I have trouble running this paint program successfully!
The frame with a white panel area shows and then I get this error:
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at MyGoodPaint.annotateImage(MyGoodPaint.java:38)
at MyGoodPaint.paintComponent(MyGoodPaint.java:92)
at javax.swing.JComponent.paint(JComponent.java:1029)
at javax.swing.JComponent.paintChildren(JComponent.java:862)
at javax.swing.JComponent.paint(JComponent.java:1038)
at javax.swing.JComponent.paintChildren(JComponent.java:862)
at javax.swing.JComponent.paint(JComponent.java:1038)
at javax.swing.JLayeredPane.paint(JLayeredPane.java:567)
at javax.swing.JComponent.paintChildren(JComponent.java:862)
at javax.swing.JComponent.paintToOffscreen(JComponent.java:5131)
at javax.swing.RepaintManager$PaintManager.paintDoubleBuffered(RepaintManager.java:1479)
at javax.swing.RepaintManager$PaintManager.paint(RepaintManager.java:1410)
at javax.swing.RepaintManager.paint(RepaintManager.java:1224)
at javax.swing.JComponent.paint(JComponent.java:1015)
at java.awt.GraphicsCallback$PaintCallback.run(GraphicsCallback.java:21)
at sun.awt.SunGraphicsCallback.runOneComponent(SunGraphicsCallback.java:60)
at sun.awt.SunGraphicsCallback.runComponents(SunGraphicsCallback.java:97)
at java.awt.Container.paint(Container.java:1780)
at java.awt.Window.paint(Window.java:3375)
at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:796)
at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:713)
at javax.swing.RepaintManager.seqPaintDirtyRegions(RepaintManager.java:693)
at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(SystemEventQueueUtilities.java:125)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at MyGoodPaint.annotateImage(MyGoodPaint.java:38)
at MyGoodPaint.paintComponent(MyGoodPaint.java:92)
at javax.swing.JComponent.paint(JComponent.java:1029)
at javax.swing.JComponent.paintChildren(JComponent.java:862)
at javax.swing.JComponent.paint(JComponent.java:1038)
at javax.swing.JComponent.paintChildren(JComponent.java:862)
at javax.swing.JComponent.paint(JComponent.java:1038)
at javax.swing.JLayeredPane.paint(JLayeredPane.java:567)
at javax.swing.JComponent.paintChildren(JComponent.java:862)
at javax.swing.JComponent.paintToOffscreen(JComponent.java:5131)
at javax.swing.RepaintManager$PaintManager.paintDoubleBuffered(RepaintManager.java:1479)
at javax.swing.RepaintManager$PaintManager.paint(RepaintManager.java:1410)
at javax.swing.RepaintManager.paint(RepaintManager.java:1224)
at javax.swing.JComponent.paint(JComponent.java:1015)
at java.awt.GraphicsCallback$PaintCallback.run(GraphicsCallback.java:21)
at sun.awt.SunGraphicsCallback.runOneComponent(SunGraphicsCallback.java:60)
at sun.awt.SunGraphicsCallback.runComponents(SunGraphicsCallback.java:97)
at java.awt.Container.paint(Container.java:1780)
at java.awt.Window.paint(Window.java:3375)
at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:796)
at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:713)
at javax.swing.RepaintManager.seqPaintDirtyRegions(RepaintManager.java:693)
at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(SystemEventQueueUtilities.java:125)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)Here is the code:
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.awt.image.BufferedImage;
import java.io.File;
import javax.imageio.ImageIO;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class MyGoodPaint extends JPanel
int width = 400;
int height = 400;
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics2D g2;
int previousX;
int previousY;
int currentX;
int currentY;
public MyGoodPaint()
JFrame frame = new JFrame();
frame.add(this);
frame.setSize(width,height);
frame.setLocationRelativeTo(null);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
public void annotateImage()
g2.drawLine(previousX, previousY, currentX, currentY);
private class MyMouseMotionListener implements MouseListener, MouseMotionListener
public void mouseClicked(MouseEvent e)
public void mousePressed(MouseEvent e)
public void mouseReleased(MouseEvent event)
try
ImageIO.write(image, "png", new File("C:\\Users\\Deniz\\Desktop\\newberry.png"));
catch(Exception exception)
System.out.println("The exception caught is: " + exception);
public void mouseEntered(MouseEvent e)
public void mouseExited(MouseEvent e)
public void mouseDragged(MouseEvent e)
currentX = e.getX();
currentY = e.getY();
repaint();
public void mouseMoved(MouseEvent e)
protected void paintComponent(Graphics g)
super.paintComponent(g);
g.drawLine(previousX, previousY, currentX, currentY);
annotateImage();
previousX = currentX;
previousY = currentY;
public static void main(String[] args)
new MyGoodPaint();
}I am more interested in just getting it to work but please do also tell me of any bad practices I am doing and what the better way is at least briefly.
