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CoderKlip wrote: Is that the best way to make the program run until you either lose or I terminate it??
You probably want the user to terminate it by typing something normal like '0' or 'quit'.
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1. As you said you're new here, your code looks good comparable to other noobies, the indentations look perfectly professional.
2. You should use do-while loop in your code that after every round the code asks you to continue or not, terminating will be a little unsatisfying way to end a game.
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------------
public String getLogin(StudentTO sto)
{
String u=sto.getUsername();
String p=sto.getPassword();
System.out.println(sto.getUsername());
System.out.println(sto.getPassword());
String sql="select * from studentstable";
System.out.println(sql);
Object obj=JdbcTemplate.queryForObject(sql, new RowMapper() {
public Object mapRow(ResultSet rs) throws SQLException {
rs.beforeFirst();
while (rs.next()) {
String userdb=rs.getString("username");
String passdb=rs.getString("password");
String roledb=rs.getString("role");
String string="";
if(userdb.equals(u) && passdb.equals(p) && roledb.equalsIgnoreCase("admin")) {
System.out.println("ADMIN_ROLE");
string="ADMIN";
return string;
}else if(userdb.equals(u) && passdb.equals(p) && roledb.equalsIgnoreCase("user")) {
System.out.println("USER_ROLE");
string="USER";
return string;
}
------------------ after this code the return statement is not coming as object-------------------
Object obj=string;
}
return obj; <-------------------------------------------
}
});
StudentTO sto1=(StudentTO)obj;
System.out.println(sto1);
return sto1.toString();
}
i only want my method String getLogin() to give m result as ADMIIN or USER
modified 15-Jul-17 16:11pm.
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You are replacing obj each time round the loop, so if it finds a record that does not contain the correct values, then obj will refer to an empty string. When you find a matching set of values you should break out of the loop.
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can you tell m to write code in a correct way
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You just need to add a break statement in the two if clauses when you set the string value to "USER" or "ADMIN".
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thnks for the reply but i had solved my prblm with myself.
actually ur ans is not a correct solution buy the way thnxxx
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LOKENDRA YADAV wrote: actually ur ans is not a correct solution buy the way thnxxx
The way your code is formatted and broken up in your question it is far from easy to understand, so I had to make a guess.
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hi everybody,
i need help in video tracking.Fisrt of all i wanna make gui which shows video(any format) and slider to display with buttons aside which select file and extract the video.Example like this website page
Extract Frames from Video Files[^]
i wanna do like this display in java.Please help me
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Hello there. I am trying to implement Observer Pattern. I get notified, successfully, whenever a thread completes. I can start the same thread again when I get notified (through TaskListener I have implemented). But how do I start it again if there was some exception? Example
static MyWork objMyWork = null;
static Thread objThread = null;
public static void main(String[] args) throws
{
TaskListener listener = new TaskListener()
{
@Override
public void threadComplete()
{
try
{
objMyWork = new MyWork();
objMyWork.SetData1(int data);
objMyWork.SetData2(String data);
objMyWork.addListener(this);
objThread = new Thread(objMyWork);
objThread.start();
objThread.join();
}
catch(Exception ex)
{
}
}
}
objMyWork = new MyWork();
objMyWork.SetData1(int data);
objMyWork.SetData2(String data);
objMyWork.addListener(listener);
objThread = new Thread(objMyWork);
objThread.start();
objThread.join();
}
1- What changes do I make in MyWork so that control always comes back in the
catch section of TaskListener::threadComplete() whenever there was exception?
2- Once control is there, how do I start this thread again (I dont want to nest another try-catch block and then another in the nested one and then another .... and so on).
Thanks for anything you share 
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Hi expert,
I have the following method but no matter what I did to the line pstmt.executeUpdate or change it to if (pstmt.executeUpdate() != -1), it just gave me the error - No value specified for parameter 2..., earlier it was No value specified for parameter 1.... 
Hope someone can tell me where I had go wrong in my code. Tks.
public static int writeTutorId() throws Exception {
openConnection();
String qry = INSERT_QRY;
int tutor_id = 0;
PreparedStatement pstmt = connection.prepareStatement(qry, new String[] { "tutor_id" });
pstmt.setInt(1, tutor_id);
if (pstmt.executeUpdate() != -1) {
ResultSet rs = pstmt.getGeneratedKeys();
if (null != rs && rs.next()) {
tutor_id = rs.getInt(1);
}
pstmt.close();
connection.close();
}
return tutor_id;
}
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Your query - which you haven't shown - has at least two parameters.
