ORA-00972: identifier is too long

I get the following exception, can some one help

java.sql.SQLException: ORA-00972: identifier is too long

at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:134)
at oracle.jdbc.ttc7.TTIoer.processError(TTIoer.java:289)
at oracle.jdbc.ttc7.Oall7.receive(Oall7.java:579)
at oracle.jdbc.ttc7.TTC7Protocol.doOall7(TTC7Protocol.java:1894)

Here is the code

try {
      System.out.println( "enter try block" );
    Class.forName(driver);
    conn = DriverManager.getConnection(url, username, password);
    System.out.println(conn );
      System.out.println( "get connection" );
      String sql = "INSERT INTO activate(title,first_name,last_name" +  "unit_type,unit_number,house_number,street_name,street_type" +"suburb,postcode,state,pre_ah_phone_number,ah_phone_number" +
"pre_phone_number,phone_number,date_of_birth,email,company,abn" +
"cust_type,mobile_phone_number,sim_number,activation,rate_plan" +
"voice, type ) VALUES(?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)";
 
      ps = conn.prepareStatement(sql);
      ps.setString(1,title);
      ps.setString(2,first_name);
      ps.setString(3,last_name);
      ps.setString(4,unit_type);
      ps.setString(5,unit_number);
      ps.setString(6,house_number);
      ps.setString(7,street_name);
      ps.setString(8,street_type);
      ps.setString(9,suburb);
      ps.setString(10,postcode);
      ps.setString(11,state);
      ps.setString(12,pre_ah_phone_number);
      ps.setString(13,ah_phone_number);
      ps.setString(14,pre_phone_number);
      ps.setString(15,phone_number);
      ps.setString(16,date_of_birth);
      ps.setString(17,email);
      ps.setString(18,company);
      ps.setString(19,abn);
      ps.setString(20,cust_type);
      ps.setString(21,mobile_phone_number);
      ps.setString(22,sim_number);
      ps.setString(23,activation);
      ps.setString(24,rate_plan);
      ps.setString(25,voice);
      ps.setString(26,type);
      
      ps.executeUpdate();
      System.out.println( "execute update" );
    }

I fixed it