Java terminating other programs

Hi,
Is there a way to write a java program that will terminate other programs? i.e. if I have internet explorer and firefox open, can I write a java program that will terminate the two browsers? Thanks

pb,
No,
internet explorer = windows
kill = unix
It's a piece of cake in VB6... so I presume there's an winblows API for it.

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Help needed with operating java on other programs

I have a fairly difficult (I think) question.
I am trying to create a program to enact itself on other programs.
It needs to perform 4 functions.
1) Open an exe (such as notepad)
2) Use the exe to open another file (such as a .txt)
3) Find the color of a specific pixel on the screen (ie, (300,800)) and
4) Pull a number from a field in the program
I would apprieciate any help on this, whether in the form of an answer, or a url that could help me with it.
thanks

you could try shell commands to the dos prompt like:
try {
     Properties systemProps = System.getProperties();
     String osVersion = systemProps.getProperty("os.name");
     if (osVersion.equals("Windows 98"))     {
          Runtime.getRuntime().exec("start \"notepad"");
     else if (osVersion.equals("Windows 95"))     {
          Runtime.getRuntime().exec("start \"notepad"");
     else { // win nt (2000 or xp)
          Runtime.getRuntime().exec("cmd.exe /c notepad");
     }catch(IOException err) {}Or locate the notepad.exe and use the runtime class to launch it, to open a txt file is exactly the same but substitute the txt file name instead of notepad, that should launch notepad and open the txt in it, if you mean open notepad and then control it and open a file, that java can?t do, need another language to do it or work with another language and java together. Not sure about the rest,

Using Terminal to program and test java.

I bought a book on java and it says I should not use a JDK when first learning java.
Right or wrong I would like to know how to use terminal to program and compile simple scripts.
So my question is:
How do you go about setting up the computer to use terminal to write and compile a java program?
I know that’s pretty big question. I just need a link to some info on how to get started using terminal and java.
If I use a text editor how do I set up a path to it using javac?
Where can I find or link to this kind of info?

David Bixler wrote:
I bought a book on java and it says I should not use a JDK when first learning java.
I think they mean IDE, considering that Java is the JDK. And I agree with that idea, not just for Java, but for any language.
How do you go about setting up the computer to use terminal to write and compile a java program?
There isn't anything to setup. Just run Terminal and type "vi hello.java" or "nano hello.java". To compile, type "javac hello.java".
I know that’s pretty big question. I just need a link to some info on how to get started using terminal and java.
That is not necessarily a big question, just fundamental. Try Google. It becomes second nature after a couple of decades so I don't really know where to tell you to look. People do tend to have a big list of links, hopefully they can contribute some.
If I use a text editor how do I set up a path to it using javac?
It should already be in your path.
Where can I find or link to this kind of info?
Try Google. People like it. You should find many pages similar to this.

How to create a java card library (jar file to be used in other programs)

Hi all,
I am working on JCOP and writing quite a bit of applets for the java card . Now i have lots of code that could be reusable for example sending SMS, encryption routine, etc.. So this part of the code i want to put into a utility class and create a package out of it. This utility package i must be able to import into my programs what i write.
I tried the normal way of creating the jar by renaming the CAP file of the utility class, also tried including the /javacard/* files also into the jar file as indicated by sfarmer(active forum member here). But none seems to work. I tried contacting NXP folks and they indicated that it may be possible only by way of Sharable Objects.
But some how i am not convinced why i should use Sharable object for this. So if any one can throw some light into this regard it will be immensely helpful to me and my project.
Regards
Prakash

Hi,
Well the variable defined are as below
public static byte[] msgdata = new byte[255];
private static final byte[] HEADER_TEMPLATE = {
          (byte) 0x81, (byte) 0x03, (byte) 0x01, (byte) 0x21, (byte) 0x00, // Command details tag
               (byte) 0x82, (byte) 0x02, (byte) 0x81, (byte) 0x02, // Device Identities tag
               (byte) 0x8D, // Text String tag
               (byte) 0x00, // length
               (byte) 0x04, // Text String tag
the msgdata is declared public so that i can access this as a Class member in my other program doing Utilities.msgdata. But the problem is now that if i dont declare it as final then the compiler gives me the below error
"library has initialized array for non-final, non-static field Utilities, msgdata, [B, attr jc-field: tok 0, public static"
If i make it final then i cannot change it... So now i am stuck..
Any help will be highly appreciated...
Regards
Prakash

(Urgent) Using java to invoke other programs

Guys..
is there any way possible to use java to invoke other programs
eg. java.open(TextPad) or java.execute(NotePad)
something like this
Thx guys

Well... im onli 19 and im an interm in a company. My
boss wanted me to help him look for some ways to do
some process.. So actually this is my 1st time trying
out this java forum. I didn't know that you guys took
such a serious views at screen nick... Forgive me for
my ignorance.I actually don't care that much about it, but you might consider changing it for the reasons I gave. You are only 19 now, and might not be an experienced developer, but you will become one later on (if you continue with Java development), and your account can in that case be an asset for you.
Kaj

Interfacing a java program with other programs

Hi there.
I'm curently working on a project which will involve communication between a java program (the project) and other programs, not necessarily in java.
I know there is the good old "socket method" to handle the communication, but ... are there any other methods ?
Thanks for help.

