Help Needed - Java Threads

Hi there,
It's related to Threads in Java, I have the following code and it doesnt compile using NetBeans. While it compiles and runs fine in command prompt i.e. using javac testthreads.java.
class test implements Runnable{
public void run(){
System.out.println("this is from test class");
class testthreads{
public static void main(String args[]){
test t=new test();
Thread tt=new Thread(t);
tt.start();
I get the following error when trying to compile.
init:
deps-jar:
Compiling 1 source file to C:\myjavacode\ExtendThreadClassTest0\build\classes
C:\myjavacode\ExtendThreadClassTest0\src\MainClass.java:13: cannot find symbol
symbol : constructor Thread(test)
location: class java.lang.Thread
Thread tt=new Thread(t);
1 error
BUILD FAILED (total time: 0 seconds)
If I use extends Thread instead of implements Runnable the above source code compiles fine in NetBeans as well.
Any idea what's wrong..... Pls suggest!!
Thanks!

but this seems to be the issue with netbeans ide.... any idea if I need to change any setting etc. in IDE?

Similar Messages

Need help with java thread program

Hi
I have an applet which does some painting etc, i need to write a thread which runs in background, and if there is no user activity for 30 min will refresh the screen.
I have one good thing that all user options go from one program so i know when user does some thing.
How do i write this thread program?
1. I need this program to start counter as soon as some activity is done by user
2. When user does some thing stop this thread
3. when user completes his action restart the thread with 30 min timer.
4. when there is no activity for 30 min refresh the screen
Any help will be really good
Ashish

Not sure what the problem is. Your pseudo code looks good to me.
The only suggestion I would make is that your use a Timer so you don't have to worry about creating your own Thread. You schedule a Timer to fire in 30 minutes. Everytime you have activiity you cancel the timer and reschedule it.

Help needed on threads!!!

Hello All,
Following is the scenario that I'm trying to do.
Thread_A: puts the data/messages into Queue A (I'm using linked list as the data structure)
Thread_B - pulls the data/messages out from Queue A .
So far I have implemented the following
Class A implements Runnable
{   LinkedList queue A = new LinkedList ();
Thread_ A = new THread (this)
Thread_A.start();
run{
Putting the messages into QueueA;
classB.copyQueue(queueA); //this method is defined in classB
Class B implements Runnable
{   LinkedList queueB   = new LinkedList ();
Thread_ B = new THread (this)
Thread_B.start();
copyQueue(linkedList A){
queueB = A;
run{
pull the messages from QueueB;
I hope I have explanined it clearly. . Is my design approach ok so far.? somehow I don't get that feelng. THought I will consult the experts. I'm new to java. Please excuse me if this is a silly question. Please help.
Thanks.

Well, there's no reason for each class to have it's own reference to the queue, for a start. Simpler to give B a reference to the instance of class A.
You need to guard the access to the queue with synchronized and use the wait/notify methods to make threadB wait if the queue is empty.
Easiest to stick a pair of syncrhonized methods into class A like:
public synchronized void addToQueue(Object item) {
     if(queueA.isEmpty())
         notifyAll();   // if queue was empty wake the consumer thread
     queueA.add(item);
public synchronized Object takeFromQueue() throws InteruptedException {
    while queueA.isEmpty()
       wait();
    return queueA.removeFirst();
     }Thread B calls takeFormQueue to get each item, which will cause it to wait until there's somthing to take.

Help needed about thread priority

Hello, could someone help me with the priorities in java? I got 10 levels in total(1-10), but I do need at least 20 levels for my multiple threads program.
Thank you for your kind help in advance.

First, let me apologize if I am incorrect, but it seems that the native Thread implementation restricts you to 10 priorities regardless.
However, you can do just about anything you envision, but it will require some implementation on your part.
You could implement a subclass of thread that contains your priority (which could be from 1-20). You could then maintain a ThreadManager that would store all running threads, and would accept requests to start and stop threads. The ThreadManager could make decisions about which threads to run, which to interrupt, which to sleep, etc., based on your priority value.
This sounds like alot to swallow, but I'm sure it's doable if you understand threads.

