Program: 57891
Project: 57891
Buggy source:
/** 
 * Constructor
 * @param database
 * @param p prefix
 * @throws SQLException
 * @throws ClassNotFoundException
 */
public SQLManager(final Database database,String p,boolean debug) throws SQLException, ClassNotFoundException {
  this.database=database;
  this.connection=database.openConnection();
  this.mySQL=database instanceof MySQL;
  this.globalTasks=new ConcurrentLinkedQueue<>();
  this.notifyTasks=new ConcurrentLinkedQueue<>();
  this.plotTasks=new ConcurrentHashMap<>();
  this.playerTasks=new ConcurrentHashMap<>();
  this.clusterTasks=new ConcurrentHashMap<>();
  TaskManager.runTaskAsync(new Runnable(){
    @Override public void run(){
      long last=System.currentTimeMillis();
      while (true) {
        if (SQLManager.this.closed) {
          break;
        }
        if (SQLManager.this.mySQL && System.currentTimeMillis() - last > 550000) {
          last=System.currentTimeMillis();
          try {
            close();
            SQLManager.this.closed=false;
            SQLManager.this.connection=database.forceConnection();
          }
 catch (          SQLException|ClassNotFoundException e) {
            e.printStackTrace();
          }
        }
        if (!sendBatch()) {
          try {
            if (!getNotifyTasks().isEmpty()) {
              for (              Runnable task : getNotifyTasks()) {
                TaskManager.runTask(task);
              }
              getNotifyTasks().clear();
            }
            Thread.sleep(50);
          }
 catch (          InterruptedException e) {
            e.printStackTrace();
          }
        }
      }
    }
  }
);
  this.prefix=p;
  this.SET_OWNER="String_Node_Str" + this.prefix + "String_Node_Str";
  this.GET_ALL_PLOTS="String_Node_Str" + this.prefix + "String_Node_Str";
  this.CREATE_PLOTS="String_Node_Str" + this.prefix + "String_Node_Str";
  this.CREATE_SETTINGS="String_Node_Str" + this.prefix + "String_Node_Str";
  this.CREATE_TIERS="String_Node_Str" + this.prefix + "String_Node_Str";
  this.CREATE_PLOT="String_Node_Str" + this.prefix + "String_Node_Str";
  this.CREATE_CLUSTER="String_Node_Str" + this.prefix + "String_Node_Str";
  createTables();
}

Fixed version (ground truth):
/** 
 * Constructor
 * @param database
 * @param p prefix
 * @throws SQLException
 * @throws ClassNotFoundException
 */
public SQLManager(final Database database,String p,boolean debug) throws SQLException, ClassNotFoundException {
  this.database=database;
  this.connection=database.openConnection();
  this.mySQL=database instanceof MySQL;
  this.globalTasks=new ConcurrentLinkedQueue<>();
  this.notifyTasks=new ConcurrentLinkedQueue<>();
  this.plotTasks=new ConcurrentHashMap<>();
  this.playerTasks=new ConcurrentHashMap<>();
  this.clusterTasks=new ConcurrentHashMap<>();
  this.prefix=p;
  this.SET_OWNER="String_Node_Str" + this.prefix + "String_Node_Str";
  this.GET_ALL_PLOTS="String_Node_Str" + this.prefix + "String_Node_Str";
  this.CREATE_PLOTS="String_Node_Str" + this.prefix + "String_Node_Str";
  this.CREATE_SETTINGS="String_Node_Str" + this.prefix + "String_Node_Str";
  this.CREATE_TIERS="String_Node_Str" + this.prefix + "String_Node_Str";
  this.CREATE_PLOT="String_Node_Str" + this.prefix + "String_Node_Str";
  this.CREATE_CLUSTER="String_Node_Str" + this.prefix + "String_Node_Str";
  TaskManager.runTaskAsync(new Runnable(){
    @Override public void run(){
      try {
        createTables();
      }
 catch (      SQLException e) {
        e.printStackTrace();
      }
      long last=System.currentTimeMillis();
      while (true) {
        if (SQLManager.this.closed) {
          break;
        }
        boolean hasTask=!globalTasks.isEmpty() || !playerTasks.isEmpty() || !plotTasks.isEmpty()|| !clusterTasks.isEmpty();
        if (hasTask) {
          try {
            if (SQLManager.this.mySQL && System.currentTimeMillis() - last > 550000 || !connection.isValid(10000)) {
              last=System.currentTimeMillis();
              reconnect();
            }
          }
 catch (          SQLException impossible) {
            impossible.printStackTrace();
          }
          if (!sendBatch()) {
            try {
              if (!getNotifyTasks().isEmpty()) {
                for (                Runnable task : getNotifyTasks()) {
                  TaskManager.runTask(task);
                }
                getNotifyTasks().clear();
              }
              Thread.sleep(50);
            }
 catch (            InterruptedException e) {
              e.printStackTrace();
            }
          }
        }
 else {
          try {
            Thread.sleep(5000);
          }
 catch (          InterruptedException e) {
            e.printStackTrace();
          }
        }
      }
    }
  }
);
}