Program: 3017
Project: 3017
Buggy source:
public OtherBlocks(PluginLoader pluginLoader,Server instance,PluginDescriptionFile desc,File folder,File plugin,ClassLoader cLoader){
  super(pluginLoader,instance,desc,folder,plugin,cLoader);
  folder.mkdirs();
  File yml=new File(getDataFolder(),"String_Node_Str");
  if (!yml.exists()) {
    try {
      yml.createNewFile();
      log.info("String_Node_Str" + getDataFolder() + "String_Node_Str");
      getConfiguration().setProperty("String_Node_Str",null);
      getConfiguration().save();
    }
 catch (    IOException ex) {
      log.warning(getDescription().getName() + "String_Node_Str");
    }
  }
  List<String> keys;
  try {
    keys=getConfiguration().getKeys(null);
  }
 catch (  NullPointerException ex) {
    log.warning(getDescription().getName() + "String_Node_Str");
    return;
  }
  if (!keys.contains("String_Node_Str")) {
    log.warning(getDescription().getName() + "String_Node_Str");
    return;
  }
  keys.clear();
  keys=getConfiguration().getKeys("String_Node_Str");
  if (null == keys) {
    log.info(getDescription().getName() + "String_Node_Str");
    return;
  }
  for (  String s : keys) {
    List<Object> original_children=getConfiguration().getList("String_Node_Str" + s);
    if (original_children == null) {
      log.warning("String_Node_Str" + s + "String_Node_Str");
      continue;
    }
    for (    Object o : original_children) {
      if (o instanceof HashMap<?,?>) {
        OtherBlocksContainer bt=new OtherBlocksContainer();
        try {
          @SuppressWarnings("String_Node_Str") HashMap<String,Object> m=(HashMap<String,Object>)o;
          bt.original=Material.valueOf(s);
          String toolString=String.class.cast(m.get("String_Node_Str"));
          if (toolString.equalsIgnoreCase("String_Node_Str")) {
            toolString="String_Node_Str";
          }
          bt.tool=(toolString.equalsIgnoreCase("String_Node_Str") ? null : Material.valueOf(toolString));
          bt.dropped=Material.valueOf(String.class.cast(m.get("String_Node_Str")));
          Integer dropQuantity=Integer.class.cast(m.get("String_Node_Str"));
          bt.quantity=(dropQuantity == null || dropQuantity <= 0) ? 1 : dropQuantity;
          Integer toolDamage=Integer.class.cast(m.get("String_Node_Str"));
          bt.damage=(toolDamage == null || toolDamage < 0) ? 1 : toolDamage;
          Integer dropChance=Integer.class.cast(m.get("String_Node_Str"));
          bt.chance=(dropChance == null || dropChance < 0 || dropChance > 100) ? 100 : dropChance;
          DyeColor dropColor=DyeColor.valueOf(String.class.cast(m.get("String_Node_Str")));
          bt.color=((dropColor == null) ? null : dropColor.getData());
        }
 catch (        IllegalArgumentException ex) {
          log.warning("String_Node_Str" + s);
          continue;
        }
        transformList.add(bt);
        log.info(getDescription().getName() + "String_Node_Str" + (bt.tool == null ? "String_Node_Str" : bt.tool.toString())+ "String_Node_Str"+ bt.original.toString()+ "String_Node_Str"+ bt.quantity.toString()+ "String_Node_Str"+ bt.dropped.toString()+ "String_Node_Str"+ bt.chance.toString()+ "String_Node_Str");
      }
    }
  }
}

Fixed version (ground truth):
public OtherBlocks(PluginLoader pluginLoader,Server instance,PluginDescriptionFile desc,File folder,File plugin,ClassLoader cLoader){
  super(pluginLoader,instance,desc,folder,plugin,cLoader);
  folder.mkdirs();
  File yml=new File(getDataFolder(),"String_Node_Str");
  if (!yml.exists()) {
    try {
      yml.createNewFile();
      log.info("String_Node_Str" + getDataFolder() + "String_Node_Str");
      getConfiguration().setProperty("String_Node_Str",null);
      getConfiguration().save();
    }
 catch (    IOException ex) {
      log.warning(getDescription().getName() + "String_Node_Str");
    }
  }
  List<String> keys;
  try {
    keys=getConfiguration().getKeys(null);
  }
 catch (  NullPointerException ex) {
    log.warning(getDescription().getName() + "String_Node_Str");
    return;
  }
  if (!keys.contains("String_Node_Str")) {
    log.warning(getDescription().getName() + "String_Node_Str");
    return;
  }
  keys.clear();
  keys=getConfiguration().getKeys("String_Node_Str");
  if (null == keys) {
    log.info(getDescription().getName() + "String_Node_Str");
    return;
  }
  for (  String s : keys) {
    List<Object> original_children=getConfiguration().getList("String_Node_Str" + s);
    if (original_children == null) {
      log.warning("String_Node_Str" + s + "String_Node_Str");
      continue;
    }
    for (    Object o : original_children) {
      if (o instanceof HashMap<?,?>) {
        OtherBlocksContainer bt=new OtherBlocksContainer();
        try {
          @SuppressWarnings("String_Node_Str") HashMap<String,Object> m=(HashMap<String,Object>)o;
          bt.original=Material.valueOf(s);
          String toolString=String.class.cast(m.get("String_Node_Str"));
          if (toolString.equalsIgnoreCase("String_Node_Str")) {
            toolString="String_Node_Str";
          }
          bt.tool=(toolString.equalsIgnoreCase("String_Node_Str") ? null : Material.valueOf(toolString));
          bt.dropped=Material.valueOf(String.class.cast(m.get("String_Node_Str")));
          Integer dropQuantity=Integer.class.cast(m.get("String_Node_Str"));
          bt.quantity=(dropQuantity == null || dropQuantity <= 0) ? 1 : dropQuantity;
          Integer toolDamage=Integer.class.cast(m.get("String_Node_Str"));
          bt.damage=(toolDamage == null || toolDamage < 0) ? 1 : toolDamage;
          Integer dropChance=Integer.class.cast(m.get("String_Node_Str"));
          bt.chance=(dropChance == null || dropChance < 0 || dropChance > 100) ? 100 : dropChance;
          String dropColor=String.class.cast(m.get("String_Node_Str"));
          bt.color=((dropColor == null) ? 0 : DyeColor.valueOf(dropColor).getData());
        }
 catch (        IllegalArgumentException ex) {
          log.warning("String_Node_Str" + s);
          continue;
        }
catch (        NullPointerException ex) {
          log.warning("String_Node_Str" + s);
          continue;
        }
        transformList.add(bt);
        log.info(getDescription().getName() + "String_Node_Str" + (bt.tool == null ? "String_Node_Str" : bt.tool.toString())+ "String_Node_Str"+ bt.original.toString()+ "String_Node_Str"+ bt.quantity.toString()+ "String_Node_Str"+ bt.dropped.toString()+ "String_Node_Str"+ bt.chance.toString()+ "String_Node_Str");
      }
    }
  }
}