Eception java.lang.error trying to create format XML string

I am trying to create XML documents without having to build everything manually whenever I want to do this.  I created a XMLFile class to create the document.  When I try to launch my app TestFoo, I get untrapped Exception java.lang.error.  I tried kxml2, using org.w3c.dom, java XML, banging my head against the wall as to why it will not work until I finally just rolled my own simple implementation.  I always get the error!  No details are provided.  There is no stack trace.  I use the emulator 9000 "BOLD" crossing os 4.6.0 eclipse 3.4.1

Console:

Starting TestFooStarted TestFoo(154)Exit TestFoo(154)ErrorNo detail messageTestFoo Document  0x171TestFoo XMLFile  0x381TestFoo TestFoo  0x297TestFoo TestFoo main 0x276

TestFoo.java

import net.rim.device.api.system.Application;

public class TestFoo extends Application {

  public static void main(String[] args) {      TestFoo foo = new TestFoo();      foo.enterEventDispatcher();   }

  public TestFoo() {        XMLFile xml = new XMLFile("rootNode");        xml.addProperty("myprop", "some value");      System.out.println(xml.toFormattedXMLString());       System.exit(0);   }}

XMLFile.java

public class XMLFile {   Document document;    public XMLFile(String rootElement) {      document = new Document(rootElement); }

  public void addProperty(String pName, String pText) {     Element elm = new Element("property");        elm.addAttribute("name", pName);      elm.setTextContent(pText);        document.appendChild(elm);    }    public String toFormattedXMLString() {     return document.toFormattedXML();    }}

Element.Java

import java.util.Enumeration;import java.util.Hashtable;import java.util.Vector;

public class Element {   private Vector children;  private String name;  private String textContent;   private Hashtable attributes;

  public Element(String name) {     this.children = new Vector();     this.attributes = new Hashtable();        this.name = name; } public void appendChild(Element child) {      this.children.addElement(child);  } public Vector getChildren() {     return children;  } public String getName() {     return name;  } public void setName(String name) {        this.name = name; } public String getTextContent() {      return textContent;   } public void setTextContent(String textContent) {      this.textContent = textContent;   } public Hashtable getAttributes() {        return attributes;    } public boolean hasChildren() {        return (this.children.size() > 0); } public int childrenCount() {      return this.children.size();  } public String getAttributeValue(String name) {        return this.attributes.get(name).toString();  } public void addAttribute(String key, String value) {      this.attributes.put(key, value);  } public void addAttribute(String key, int value) {     addAttribute(key,Integer.toString(value));    } public void addAttribute(String key, long value) {        addAttribute(key,Long.toString(value));   } public void addAttribute(String key, boolean value) {     addAttribute(key, String.valueOf(value)); } public boolean hasAttribute(String name) {        return this.attributes.containsKey(name); } public Element getChild(int position) {       return (Element) this.children.elementAt(position);   } public Enumeration getAttributeKeys() {       return this.attributes.keys();    }}

Document.Java

import java.util.Enumeration;

public class Document { private static final char _gt = '>';   private static final char _lt = '<';   private static final char _eq = '=';  private static final char _dqt = '"'; private static final char _cl = '/';  private static final char _sp = ' ';  private static final char _tab = '\t';    private static final byte[] _nl = System.getProperty("line.separator").getBytes();

  private Element rootNode; private StringBuffer sb;

  public Document(String rootName) {        this.rootNode = new Element(rootName);    } public void appendChild(Element child) {      this.rootNode.appendChild(child); } public String toFormattedXML() {      sb = new StringBuffer();      format(this.rootNode,0);      return sb.toString(); }

  private void format(Element node, int depth) {        writeOpenTag(node, depth);        for (int i=0;i0;i--) {            sb.append(_tab);      } }    private void writeOpenTag(Element node, int depth) {       indent(depth);        sb.append(_lt);       sb.append(node.getName());        for (Enumeration keys = node.getAttributeKeys();keys.hasMoreElements();) {            String key = keys.nextElement().toString();           sb.append(_sp).append(key);           sb.append(_eq).append(_dqt);          sb.append(node.getAttributeValue(key).toString());            sb.append(_dqt);      }    }    private void writeCloseTag(Element node, int depth) {       if (node.hasChildren()) {         sb.append(_lt).append(node.getName());        } else {          sb.append(_cl);       }     sb.append(_gt).append(_nl);    }}

This line:

private static final byte[] _nl = System.getProperty("line.separator").getBytes();

is originally a NullPointerException because line.separator is not well supported. The line terminator standard for XML is CR/LF, so you can use:

private static final byte[] _nl = { '\r', '\n' };

Tags: BlackBerry Developers

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import net.rim.device.api.ui.component.ButtonField;
import net.rim.device.api.ui.component.CheckboxField;
import net.rim.device.api.ui.component.Dialog;
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import net.rim.device.api.system.PersistentObject;
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