Sqlite On Cascade is not working JavaFX

I'm working on two tables. Table one is timeline and the second one is events. I want to delete all events when specific timeline is deleted but it's not working. Any suggestions?

Table Timeline:

  public static void createtable(){
      java.sql.Connection c = null;
        Statement stmt = null;
        try {
          Class.forName("org.sqlite.JDBC");
          c = DriverManager.getConnection("jdbc:sqlite:timeline_DB.db");
          System.out.println("Opened database successfully");

          stmt = c.createStatement();
          String sql = "CREATE TABLE if not exists timeline_table " +
                       "(title  VARCHAR(45) NOT NULL  PRIMARY KEY  , " + 
                       " timeline_startdate INT(50)     NOT NULL, " +
                       " timeline_startmonth INT(50)     NOT NULL, " +
                       " timeline_enddate INT(50)     NOT NULL, " + 
                       " timeline_endmonth INT(50)     NOT NULL, " + 
                       " timeline_no  INT(50)  NOT NULL  )"; 
        String index1=  "CREATE UNIQUE INDEX IF NOT EXISTS  index_1 ON timeline_table (title)";
       String index2 ="CREATE UNIQUE INDEX IF NOT EXISTS index_2 ON timeline_table (timeline_no)"; 
          stmt.executeUpdate(sql);
          stmt.executeUpdate(index1);
          stmt.executeUpdate(index2);
          stmt.close();
          c.close();
        } catch ( Exception e ) {
          System.err.println( e.getClass().getName() + ": " + e.getMessage() );
          System.exit(0);
        }
        System.out.println("Timeline Table created successfully");
      }

Table events:

 public static void createEventtable(){
      java.sql.Connection c = null;
        Statement stmt = null;
        try {
          Class.forName("org.sqlite.JDBC");
          c = DriverManager.getConnection("jdbc:sqlite:timeline_DB.db");
          System.out.println("Opened database successfully");

          stmt = c.createStatement();
          String sql = "CREATE TABLE if not exists event_table " +
                       "(event_title  VARCHAR(45) NOT NULL  PRIMARY KEY  , " + 
                       " timeline_title VARCHAR(45)    NOT NULL, " + 
                       " event_startyear INT(50)     NOT NULL, " + 
                       " event_endyear INT(50)     NOT NULL, " + 
                       " event_startmonth INT(50)     NOT NULL, " + 
                       " event_endmonth INT(50)      NULL, " + 
                       " bar_length INT(50)      NULL, " + 
                       " x_bar INT(50)      NULL, " + 
                       " y_bar INT(50)      NULL, " + 
                       "event_des VARCHAR(45) NOT NULL ,"+
                     "  FOREIGN KEY ('timeline_title')  REFERENCES `timeline_table` (`title`)   ON DELETE CASCADE  ON UPDATE CASCADE)"; 
        String index1=  "CREATE INDEX IF NOT EXISTS  index_1 ON timeline_table (event_title)";
          stmt.executeUpdate(sql);
          stmt.executeUpdate(index1);
          stmt.close();
          c.close();
        } catch ( Exception e ) {
          System.err.println( e.getClass().getName() + ": " + e.getMessage() );
          System.exit(0);
        }
        System.out.println("Event Table created successfully");
      }