How to start a java application from a website

hey does anyone know how i can start my java application, when a user clicks a button on my website. I dont want to convert to applet because it will be quite hard plus im gonna have to cut down alot of functionalities? thanks!

[http://java.sun.com/javase/technologies/desktop/javawebstart/index.jsp]
Kaj

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How to open a java application from a web page?

Friends
I am in a situation to open a java application from a web page. I wrote a applet and placed a button on it. Onclicking of that button i con't open my java application. plz help me to open a userdefined application from web page.
Ramesh
e-Brahma technologies

http://java.sun.com/products/javawebstart/index.jsp

How to start a java application by double clicking just like windows gui?

Hi,
I want to open the user-defined file in my java application. The way is like the notepad in windows:1.double click the file name 2.the file is opened in the java application 3.if this file has opened at the same time ,then the last opened will be read-only.
Could you tell me how to carry it out ? Thank you
from Maria

!!! Please give me a help! i am thirsty for itSo, to get this straight, you have a Java application in a jar. For some reason, you do not execute this directly. Are you aware that you can execute a jar directly without the need to write a C++ exe to do it?
Anyway, for some reason, instead you have a C++ application which launches the JVM with your jar main class.
Well, you want to do two things. First of all, on Windows level, you need to associate the file type of your user file with your application. Note that they have to have a specific file extension that you choose. To associate the file type with an executable, you open a windows explorer, go to View, Folder Options, File Types and add an entry for your file type and specify it to open with your application. If you do not know how to do this, google for "windows associate file type with program executable" or something alike.
Now, if you double-click one of your user files, the associated exe will open, and it will receive the file name as a command line argument. In your C++ application, you will need to pass this argument, a file name, to the Java application where you launch it.

How to start a Java application

How do I start to a application?I have the SDK but where do I go to start it I cant seem to find it.
Thank you

Get a basic java programming book.
Maybe try something like JFrameBuilder which has a test version for free.
Available at
http://www.mars3000.com/
You will then be able to generate some code easly that you can look at and see some simple examples.
rykk

How to start a java application as windows 2000 service?

Hi all,
I'm trying to start / stop a java application as a windows 2000 service. But nothing appens (I can see the screen that rapidly display the java help prompt and then disappear)
I've a working directory i.e C:\MyDir and it contains instsrv.exe, srvany.exe and my application jar MyApp.jar
I'm using instsrv.exe to register a java application as a service ( C:\MyDir\instsrv MyApp C:\MyDir\srvany.exe )
I've added a key in registry by running regedit
The key is under the tree HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MyApp
the key value is Parameters
in the key I've added a string value "Application" with the value "C:\j2sdk1.4.2_01\bin\java.exe"
and a string value "AppParameters" with the value "-classpath C:\MyDir\MyApp.jar main" where main is the name of the main class application.
This seems to run correctly with Windows NT 4.0
But doesn't work with Windows 2000.
Can anyone help me?? pls.
Thanks.
Max

I'm replying to myself .... ;-) ahah
All we need for this purpose is JavaService, at link
http://www.alexandriasc.com/software/JavaService/index.html

How to start a Java application on Mac OS

Hello,
I am not sure whether this post would be appropriate to this community, but with the hope to find the answer to the question we have I'll try:
We are fairly new to Java Technology. We had the task to develop an application for Windows OS, and have successfully completed the job. BUT, we decided to go a bit further and see how our program would behave on Mac OS.
Unfortunately, we have never dealt with Macs before, thus don't have any idea on how to make the application run on Mac OS platform.
With Windows we have no problem, went by the most simple way by creating a .cmd file with "java name_of_file" string. Is there any similar simple way to start our small program on Mac OS?

There are many options:
From Terminal (similar to ms-dos prompt, if you didn't know it already):
If you have "java MyApp" in your myapp.cmd, you can execute it with:
sh myapp.cmd
Another option is to set myapp.cmd as executable:
chmod u+x myapp.cmd
and then from Terminal: ./myapp.cmd
Third and best option is to make an executable jar. Then you only have to double-click .jar -file to launch your application (and no need to go to Terminal).

