How to allow a Java application to run on any PC without installing jdk?

I'm doing this program that would retrieve infomation of the PC and send it to the server. In order to do that, i have to email the application to all these PCs. The problem is that some of these PCs may not have JRE or jdk to run the application. Cos, i thought that Java was Write once Run anywhere. I've tried to jar and run it on a PC with no JRE and stuff, How can this be done, I know that using applet is an option, but is there any other way. Pls help me, thanx!

you need a java virtual machine to run a java application, either it is embedded in the browser ( a native or plug-in ) and you can run your applet in the browser, or, if you don't want your app to be an applet, you have to install a jre on the PC...no other way, i'm afraid
so write once, run anywhere, provided there's a jre anywhere ! it is the jvm that handles differences between os, and you need to handle that difference somewhere, don't you !

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How to decomplie a java class file when java application is running/launch?

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Eg: Button b1 = new button();
now how to write a java application to decompile this class file & return me the button instance ie "b1".

I think you wanna do two different things:
1. find out which objects were created at runtime.
2. decompile class file.
I'm no so sure why.
have you tried insrospecting the class using reflection ?
Here is a code snippet that prints class field names.
try{
Class c = Class.forName("MyClass");
java.lang.reflect.Field[] f= c.getFields();
for (int i = 0;i<f.length; i++)
System.out.println(f.getName());
catch(Exception e){ }
Regards
Joseph.

How to make a Java application that will change the client box's IP address

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If you can do that through the command line, then use Runtime.getRuntime().exec(...) to execute your command.

How to ran a java application with out console?

Hi
I have developed several applications using java. I'm trying to run them on windows platform. The way I run them now is by openning a CMD window and by typing java -jar myjarfilename.jar
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HTH,
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How to schedule a java application via Windows Scheduler

I can't figure out how to schedule a java application using the Windows Scheduler. Do I schedule the java application with the .class file as a parameter? How do I pass arguments to it?
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Under the Task tab:
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TIA,
John

Suppose that your class is FileCopy (has no package name) and is located under MyDocuments\Eclipse_Workspace\Java_File_Copy folder, then you should have:
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Best way to do this is to create a special user (with password) for executing this task.
Regards

I have a program that requires Java 6. I am running 10.8.2, How do I remove Java 7 to run this program?

I have a program that requires Java 6. I am running 10.8.2, How do I remove Java 7 to run this program?

Try going to the Oracle site - they did have a page showing how to remove Java 7 using the terminal program.
I followed their instructions and it didn't work for me, but you may have better skills and luck than I.
This was my starign point;
http://www.java.com/en/download/help/mac_uninstall_java.xml
Let us know if this works.

How do i see what applications are running in the background

My iMac is running very slow my operating system is OS X Yosemite Version 10.10.2 with a 2.5 GHz Intel Core i5 Processor. How do I see what applications are running in the background?

Reinstalling OS X Without Erasing the Drive
Boot to the Recovery HD: Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
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Repair the Hard Drive and Permissions: Upon startup select Disk Utility from the main menu. Repair the Hard Drive and Permissions as follows.
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Note: You will need an active Internet connection. I suggest using Ethernet if possible because it is three times faster than wireless.
Alternatively, see:
Reinstall OS X Without Erasing the Drive
Choose the version you have installed now:
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OS X Mavericks- Reinstall OS X
OS X Mountain Lion- Reinstall OS X
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Note: You will need an active Internet connection. I suggest using Ethernet
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When trying to install Reader 9.2 updates it wants me to close applications that are using reader. There is nothing listed and no applications are running. Any ideas?

When trying to install Reader 9.2 updates it wants me to close applications that are using reader. There is nothing listed and no applications are running. Any ideas?

Make sure your browser is closed and check to see if there are any processes related to Acrobat still running. If you are using Windows, Control-Alt-Delete > Processes tab. Look for AcroRd32.exe or Acrobat.exe or Acrotray.exe and stop these processes from running before you try your update again. A good ol' computer reboot might do the trick for you too.

How to disable my java application after a few days

I have a java application as a MyApplication.jar file. On clicking this .jar my application starts. I want to distribute this jar to my friends so that they can run the application and use it. However, I want my application to run only for a few days. The jar should become unusable after say 10 days and no one (including the people holding the jar) should be able to execute it.

>
...I want to distribute this jar to my friends so that they can run the application and use it. However, I want my application to run only for a few days. >Just a wild guess. You don't have many friends*, do you?
In any case, the usual way to approach this task is to write a key to the system that contains the first date the software was run, then check it each subsequent launch. If the 'first date' + 'allowable days' is before 'today', pop a message telling the user that the software has expired.
As to how/where to store this information..
You might use the Properties class to read/write the date property.
Problems with this approach are
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b) Users finding and deleting the file containing the 'first date' property.
c) Users leaving the software running for 173 consecutive days.
d) * Users hating the software so much that they come and burn your house down.
( That last one is the real worry. ;)

How to launch my java application in a web browser?