Communication... what's that?
Have the two programs share a database. Have them send e-mails to each other... the list goes on.

Help! how to run other programs using java

how can i run other programs or exe files using java, anyone can give sample codes for this.
ex. if I click [run MsWord] button, then msWord automatically lunch

RunTime.getRuntime().exec(string command)
I guess, it might help you..java.lang.Runtime

Subtle bug in Deitel & Deitel "Java How to Program" book

Merry x mas and happy new year, guys.
I have this applet (which is at the same time runnable and listener) its printed in Deitel & Deitel "Java How to Program" book 3rd ed.
The program works but as you turn on and off the "suspend" checkboxes some of the threads are not notified, so they go to infinite wait state, deadlock. I couldn't figure out what is wrong or how to fix the problem.. please read the code below, or copy and paste this code to your eclipse, its just one file, then play with the check boxes, some of the threads don't wake up after wait... technically they don't shift from WAITING to TIMED_WAITING state.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
* @author
// Fig. 15.7: RandomCharacters.java
// Demonstrating the Runnableinterface
public class RandomCharacters extends JApplet implements Runnable, ActionListener {
    private String alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    private JLabel outputs[];
    private JCheckBox checkboxes[];
    private final static int SIZE = 3;
    private Thread threads[];
    private boolean suspended[];
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        checkboxes = new JCheckBox[SIZE];
        threads = new Thread[SIZE];
        suspended = new boolean[SIZE];
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            outputs[i] = new JLabel();
            outputs.setBackground(Color.green);
outputs[i].setOpaque(true);
c.add(outputs[i]);
checkboxes[i] = new JCheckBox("Suspended");
checkboxes[i].addActionListener(this);
c.add(checkboxes[i]);
public void start() {
// create threads and start every time start is called
for (int i = 0; i < threads.length; i++) {
threads[i] = new Thread(this, "Thread " + (i + 1));
threads[i].start();
public void run() {
Thread currentThread = Thread.currentThread();
int index = getIndex(currentThread);
char displayChar;
while (threads[index] == currentThread) {
// sleep from 0 to 1 second
try {
Thread.sleep((int) (Math.random() * 1000));
synchronized (this) {
while (suspended[index]
&& threads[index] == currentThread) {
wait();
} catch (InterruptedException e) {
System.err.println("sleep interrupted");
displayChar = alphabet.charAt(
(int) (Math.random() * 26));
outputs[index].setText(currentThread.getName() + ": " + displayChar);
System.err.println(currentThread.getName() + " terminating");
private int getIndex(Thread current) {
for (int i = 0; i < threads.length; i++) {
if (current == threads[i]) {
return i;
return -1;
public synchronized void stop() {
// stop threads every time stop is called
// as the user browses another Web page
for (int i = 0; i < threads.length; i++) {
threads[i] = null;
notifyAll();
public synchronized void actionPerformed(ActionEvent e) {
for (int i = 0; i < checkboxes.length; i++) {
if (e.getSource() == checkboxes[i]) {
suspended[i] = !suspended[i];
outputs[i].setBackground(
!suspended[i] ? Color.green : Color.red);
if (!suspended[i]) {
notify();
return;
Thanks in advance.

Abiel wrote:
No, notifyAll() is used to tell the threads that we're stopping.... see that it's written in the stop() method of the applet. Eg if the user browses away from our applet we set the array of threads to null and notify them all. So notifyAll() makes sense.Yes, it does make sense there too (!!!!!!!).
However, I gave it a try with what u suggested, and it didn't work (as expected) .... Apparently you did not really read my suggestion or my explanation. If you had, you'd have expected it to work and it would have worked.
the problems still remains, some threads are getting in wait state even if their check box is not suspended.Maybe you should add the following code to understand the root cause and solution.
    System.out.println("Thread " + index + " will wait to be notified.");
    wait();
    System.out.println("Thread " + index + " was notified.");
what could the problem be?Improper use of notify()
With kind regards
Ben

How to capture graphical outputs from other programs

Does anyone know how we capture the graphical outputs from the other programs and show them
on the swing?
I'd like to use a java program to run gnuplot, capture the outputs, and show them using swing.