First Spring Application .Help needed.java.lang.ClassNotFoundException

Hi
i am new to this site and java Springs, I couldn't find seprate spring forum so i am posting my question here.
i hope its not a problem.
I am very new to Springs and struggeling through my first Spring MVC application. can any one help me here.
Here is what i have done uptill now.
WEB.XML
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
    <servlet>
        <servlet-name>HelloSpring</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
        </servlet>
    <servlet-mapping>
        <servlet-name>HelloSpring</servlet-name>
        <url-pattern>*.htm</url-pattern>
    </servlet-mapping>
    <session-config>
        <session-timeout>
            30
        </session-timeout>
    </session-config>
    <welcome-file-list>
     <welcome-file>
            index.jsp
        </welcome-file>
    </welcome-file-list>
</web-app>
HelloSpring-servlet.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN/EN" "http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
    <bean id="urlMapping" class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
        <property name="mappings">
            <props>
                <prop key="/hello.htm">HelloSpringController</prop>
            </props>
        </property>
    </bean>
    <bean id = "HelloSpringController" class="HelloSpringController" />
</beans>
index.jsp
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>Hello Spring</title>
    </head>
    <body>
    <form action="hello.htm" method="POST">
        What is your name?
        <input type="text" name="yourName" value="" />
    </form>
    </body>
</html>
welcome.jsp
<%@page contentType="text/html"%>
<%@page pageEncoding="UTF-8"%>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
   "http://www.w3.org/TR/html4/loose.dtd">
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>Hello Spring</title>
    </head>
    <body>
    Hello <c:out value="${name}" />
    </body>
</html>
HelloSpringController.java (in default package)
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.Controller;
public class HelloSpringController implements Controller {
    public HelloSpringController() {
    public ModelAndView handleRequest(HttpServletRequest httpServletRequest,
                                      HttpServletResponse httpServletResponse)
                                        throws Exception {
        String name = httpServletRequest.getParameter("yourName");
        return new ModelAndView("welcome.jsp", "name", name);
}After Entering name in the text box of index.jsp, i am getting the following error.
exception
javax.servlet.ServletException: Servlet.init() for servlet HelloSpring threw exception
     org.jboss.web.tomcat.security.CustomPrincipalValve.invoke(CustomPrincipalValve.java:39)
     org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:159)
     org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:59)
     org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
     org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
     org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856)
     org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)
     org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
     org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)
     java.lang.Thread.run(Unknown Source)
root cause
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'urlMapping' defined in ServletContext resource [/WEB-INF/HelloSpring-servlet.xml]: Initialization of bean failed; nested exception is org.springframework.beans.factory.CannotLoadBeanClassException: Cannot find class [HelloSpringController] for bean with name 'HelloSpringController' defined in ServletContext resource [/WEB-INF/HelloSpring-servlet.xml]; nested exception is java.lang.ClassNotFoundException: HelloSpringController
     org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:451)
     org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:251)
     org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:156)
     org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:248)
     org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:160)
     org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:287)
     org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:352)
     org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:330)
     org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:266)
     org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:236)
     org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:126)
     javax.servlet.GenericServlet.init(GenericServlet.java:211)
     org.jboss.web.tomcat.security.CustomPrincipalValve.invoke(CustomPrincipalValve.java:39)
     org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:159)
     org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:59)
     org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
     org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
     org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856)
     org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)
     org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
     org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)
     java.lang.Thread.run(Unknown Source)
root cause
java.lang.ClassNotFoundException: HelloSpringController
     org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1332)
     org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1181)
     org.springframework.util.ClassUtils.forName(ClassUtils.java:201)
     org.springframework.beans.factory.support.AbstractBeanDefinition.resolveBeanClass(AbstractBeanDefinition.java:327)
     org.springframework.beans.factory.support.AbstractBeanFactory.resolveBeanClass(AbstractBeanFactory.java:1066)
     org.springframework.beans.factory.support.AbstractBeanFactory.isBeanClassMatch(AbstractBeanFactory.java:1094)
     org.springframework.beans.factory.support.AbstractBeanFactory.isSingleton(AbstractBeanFactory.java:354)
     org.springframework.context.support.AbstractApplicationContext.isSingleton(AbstractApplicationContext.java:745)
     org.springframework.web.servlet.handler.AbstractUrlHandlerMapping.registerHandler(AbstractUrlHandlerMapping.java:255)
     org.springframework.web.servlet.handler.SimpleUrlHandlerMapping.registerHandlers(SimpleUrlHandlerMapping.java:125)
     org.springframework.web.servlet.handler.SimpleUrlHandlerMapping.initApplicationContext(SimpleUrlHandlerMapping.java:103)
     org.springframework.context.support.ApplicationObjectSupport.setApplicationContext(ApplicationObjectSupport.java:73)
     org.springframework.context.support.ApplicationContextAwareProcessor.postProcessBeforeInitialization(ApplicationContextAwareProcessor.java:72)
     org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:304)
     org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1168)
     org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:428)
     org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:251)
     org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:156)
     org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:248)
     org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:160)
     org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:287)
     org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:352)
     org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:330)
     org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:266)
     org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:236)
     org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:126)
     javax.servlet.GenericServlet.init(GenericServlet.java:211)
     org.jboss.web.tomcat.security.CustomPrincipalValve.invoke(CustomPrincipalValve.java:39)
     org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:159)
     org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:59)
     org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
     org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
     org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856)
     org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)
     org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
     org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)
     java.lang.Thread.run(Unknown Source)Can anybody tell me what is am doing wrong .. it will be a greate help...
thanks in advance

vikash_sharma wrote:
Thanks for another quick reply
here is the folder structure of war.
HelloSpring.war
-----------Bin (empty)Wrong. No need for this. Remove it.
------------src/HelloSpringController.javaWrong. Source code doesn't go in WAR.
------------WEB-INF/classes(empty)there's your problem. the HelloSpringController.class has to be in there.
/libWhere are the Spring JARs?
/META-INF
/tldDon't need /tld.
------------welcome.jsp
------------index.jspWhere's your web.xml? Where is the Spring configuration?
You're still blank. Not even close to correct. You don't seem to know Java well enough to tackle this. You will NOT be able to accomplish this by asking questions here. Go back and learn more basics.
%

Urgent help needed(java frames)

