Program: 51202
Project: 51202
Buggy source:
public void writeEndElement() throws XMLStreamException {
  try {
    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 {
        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());
          processingStack.get(depth).writer.write("String_Node_Str");
        }
 else {
          processingStack.get(depth).writer.write(processingStack.get(depth).lastElementWriter.getContent());
        }
      }
    }
    if (processingStack.get(depth).writer.isEmpty) {
      processingStack.get(depth).writer.write("String_Node_Str");
    }
 else     if ((null == processingStack.get(depth).lastWasPrimitive) || !processingStack.get(depth).lastWasPrimitive) {
      processingStack.get(depth).writer.write("String_Node_Str");
    }
    processingStack.get(depth - 1).lastName=processingStack.get(depth - 1).currentName;
    processingStack.get(depth - 1).lastWasPrimitive=false;
    processingStack.get(depth - 1).lastElementWriter=processingStack.get(depth).writer;
    pollStack();
  }
 catch (  IOException ex) {
    Logger.getLogger(JsonXmlStreamWriter.class.getName()).log(Level.SEVERE,null,ex);
  }
}

Fixed version (ground truth):
public void writeEndElement() throws XMLStreamException {
  try {
    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 {
        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());
          processingStack.get(depth).writer.write("String_Node_Str");
        }
 else {
          processingStack.get(depth).writer.write(processingStack.get(depth).lastElementWriter.getContent());
        }
      }
    }
    if (processingStack.get(depth).writer.isEmpty) {
      processingStack.get(depth).writer.write("String_Node_Str");
    }
 else     if ((null == processingStack.get(depth).lastWasPrimitive) || !processingStack.get(depth).lastWasPrimitive) {
      processingStack.get(depth).writer.write("String_Node_Str");
    }
    processingStack.get(depth - 1).lastName=processingStack.get(depth - 1).currentName;
    processingStack.get(depth - 1).lastWasPrimitive=false;
    processingStack.get(depth - 1).lastElementWriter=processingStack.get(depth).writer;
    pollStack();
  }
 catch (  IOException ex) {
    Logger.getLogger(JsonXmlStreamWriter.class.getName()).log(Level.SEVERE,null,ex);
  }
}