Any help in solving this problem would be greatly appreciated!
Thanks in advance!
Ok, I got it under control now.
Here is the latest code (I know I have things to fix but the stuff I needed help with have been dealt with):
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.awt.image.BufferedImage;
import java.io.File;
import javax.imageio.ImageIO;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class MyGoodPaint extends JPanel
int width = 400;
int height = 400;
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics2D g2 = image.createGraphics();
int previousX;
int previousY;
int currentX;
int currentY;
public MyGoodPaint()
JFrame frame = new JFrame();
frame.add(this);
frame.setSize(width,height);
frame.setLocationRelativeTo(null);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
MyMouseListener myMouseListener = new MyMouseListener();
this.addMouseListener(myMouseListener);
this.addMouseMotionListener(myMouseListener);
public void annotateImage()
g2.drawLine(previousX, previousY, currentX, currentY);
private class MyMouseListener implements MouseListener, MouseMotionListener
public void mouseClicked(MouseEvent e)
public void mousePressed(MouseEvent e)
public void mouseReleased(MouseEvent event)
try
ImageIO.write(image, "png", new File("C:\\Users\\Deniz\\Desktop\\newberry.png"));
catch(Exception exception)
System.out.println("The exception caught is: " + exception);
public void mouseEntered(MouseEvent e)
public void mouseExited(MouseEvent e)
public void mouseDragged(MouseEvent e)
currentX = e.getX();
currentY = e.getY();
repaint();
public void mouseMoved(MouseEvent e)
protected void paintComponent(Graphics g)
super.paintComponent(g);
g.drawLine(previousX, previousY, currentX, currentY);
annotateImage();
previousX = currentX;
previousY = currentY;
public static void main(String[] args)
new MyGoodPaint();
}Edit:
Darryl Burke: I forgot to say thank you :).
Edited by: s3a on May 29, 2011 1:10 PM
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thanks first.Hi Tihua
I hav faced the same problem.
The only way to solve this is you have to run this write statement before sending to spool inside the program. for that you hav to export the internal table values to another program which is called by using submit statement. write all the write statement as if it is in your current progrm.
After executing the whole loop you can import the no of pages to your current repot. and write leave progam at the end.
after that you can use that value in your report. -
Running a java program with eclipse
Hi,
I'm trying to run this java program(below) in eclipse..when i go to the 'run' icon inorder to choose the option 'run as' then 'java application' , i have 'none applicable' as the only option available. is it possibly because the program uses threads?
could someone using eclipse please try to execute this program and let me know if you succeed and how exactly you do it.
package reseaux;
import java.io.*;
import java.net.*;
import java.util.*;
public class LeServeur extends Thread{
Socket socket;
BufferedReader in;
PrintWriter out;
Vector FlowList=new Vector(10);
public LeServeur(Socket socket)throws IOException{
this.socket=socket;
in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
out= new PrintWriter(new OutputStreamWriter(socket.getOutputStream()));
public void run(){
String s;
synchronized(FlowList){
FlowList.addElement(this);
try{
while(!(s = in.readLine()).equalsIgnoreCase("/quit")){
for(int i=0;i<FlowList.size();i++){
synchronized(FlowList){
LeServeur monServeur=(LeServeur)FlowList.elementAt(i);
monServeur.out.println(s + "\r");
monServeur.out.flush();
catch(IOException e){
e.printStackTrace();
finally {
try {
in.close();
out.close();
socket.close();
} catch(IOException ioe) {
} finally {
synchronized(FlowList) {
FlowList.removeElement(this);
thanksthanks...