Hi,
I need urgent help for correcting a piece of code.
I have written a piece of code for building a gui with some buttons, drawing some geometric shapes.The code consists of two files called Graph and Frame.
The problem I suppose in the last part of the Graph file, which Rectangle and Circle are called together, the only shape that the program draws is rectangle.Here is the code:
//Graph
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import java.io.*;
import java.util.*;
public class Graph extends JPanel {
LinkedList color;
LinkedList figures;
public Graph() {
setBackground(Color.white);
figures = new LinkedList();
color = new LinkedList();
int z;
class Point {
int x;
int y;
public Point(int x, int y) {
this.x = x;
this.y = y;
public Point(Point p) {
x = p.x;
y = p.y;
public String toString() {
return "(" + x + ", " + y + ")";
public void move(Point dist) {
x += dist.x;
y += dist.y;
abstract class GeomFigur {
public abstract void move(Point p);
class Line extends GeomFigur {
Point p1, p2;
public Line(Point p1, Point p2) {
this.p1 = new Point(p1);
this.p2 = new Point(p2);
public String toString() { return "Line from " + p1 + " to " + p2; }
public void move(Point dist) {
p1.move(dist);
p2.move(dist);
class Rectangle extends Line {
public Rectangle(Point p1, Point p2) {
super(p1, p2);
public String toString() { return "Rectangle from " + p1 + " to " + p2; }
class Circle extends GeomFigur{
Point centre;
int radius;
public Circle(Point centre, int radius) {
this.centre = new Point(centre);
this.radius = radius;
public String toString() {
return "Circle, centre " + centre + ", radius " + radius;
public void move(Point dist) { centre.move(dist); }
public void addRectangle(int x, int y, Color col) {
Rectangle r =new Rectangle(new Point(x,y),new Point(x+20,y+20));
figures.addLast(r);
color.addLast(col);
repaint();
public void addCircle(int x, int y, Color col) {
Circle c =new Circle(new Point(x,y), 1 );
figures.addLast(c);
color.addLast(col);
repaint();
public void paintComponent(Graphics g) {
super.paintComponent(g);
for (int i=0;i < figures.size();i++) {
Rectangle rect = (Rectangle)figures.get(i);
//Circle circ = (Circle)figures.get(i);
g.setColor(Color.black);
g.drawRect(rect.p1.x,rect.p1.y,20,20);
g.setColor((Color)color.get(i));
g.fillRect(rect.p1.x,rect.p1.y,20,20);
//g.setColor(Color.black);
// g.drawOval(circ.centre.x,circ.centre.y,20,20);
// g.setColor((Color)color.get(i));
// g.fillOval(circ.centre.x, circ.centre.y, 20, 20);
//Frame
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
public class Frame extends JFrame implements ActionListener {
JButton button1, button2, button3, button4, button5 ;
Graph gr;
JComboBox cbx;
JComboBox cby;
JComboBox col;
JMenu filemenu;
JMenuItem quit;
JMenuBar menubar;
int x=10;
int y=10;
Color color=Color.red;
public Frame() {
menubar = new JMenuBar();
filemenu = new JMenu("File");
filemenu.setMnemonic('F');
quit = new JMenuItem("Quit");
quit.addActionListener(this);
quit.setMnemonic('Q');
quit.setAccelerator(KeyStroke.getKeyStroke('Q',Event.CTRL_MASK,false));
filemenu.add(quit);
menubar.add(filemenu);
setJMenuBar(menubar);
button1 = new JButton("Rectangle");
button1.addActionListener(this);
button2 = new JButton("Circle");
button2.addActionListener(this);
button4 = new JButton("Ellipse");
button4.addActionListener(this);
button5 = new JButton("Triangle");
button5.addActionListener(this);
button3 = new JButton("Reset");
button3.addActionListener(this);
String[] elements_x= {"10","20","30","40","50","60","70"};
cbx = new JComboBox(elements_x);
cbx.addActionListener(this);
cbx.setActionCommand("cbx");
String[] elements_y= {"10","20","30","40","50","60","70"};
cby = new JComboBox(elements_y);
cby.addActionListener(this);
cby.setActionCommand("cby");
String[] elements_color = {"Red","Blue","Green","Orange","Yellow" };
col = new JComboBox(elements_color);
col.addActionListener(this);
col.setActionCommand("col");
gr = new Graph();
JPanel top = new JPanel(new BorderLayout());
JPanel inputs = new JPanel(new GridLayout(6,1));
inputs.add(button1);
inputs.add(button2);
inputs.add(button3);
inputs.add(button4);
inputs.add(button5);
inputs.add(cbx);
inputs.add(cby);
inputs.add(col);
top.add(gr,BorderLayout.CENTER);
top.add(inputs,BorderLayout.WEST);
getContentPane().add(BorderLayout.CENTER, top);
setSize(500,300);//set window size
//take care of actions
public void actionPerformed(ActionEvent e) {
String command = e.getActionCommand();
if (command.equals("Quit")){
System.exit(0);//terminate program
else if (command.equals("Rectangle")){
//add Rectangle to graph at
//position x,y and with certain color
gr.addRectangle(x,y,color);
else if (command.equals("Circle")){
gr.addCircle(x,y,color);
else if (command.equals("Reset")){
else if (command.equals("Triangle")){
else if (command.equals("Ellipse")){
else if (command.equals("cbx")){
x=Integer.valueOf((String)((JComboBox)e.getSource()).getSelectedItem()).intValue();
else if (command.equals("cby")){
y=Integer.valueOf((String)((JComboBox)e.getSource()).getSelectedItem()).intValue();
else if (command.equals("col")){
String temp=(String)((JComboBox)e.getSource()).getSelectedItem();
if (temp=="Red") color=Color.red;
else if (temp=="Blue") color=Color.blue;
else if (temp=="Green") color=Color.green;
else if (temp=="pink") color=Color.pink;
else if (temp=="lightGray") color=Color.lightGray;
//main program
public static void main(String [] args) {
Frame appl = new Frame();
appl.setVisible(true);
Thanks in advance
Marina

Hi,
You are very lucky that I'm currently boored. You should never tag a question as urgent. It might be urgent to you, but not to us who answer. And you should also use code formatting when you post code (see the formatting tips, or use the code-button).
I made some changes to your Graph class. The most important thing is the abstract draw method that I added to the GeomFigur class.
import java.awt.*;
import javax.swing.*;
import java.util.*;
public class Graph extends JPanel {
    LinkedList figures;
    public Graph() {
        setBackground(Color.white);
        figures = new LinkedList();
    int z;
    abstract class GeomFigur {
        protected Color color;
        public GeomFigur(Color color) {
            this.color = color;
        public abstract void move(Point p);
        public abstract void draw(Graphics g);
    abstract class Line extends GeomFigur {
        Point p1, p2;
        public Line(Color c, Point p1, Point p2) {
            super(c);
            this.p1 = new Point(p1);
            this.p2 = new Point(p2);
        public String toString() {
            return "Line from " + p1 + " to " + p2;
        public void move(Point dist) {
            p1.move(dist.x, dist.y);
            p2.move(dist.x, dist.y);
    class Rectangle extends Line {
        public Rectangle(Color c, Point p1, Point p2) {
            super(c, p1, p2);
        public String toString() {
            return "Rectangle from " + p1 + " to " + p2;
        public void draw(Graphics g) {
            System.out.println("Draw rectangle at " + p1 + " with color " + color);
            g.setColor(Color.black);
            g.drawRect(p1.x, p1.y, 20, 20);
            g.setColor(color);
            g.fillRect(p1.x, p1.y, 20, 20);
    class Circle extends GeomFigur {
        Point centre;
        int radius;
        public Circle(Color c, Point centre, int radius) {
            super(c);
            this.centre = new Point(centre);
            this.radius = radius;
        public String toString() {
            return "Circle, centre " + centre + ", radius " + radius;
        public void move(Point dist) {
            centre.move(dist.x, dist.y);
        public void draw(Graphics g) {
            System.out.println("Draw circle at " + centre + " with color " + color);
            g.setColor(Color.black);
            g.drawOval(centre.x, centre.y, 20, 20);
            g.setColor(color);
            g.fillOval(centre.x, centre.y, 20, 20);
    public void addRectangle(int x, int y, Color col) {
        System.out.println("x,y,col " + x + ":" + y + ":" + col);
        Rectangle r = new Rectangle(col, new Point(x, y), new Point(x + 20, y + 20));
        figures.addLast(r);
        repaint();
    public void addCircle(int x, int y, Color col) {
        System.out.println("x,y,col" + x + ":" + y + ":" + col);
        Circle c = new Circle(col, new Point(x, y), 1);
        figures.addLast(c);
        repaint();
    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        for (int i = 0; i < figures.size(); i++) {
            GeomFigur drawable = (GeomFigur)figures.get(i);
            drawable.draw(g);
}/Kaj

