Program: 19062
Project: 19062
Buggy source:
/** 
 * Loads the config.yml file. If it doesn't exist, it copies the file in the defaults/ folder in the jar to the right location
 */
@Override public void load(){
  dataFolder.getParentFile().mkdirs();
  File file=new File(dataFolder,"String_Node_Str");
  if (!file.exists()) {
    InputStream input=MCBouncer.class.getResourceAsStream("String_Node_Str");
    if (input != null) {
      FileOutputStream output=null;
      try {
        output=new FileOutputStream(file);
        byte[] buf=new byte[8192];
        int length=0;
        while ((length=input.read(buf)) > 0) {
          output.write(buf,0,length);
        }
      }
 catch (      IOException e) {
        e.printStackTrace();
      }
 finally {
        try {
          if (input != null) {
            input.close();
          }
        }
 catch (        IOException e) {
        }
        try {
          if (output != null) {
            output.close();
          }
        }
 catch (        IOException e) {
        }
      }
    }
  }
  YAMLFileNode node=new YAMLFileNode(file);
  node.load();
  this.conf=node;
  debugMode=conf.getBoolean("String_Node_Str",ConfigDefaults.DEBUG.getBoolVal());
  apiKey=conf.getString("String_Node_Str",ConfigDefaults.APIKEY.getStrVal());
  numBansDisallow=conf.getInteger("String_Node_Str",ConfigDefaults.BANSDISALLOW.getIntVal());
  showBanMessages=conf.getBoolean("String_Node_Str",ConfigDefaults.SHOWMESSAGES.getBoolVal());
  defaultReason=conf.getString("String_Node_Str",ConfigDefaults.DEFAULTBAN.getStrVal());
  defaultKickMessage=conf.getString("String_Node_Str",ConfigDefaults.DEFAULTKICK.getStrVal());
  website=conf.getString("String_Node_Str",ConfigDefaults.WEBSITE.getStrVal());
}

Fixed version (ground truth):
/** 
 * Loads the config.yml file. If it doesn't exist, it copies the file in the defaults/ folder in the jar to the right location
 */
@Override public void load(){
  dataFolder.getParentFile().mkdirs();
  File file=new File(dataFolder,"String_Node_Str");
  if (!file.exists()) {
    InputStream input=MCBouncer.class.getResourceAsStream("String_Node_Str");
    if (input != null) {
      FileOutputStream output=null;
      try {
        output=new FileOutputStream(file);
        byte[] buf=new byte[8192];
        int length=0;
        while ((length=input.read(buf)) > 0) {
          output.write(buf,0,length);
        }
      }
 catch (      IOException e) {
        e.printStackTrace();
      }
 finally {
        try {
          if (input != null) {
            input.close();
          }
        }
 catch (        IOException e) {
        }
        try {
          if (output != null) {
            output.close();
          }
        }
 catch (        IOException e) {
        }
      }
    }
  }
  YAMLFileNode node=new YAMLFileNode(file);
  node.load();
  this.conf=node;
  debugMode=conf.getBoolean("String_Node_Str",ConfigDefaults.DEBUG.getBoolVal());
  apiKey=conf.getString("String_Node_Str",ConfigDefaults.APIKEY.getStrVal());
  numBansDisallow=conf.getInteger("String_Node_Str",ConfigDefaults.BANSDISALLOW.getIntVal());
  showBanMessages=conf.getBoolean("String_Node_Str",ConfigDefaults.SHOWMESSAGES.getBoolVal());
  defaultReason=conf.getString("String_Node_Str",ConfigDefaults.DEFAULTBAN.getStrVal());
  defaultKickMessage=conf.getString("String_Node_Str",ConfigDefaults.DEFAULTKICK.getStrVal());
  website=conf.getString("String_Node_Str",ConfigDefaults.WEBSITE.getStrVal());
  disableIPFunctions=conf.getBoolean("String_Node_Str",ConfigDefaults.DISABLEIPFUNCTIONS.getBoolVal());
}