Depends on what you mean by "graphic outputs".
Taking a quick glance at the gnuplot homepage, it looks as if you can output to PNG files, so just run the app, and load the png file.

How to find out top 10 records from the R/3 using Java code (WD Program)

Hi Experts,
I have used Java Web Dynpro program to fetch records from the backend. Following code helps me and fetches record. As per the customer reqirement, we have to fetch only top 10 records (Actual Cost) from the backend. So I have to modify the Java code. How I can do so? Please help.
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Regards,
Gary

Dear SDN Users,
This is how I resolved the issue.
1) Requested ABAPer to provide me sorted data. The data has been sorted in descending order of actual_cost.
2) After that I used following code. This resolved the issue.
     if (wdContext.nodeItab_Final1().size()>10){
     IPublicCostcnt.IGraphDataElement categoryElement;
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          categoryElement = wdContext.createGraphDataElement();
          categoryElement.setCostElement(""+ wdContext.nodeItab_Final1().getItab_Final1ElementAt(i).getDescription());
          categoryElement.setActualCost(wdContext.nodeItab_Final1().getItab_Final1ElementAt(i).getActual_Cost().toString());
          categoryElement.setPlannedCost(wdContext.nodeItab_Final1().getItab_Final1ElementAt(i).getPlan_Cost().toString());
          wdContext.nodeGraphData().addElement(categoryElement);
     if (wdContext.nodeItab_Final1().size()<=10){
     if (wdContext.nodeItab_Final1().size()>0){
     IPublicCostcnt.IGraphDataElement categoryElement;
          for (int i = 0; i < wdContext.nodeItab_Final1().size(); i++) {
          categoryElement = wdContext.createGraphDataElement();
          categoryElement.setCostElement(""+ wdContext.nodeItab_Final1().getItab_Final1ElementAt(i).getDescription());
          categoryElement.setActualCost(wdContext.nodeItab_Final1().getItab_Final1ElementAt(i).getActual_Cost().toString());
          categoryElement.setPlannedCost(wdContext.nodeItab_Final1().getItab_Final1ElementAt(i).getPlan_Cost().toString());
          wdContext.nodeGraphData().addElement(categoryElement);
Regards,
Gary

Handling exception logging in a Java task scheduler program?

I need to design a Task Scheduler Where
1) User should be able to schedule multiple task at the same time.
2) There should be proper error handling on failure of any task and should not affect the other running tasks.
I found the related programme at http://www.roseindia.net/java/example/java/util/CertainAndRepeatTime.shtml
My concern is about handling of point 2 in program provided at above link. Say I schedule a recurring mail send process in above program which will be run first time on 12 september 2011 at 2 am, and will be repeated after every 2 hours Say a one process fais at 8 am. I want to log it in log file with task name and time details. Now if I look at above programme i.e CertainAndRepeatTime.java. This program will exit once it schedules all the tasks. Where and how should handle the logging?
Posted at http://stackoverflow.com/questions/7377204/handling-exception-logging-in-a-java-task-scheduler-program but folks suggesting Quartz scheduler . My Limitation is that i can't for quartz because my project allows me to use only standard java library. Is there any way we can handle logging in the same programme in case of exception.

Well, first of all I wouldn't trust any code from roseindia. So you might want to look for more reliable advice.
As for your logging, you can add it for example to the TimerTask itself. I don't recommend adding logging to that roseindia cr*p though.

Java and abap programing

can any one help as in at freshers level how much of java programing is needed as in in details which all topics and where do u use later, i just know basics of abap.......
Message was edited by: anu raj

I think java will come in handy if you are developing Netweaver portals applications using Web dynpro java or jspdynpage applications. In the latter, it is very important to know java very well. With web dynpro, a lot of the coding is hidden from you, but you still need to know the basics of java and oo programming concepts.
I noticed that you have already marked your post as "solved on my own". I would suggest reversing that unitll your question has been answered completely. When people see the blue star, then usually don't bother to read the post, hence limiting your answers.
Once your question has been answered, award point accorindly. Welcome to SDN!!
Regards,
Rich Heilman

I want to compile java for *.exe program?

I want to compile java for *.exe program?
Thanks

I want to compile java for *.exe program?
ThanksYou're welcome, but the correct answer was allready
given in previous response.oops, late again, must edit.
You're welcome, but the correct answer was allready given in the first response.