JDBC help needed ; java.lang.NoClassDefFoundError:test1

hi, everyone, i had a problem when i run my own app to connect javadb in embedded mode
i ve added the ~/javadb/lib/derby.jar to CLASSPATH
and ~/javadb/lib/derby.jar:~/javadb/lib/derbytools.jar to DERBY_HOME
but there is a problem said my own application class cannot be found.
here is my code:
import java.sql.*;
class test1
public static void main (String args [])
       throws SQLException
     try {
        Class.forName("org.apache.derby.jdbc.EmbeddedDriver");
    } catch (Exception e) {
        System.out.println("ERROR: failed to load javadb JDBC driver.");
        e.printStackTrace();
        return;
      Connection conn = DriverManager.getConnection("jdbc:derby:testdb");
try{
     Statement stmt1 = conn.createStatement();
        ResultSet rset1 = stmt1.executeQuery( "SELECT * FROM PART" );
     long counter1 = 0;
        double price1;
     while ( rset1.next() )
         price1 = rset1.getDouble(8);
         if (price1 == 1306.4)
          counter1++;
     System.out.println( counter1 );
     stmt1.executeQuery("SHUTDOWN");
     conn.close();
   catch (SQLException e )
     String errmsg = e.getMessage();
     System.out.println( errmsg );
}and i ve followed one Derby JDBC tutorial on the internet,
* AutoLoadJdbcDriver.java
* Copyright (c) 2007 by Dr. Herong Yang. All rights reserved.
import java.sql.*;
import java.util.*;
public class AutoLoadJdbcDriver {
public static void main(String [] args) {
    Connection con = null;
    try {
      listDrivers();
// Find the driver for a given URL
      Driver driverClass = (Driver) DriverManager.getDriver(
        "jdbc:derby://somehost/somedb");
      System.out.println("\nDriver for jdbc:derby://somehost/somedb");
      System.out.println("   "+driverClass.getClass().getName());
      listDrivers();
    } catch (Exception e) {
      System.err.println("Exception: "+e.getMessage());
private static void listDrivers() {
    Enumeration driverList = DriverManager.getDrivers();
    System.out.println("\nList of drivers:");
    while (driverList.hasMoreElements()) {
      Driver driverClass = (Driver) driverList.nextElement();
      System.out.println("   "+driverClass.getClass().getName());
The output below confirms that the DriverManager class is able to load any JDBC driver classes as long as their JAR files are included in the classpath.
C:\>javac AutoLoadJdbcDriver.java
C:\>java -cp .;\local\javadb\lib\derbyclient.jar AutoLoadJdbcDriver
List of drivers:
sun.jdbc.odbc.JdbcOdbcDriver
org.apache.derby.jdbc.ClientDriver
Driver for jdbc:derby://somehost/somedb
org.apache.derby.jdbc.ClientDriver
List of drivers:
sun.jdbc.odbc.JdbcOdbcDriver
org.apache.derby.jdbc.ClientDriver
but on my machine , it keep telling me the massage
Exception in thread "main" java.lang.NoClassDefFoundError: SimpleApp
Exception in thread "main" java.lang.NoClassDefFoundError: test1
Exception in thread "main" java.lang.NoClassDefFoundError: AutoLoadJdbcDriver
the ij works well
and the other java app(without jdbc) works well.
anybody can help me to solve this problem?
Edited by: Xiao on Jan 18, 2008 6:19 PM

but on my machine , it keep telling me the massage
Exception in thread "main" java.lang.NoClassDefFoundError: SimpleApp
Exception in thread "main" java.lang.NoClassDefFoundError: test1
Exception in thread "main" java.lang.NoClassDefFoundError: AutoLoadJdbcDriverI assume you get these messages when you try and run the three programs mentioned (SimpleApp, test1 and AutoLoadJdbcDriver).
What commands do you use to do this? What does the command line report the CLASSPATH to be (using the echo command)?
The simplest cause would be that you have the derby jar mentioned as part of CLASSPATH, but not the current directory.

Help needed in threads

hi,
Iam using the stop() from the API.But since it is deprecated I dont want to use it.Is there any way by which I could replace it ?I need to make changes in thousands of files.
Any sample code for avoiding stop() wud be of immense help.

Slightly at a tangent, but why
while (true) {
synchronized (mutex) {
if (running) {
//execute some task
mutex.wait(500);
} else {
break; //will break from while(true) loop
}instead of
while (running) {
//execute some task
synchronized(mutex);
mutex.wait(500);
Often VM's interpretation of what volatile means can differ from each other and it is my experience that in the past various VMs have been buggy with volatile variables. Hence to be doubly sure I want to ensure that access to the "running" variable is synchronized.
synchronized (mutex) {
while (running) {
    //execute some task
    mutex.wait(500);
}is equivalent to my code above of course and I could (should) have used this. The reason is that I did a cut-and-paste job with some hasty alterations where for various reasons I wanted to re-do a check before waiting and also cede the mutex inbetween executing the task and waiting. Apologies for any confusion.
The reason I ask is that I've never found a use for
"break".I'm not mad-keen on it either as it isn't very good practice IMHO but it was quite useful where I have used it.

A novice in need of help --- Need JAVA GOD

Hello everyone, i would appreciate any help anyone can give me. I am tyring to make a connection to Oracle via Java and make some tables. what am i doing wrong?
package edu.uwec.cs.jorandbe.assignment5;
import java.awt.HeadlessException;
import java.sql.*;
import javax.swing.*;
public class OracleDBConnection {
String username;
String host;
String password;
Driver theOracleDriver;
Connection myConn;
String sqlQuery;
ResultSet rs;
Statement stmt;
public OracleDBConnection() {
public OracleDBConnection(String hostn, String usern, String passw) {
this.host = hostn;
this.username = usern;
this.password = passw;
public void Open() {
try {
theOracleDriver = (Driver) (Class
.forName("oracle.jdbc.driver.OracleDriver")).newInstance();
DriverManager.registerDriver(theOracleDriver);
Connection myConn = DriverManager.getConnection(this.host,
this.username, this.password);
stmt = myConn.createStatement();
} catch (InstantiationException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
public void Close() {
try {
if (rs != null)
rs.close();
if (myConn != null)
myConn.close();
if (stmt != null)
stmt.close();
} catch (SQLException e) {
e.printStackTrace();
public void setQueryString(String Query) {
sqlQuery = Query;
public void getQueryString(String Query) {
System.out.println("Current SqlQuery : " + sqlQuery);
//public String [][] executeSELECT() {
//rs = stmt.executeUpdate(sql);
// return rs;
public static void main(String[] args) {
OracleDBConnection Oracle1 = new OracleDBConnection("jdbc:oracle:thin:@stef.cs.uwec.edu:1521:csdev","Jorandbe","j8114");
//CLASS 2
package edu.uwec.cs.jorandbe.assignment5;
public class NFL_DDL {
     public static void main(String[] args) {
          OracleDBConnection Oracle1 = new OracleDBConnection("jdbc:oracle:thin:@stef.cs.uwec.edu:1521:csdev","Jorandbe","j8114");
Oracle1.Open();
Oracle1.Close();
public void createTables(Object Oracle1){
//Oracle1.Open();
can anyone tell me why Oracle1.Oen(); works in my main method
but in my create Table method as well??