How to execute a java application from java itself

Hi,
I�m working in Client Server environment. After starting the server, i want to automatically call the client. ( java Server (in Server.java
the call (java Client) has to be done. Can anyone help me for this problem.
thanks.

In normal client server design the client initiates communication with the server, not the other way around.
So you initiate a conversation just like a normal client server communication.
-The client is running.
-The client listens for a connection (SocketServer)
-The server starts up.
-It connects to the client using a socket. (The server must know the host/ip of the client.)

How to launch a java application from Microsoft SQL Server

Hi everyone
I noticed the following line in a trigger will launch an executable.
EXEC master..xp_cmdshell '"C:\Program Files\SkillSets.exe"', NO_OUTPUT
Does anyone know if this same statement will launch a java program? Or does anyone have any positive experience with that ?

yes...
check this basic example:
public class GoodWindowsExec{
public static void main(String args[]){
if (args.length < 1){
System.out.println("USAGE: java GoodWindowsExec <cmd>");
System.exit(1);
try{
String osName = System.getProperty("os.name" );
String[] cmd = new String[3];
if( osName.equals( "Windows NT" ) ){
cmd[0] = "cmd.exe" ;
cmd[1] = "/C" ;
cmd[2] = args[0];
}else if( osName.equals( "Windows 95" ) ){
cmd[0] = "command.com" ;
cmd[1] = "/C" ;
cmd[2] = args[0];
Runtime rt = Runtime.getRuntime();
System.out.println("Execing " + cmd[0] + " " + cmd[1]
+ " " + cmd[2]);
Process proc = rt.exec(cmd);
// any error message?
StreamGobbler errorGobbler = new
StreamGobbler(proc.getErrorStream(), "ERROR");
// any output?
StreamGobbler outputGobbler = new
StreamGobbler(proc.getInputStream(), "OUTPUT");
// kick them off
errorGobbler.start();
outputGobbler.start();
// any error???
int exitVal = proc.waitFor();
System.out.println("ExitValue: " + exitVal);
} catch (Throwable t)
t.printStackTrace();

How do I download an Application from my Website?

I need to be able to have visitors to my Website download an Application that I have authored.
With Mac it is easy - make a DMG for the App., put that file on the Website, do an HTML Href to the file:
<a href="download/tabwrite_demo.dmg">Download Now</a> </h2>
When the user clicks the Link, the DMG is downloaded.
Using the same methods, but for a Windows Installer:
<a href="download/setup.exe">Download Now</a> </h2>
doesn't seem to work.
The Windows Version and Installer were created on a Windows7 Computer, then I transferred the Installer File to my Mac.
I developed the Website on my Mac, with Dreamweaver, and use MAMP for testing, that is why I transferred the Installer to my Mac.
Can anyone shed some light on this subject?
I'm a bit slow at catching on, so I need a relatively simple, and complete explanation.
Thanks for any help - Myron Meyer

No prob. We often field other web related questions here .
Nancy O.

Call a Java Application from MicroFocus COBOL (in UNIX environment)

Hello,
Could you please let me know, how to call a Java application from a MicroFocus COBOL application. If anyone has any code samples, that would be of great help.
Thanks in advance,
Tijo.

You generally can't cause a program to be executed on a different >server. Basic security, you know. Besides this idea of having the Java >application run on a different server wasn't mentioned in your original >post. That leads me to believe we don't have the whole story.So I think you need to step back and find out what are the requirements. For example: Does your program need to start this Java application running, or is it already running and your program needs to connect to it somehow?
My program has to start a Java class file, meaning that the Micro Focus COBOL module will call the Java class file. Will it be running on the same machine as your program, or on some other machine?
For both cases, I would like to know the answer.a) Running on the same machine as my program is running.
b) Running on the different machine.
And then there are the questions about whether your program needs to have a conversation with the Java application, or whether it just needs to start it and that's all.
COBOL program has to call a Java class by passing some parameters and Java class in turn process it and return some value back.. Kind of Request and Response model.Plenty of questions to be asked. Go and find out what they are.
Sorry ... if I am not clear on my questions. Anyhow, thank you very much for providing the information.

