FileConnection problems

Question

Hi,
I have an xml file which I would like to parse, for some reason I can not read the file. It would be great if I could get any help. I am using the Sony Ericsson wtk. I am using the SonyEricsson K750i emulator. I have stored the file (called map.xml) is stored in its root1 and c:/ and e:/ directory (I have tried accessing all of them). My code to access is as follows:
FileConnection conn;
          InputStream in = null;
          try {
               System.out.println("Does it get here?");
               conn = (FileConnection)Connector.open(xmlUri);
               if(!conn.exists()){
                    conn.create();
               in = conn.openInputStream();
               Reader reader = new InputStreamReader(in);this continues on to parse the file(which havent tested out yet)
this gives a null pointer exception
before I call this code I call the following methods
private void walkEntireDirectoryStructure(){
          System.out.println("Starting to walk Directory Structure");
          Enumeration e = FileSystemRegistry.listRoots();
          while (e.hasMoreElements()){
               String root = (String)e.nextElement();
            System.out.println("Root found: " + root);
            try {
                    FileConnection fc = (FileConnection)Connector.open(root);
                    if(fc.isDirectory()){
                         System.out.println("Is a directory");
                         walkDirectoryTree(fc);
                    }else{
                         System.out.println("NOT a directory");
               } catch (IOException e1) {
                    System.out.println("Failed to open fileConnection! " + e.toString());
               } catch(Throwable e1){
                    System.out.println("Yep, it's crap");
                    e1.printStackTrace();
          System.out.println("Finished Walking Directory Structure");
     private void walkDirectoryTree(FileConnection fc){
          try {
               Enumeration files = fc.list();
               while(files.hasMoreElements()){
                    String file = (String)files.nextElement();
                    System.out.println("Found: " + file);
                    FileConnection fileConn = (FileConnection)Connector.open(file);
                    if(fileConn.isDirectory()){
                         System.out.println("Found Directory: " + file + " |Starting to walk!");
                         walkDirectoryTree(fileConn);
                    }else{
                         System.out.println("Found File: " + file);
                    System.out.println("Found fil");
          } catch (IOException e) {
               System.out.println("Failed to get Enumeration of files: " + e.toString());
     }This should show all the files in the directories root1, c:/ and e:/
sample error code is:
*Running with storage root root1
Starting to walk Directory Structure
Root found: c:/
java.lang.ClassNotFoundException: com/sun/midp/io/j2me/c/Protocol
     at javax.microedition.io.Connector.openPrim(+255)
     at javax.microedition.io.Connector.open(+15)
     at javax.microedition.io.Connector.open(+6)
     at javax.microedition.io.Connector.open(+5)
     at valerie.xml.UnMarshal.walkEntireDirectoryStructure(+51)
     at valerie.xml.UnMarshal.parse(+4)
     at valerie.ui.screens.TestXmlScreen$ParseXML.run(+14)
java.lang.ClassNotFoundException: com/sun/midp/io/j2me/c/Protocol
     at javax.microedition.io.Connector.openPrim(+255)
     at javax.microedition.io.Connector.open(+40)
     at javax.microedition.io.Connector.open(+6)
     at javax.microedition.io.Connector.open(+5)
     at valerie.xml.UnMarshal.walkEntireDirectoryStructure(+51)
     at valerie.xml.UnMarshal.parse(+4)
     at valerie.ui.screens.TestXmlScreen$ParseXML.run(+14)
Failed to open fileConnection! javax.microedition.io.file.FileSystemRegistry$1@1a4cfaaa
Root found: e:/
java.lang.ClassNotFoundException: com/sun/midp/io/j2me/e/Protocol
     at javax.microedition.io.Connector.openPrim(+255)
     at javax.microedition.io.Connector.open(+15)
     at javax.microedition.io.Connector.open(+6)
     at javax.microedition.io.Connector.open(+5)
     at valerie.xml.UnMarshal.walkEntireDirectoryStructure(+51)
     at valerie.xml.UnMarshal.parse(+4)
     at valerie.ui.screens.TestXmlScreen$ParseXML.run(+14)
java.lang.ClassNotFoundException: com/sun/midp/io/j2me/e/Protocol
     at javax.microedition.io.Connector.openPrim(+255)
     at javax.microedition.io.Connector.open(+40)
     at javax.microedition.io.Connector.open(+6)
     at javax.microedition.io.Connector.open(+5)
     at valerie.xml.UnMarshal.walkEntireDirectoryStructure(+51)
     at valerie.xml.UnMarshal.parse(+4)
     at valerie.ui.screens.TestXmlScreen$ParseXML.run(+14)
Failed to open fileConnection! javax.microedition.io.file.FileSystemRegistry$1@1a4cfaaa
Root found: root1/
Yep, it's crap
java.lang.IllegalArgumentException: no ':' in URL
     at javax.microedition.io.Connector.openPrim(+37)
     at javax.microedition.io.Connector.open(+15)
     at javax.microedition.io.Connector.open(+6)
     at javax.microedition.io.Connector.open(+5)
     at valerie.xml.UnMarshal.walkEntireDirectoryStructure(+51)
     at valerie.xml.UnMarshal.parse(+4)
     at valerie.ui.screens.TestXmlScreen$ParseXML.run(+14)
Finished Walking Directory Structure
Uncaught exception java/lang/IllegalArgumentException: no ':' in URL.
Does it get here?
Execution completed.
0 bytecodes executed*

Answer 1

Well, just a quick try to answer your question:
1. You got ClassNotFoundException...
Are you sure you have included:
import javax.microedition.io.file.*;
import java.util.Enumeration; ? Maybe you have as you got no compilation error...
2. All file browsing should be performed in a separate thread. - inside run()
3. I've managed to develop a system traversing file system up and down the tree. 2 short code snippets:
        //browsing root list
        try
            Enumeration enumRoots = FileSystemRegistry.listRoots();
            String currentRoot = null;
            while (enumRoots.hasMoreElements())
               currentRoot = (String) enumRoots.nextElement();
               //do sth. with currentRoot
      catch(IllegalArgumentException e)
       catch (SecurityException e)
      catch(Exception e)
      //browsing folder list  (try + catch omitted).  m_fileConn is a member variable and was opened with:
       m_fileConn = (FileConnection) Connector.open("file:///"+m_sNewSubpath, Connector.READ); 
       m_fileConn.setFileConnection(m_sNewSubpath);  //usage of a subtath. Initially a root. then a folder inside the root.  (could be ".." when going up)
       if(m_fileConn.isDirectory())
          String element;
          Enumeration dirElements = m_fileConn.list();
          while (dirElements.hasMoreElements())
              element = (String)dirElements.nextElement();
              //use element           
       else
            //...