public class NFL_DDL {
     public static void main(String[] args) {
          OracleDBConnection Oracle1 = new OracleDBConnection("jdbc:oracle:thin:@stef.cs.uwec.edu:1521:csdev","Jorandbe","j8114");
Oracle1.Open();
Oracle1.Close();
public void createTables(Object Oracle1){
//Oracle1.Open();
In the main up top, i can get the connection to open/ Oarcle1.Open works and it gives me no compile errors
but when i try to do the same thing in the createTables it gives me the evil red line under open and says
"The method Open() is undefined for the type Object"Where are you calling the createTables method ? How will the compiler know that it has to start off with the createTables ?
Open() is not a static method either ...?!?!?!?
what are you trying to do ?

Help with Java Threads

Hello,
Can anyone help with what I'm trying to do:
I would like to create a thread such as:
Database connection successful....
where the '...' keep moving up. So as long as there is a database connection the '...'s should keep moving like so:
...... then back to:
Does that make sense?
Thanks
am328

What you want to do if really very simple...
Why don't you first write a simple loop that generates your '.'s. Once you get that working, wrap the loop inside a thread that checks for a database connection.

JPA help needed(Java Persistence)

Hi friends ,
Is there any demo for JPA ,
I have to perform Java Persistence ,
I have the underlying tables , and I have to access and manipulate them , just like Java objects