Calling a Java Application from MicroFocus COBOL.... (in UNIX environment)

Hello,
Could you please let me know, how to call a Java application from a MicroFocus COBOL application. If anyone has any code samples, that would be of great help.
Thanks in advance,
Tijo.

Annoyingly crossposted.
http://forum.java.sun.com/thread.jspa?threadID=730657

Invoke one java application from another?

Hello,
Can anyone tell me how to Invoke one java application from another?
Suppose I have a small java application say, Hello.java which has its own main() method and
I also have another java application, say World.java which has its own main() method too.
What I want to do is invoke or startup World.java from Hello.java.
If possible kindly give code examples?

main is just a normal method so Hello can invoke the main method of World just as it would invoke any other method.
Kaj

How do I start and suspend Java Application from say C++ program

I want to start a Java application via C++ and on some condition i want to suspend the same program not terminate , but suspend

Have you tried running the virtual machine from your C++ application ? You can start Java applications from your C++ application using JNI after starting the Virtual machine from within your C++ application. According to the Java documentation you can even now stop the virtual machine from within your C++ program.
I haven't looked at the 'suspend' detail but I suppose it will not be a problem to call a method via JNI to set a flag to suspend a thread etc.
There is a tutorial: 'Invoking the Java Virtual Machine' at the following URL: http://java.sun.com/docs/books/tutorial/native1.1/invoking/invo.html.
This example seems to work only for version1.1 of the JDK. For JDK1.3, version 1.2, (I am not so sure whether I fully understand Sun's version numbers for Java yet) there is some updates on the JNI for starting the VM from C++. This article is called 'JNI Enhancements'. The URL for this article is:
http://java.sun.com/j2se/1.3.0/docs/guide/jni/jni-12.html
You have to set version to: JNI_VERSION_1_2
There is only one problem. I get an error when calling JNI_CreateJavaVM from C++. I could not find any documentation that indicates how you can go about diagnosing what is causing the problem. Normally in Visual C++ you can just get the probable cause by inspecting GetLastError() or the function itself can return helpful diagnostic (error) codes.
If you manage to start the VM correctly from within Visual C++ please let me know. My email address is [email protected]
good luck
Henko

Start a WS application from within a java program

Hi,
I need to start a WebStart application from within a java program. Therefore I develeoped a class which starts javaws.exe within its main-method like this:
try {
Runtime.getRuntime().exec(
"c:\\java web start\\javaws.exe http://a.b/c.jnlp"
} catch (Exception e) {
e.printStackTrace();
And that did not work. Java Web Start tries to start the .jnlp program but returns with the message, that the app-desc|applet-desc|installer-desc|component-desc is missing. But it is there: It is an applet and thus I defined an applet-dec.
I tried to do it from a command line with the followinf command:
java -Djnlpx.home="C:\abc" -cp "C:\abc\javaws.jar" com.sun.javaws.Main http://a.b/c.jnlp
And that works. But using this command from within my jjava prog using the Runtime.exec() method does not work.
By the way, simply type "javaws http://a.b/c.jnlp" at the command line does not work.
Can anybody help me? How may I start a .jnlp program within another java program.
Kind Regards,
Tobias Neubert

Hi,
I recently had a quite similar problem. At least the error message by the Java Web Start application on Mac OS X complained about the same error (app-desc|applet-desc|installer-desc|component-desc). It turned out to be some bad invisible characters in the jnlp file. I copied some sample from a web page which for some reason contained some unicode chars that the parser doesn't like. Use a different text editor or the less command on unix to see if there are some strange characters in you jnlp file.
But it seems strange that it does work from the command line and not from your code.
-Stefan