Hi. I try to launch my java application, e.g. "HellowWorld.java", using web browser.
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I read "Java: An Introduction to Computer Science and Programming, Third Edition"
by Walter Savitch and found page 803 - "Converting a Swing application to an applet".
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2. I found "AWT only" tutorial had some example lauching application using "AppletButton".
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http://java.sun.com/docs/books/tutorial/information/download.html#OLDui
(after extracting zip file) -> ../OLDui/layout/card.html
3. (continued 2) Can I use above method to embed applet into web browser?
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I'd appreciate any partial anwers of these questions or other suggestions.
Thanks.

Thanks! Here is what I got from your help.
* HelloWorldSwing.java is a 1.4 example that
* requires no other files.
import javax.swing.*;
import java.awt.*;                //for Container class
// public class HelloWorldSwing {
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//    private static void createAndShowGUI() {
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//        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
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//        frame.pack();
//        frame.setVisible(true);
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/*    public static void main(String[] args) {
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}

How to deploy my Java application?

Have a proxy server running as a plain vanilla Java application from the DOS command line in Windows. Would like to run it 'properly' on a (web) server. Have got Apache and Tomcat installed but I don't know how to adapt my application to run in that environment. The proxy server maintains a socket connection from another backend machine and pushes information from there to a client that connects to the proxy server.

Well what's confusing is your use of "maintains", in "maintains a socket channel". That's largely counter to the design of the HTTP protocol. So I can't tell if you're using HTTP incorrectly or just describing it counter-intuitively.
If you're opening a socket from the client and keeping it open indefinitely to maintain a kind of session, then you're not really using HTTP right and you can just drop that.
If you really are using a series of HTTP connections, then Apache/Tomcat would be a fine thing.
If all you're doing is an ordinary proxy server, then actually Apache can handle that all by itself with no java code at all.
If your code is acting as a real HTTP server, then removing the web server parts, letting Apache handle that, and using Tomcat as a servlet environment would be very good. You'd be implementing only the business logic, not the standard plumbing stuff.
Have you ever written any servlets or other J2EE stuff?

How to deploy a java application -- might be silly but just help me out

Hi I�ve developed a java application in eclipse. How do I deploy it so that it can be used by others without the help of eclipse? I can run it in eclipse but how do I deliver it to my customers and how can they use it without the help of eclipse or using java runtime commands. Please give me some pointers on this.

Eclipse can help you to build a jar file for you.
See: File>Export ...>Java>Jar File
Don't forget to stick a Manifest file in that jar which points the JVM to
the class that contains the static main() method.
kind regards,
Jos

How to execute a java application once the server starts

I have created a java application which executes correctly. I want this application to execute everytime I start my server. I have modified my web.xml as shown below
<servlet>
<servlet-name>SendEmail</servlet-name>
<servlet-class>
com.allcorp.alliance.tdocs.servlets.SendEmail</servlet-class>
<init-param>
<param-name>config</param-name>
<param-value>/WEB-INF/struts-config.xml</param-value>
<load-on-startup>1</load-on-startup>
</init-param>
</servlet>
I have extended the class with HttpServlet. When I start the server, I get the message saying the class is being initializing but it does not execute. I want the application to execute. Any idea what I need to do.

BalusC wrote:
Implement ServletContextListener and run the appplication on creation of the ServletContext.Well i understand implementation of ServletContextListener and by overiding contextInitialized(ServletContextEvent se) accordingly can solve the problem.
but you need to consider two cases here first
1).ServletContextListener is not supported by all container especially the minor onces which does not support Servlet 2.3 specification.
2).OP does not have any idea of how to use a Servlet first if you can see he had written his intialization code in the main method.Now how can you expect him to create a listener..... :)
I hope there are no hard issues on what i said this time.
*@OP*
My friend the bad news is that you need to spend bit of time learning about servlets.U'd not be writing intialization code inside a main rather you'd be doing it inside public void init(ServletConfig config) method.
by making <load-on-startup><!--value</load-on-startup> in web.xml enables Servlet container to call init method at the time of deployment of the web application else where it'd call the init method whenever servlet encounters first request from a client.
package com.allcorp.alliance.tdocs.servlets;
import java.util.*;
import javax.mail.*;
import javax.mail.internet.*;
import javax.servlet.http.*;
import javax.servlet.*;
import javax.activation.*;
* @author ssa3z
* TODO To change the template for this generated type comment go to
* Window - Preferences - Java - Code Style - Code Templates
public class SendEmail extends HttpServlet{
public void init(ServletConfig config) {
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    String to = "[email protected]";
    String from = "[email protected]";
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props.put("mail.smtp.host", host);
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props.put("mail.debug", "true");
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try {
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}catch (MessagingException mex) {
    mex.printStackTrace();
} Hope this might help :)
REGARDS,
RaHuL

How to call a java application in a jar which is in a war file of a ear ?