Yordon when I tried to test my service I got this error
em is my Entity manager instance
javax.ejb.EJBException: Cannot perform injection over bean instance [email protected]5db311 for bean demo.sap.com/jpacasear*annotation|demo.sap.comjpacas~ejbmodule.jar*annotation|com.sap.demo.jpacas.modeled.appsrv.jpaservice.jpaservice; nested exception is: com.sap.engine.lib.injection.InjectionException: Injection on field em of instance [email protected]5db311 failed. Could not get a value to be injected from the factory.:
com.sap.engine.services.ejb3.util.pool.PoolException: javax.ejb.EJBException: Cannot perform injection over bean instance [email protected]5db311 for bean demo.sap.com/jpacas~ear*annotation|demo.sap.com~jpacas~ejbmodule.jar*annotation|com.sap.demo.jpacas.modeled.appsrv.jpaservice.jpaservice; nested exception is: com.sap.engine.lib.injection.InjectionException: Injection on field em of instance [email protected]5db311 failed. Could not get a value to be injected from the factory.
at com.sap.engine.services.ejb3.util.pool.ContainerPool.translate(ContainerPool.java:288)
at com.sap.engine.services.ejb3.util.pool.ContainerPoolImpl.doResizeOneStepUp(ContainerPoolImpl.java:378)
at com.sap.engine.services.ejb3.util.pool.ContainerPoolImpl.ensureNotEmpty(ContainerPoolImpl.java:342)
at com.sap.engine.services.ejb3.util.pool.ContainerPoolImpl.pop(ContainerPoolImpl.java:309)
at com.sap.engine.services.ejb3.runtime.impl.StatelessInstanceLifecycleManager.getMethodReady(StatelessInstanceLifecycleManager.java:64)
at com.sap.engine.services.ejb3.runtime.impl.Interceptors_StatelessInstanceGetter.invoke(Interceptors_StatelessInstanceGetter.java:14)
at com.sap.engine.services.ejb3.runtime.impl.AbstractInvocationContext.proceed(AbstractInvocationContext.java:177)
at com.sap.engine.services.ejb3.runtime.impl.Interceptors_SecurityCheck.invoke(Interceptors_SecurityCheck.java:21)
at com.sap.engine.services.ejb3.runtime.impl.AbstractInvocationContext.proceed(AbstractInvocationContext.java:177)
at com.sap.engine.services.ejb3.runtime.impl.Interceptors_ExceptionTracer.invoke(Interceptors_ExceptionTracer.java:16)
at com.sap.engine.services.ejb3.runtime.impl.AbstractInvocationContext.proceed(AbstractInvocationContext.java:177)
at com.sap.engine.services.ejb3.runtime.impl.DefaultInvocationChainsManager.startChain(DefaultInvocationChainsManager.java:133)
at com.sap.engine.services.ejb3.runtime.impl.DefaultEJBProxyInvocationHandler.invoke(DefaultEJBProxyInvocationHandler.java:164)
at $Proxy367_10002.getDetails(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at com.sap.caf.rt.services.serviceaccess.ServiceWrapper.findByDataObject(ServiceWrapper.java:330)
at com.sap.caf.rt.services.serviceaccess.CAFServiceAccessBeanImpl.findByDataObject(CAFServiceAccessBeanImpl.java:230)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at com.sap.engine.services.ejb3.runtime.impl.RequestInvocationContext.proceedFinal(RequestInvocationContext.java:43)
at com.sap.engine.services.ejb3.runtime.impl.AbstractInvocationContext.proceed(AbstractInvocationContext.java:166)
at com.sap.engine.services.ejb3.runtime.impl.Interceptors_StatesTransition.invoke(Interceptors_StatesTransition.java:19)
at com.sap.engine.services.ejb3.runtime.impl.AbstractInvocationContext.proceed(AbstractInvocationContext.java:177)
at com.sap.engine.services.ejb3.runtime.impl.Interceptors_Resource.invoke(Interceptors_Resource.java:71)
at com.sap.engine.services.ejb3.runtime.impl.AbstractInvocationContext.proceed(AbstractInvocationContext.java:177)
at com.sap.engine.services.ejb3.runtime.impl.Interceptors_StatefulTransactionAssociation.invoke(Interceptors_StatefulTransactionAssociation.java:43)
at com.sap.engine.services.ejb3.runtime.impl.AbstractInvocationContext.proceed(AbstractInvocationContext.java:177)
at com.sap.engine.services.ejb3.runtime.impl.AbstractInvocationContext.proceed(AbstractInvocationContext.java:189)
at com.sap.engine.services.ejb3.runtime.impl.Interceptors_StatefulSessionInstanceGetter.invoke(Interceptors_StatefulSessionInstanceGetter.java:37)
at com.sap.engine.services.ejb3.runtime.impl.AbstractInvocationContext.proceed(AbstractInvocationContext.java:177)
at com.sap.engine.services.ejb3.runtime.impl.Interceptors_Transaction.doWorkWithAttribute(Interceptors_Transaction.java:38)
at com.sap.engine.services.ejb3.runtime.impl.Interceptors_Transaction.invoke(Interceptors_Transaction.java:22)
at com.sap.engine.services.ejb3.runtime.impl.AbstractInvocationContext.proceed(AbstractInvocationContext.java:177)
at com.sap.engine.services.ejb3.runtime.impl.Interceptors_SecurityCheck.invoke(Interceptors_SecurityCheck.java:21)
at com.sap.engine.services.ejb3.runtime.impl.AbstractInvocationContext.proceed(AbstractInvocationContext.java:177)
at com.sap.engine.services.ejb3.runtime.impl.Interceptors_ExceptionTracer.invoke(Interceptors_ExceptionTracer.java:16)
at com.sap.engine.services.ejb3.runtime.impl.AbstractInvocationContext.proceed(AbstractInvocationContext.java:177)
at com.sap.engine.services.ejb3.runtime.impl.DefaultInvocationChainsManager.startChain(DefaultInvocationChainsManager.java:133)
at com.sap.engine.services.ejb3.runtime.impl.DefaultEJBProxyInvocationHandler.invoke(DefaultEJBProxyInvocationHandler.java:164)
at com.sap.engine.services.ejb3.runtime.impl.StatefulBMProxyInvocationHandler.invoke(StatefulBMProxyInvocationHandler.java:55)
at $Proxy103_10002.findByDataObject(Unknown Source)
at com.sap.caf.rt.ui.esf.BONodeServiceAccess.findBy(BONodeServiceAccess.java:296)
at com.sap.caf.rt.ui.esf.Query.execute(Query.java:222)
at com.sap.caf.ui.servicebrowser.components.visualizer.controllers.TableViewCC.execute(TableViewCC.java:353)
at com.sap.caf.ui.servicebrowser.components.visualizer.controllers.wdp.InternalTableViewCC.execute(InternalTableViewCC.java:181)
at com.sap.caf.ui.servicebrowser.components.visualizer.views.TableViewCV.onActionExcuteQuery(TableViewCV.java:429)
at com.sap.caf.ui.servicebrowser.components.visualizer.views.wdp.InternalTableViewCV.wdInvokeEventHandler(InternalTableViewCV.java:342)
at com.sap.tc.webdynpro.progmodel.generation.DelegatingView.invokeEventHandler(DelegatingView.java:131)
at com.sap.tc.webdynpro.progmodel.controller.Action.fire(Action.java:72)
at com.sap.tc.webdynpro.clientserver.phases.ProcessingEventPhase.doHandleActionEvent(ProcessingEventPhase.java:156)
at com.sap.tc.webdynpro.clientserver.phases.ProcessingEventPhase.execute(ProcessingEventPhase.java:91)
at com.sap.tc.webdynpro.clientserver.window.WindowPhaseModel.processRequestPartly(WindowPhaseModel.java:161)
at com.sap.tc.webdynpro.clientserver.window.WindowPhaseModel.doProcessRequest(WindowPhaseModel.java:109)
at com.sap.tc.webdynpro.clientserver.window.WindowPhaseModel.processRequest(WindowPhaseModel.java:96)
at com.sap.tc.webdynpro.clientserver.window.WebDynproWindow.processRequest(WebDynproWindow.java:469)
at com.sap.tc.webdynpro.clientserver.cal.AbstractClient.executeTasks(AbstractClient.java:52)
at com.sap.tc.webdynpro.clientserver.cal.ClientApplication.doExecute(ClientApplication.java:1388)
at com.sap.tc.webdynpro.clientserver.cal.ClientApplication.doProcessing(ClientApplication.java:1208)
at com.sap.tc.webdynpro.serverimpl.core.sessionctx.AbstractExecutionContextDispatcher.delegateToApplicationDoProcessing(AbstractExecutionContextDispatcher.java:145)
at com.sap.tc.webdynpro.serverimpl.wdc.sessionctx.DispatchHandlerForAppProcessing.doService(DispatchHandlerForAppProcessing.java:35)
at com.sap.tc.webdynpro.serverimpl.wdc.sessionctx.AbstractDispatchHandler.service(AbstractDispatchHandler.java:116)
at com.sap.engine.services.servlets_jsp.server.deploy.impl.module.IRequestDispatcherImpl.dispatch(IRequestDispatcherImpl.java:93)
at com.sap.tc.webdynpro.serverimpl.wdc.sessionctx.ExecutionContextDispatcher.dispatchToApplicationDoProcessing(ExecutionContextDispatcher.java:114)
at com.sap.tc.webdynpro.serverimpl.core.sessionctx.AbstractExecutionContextDispatcher.dispatch(AbstractExecutionContextDispatcher.java:80)
at com.sap.tc.webdynpro.clientserver.session.ApplicationSession.dispatch(ApplicationSession.java:506)
