in the code, close it after reading is finished), file is not accessible for writing. An exception is thrown saying "File is already in the use" when the file should be trunkated. What is your suggestion?

//...
import javax.microedition.io.*;
import javax.microedition.io.file.*;
import java.io.*;
import java.util.*;

public class myClass extends MIDlet implements CommandListener 
{
	public void ReadFile(String fileUrl)
    {
        String temp = System.getProperty("microedition.io.file.FileConnection.version");
        if ((temp!="")&&(temp!=null))
        {
            FileConnection fc = null;
            try
            {
                fc = (FileConnection)Connector.open(fileUrl, Connector.READ_WRITE);
                if(fc.exists()&&(fc != null))
                {
                    DataInputStream dis = fc.openDataInputStream();
                    String inStr;
                    String contents = "";
                    try
                    {
                        while ((inStr = dis.readUTF()) != null )
                        {
                            contents = contents + inStr;
                        }
                    }
                    catch(EOFException eofex)
                    {
                        /*Alert a = new Alert("end of file reached", eofex.getMessage(), null, AlertType.ERROR);
                        a.setTimeout(10000);*/
                        switchDisplayable(null, getForm());
                    }
                    catch(Exception e)
                    {
                        Alert a = new Alert("file read exception", e.getMessage(), null, AlertType.ERROR);
                        a.setTimeout(5000);
                        switchDisplayable(a, getForm());
                    }
                    DoSomething();
                }
                else
                {
                    DoSomethingElse();
                    fc.create();
                }
            }
            catch(Exception e)
            {
                Alert a = new Alert("Error creating file", e.getMessage(), null, AlertType.ERROR);
                a.setTimeout(10000);
                switchDisplayable(a, getForm());
            }
            finally
            {
                try{
                    fc.close();
                }
                catch(Exception exr)
                {
                    Alert a = new Alert("error closing read connection", exr.getMessage(), null, AlertType.ERROR);
                    a.setTimeout(10000);
                    switchDisplayable(a, getForm());
                }
            }
        }
    }
	public void WriteFile(String fileUrl,String myText)
    {
        String temp = System.getProperty("microedition.io.file.FileConnection.version");
        if ((!temp.equals(""))&&(temp!=null))
        {
            boolean DebugResume = true;
            DataOutputStream dos = null;
            try
            {
                FileConnection fc = (FileConnection)Connector.open(fileUrl, Connector.READ_WRITE);
                try{
                    DebugResume = false;
                    if (fc.exists())
					{
						try
						{
							fc.truncate(0);//exception is thrown here!! <----
						}
						catch(IOException ioe)
						{
							Alert a = new Alert("truncating-access denied", ioe.getMessage(), null, AlertType.ERROR);
							a.setTimeout(10000);
							switchDisplayable(a, getForm());
						}
						catch(ConnectionClosedException cce)
						{
							Alert a = new Alert("truncating-connection closed", cce.getMessage(), null, AlertType.ERROR);
							a.setTimeout(10000);
							switchDisplayable(a, getForm());
						}
						catch(SecurityException se)
						{
							Alert a = new Alert("truncating-security issue", se.getMessage(), null, AlertType.ERROR);
							a.setTimeout(10000);
							switchDisplayable(a, getForm());
						}
						catch(IllegalModeException ile)
						{
							Alert a = new Alert("truncating-illegal mode exception", ile.getMessage(), null, AlertType.ERROR);
							a.setTimeout(10000);
							switchDisplayable(a, getForm());
						}
						catch(IllegalArgumentException iae)
						{
							Alert a = new Alert("truncating-illegal argument", iae.getMessage(), null, AlertType.ERROR);
							a.setTimeout(10000);
							switchDisplayable(a, getForm());
						}
						catch(Exception e)
						{
							Alert a = new Alert("truncating existing file", e.getMessage(), null, AlertType.ERROR);
							a.setTimeout(10000);
							switchDisplayable(a, getForm());
						}
					}
					else
					{
						try
						{
							fc.create();
						}
						catch(Exception e)
		                {
		                    Alert a = new Alert("Creating file to write", e.getMessage(), null, AlertType.ERROR);
		                    a.setTimeout(10000);
		                    switchDisplayable(a, getForm());
		                }
					}
				}
				catch(Exception ex1)
				{
					Alert a = new Alert("Error opening fileConection", ex1.getMessage(), null, AlertType.ERROR);
					a.setTimeout(50000);
					switchDisplayable(a, getForm());
				}
				try{
                    dos = new DataOutputStream(fc.openDataOutputStream());
                    dos.writeUTF(myText);
                    if (dos != null)
                    {
                        dos.close();
                    }
                }
                catch(Exception ex2)
                {
                    Alert a = new Alert("Error writing to file", ex2.getMessage(), null, AlertType.ERROR);
                    a.setTimeout(10000);
                    switchDisplayable(a, getForm());
                }
				try{
                if (fc.isOpen()) fc.close();
                }
                catch(Exception ex3)
                {
                    Alert a = new Alert("Error Closing write connection", ex3.getMessage(), null, AlertType.ERROR);
                    a.setTimeout(50000);
                    switchDisplayable(a, getForm());
                }
			}
			catch(Exception e)
            {
                Alert a = new Alert("file exception4", e.getMessage(), null, AlertType.ERROR);
                a.setTimeout(50000);
                switchDisplayable(a, getForm());
            }			
        }
            
    }
	private void Work() 
	{  
        try
        {
            DirAddress = System.getProperty("fileconn.dir.recordings");//where to read/write file
			FileAddress = "myfile.txt";
            if(DirAddress!=null)
            {
                FileAddress = System.getProperty("fileconn.dir.recordings")+ FileAddress;
            }
        }
        catch(Exception e)
        {
			String directory = "X",
            FileAddress = "file:///" + getRoots() + Directory+"/"+ FileAddress;
            DirAddress = "file:///" + getRoots() + Directory;
        }
        ReadFile(FileAddress);
        DoSth();
        WriteFile(FileAddress,myText);
		DoSthElse();
    }
}

[jitu_goldie]

In Finally block close all the connection as well as close all the streams u opened too. After closing connection and streams set them to null.