Start java application from java program

My problem is the following:
I start a java application A that allows you to select a couple of .java files.
After having choosen them, the application adds some additional information to these .java files (that means some more lines of code � we call it �infecting� the java files).
After the files have been infected, I want to start the application B implemented by these choosen and infected .java-files (without a new start of the Java Virtual Machine)
For doing so, we use the following method whichs works quite fine:
public static void ExecuteWithInvoke(String path, String classname)
     try
          new URLClassLoader(new URL[] {new File(path).toURL()})
               .loadClass(classname).getMethod("main",
               new Class[] { String[].class }).invoke(null,
               new Object[] { new String[] {} });
     catch (Exception e)
     {e.printStackTrace();}
The only problem that occurs:
When the application B is launched, the �old� version of the choosen .java files is used and not the current, already infected version of these files. (I guess because the �old� .class files are used.)
I solved this problem by finishing the program A after the infecting and restart my application B manually. In this case the infected .java files are used (I guess the new Start of the Java Virtual Machine solves my problem by reloading the �new� .class files)
How can I reach to start my application with the mentioned method but with the infected .java files and without having a new start of the JVM ??
Can anybody help me?
Thanks in advance
Sorry for my English, it�s a long time since I quit school

Hello,
my problem of reloading classes is still unsolved although you tried to help me!
Therefore I posted a little program to illustrate our difficulty.
It would be nice if somebody could have a look at this program.
We have a file Testdatei.java whose only method is the main method.
I get the class object of this file and with the help of Reflection the declared methods.
Evereything works fine so far.
Then I change the content of this file by adding an additional method a() (see change() for this).
Now I delete the old class file and I compile Testdatei.java again (see compileJava()) and once more I get the class object for this changed file. Afterwards I get the declared methods for this class via reflection.
But instead of showing now the methods main() and a() Reflection still only shows the method main().
I guess the changed class has not been reloaded!!
package testpackage;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.lang.reflect.Method;
import java.net.URL;
import java.net.URLClassLoader;
import com.sun.tools.javac.Main;
public class LoadClass
     private File f;
     private Class c = null;
     private Object o;
     public LoadClass()
          f = new File("C:/AAJ/src/testpackage/Testdatei.java");
          try
               o = neuesExemplar(f.getPath(), "testpackage.Testdatei");
               c = o.getClass();
               System.out.println("Class " + c.getName() + " found.");
          catch (Exception e)
          {e.printStackTrace();}
          Method [] method = c.getDeclaredMethods();
          for (int i=0; i<method.length; i++)
               System.out.println(method.getName());
          change();
          compileJava(f.getPath());
          File fileToDelete = new File("bin/testpackage/Testdatei.class");
          System.out.println(fileToDelete.delete());
          Class cla = null;
          try
               Object o = neuesExemplar(f.getPath(), "testpackage.Testdatei");
               cla = o.getClass();
               System.out.println("Class " + cla.getName() + " found.");
          catch (Exception e)
          {e.printStackTrace();}
          Method [] methods = cla.getDeclaredMethods();
          for (int i=0; i<methods.length; i++)
               System.out.println(methods[i].getName());
     private int compileJava(String javaFile)
     String[] args = {"-d", "C:/AAJ/bin/", "-classpath", System.getProperty("java.class.path"), javaFile};
     return Main.compile(args);
     public static void main(String[] args)
          new LoadClass();
     private Object neuesExemplar(String pfad, String klassename) throws Exception
     URL url = new File(pfad).toURL();
     URLClassLoader cl = new URLClassLoader( new URL[]{ url });
     Class c = cl.loadClass(klassename);
     return c.newInstance();
     private void change()
          FileWriter fw;
          BufferedWriter bw;
          try
               fw = new FileWriter(f);
               bw = new BufferedWriter(fw);
               bw.write("package testpackage;");
               bw.newLine();
               bw.newLine();
               bw.write("public class Testdatei");
               bw.newLine();
               bw.write("{");
               bw.newLine();
               bw.write("public static void main (String [] args)");
               bw.newLine();
               bw.write("{");
               bw.write("System.out.println(4);");
               bw.newLine();
               bw.write("}");
               bw.newLine();
               bw.newLine();
               bw.write("private void a ()");
               bw.newLine();
               bw.write("{");
               bw.newLine();
               bw.write("System.out.println(55);");
               bw.newLine();
               bw.write("}");
               bw.newLine();
               bw.write("}");
               bw.close();
               fw.close();
          catch (IOException e)
          {e.printStackTrace();}
I�m using eclipse 3.1.0. Is it possible that it�s a bug in eclipse that eclipse holds the old class file in memory from the beginning and always refers to this one and not to the new compiled one?
Thanks a lot
Simon

How to start a java application from a website

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