at com.sap.tc.webdynpro.clientserver.session.ApplicationSession.dispatch(ApplicationSession.java:526)
at com.sap.tc.webdynpro.clientserver.session.ApplicationSession.doApplicationProcessingStandalone(ApplicationSession.java:457)
at com.sap.tc.webdynpro.clientserver.session.ApplicationSession.doProcessing(ApplicationSession.java:248)
at com.sap.tc.webdynpro.clientserver.session.ClientSession.doApplicationProcessing(ClientSession.java:698)
at com.sap.tc.webdynpro.clientserver.session.ClientSession.doProcessing(ClientSession.java:230)
at com.sap.tc.webdynpro.clientserver.session.RequestManager.doProcessing(RequestManager.java:228)
at com.sap.tc.webdynpro.serverimpl.core.sessionctx.AbstractExecutionContextDispatcher.delegateToRequestManager(AbstractExecutionContextDispatcher.java:192)
at com.sap.tc.webdynpro.serverimpl.wdc.sessionctx.DispatchHandlerForRequestManager.doService(DispatchHandlerForRequestManager.java:38)
at com.sap.tc.webdynpro.serverimpl.wdc.sessionctx.AbstractDispatchHandler.service(AbstractDispatchHandler.java:116)
at com.sap.engine.services.servlets_jsp.server.deploy.impl.module.IRequestDispatcherImpl.dispatch(IRequestDispatcherImpl.java:93)
at com.sap.tc.webdynpro.serverimpl.wdc.sessionctx.ExecutionContextDispatcher.dispatchToRequestManager(ExecutionContextDispatcher.java:140)
at com.sap.tc.webdynpro.serverimpl.core.sessionctx.AbstractExecutionContextDispatcher.dispatch(AbstractExecutionContextDispatcher.java:92)
at com.sap.tc.webdynpro.serverimpl.core.sessionctx.AbstractExecutionContextDispatcher.dispatch(AbstractExecutionContextDispatcher.java:104)
at com.sap.tc.webdynpro.serverimpl.core.AbstractDispatcherServlet.doContent(AbstractDispatcherServlet.java:87)
at com.sap.tc.webdynpro.serverimpl.core.AbstractDispatcherServlet.doPost(AbstractDispatcherServlet.java:61)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
at com.sap.engine.services.servlets_jsp.server.Invokable.invoke(Invokable.java:66)
at com.sap.engine.services.servlets_jsp.server.Invokable.invoke(Invokable.java:32)
at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.runServlet(HttpHandlerImpl.java:431)
at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.handleRequest(HttpHandlerImpl.java:289)
at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:387)
at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:376)
at com.sap.engine.services.servlets_jsp.filters.ServletSelector.process(ServletSelector.java:85)
at com.sap.engine.services.httpserver.chain.AbstractChain.process(AbstractChain.java:71)
at com.sap.engine.services.servlets_jsp.filters.ApplicationSelector.process(ApplicationSelector.java:160)
at com.sap.engine.services.httpserver.chain.AbstractChain.process(AbstractChain.java:71)
at com.sap.engine.services.httpserver.filters.WebContainerInvoker.process(WebContainerInvoker.java:67)
at com.sap.engine.services.httpserver.chain.HostFilter.process(HostFilter.java:9)
at com.sap.engine.services.httpserver.chain.AbstractChain.process(AbstractChain.java:71)
at com.sap.engine.services.httpserver.filters.ResponseLogWriter.process(ResponseLogWriter.java:60)
at com.sap.engine.services.httpserver.chain.HostFilter.process(HostFilter.java:9)
at com.sap.engine.services.httpserver.chain.AbstractChain.process(AbstractChain.java:71)
at com.sap.engine.services.httpserver.filters.DefineHostFilter.process(DefineHostFilter.java:27)
at com.sap.engine.services.httpserver.chain.ServerFilter.process(ServerFilter.java:12)
at com.sap.engine.services.httpserver.chain.AbstractChain.process(AbstractChain.java:71)
at com.sap.engine.services.httpserver.filters.MonitoringFilter.process(MonitoringFilter.java:29)
at com.sap.engine.services.httpserver.chain.ServerFilter.process(ServerFilter.java:12)
at com.sap.engine.services.httpserver.chain.AbstractChain.process(AbstractChain.java:71)
at com.sap.engine.services.httpserver.server.Processor.chainedRequest(Processor.java:309)
at com.sap.engine.services.httpserver.server.Processor$FCAProcessorThread.run(Processor.java:222)
at com.sap.engine.core.thread.impl3.ActionObject.run(ActionObject.java:37)
at java.security.AccessController.doPrivileged(Native Method)
at com.sap.engine.core.thread.impl3.SingleThread.execute(SingleThread.java:152)
at com.sap.engine.core.thread.impl3.SingleThread.run(SingleThread.java:247)
Caused by: javax.ejb.EJBException: Cannot perform injection over bean instance [email protected]5db311 for bean demo.sap.com/jpacas~ear*annotation|demo.sap.com~jpacas~ejbmodule.jar*annotation|com.sap.demo.jpacas.modeled.appsrv.jpaservice.jpaservice; nested exception is: com.sap.engine.lib.injection.InjectionException: Injection on field em of instance [email protected]5db311 failed. Could not get a value to be injected from the factory.
at com.sap.engine.services.ejb3.runtime.impl.Interceptors_DependencyInjection.invoke(Interceptors_DependencyInjection.java:25)
at com.sap.engine.services.ejb3.runtime.impl.Interceptors_EJBContext30DependencyInjection.invoke(Interceptors_EJBContext30DependencyInjection.java:11)
at com.sap.engine.services.ejb3.runtime.impl.AbstractInvocationContext.proceed(AbstractInvocationContext.java:177)
at com.sap.engine.services.ejb3.runtime.impl.Interceptors_StatesTransition.invoke(Interceptors_StatesTransition.java:19)
at com.sap.engine.services.ejb3.runtime.impl.AbstractInvocationContext.proceed(AbstractInvocationContext.java:177)
at com.sap.engine.services.ejb3.runtime.impl.Interceptors_ApplicationInstancesCreator.invoke(Interceptors_ApplicationInstancesCreator.java:53)
at com.sap.engine.services.ejb3.runtime.impl.AbstractInvocationContext.proceed(AbstractInvocationContext.java:177)
at com.sap.engine.services.ejb3.runtime.impl.Interceptors_Resource.invoke(Interceptors_Resource.java:71)
at com.sap.engine.services.ejb3.runtime.impl.AbstractInvocationContext.proceed(AbstractInvocationContext.java:177)
at com.sap.engine.services.ejb3.runtime.impl.AbstractInvocationContext.proceed(AbstractInvocationContext.java:189)
at com.sap.engine.services.ejb3.runtime.impl.Interceptors_NewBeanContext.invoke(Interceptors_NewBeanContext.java:17)
at com.sap.engine.services.ejb3.runtime.impl.AbstractInvocationContext.proceed(AbstractInvocationContext.java:177)
at com.sap.engine.services.ejb3.runtime.impl.DefaultInvocationChainsManager.startCallback(DefaultInvocationChainsManager.java:147)
at com.sap.engine.services.ejb3.runtime.impl.StatelessInstanceLifecycleManager.makeExist(StatelessInstanceLifecycleManager.java:108)
at com.sap.engine.services.ejb3.runtime.impl.StatelessInstanceLifecycleManager.access$000(StatelessInstanceLifecycleManager.java:23)
at com.sap.engine.services.ejb3.runtime.impl.StatelessInstanceLifecycleManager$PoolUserImpl.createObject(StatelessInstanceLifecycleManager.java:34)
at com.sap.engine.services.ejb3.util.pool.ContainerPoolImpl.doResizeOneStepUp(ContainerPoolImpl.java:373)
... 113 more
Caused by: com.sap.engine.lib.injection.InjectionException: Injection on field em of instance [email protected]5db311 failed. Could not get a value to be injected from the factory.
at com.sap.engine.lib.injection.FieldInjector.inject(FieldInjector.java:115)
at com.sap.engine.lib.injection.InjectionMatrix.inject(InjectionMatrix.java:45)
at com.sap.engine.services.ejb3.runtime.impl.Interceptors_DependencyInjection.invoke(Interceptors_DependencyInjection.java:22)
... 129 more
Caused by: com.sap.engine.services.orpersistence.container.exceptions.ResourceException: Persistence unit 'CAR_AL' requested from archive 'demo.sap.com~jpacas~ejbmodule.jar' is not present in application 'demo.sap.com/jpacas~ear' or is not visible to the requested archive.
at com.sap.engine.services.orpersistence.container.ORPersistenceObjectFactory.getPersistenceUnitInfo(ORPersistenceObjectFactory.java:213)
at com.sap.engine.services.orpersistence.container.ORPersistenceObjectFactory.getObjectInstance(ORPersistenceObjectFactory.java:59)
at com.sap.engine.lib.injection.ReferenceObjectFactory.getObject(ReferenceObjectFactory.java:65)
at com.sap.engine.lib.injection.FieldInjector.inject(FieldInjector.java:113)
... 131 more
Close