You are only passing one parameter.
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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Hi Richard,
Here's the query :-
private final static String INSERT_QRY = "INSERT INTO project.tutor"
+ "(tutorName, tutorIC, tutorEmail, tutorAddress1, tutorAddress2, zipcode, tutorContactNo, tutorAge, tutorGender, tutorQualification, tutorQualificationDetail) values"
+ "(?,?,?,?,?,?,?,?,?,?,?);";
I did not put in the tutorId cos it is supposed to be generated out by the method I have written.
Initially, I did not include the pstmt.setInt(1, tutor_id) but when I googled, it said I must add it in. Futhermore, I have another insert method whereby all the infor like tutorName etc are inserted.
This method is to solely get the generatedKeys out...
What went wrong ?
modified 3-Jul-17 11:40am.
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Your query has 11 parameters.
You are passing 1 parameter.
Have a guess what the problem might be. 
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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Yes. It is easy to guess the problem.
I was thinking that (if) there is only a way I do not have to repeat the code with the ps.set blah blah blah for all the rest of the parameters and just on the Id alone. There is a lot of repeating code. Alas, I do not know how to overcome something like this.
The problem now is that I got a java.lang.NullPointerException on the line - Integer parameter - Age.
tutor m = new tutor();
int tutor_id = m.getTutor_id();
PreparedStatement pstmt = connection.prepareStatement(qry, new String[] { "tutor_id" });
pstmt.setInt(1, m.getTutor_id());
pstmt.setString(2, m.getName());
pstmt.setString(3, m.getNRIC());
pstmt.setString(4, m.getEmail());
pstmt.setString(5, m.getAddress2());
pstmt.setString(6, m.getZipcode());
pstmt.setString(7, m.getContactNo());
pstmt.setInt(8, m.getAge());
What causes the problem cos I have double checked I have indeed entered the value into the form....
I don't think I can find out anything like this via googling except asking in forum....
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karengsh wrote: don't think I can find out anything like this via googling except asking in forum.
You could try using your debugger and learning how to diagnose simple problems for yourself. Which field on that line is null and how did it become so after all the previous statements worked correctly?
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Cos now the error is com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException : Column 'tutorIC' cannot be null
After thinking of a long time, I think it should be because of the 2nd prepared Statement there is no controller so it becomes null.
I hope to know for my case, how to avoid the above since I have to repeat the similar prepared Statement in my generating keys Ids ?
public void insertTutor(tutor m) throws MyDataException {
openConnection();
try {
connection.setAutoCommit(false);
} catch (SQLException e1) {
e1.printStackTrace();
}
String qry = INSERT_QRY;
try (
PreparedStatement ps = connection.prepareStatement(qry)) {
;
ps.setString(1, m.getName());
ps.setString(2, m.getNRIC());
ps.setString(3, m.getEmail());
ps.setString(4, m.getAddress1());
ps.setString(5, m.getAddress2());
ps.setString(6, m.getZipcode());
ps.setString(7, m.getContactNo());
ps.setInt(8, m.getAge());
ps.setString(9, m.getGender());
blah blah blah
ps.executeUpdate();
connection.commit();
} catch (SQLException e) {
e.printStackTrace();
throw new MyDataException("DB Error");
} finally {
if (ps != null) {
closeConnection();
}
}
}
public static int writeTutorId() throws Exception {
openConnection();
String qry = INSERT_QRY;
tutor m = new tutor();
int tutor_id = m.getTutor_id();
PreparedStatement pstmt = connection.prepareStatement(qry, new String[] { "tutor_id" });
pstmt.setInt(1, m.getTutor_id());
pstmt.setString(2, m.getName());
pstmt.setString(3, m.getNRIC());
pstmt.setString(4, m.getEmail());
pstmt.setString(5, m.getAddress2());
pstmt.setString(6, m.getZipcode());
pstmt.setString(7, m.getContactNo());
pstmt.setInt(8, m.getAge());
pstmt.setString(9, m.getGender());
blah blah blah
if (pstmt.executeUpdate() != -1) {
ResultSet rs = pstmt.getGeneratedKeys();
if (null != rs && rs.next()) {
tutor_id = rs.getInt(1);
}
pstmt.close();
connection.close();
}
return tutor_id;
}
<pre lang="java">
My 2nd method in which it returns the generated key ids will be used in another insertion for my 3rd table and so I would still need this method to be in.