Infact, i wanted to run the main program called 'Serveur' but it uses 'LeServeur'( the code i sent before') and apparently it gives me an error msg that it doesnot recognise the 'LeServeur'...that's why i was thinking that i should probably first compile the 'LeServeur' so that it can be recognised in the 'Serveur' program.
here is the 'Serveur' code that uses an instantiation of the LeServeur...
package reseaux;
import java.net.*;
import java.io.*;
public class Serveur {
public int port;
public ServerSocket skt;
public Socket socket;
public static void main(String[] args) {
int port=8975;
ServerSocket skt=null;
Socket socket=null;
try{
if(args.length>0)
port=Integer.parseInt(args[0]);
catch(NumberFormatException n){
System.out.println("This port is used uniquely for listening");
System.exit(0);
try{
skt= new ServerSocket(port);
while (true){
socket =skt.accept();
LeServeur flow=new LeServeur();
flow.start();
catch(IOException e){
e.printStackTrace();
finally{
try{
skt.close();
catch(IOException e){
e.printStackTrace();
do you know have any idea why it doesnt recognise the 'LeServeur'?
ps:they're in the same package
thanks -
What are the mistake in this JSP program?
Hi,all. I am a newcomer to learn JSP, and I sincerely hope somebody help me. the following is a JSP program, and I want it extract data from my database and show them on webpage as XML. But there always have some mistakes I cann't found it. Could somebody help me find out them and tell me how to correct. Thanks veeeeeeeeeeeery much!
<%@ page contentType = "text/xml" %>
<%@ page language="java" %>
<%@ page import = "java.sql.* " %>
<%@ page import = "java.io.* " %>
<%@ page import = "javax.xml.parsers.DocumentBuilder" %>
<%@ page import = "javax.xml.parsers.DocumentBuilderFactory" %>
<%@ page import = "org.w3c.dom.Document" %>
<%@ page import = "org.w3c.dom.Element" %>
<%@ page import = "org.w3c.dom.Node" %>
<%@ page import = "org.w3c.dom.NodeList" %>
<%@ page extends = "Object"%>
<html>
<head><title>Searching Page</title></head>
<body>
<p><INPUT size=22 name=T1></p>
<p><INPUT type=submit value=OK name=B3></p>
<% Document retailerDoc = null;
Document dataDoc = null;
Document newDoc = null;
try {
DocumentBuilderFactory dbfactory = DocumentBuilderFactory.newInstance();
DocumentBuilder docbuilder = dbfactory.newDocumentBuilder();
retailerDoc = docbuilder.parse("RetailerXmlExtract.xml");
//Instantiate a new Document object
dataDoc = docbuilder.newDocument();
//Instantiate the new Document
newDoc = docbuilder.newDocument();
}catch(Exception e){}
//Retrieve the root element
Element retailerRoot = retailerDoc.getDocumentElement();
//Retrieve the (only) data element and cast it to Element
Node dataNode = retailerRoot.getElementsByTagName("data").item(0);
Element dataElement = (Element)dataNode;
String driverName = "sun.jdbc.odbc.JdbcOdbcDriver";
String connectURL = "jdbc:odbc:Retailer";
Connection db = null;
try{
Class.forName(driverName);
db = DriverManager.getConnection(connectURL);
catch(ClassNotFoundException e){}
catch(SQLException e){}
//Create the PreparedStatement
PreparedStatement statement = null;
//Create the Resultset object, which ultimately holds the data retrieved
ResultSet resultset = null;
//Create the ResultSetMetaData object, which will holds
//information about the ResultSet
ResultSetMetaData resultmetadata = null;
//Create a new element called "data"
Element dataRoot = dataDoc.createElement("data");
try{
statement = db.prepareStatement("SELECT * FROM Orders");
//Execute the query to populate the ResultSet
resultset = statement.executeQuery();
//Get the ResultSet information
resultmetadata = resultset.getMetaData();
//Determine the number of columns in the ResultSet
int numCols = resultmetadata.getColumnCount();
//Check for data by moving the cursor to the first record(if there is one)
while(resultset.next()){