Help needed: java / fedora printing

A java print test program which used to work on fc4 and xp, now simply does not work on fedora core 5 (fc5). The test programs are here:
http://www.apl.jhu.edu/~hall/java/Swing-Tutorial/Swing-Tutorial-Printing.html
I am using a samsung ml-1750 with the hpijs driver although I do not think this matters.
The app attempts to print a jpanel image first bringing up the print dialog box, and then printing.
When the 'print' button is pressed nothing happens. If 'print to file' is chosen, an empty file is written out.
"regular" printing .e.g of a web page, kedit document etc works fine
Any and all help is appreciated. Thanks
Lou

you can try the following this fine works at my end on CentOS 4
String strCommand = "lpr#"+masterpath+"/"+filename;
                              System.out.println("Cmd="+ strCommand);
                              String[] command=strCommand.split("#");
                              p = rt.getRuntime().exec(command);

HELP needed: java plug-in fatal error

i keep getting this java error whenever certain websites try using my java. (using either IE6 and ff2.0) http://img.photobucket.com/albums/v226/boogleloo/error.jpg
i un-installed older version and got new version of java installed but that made no difference
i do not have a clue where to look how to make the request changes the error wants made... please is someone could assist me with a walk through fix i would be greatly appreciative!
Message was edited by:
boogleloo

Well I got it working on explorer browser but it still wont work on Avant browser which is my favorite any ideas why it will work on one but not the other??

Help needed about Java Threads ?

Hi,
I have a p2p java program that contains many classes, A.java, B.java, etc. It works fine when i send or recieve to eachother one at a time, but I would like to be able to send/recieve things at the same time. So i would probably need to use Java Threads. Can somebody please show me how this is done. I would really appriciate it. Thanks!!
import java.net.*;
import java.io.*;
import java.lang.*;
public class A {
        private static String hostname; //host name
        public A () { }
       public static void send() throws IOException {
                //send code here
        public static void receive() throws IOException{
                //receive code here
        public static void main(String args[]) throws IOException {
                //do both send/recieve at the same time?
                send();
                receieve();
}

Well, I think( this is comming out my rear ) that the scope of the recieve() call is not in the main method anymore but instead in class you've created with "new Thread()" and it's throwing from the public void run() instead. This is a good example of complicated code. I would do this:
(Untested code)
import java.net.*;
import java.io.*;
import java.lang.*;
public class A implements Runnable { // <--- NEW
        private static String hostname; //host name
        public A () { }
        public static void send() throws IOException {
                //send code here
        public static void receive() throws IOException{
                //receive code here
        public static void main(String args[]) throws IOException {
                //do both send/recieve at the same time?
                new Thread( this ).start();
                send();
        /******** NEW ************/
        public void run()
            while( keepListening )
                // It's the assumption that recieve() is
                // throwing the IOException from some net calls
                try {
                   recieve();
                } catch( IOException ioe ) {
                   System.out.println( "IOException in run()\n" + ioe.getMessage();
}

!!!-Need help for terminating a Java thread in real time

Hi everyone!
I use J2SDK1.4.1 on a Unix platform.
I want to terminate (or stop) a running java thread, which is dealing with time consuming tasks, in real-time (for example: the delay before the thread is terminated can't beyond one second), However, I don't know which techniques I can use to make sure the previous (or old) running java threads have been terminated?
Could you please give me any help if you can?
Any suggestion or reply will be kindly appreciated!
Thanks!

Thanks very much, jverd !
I do set a flag that the thread should periodically check !
Well, the scenario is like this:
1. the thread read line by line (using BufferedReader) string from a probably huge-size file
2. analyse each string read from the file if required (some strings may be omitted based on the user's operations), the analyzing process is a time-consuming task, and the analysing process may be terminated at any time the user want.
3. record only the strings that have been analyzed by the previous process into a recording file
The problem I meet is as follows: (Here, I suppose that it should take at least 30 seconds to finish analyse all the strings in a given huge file )
1. the user start the analysing process, and run it for only 5 seconds,then stop the analyzing.
2. the user start the analysing process again from the begining of the file(analyse the strings within the same file as previous step), and then stop the analysing process at 10 second. (it means, this time the analysing process is running for 10 seconds, still haven't finish analyse all the strings in the file).
Once I open the record file, I saw some of the strings in the recording file have been repetitively record for 2 times, and the repetitive strings are just the strings the analysing time from at 5 second to at 10 second.
And the repetitive times are depend on how many time the user start and stop the analysing process using the same file. for example, based on the above two steps, the user do the third step as follow:
3. the user start the analysing process once again, analyse the same file,too. And run it for 15 seconds
This time open the recording file, this time I saw some of the strings have been repetitively record for 3 times, and the repetitive strings are just the strings the analysing time from at 10 second to at 15 second.
So, I guess the problem is probably because the previous analysing threads haven't been terminated completely, or say they just are blocked or set as inactive etc., then when the next time start the analysing process, the old threads will be reactive,and rerun ffrom the last time they are blocked.
I hope you had catched what I mean, if you not, please ust let me know, I'll try to explain it again.
Thanks once again!

Help Needed - Java Threads

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