Program: 33929
Project: 33929
Buggy source:
public List<String> list() throws IOException {
  List<String> result=new ArrayList<String>();
  File localeDir=new File(plugin.getDataFolder(),FOLDERPATH);
  if (localeDir.exists()) {
    FilenameFilter ymlFilter=new FilenameFilter(){
      @Override public boolean accept(      File dir,      String name){
        String lowercaseName=name.toLowerCase();
        if (lowercaseName.endsWith("String_Node_Str")) {
          return true;
        }
 else {
          return false;
        }
      }
    }
;
    for (    String fileName : localeDir.list(ymlFilter)) {
      result.add(fileName.replace("String_Node_Str","String_Node_Str"));
    }
    if (!result.isEmpty())     return result;
  }
  File jarfile=null;
  try {
    Method method=JavaPlugin.class.getDeclaredMethod("String_Node_Str");
    method.setAccessible(true);
    jarfile=(File)method.invoke(this.plugin);
  }
 catch (  Exception e) {
    throw new IOException(e);
  }
  JarFile jar=new JarFile(jarfile);
  Enumeration<JarEntry> entries=jar.entries();
  while (entries.hasMoreElements()) {
    JarEntry entry=entries.nextElement();
    String path=entry.getName();
    if (!path.startsWith(FOLDERPATH)) {
      continue;
    }
    if (entry.getName().endsWith("String_Node_Str")) {
      result.add((entry.getName().replace("String_Node_Str","String_Node_Str")).replace("String_Node_Str","String_Node_Str"));
    }
  }
  jar.close();
  return result;
}

Fixed version (ground truth):
public List<String> list() throws IOException {
  List<String> result=new ArrayList<String>();
  File localeDir=new File(plugin.getDataFolder(),FOLDERPATH);
  if (localeDir.exists()) {
    FilenameFilter ymlFilter=new FilenameFilter(){
      @Override public boolean accept(      File dir,      String name){
        String lowercaseName=name.toLowerCase();
        if (lowercaseName.endsWith("String_Node_Str") && name.length() == 9 && name.substring(2,3).equals("String_Node_Str")) {
          return true;
        }
 else {
          if (lowercaseName.endsWith("String_Node_Str") && !lowercaseName.equals("String_Node_Str")) {
            plugin.getLogger().severe("String_Node_Str" + name + "String_Node_Str");
          }
          return false;
        }
      }
    }
;
    for (    String fileName : localeDir.list(ymlFilter)) {
      result.add(fileName.replace("String_Node_Str","String_Node_Str"));
    }
    if (!result.isEmpty())     return result;
  }
  File jarfile=null;
  try {
    Method method=JavaPlugin.class.getDeclaredMethod("String_Node_Str");
    method.setAccessible(true);
    jarfile=(File)method.invoke(this.plugin);
  }
 catch (  Exception e) {
    throw new IOException(e);
  }
  JarFile jar=new JarFile(jarfile);
  Enumeration<JarEntry> entries=jar.entries();
  while (entries.hasMoreElements()) {
    JarEntry entry=entries.nextElement();
    String path=entry.getName();
    if (!path.startsWith(FOLDERPATH)) {
      continue;
    }
    if (entry.getName().endsWith("String_Node_Str")) {
      String name=entry.getName().replace("String_Node_Str","String_Node_Str").replace("String_Node_Str","String_Node_Str");
      if (name.length() == 5 && name.substring(2,3).equals("String_Node_Str")) {
        result.add(name);
      }
    }
  }
  jar.close();
  return result;
}