//For each row of data, create a new element called "row"
Element rowEl = dataDoc.createElement("row");
for(int i = 1; i <= numCols; i++){
//For each colum index, determine the column name
String colName = resultmetadata.getColumnName(i);
//Get the column value
String colVal = resultset.getString(i);
//Determine if the last column accessed was null
if(resultset.wasNull()){
colVal = "and up";
//Create a new element with the same name as the column
Element dataEl = dataDoc.createElement(colName);
//Add the data to the new element
dataEl.appendChild(dataDoc.createTextNode(colVal));
//Add the new element to the row
rowEl.appendChild(dataEl);
//Add the row to the root element
dataRoot.appendChild(rowEl);
catch(SQLException e){}
finally{
try{
db.close();
}catch(SQLException e){}
//Add the root element to the document
dataDoc.appendChild(dataRoot);
//Retrieve the root element (also called "root")
Element newRootInfo = (Element)retailerRoot.getElementsByTagName("root").item(0);
//Retrieve the root and row information
String newRootName = newRootInfo.getAttribute("name");
String newRowName = newRootInfo.getAttribute("rowName");
//Retrive information on element to be built in the new document
NodeList newNodesRetailer = retailerRoot.getElementsByTagName("element");
//Create the final root element with the name from the file
Element newRootElement = newDoc.createElement(newRootName);
//Retrieve all rows in the old document
NodeList oldRows = dataRoot.getElementsByTagName("row");
for(int i=0;i<oldRows.getLength();i++){
//Retrieve each row in turn
Element thisRow = (Element)oldRows.item(i);
//Create the ner row
Element newRow = newDoc.createElement(newRowName);
for(int j=0;j<newNodesRetailer.getLength();j++){
//For each mode in the new mapping, retrieve teh information
//First the new information........
Element thisElement = (Element)newNodesRetailer.item(j);
String newElementName = thisElement.getAttribute("name");
//Then the old information
Element oldElement = (Element)thisElement.getElementsByTagName("content").item(0);
String oldField = oldElement.getFirstChild().getNodeValue();
//Get the original values based on the mapping information
Element oldValueElement = (Element)thisRow.getElementsByTagName(oldField).item(0);
String oldValue = oldValueElement.getFirstChild().getNodeValue();
//Create the new element
Element newElement = newDoc.createElement(newElementName);
newElement.appendChild(newDoc.createTextNode(oldValue));
//Retrieve list of new elements
NodeList newAttributes = thisElement.getElementsByTagName("attribute");
for(int k = 0;k<newAttributes.getLength();k++){
//For each new attribute, get the order information
Element thisAttribute = (Element)newAttributes.item(k);
String oldAttributeField = thisAttribute.getFirstChild().getNodeValue();
String newAttributeName = thisAttribute.getAttribute("name");
//Get the original vale
oldValueElement = (Element)thisRow.getElementsByTagName(oldAttributeField).item(0);
String oldAttributeValue = oldValueElement.getFirstChild().getNodeValue();
//Create the new attribute
newElement.setAttribute(newAttributeName, oldAttributeValue);
//Add the new element to the new row
newRow.appendChild(newElement);
//Add the new row to the root
newRootElement.appendChild(newRow);
//Add the new root to the document
newDoc.appendChild(newRootElement);
try{
out.println("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
out.ptintln("<!DOCTYPE orders SYSTEM \"RetailerXml.dtd\">");
out.println(newRootElement.toString());
} catch(IOException e) {}
%>
</body>
</html>it reminded that there were some mistakes when i run this JSP program,so it must have something wrong, but due to my weak programming skills, I can not found these mistakes out. That must give me very useful help if you tell me how to solve them. thank you vrey much!
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