Program: 31238
Project: 31238
Buggy source:
private void addNextElement(ImapRequestLineReader command,FetchRequest fetch) throws ProtocolException {
  char next=nextCharInLine(command);
  StringBuilder element=new StringBuilder();
  while (next != ' ' && next != '[' && next != ')') {
    element.append(next);
    command.consume();
    next=nextCharInLine(command);
  }
  String name=element.toString();
  if (next == ' ' || next == ')') {
    if ("String_Node_Str".equalsIgnoreCase(name)) {
      fetch.flags=true;
      fetch.internalDate=true;
      fetch.size=true;
    }
 else     if ("String_Node_Str".equalsIgnoreCase(name)) {
      fetch.flags=true;
      fetch.internalDate=true;
      fetch.size=true;
      fetch.envelope=true;
      fetch.body=true;
    }
 else     if ("String_Node_Str".equalsIgnoreCase(name)) {
      fetch.flags=true;
      fetch.internalDate=true;
      fetch.size=true;
      fetch.envelope=true;
    }
 else     if ("String_Node_Str".equalsIgnoreCase(name)) {
      fetch.flags=true;
    }
 else     if ("String_Node_Str".equalsIgnoreCase(name)) {
      fetch.size=true;
    }
 else     if ("String_Node_Str".equalsIgnoreCase(name)) {
      fetch.envelope=true;
    }
 else     if ("String_Node_Str".equalsIgnoreCase(name)) {
      fetch.internalDate=true;
    }
 else     if ("String_Node_Str".equalsIgnoreCase(name)) {
      fetch.body=true;
    }
 else     if ("String_Node_Str".equalsIgnoreCase(name)) {
      fetch.bodyStructure=true;
    }
 else     if ("String_Node_Str".equalsIgnoreCase(name)) {
      fetch.uid=true;
    }
 else     if ("String_Node_Str".equalsIgnoreCase(name)) {
      fetch.add(new BodyFetchElement("String_Node_Str","String_Node_Str"),false);
    }
 else     if ("String_Node_Str".equalsIgnoreCase(name)) {
      fetch.add(new BodyFetchElement("String_Node_Str","String_Node_Str"),true);
    }
 else     if ("String_Node_Str".equalsIgnoreCase(name)) {
      fetch.add(new BodyFetchElement("String_Node_Str","String_Node_Str"),false);
    }
 else {
      throw new ProtocolException("String_Node_Str" + name);
    }
  }
 else {
    consumeChar(command,'[');
    StringBuilder sectionIdentifier=new StringBuilder();
    next=nextCharInLine(command);
    while (next != ']') {
      sectionIdentifier.append(next);
      command.consume();
      next=nextCharInLine(command);
    }
    consumeChar(command,']');
    String parameter=sectionIdentifier.toString();
    StringBuilder partial=null;
    next=nextCharInLine(command);
    if ('<' == next) {
      partial=new StringBuilder();
      consumeChar(command,'<');
      next=nextCharInLine(command);
      while (next != '>') {
        partial.append(next);
        command.consume();
        next=nextCharInLine(command);
      }
      consumeChar(command,'>');
      next=nextCharInLine(command);
    }
    if ("String_Node_Str".equalsIgnoreCase(name)) {
      fetch.add(new BodyFetchElement("String_Node_Str" + parameter + ']',parameter,null == partial ? null : partial.toString()),false);
    }
 else     if ("String_Node_Str".equalsIgnoreCase(name)) {
      fetch.add(new BodyFetchElement("String_Node_Str" + parameter + ']',parameter,null == partial ? null : partial.toString()),true);
    }
 else {
      throw new ProtocolException("String_Node_Str" + name + "String_Node_Str");
    }
  }
}

Fixed version (ground truth):
private void addNextElement(ImapRequestLineReader command,FetchRequest fetch) throws ProtocolException {
  char next=nextCharInLine(command);
  StringBuilder element=new StringBuilder();
  while (next != ' ' && next != '[' && next != ')') {
    element.append(next);
    command.consume();
    next=nextCharInLine(command);
  }
  String name=element.toString();
  if (next == ' ' || next == ')') {
    if ("String_Node_Str".equalsIgnoreCase(name)) {
      fetch.flags=true;
      fetch.internalDate=true;
      fetch.size=true;
    }
 else     if ("String_Node_Str".equalsIgnoreCase(name)) {
      fetch.flags=true;
      fetch.internalDate=true;
      fetch.size=true;
      fetch.envelope=true;
      fetch.body=true;
    }
 else     if ("String_Node_Str".equalsIgnoreCase(name)) {
      fetch.flags=true;
      fetch.internalDate=true;
      fetch.size=true;
      fetch.envelope=true;
    }
 else     if ("String_Node_Str".equalsIgnoreCase(name)) {
      fetch.flags=true;
    }
 else     if ("String_Node_Str".equalsIgnoreCase(name)) {
      fetch.size=true;
    }
 else     if ("String_Node_Str".equalsIgnoreCase(name)) {
      fetch.envelope=true;
    }
 else     if ("String_Node_Str".equalsIgnoreCase(name)) {
      fetch.internalDate=true;
    }
 else     if ("String_Node_Str".equalsIgnoreCase(name)) {
      fetch.body=true;
    }
 else     if ("String_Node_Str".equalsIgnoreCase(name)) {
      fetch.bodyStructure=true;
    }
 else     if ("String_Node_Str".equalsIgnoreCase(name)) {
      fetch.uid=true;
    }
 else     if ("String_Node_Str".equalsIgnoreCase(name)) {
      fetch.add(new BodyFetchElement("String_Node_Str","String_Node_Str"),false);
    }
 else     if ("String_Node_Str".equalsIgnoreCase(name)) {
      fetch.add(new BodyFetchElement("String_Node_Str","String_Node_Str"),true);
    }
 else     if ("String_Node_Str".equalsIgnoreCase(name)) {
      fetch.add(new BodyFetchElement("String_Node_Str","String_Node_Str"),false);
    }
 else {
      throw new ProtocolException("String_Node_Str" + name);
    }
  }
 else {
    consumeChar(command,'[');
    StringBuilder sectionIdentifier=new StringBuilder();
    next=nextCharInLine(command);
    while (next != ']') {
      sectionIdentifier.append(next);
      command.consume();
      next=nextCharInLine(command);
    }
    consumeChar(command,']');
    String parameter=sectionIdentifier.toString();
    StringBuilder partial=null;
    next=command.nextChar();
    if ('<' == next) {
      partial=new StringBuilder();
      consumeChar(command,'<');
      next=nextCharInLine(command);
      while (next != '>') {
        partial.append(next);
        command.consume();
        next=nextCharInLine(command);
      }
      consumeChar(command,'>');
      next=nextCharInLine(command);
    }
    if ("String_Node_Str".equalsIgnoreCase(name)) {
      fetch.add(new BodyFetchElement("String_Node_Str" + parameter + ']',parameter,null == partial ? null : partial.toString()),false);
    }
 else     if ("String_Node_Str".equalsIgnoreCase(name)) {
      fetch.add(new BodyFetchElement("String_Node_Str" + parameter + ']',parameter,null == partial ? null : partial.toString()),true);
    }
 else {
      throw new ProtocolException("String_Node_Str" + name + "String_Node_Str");
    }
  }
}