Java Server Pages Programming Database Access Error Through Tomcat

Question# 1
I am trying to access MYSQL Database through JAVA Server Pages programming using Tomcat Server as web server on win xp.
Whenever I give following url http://localhost:8080/jspBook/ch1/customers.jsp in web browser , I get followin errors.
HTTP Status 500 -
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:510)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:393)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
root cause
java.lang.NullPointerException
org.apache.jsp.ch1.customers_jsp._jspService(org.apache.jsp.ch1.customers_jsp:96)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:332)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
note The full stack trace of the root cause is available in the Apache Tomcat/5.5.15 logs.
Apache Tomcat/5.5.15
I am facing this problem since one month. I tried searching on google, but could not get concrete answer. I have configured mysqlconnector to connect to mysql and also configured other things in Tomcat's webapps folder. But I could not overcome this error.
Please reply urgently. Thankz for the help and time. ?

<%@ page import="java.sql.*" %>
<%@ page contentType="text/html" %>
<html>
<head>
     <title>Insurance Quoting System</title>
</head>
<body>
<basefont face="Arial">

<%! ResultSet rs = null;%>

<%
     try {
          Class.forName("org.gjt.mm.mysql.Driver");
          Connection db = DriverManager.getConnection(
"jdbc:mysql://localhost:3306/quoting");
          Statement s = db.createStatement();
          rs = s.executeQuery("select * from customer");
     catch (Exception e) {
// For now, just report the error to the system log
     System.out.println(e.toString());
%>

<table width="550" border="0" align="center">
<tr>
<td bgcolor="#006633">
<div align="center">
          <font size="6" color="#FFFFFF"><b>Insurance Quoting System</b></font>
     </div>
</td>
</tr>
<tr>
<td>
<p> </p>
<p> </p>
<p align="center"><b>Customers</b></p>
<table width="290" border="0" align="center">
<%
     try {
          while (rs.next()) {
%>

     <tr>
          <td width="20"><%= rs.getInt(1) %></td>
          <td width="70"><%= rs.getString(2) %></td>
          <td width="70"><%= rs.getString(3) %></td>
          <td width="40">
               <a href="custMaint.jsp?id=<%= rs.getString(1) %>&action=edit">edit
</a>
          </td>
          <td width="40">
               <a href="custMaint.jsp?id=<%= rs.getString(1) %>&action=delete">delete
</a>
          </td>
          <td width="40">
               <a href="custMaint.jsp?id=<%= rs.getString(1) %>&action=newQuote">new quote
</a>
          </td>
     </tr>
<%
     catch (SQLException e) {
     // For now, just report the error to the system log
     System.out.println(e.toString());
%>
</table>
</td>
</tr>
<tr>
     <td>
          <p> </p>
     <p align="center">New Customer</p>
     </td>
</tr>
</table>
</body>
</html>
I have tried all possible configurations of classpath with mysqlconnectorj and Tomcat, but i could not find any solution. Plz help urgently. Thankz a lot.

Your DB connection is probably failing
As a result your result set "rs" is null when you get to it later on, causing a null pointer exception.
Do you need to provide a username/password for your database?
Have you configured your database to allow connections from localhost?
If you haven't already figured it out, doing SQL programming in a JSP is bad practice. Put your SQL code into a java bean / class where it belongs.

Other programs in windows

hi
i was wondering if there was a way to see the text in text boxes in other programs when the user has their mouse over it or just any text box in general. i am trying to make a program that uncovers the asterisks in a password but i am stuck on how to do this. is there a class in the java api that does this? if anyone could help or give me a website address that could help id greatly appreciate it
i would also like to be able to read the keys that the user types while my program is running in the back ground and be able to change what they have written. does anybody kknow of a way to do this?
i know it can be done in visual basic using the windows api. is there a way similar to this in java?
also is this even in the right forum? which one shoudl this be posted in?
thanks

hi
i was wondering if there was a way to see the text in
text boxes in other programs when the user has their
mouse over it or just any text box in general. i am
trying to make a program that uncovers the asterisks
in a password but i am stuck on how to do this. is
there a class in the java api that does this? if
anyone could help or give me a website address that
could help id greatly appreciate itTake a look at the implementation, there isn't ever anything other than asterisks echo'ed into a password textbox--the password never makes it into the box, so there isn't anything to "uncover".
i would also like to be able to read the keys that the
user types while my program is running in the back
ground and be able to change what they have written.
does anybody kknow of a way to do this?We used to do this with a hook into the keyboard driver--interupt chain--in assembler and C. You can also do it by peeking into the system event queue. In any case you are not going to do it with Java, but you can set up JNI to read from a dll you develop in Assembler/C to do what you want.
i know it can be done in visual basic using the
windows api. is there a way similar to this in java?
also is this even in the right forum? which one shoudl
this be posted in?
thanksYou probably should go over to the JNI forum or possibly the "I watch too many spy shows" forum.

Java terminating other programs

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