Program: 51203
Project: 51203
Buggy source:
public void writeStartElement(String prefix,String localName,String namespaceURI) throws XMLStreamException {
  String effectiveName=getEffectiveName(namespaceURI,localName);
  processingStack.get(depth).isNotEmpty=true;
  processingStack.get(depth).currentName=effectiveName;
  try {
    boolean isNextArrayElement=processingStack.get(depth).currentName.equals(processingStack.get(depth).lastName);
    if (!isNextArrayElement) {
      if (isArrayElement(processingStack.get(depth).lastName)) {
        processingStack.get(depth).writer.write("String_Node_Str");
        processingStack.get(depth).lastIsArray=true;
        processingStack.get(depth).writer.write(processingStack.get(depth).lastElementWriter.getContent());
      }
 else {
        if (null != processingStack.get(depth).lastElementWriter) {
          if (processingStack.get(depth).lastIsArray) {
            processingStack.get(depth).writer.write("String_Node_Str");
            processingStack.get(depth).writer.write(processingStack.get(depth).lastElementWriter.getContent());
            processingStack.get(depth).writer.write("String_Node_Str");
          }
 else {
            processingStack.get(depth).writer.write(processingStack.get(depth).lastElementWriter.getContent());
          }
        }
        processingStack.get(depth).lastIsArray=false;
      }
      if (null != processingStack.get(depth).lastName) {
        if (processingStack.get(depth).lastIsArray) {
          processingStack.get(depth).writer.write("String_Node_Str");
          processingStack.get(depth).lastIsArray=false;
        }
        processingStack.get(depth).writer.write("String_Node_Str");
      }
      if (null == processingStack.get(depth).lastWasPrimitive) {
        processingStack.get(depth).writer.write("String_Node_Str");
      }
      processingStack.get(depth).writer.write("String_Node_Str" + effectiveName + "String_Node_Str");
    }
 else {
      processingStack.get(depth).writer.write(processingStack.get(depth).lastIsArray ? "String_Node_Str" : "String_Node_Str");
      processingStack.get(depth).lastIsArray=true;
      processingStack.get(depth).writer.write(processingStack.get(depth).lastElementWriter.getContent());
    }
    depth++;
    processingStack.add(depth,createProcessingState());
  }
 catch (  IOException ex) {
    Logger.getLogger(JsonXmlStreamWriter.class.getName()).log(Level.SEVERE,null,ex);
  }
}

Fixed version (ground truth):
public void writeStartElement(String prefix,String localName,String namespaceURI) throws XMLStreamException {
  String effectiveName=getEffectiveName(namespaceURI,localName);
  processingStack.get(depth).isNotEmpty=true;
  processingStack.get(depth).currentName=effectiveName;
  try {
    boolean isNextArrayElement=processingStack.get(depth).currentName.equals(processingStack.get(depth).lastName);
    if (!isNextArrayElement) {
      if (isArrayElement(processingStack.get(depth).lastName)) {
        processingStack.get(depth).writer.write(processingStack.get(depth).lastIsArray ? "String_Node_Str" : "String_Node_Str");
        processingStack.get(depth).lastIsArray=true;
        processingStack.get(depth).writer.write(processingStack.get(depth).lastElementWriter.getContent());
      }
 else {
        if (null != processingStack.get(depth).lastElementWriter) {
          if (processingStack.get(depth).lastIsArray) {
            processingStack.get(depth).writer.write("String_Node_Str");
            processingStack.get(depth).writer.write(processingStack.get(depth).lastElementWriter.getContent());
            processingStack.get(depth).writer.write("String_Node_Str");
          }
 else {
            processingStack.get(depth).writer.write(processingStack.get(depth).lastElementWriter.getContent());
          }
        }
        processingStack.get(depth).lastIsArray=false;
      }
      if (null != processingStack.get(depth).lastName) {
        if (processingStack.get(depth).lastIsArray) {
          processingStack.get(depth).writer.write("String_Node_Str");
          processingStack.get(depth).lastIsArray=false;
        }
        processingStack.get(depth).writer.write("String_Node_Str");
      }
      if (null == processingStack.get(depth).lastWasPrimitive) {
        processingStack.get(depth).writer.write("String_Node_Str");
      }
      processingStack.get(depth).writer.write("String_Node_Str" + effectiveName + "String_Node_Str");
    }
 else {
      processingStack.get(depth).writer.write(processingStack.get(depth).lastIsArray ? "String_Node_Str" : "String_Node_Str");
      processingStack.get(depth).lastIsArray=true;
      processingStack.get(depth).writer.write(processingStack.get(depth).lastElementWriter.getContent());
    }
    depth++;
    processingStack.add(depth,createProcessingState());
  }
 catch (  IOException ex) {
    Logger.getLogger(JsonXmlStreamWriter.class.getName()).log(Level.SEVERE,null,ex);
  }
}