So sorry to cross post, but no response in other topics.....
Please help!
I have a Ear file which contains a war file.
xx.ear/META-INF
xx.ear/YY.war
and the YY.war has the following structure:
YY.war/META-INF
YY.war/WEB-INF
YY.war/WEB-INF/classes
YY.war/WEB-INF/classes/com/
YY.war/WEB-INF/classes/com/mycompany/
YY.war/WEB-INF/classes/com/mycompany/MyClass.class
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how can I call this MyClass applicaiton from the xx.ear??
java -???? com.mycompany.MyClass ??
Please help because I have a Unix cron job need to access this class externally outside AppServer. Thx!!

an ear file is a standard jar with a different extension. You may
be able to get away with just adding a manifest file to it that
specifies the main class (make it an executable jar with a different
extension).
I don't know if this will handle the nested war file though. It may.
matfud

How to download IMExample java application??

Hi all,
I need to research Multimedia database in Oracle. I tried to find and to download IMExample Java application. but I don't know where I can find the IMExample in Oracle database.
Please, any one can help me where I can download IMExample Java application ???
Thanks alot !!

Hi
I have such problem
I must make database which store monkey's audio audio file (*.ape)
but Intermedia support only such file:
# This file controls what MIME types are sent to the client for the
# given file extensions. Sending the correct MIME type to the client
# is important so they know how to handle the content of the file.
# Extra types can either be added here or by using an AddType directive
# in your config files. For more information about MIME types
# please read RFC 2045, 2046, 2047, 2048, and 2077.
# MIME type               Extension
application/activemessage
application/andrew-inset
application/applefile
application/atomicmail
application/dca-rft
application/dec-dx
application/mac-binhex40     hqx
application/mac-compactpro     cpt
application/macwriteii
application/msword          doc
application/news-message-id
application/news-transmission
application/octet-stream     bin dms lha lzh exe class
application/oda               oda
application/pdf               pdf
application/postscript          ai eps ps
application/powerpoint          ppt
application/remote-printing
application/rtf               rtf
application/slate
application/smil          smi smil sml
application/wita
application/wordperfect5.1
application/x-bcpio          bcpio
application/x-cdlink          vcd
application/x-compress
application/x-cpio          cpio
application/x-csh          csh
application/x-director          dcr dir dxr
application/x-dvi          dvi
application/x-gtar          gtar
application/x-gzip
application/x-hdf          hdf
application/x-javascript     js
application/x-koan          skp skd skt skm
application/x-latex          latex
application/x-mif          mif
application/x-netcdf          nc cdf
application/x-sh          sh
application/x-shar          shar
application/x-stuffit          sit
application/x-sv4cpio          sv4cpio
application/x-sv4crc          sv4crc
application/x-tar          tar
application/x-tcl          tcl
application/x-tex          tex
application/x-texinfo          texinfo texi
application/x-troff          t tr roff
application/x-troff-man          man
application/x-troff-me          me
application/x-troff-ms          ms
application/x-ustar          ustar
application/x-vnd.realmedia rm
application/x-vnd.realtext rt
application/x-wais-source     src
application/zip               zip
audio/basic               au snd
audio/midi               mid midi kar
audio/x-mpeg               mpga mp2 mp3
audio/x-aiff               aif aiff aifc
audio/x-pn-realaudio          ram
audio/x-pn-realaudio-plugin     rpm
audio/x-realaudio          ra
audio/x-wav               wav
audio/x-ms-wma               wma
audio/x-ms-wax               wax
chemical/x-pdb               pdb xyz
image/bmp bmp
image/gif               gif
image/ief               ief
image/jpeg               jpeg jpg jpe
image/pict pict pct
image/png               png
image/tiff               tiff tif
image/x-cmu-raster          ras
image/x-portable-anymap          pnm
image/x-portable-bitmap          pbm
image/x-portable-graymap     pgm
image/x-portable-pixmap          ppm
image/x-rgb               rgb
image/x-xbitmap               xbm
image/x-xpixmap               xpm
image/x-xwindowdump          xwd
message/external-body
message/news
message/partial
message/rfc822
model/iges               igs iges
model/vrml               wrl vrml
model/mesh               msh mesh silo
multipart/alternative
multipart/appledouble
multipart/digest
multipart/mixed
multipart/parallel
text/css               css
text/html               html htm
text/plain               txt
text/richtext               rtx
text/tab-separated-values     tsv
text/x-setext               etx
text/x-sgml               sgml sgm
text/xml               xml dtd
video/mp4 mp4
video/3gpp 3gp
video/mpeg               mpeg mpg mpe
video/quicktime               qt mov
video/x-msvideo               avi
video/x-ms-asf               asf asx
video/x-ms-wmv               wmv
video/x-ms-wvx               wvx
video/x-sgi-movie          movie
x-conference/x-cooltalk          ice
There is no ape file, how can I add the new format *.ape
"Extra types can either be added here or by using an AddType directive" ??? how can I do it ?
Thanks

How to allow a Java application to run on any PC without installing jdk?

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