My controller :
<pre lang="java">
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
Statement stmt = null;
tutor m4 = new tutor();
manager mgr = new manager();
try {
String name = request.getParameter("name");
if (name != null){
m4.setName(name);
}
String NRIC = request.getParameter("nric");
if (NRIC != null){
m4.setNRIC(NRIC);
}
String email = request.getParameter("email");
if (email != null){
m4.setEmail(email);
String address1 = request.getParameter("address1");
if (address1 != null){
m4.setAddress1(address1);
}
String address2 = request.getParameter("address2");
if (address2 != null){
m4.setAddress2(address2);
}
String zipcode = request.getParameter("zipcode");
if (zipcode != null){
m4.setZipcode(zipcode);
}
String contactNo = request.getParameter("contactNo");
if (contactNo != null){
m4.setContactNo(contactNo);
}
int age = Integer.parseInt(request.getParameter("age"));
if (age != 0){
m4.setAge(age);
}
String gender = request.getParameter("Gender");
if (gender != null){
m4.setGender(gender);
}
so on and so for...
}
mgr.insertTutor(m4);
} }catch (Exception ex) {
ex.printStackTrace();
}
Subject s = new Subject();
try{
String[] sub = request.getParameterValues("subject");
List<String> subjName = Arrays.asList(sub);
mgr.insertSubject(subjName);
}catch (Exception ex) {
ex.printStackTrace();
}
try{
tutor_id = tutorDAOImpl.writeTutorId();
subj_id = subjectDAOImpl.Idlist();
tutor_SubjectDAOImpl.insertTutor_Subject(tutor_id, subj_id);
}
catch (Exception ex) {
ex.printStackTrace();
}
}
}
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I'm new to Java.
In writeTutorID you create a new tutor and then update the dataset with that variable (m). Does the class give default values? If not you are passing a null string.
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I have to do the same thing over and over again with firefox so I'd like to find a way through java.
How do I do that? I heard in the past about selenium. Is there a full explanation of how to use it? Please help
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Member 13290460 wrote: Please help
With what? We have no idea what you are trying to do. If you think Java and Selenium are the tools you need then go to their websites and study the documentation.
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Hello there. I am trying to send images (byte[] data) to web browser using java. I am doing this in a while(true) loop. My ClientThread sends one image only. After that, it starts producing this exception. Here is what I have tried so far
Overview
1- MainThread starts ServerThread
2- ServerThread start ClientThread
3- ClientThread has a loop. In this loop, I read next image and pass it to MovieWriter (which writes it to DataOutputStream of clientSocket) with a delay of 50ms
class ClientThread extends Thread
{
@Overrie
public void run()
{
OutputStream outStream = clientSocket.getOutputStream();
DataOutputStream dataOutStream = new DataOutputStream(outStream);
MovieWriter mv = new MovieWriter(dataOutStream);
mv.WriterHttpHeader();
while(true)
{
Thread.sleep(50);
ByteArrayOutputStream image = ReadImage.GetNext();
mv.WriteNextImage(image.toByteArray());
}
}
}
class MovieWriter
{
public MovieWriter(DataOutputStream)
{
}
public void WriterHttpHeader()
{
String header = "HTTP/1.1 200 OK \r\n Content-Type: multipart/x-mixed-replace; boundary=--boundary";
dataOutputStream.write(GetBytes(header));
}
public void WriteNextImage(byte[] data)
{
try
{
String response = "Content-Type: image/jpg \r\n" + "Content-Length: " + String.ValueOf(data.length);
dataOutputStream.write(GetBytes(response));
dataOutputStream.write(data);
} catch(Exception ex) {
ex.printStackTrace();
}
}
}
Again, when the while loop in ClientThread runs, MovieWriter sends one image only. After that, it raises the said exception. What am I doing wrong? Thanks for anything you share
NOTE: I cut this code short for better understanding. If you need more code, I can provide
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It seems to me that your logic is the wrong way round. A web browser is a client application that requests information form a web server. So your 'client' should be a server, which sends images based on requests from the browser, rather than trying to push them to a browser that is not expecting them.
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