Program: 65734
Project: 65734
Buggy source:
/** 
 * INTERNAL:
 */
public void openStartElement(XPathFragment xPathFragment,NamespaceResolver namespaceResolver){
  try {
    Level position=null;
    if (levels.isEmpty()) {
      levels.push(new Level(true));
    }
 else {
      position=levels.peek();
      levels.push(new Level(true));
      if (position.isFirst()) {
        position.setFirst(false);
      }
 else {
        writer.write(',');
      }
    }
    this.addPositionalNodes(xPathFragment,namespaceResolver);
    if (!isLastEventText) {
      if (numberOfTabs > 0) {
        writer.write(Helper.cr());
      }
      for (int x=0; x < numberOfTabs; x++) {
        writer.write(TAB);
      }
    }
    if (position == null || !position.isCollection() || position.isEmptyCollection()) {
      isStartElementOpen=true;
      writer.write('"');
      if (xPathFragment.isAttribute() && attributePrefix != null) {
        writer.write(attributePrefix);
      }
      writer.write(xPathFragment.getLocalName());
      writer.write("String_Node_Str");
      if (position != null && position.isCollection()) {
        writer.write('[');
      }
      if (position != null && position.isEmptyCollection()) {
        position.setEmptyCollection(false);
      }
    }
    XPathFragment next=xPathFragment.getNextFragment();
    if (!(xPathFragment.isAttribute() || xPathFragment.nameIsText() || (next != null && next.nameIsText()))) {
      writer.write('{');
    }
    numberOfTabs++;
    isLastEventText=false;
  }
 catch (  IOException e) {
    throw XMLMarshalException.marshalException(e);
  }
}

Fixed version (ground truth):
/** 
 * INTERNAL:
 */
public void openStartElement(XPathFragment xPathFragment,NamespaceResolver namespaceResolver){
  try {
    Level position=null;
    if (levels.isEmpty()) {
      levels.push(new Level(true));
    }
 else {
      position=levels.peek();
      levels.push(new Level(true));
      if (position.isFirst()) {
        position.setFirst(false);
      }
 else {
        writer.write(',');
      }
    }
    this.addPositionalNodes(xPathFragment,namespaceResolver);
    if (!isLastEventText) {
      if (numberOfTabs > 0) {
        writer.write(Helper.cr());
      }
      for (int x=0; x < numberOfTabs; x++) {
        writer.write(TAB);
      }
    }
    if (position == null || !position.isCollection() || position.isEmptyCollection()) {
      isStartElementOpen=true;
      writer.write('"');
      if (xPathFragment.isAttribute() && attributePrefix != null) {
        writer.write(attributePrefix);
      }
      if (namespaceAware) {
        if (xPathFragment.getNamespaceURI() != null) {
          String prefix=null;
          if (namespaces != null) {
            prefix=namespaces.resolveNamespaceURI(xPathFragment.getNamespaceURI());
          }
 else           if (namespaceResolver != null) {
            prefix=namespaceResolver.resolveNamespaceURI(xPathFragment.getNamespaceURI());
          }
          if (prefix != null && !prefix.equals(XMLConstants.EMPTY_STRING)) {
            writer.write(prefix);
            writer.write(namespaceSeperator);
          }
        }
      }
      writer.write(xPathFragment.getLocalName());
      writer.write("String_Node_Str");
      if (position != null && position.isCollection()) {
        writer.write('[');
      }
      if (position != null && position.isEmptyCollection()) {
        position.setEmptyCollection(false);
      }
    }
    XPathFragment next=xPathFragment.getNextFragment();
    if (!(xPathFragment.isAttribute() || xPathFragment.nameIsText() || (next != null && next.nameIsText()))) {
      writer.write('{');
    }
    numberOfTabs++;
    isLastEventText=false;
  }
 catch (  IOException e) {
    throw XMLMarshalException.marshalException(e);
  }
}