I'm new to java and have recently created a stress testing application to test server configurations. Its very simple and all is done within cmd line. I used eclipse to create the jar file and that seems to have worked fine.
The problem that I am running into is making this executable. If I use java -jar in windows cmd line to execute the program, it runs fine. However, I need to be able to run it by "double clicking" the jar file(right now I click on it and nothing happens) or create a .exe which defeats the purpose of java, but this will only be used in windows.
When I click on the jar now nothing happens, but when using the java - jar in cmd it works. Not all of the computers have java in the cmd line, but have it installed. I'm not sure why a cmd window doesnt pop when clicking on the jar?
Again I'm new and any help is much appreciated!!
Create a sortcut icon that will do java -jar yourFile.jar
In windows, you can associate the jar file with the JRE jar runner. Take a look at this post, which explains your options pretty well.
Make a bat file for Windows. You can do this by the following:
#echo off
java -jar YourJarName.jar
Save this in a text file with the .bat extension.
It should run the JAR once double clicked if the JAR file is in the same directory as the .bat file. Otherwise you will have to navigate to the JAR file relative to where the .bat file is located.
You said you didn't want an exe but not sure if this will be ok for you. It shouldn't be a problem for someone to click the .bat file first and will work in all cases under Windows.
Hope this helps.
If you want to get really awesome with it and have it show up in your Task Manager with an app.exe naming and handle any startup options, you should read into JNI. JNI will allow you to wrap the starting and stopping of a Java app using a windows executable and it is actually very simple to implement.
If you want something as simple as a windows exe launcher, there are also tools out there such as Launch4j will create exe wrappers for you.
Related
Is it possible to launch a cli java project by double click on the jar ?
Inside the jar, we have the manifest file with the main class well defined, but when we try to double click on jar it can't launch it and displays a generic error : The java jar file could not be launched.
We supposed that it's because it is only able to run this jar from the cli.
Is it right ?
PS : Sorry for my bad english, I'm french :)
Thanks !
Unless the jar-file includes some sort of implementation of Runtime that runs the system's terminal or command prompt, it won't open a terminal/prompt window when double clicking it (if some sort of GUI-implementation have been made with e.g. Swing, it will however launch the GUI). However, you can create a separate file, which will launch the jar-file.
As it seems you're on Mac, you can just create a .command-file. If you just need to execute your .jar-file, create a file with the following content:
#! /bin/bash
java -jar /path/to/file.jar
Name it something you remember, but don't forget to add .command at the end.
For Linux, use .sh extension, with the same content.
For Mac and Linux, you might have issues with executing the files because of lacking the permissions, see here for changing permissions on files.
For windows, use .bat extension. Exchange the slashes with backslashes when defining the path, and omit the #! /bin/bash-line. You'll also have to add Java to your environment variables, see here.
I am trying to run a very simple program by double clicking my Jar file with javaw.
It runs fine from Netbeans AND from the command line.
My registry path to javaw:
"C:\Program Files\Java\jre1.8.0_102\bin\javaw.exe" -jar "%1" %*
What is going wrong here? How can I make this work when I double click the Jar?
Make sure your JAR file is an executable JAR; I'm not entirely sure how to export an executable JAR from NetBeans (I use Eclipse), but this article seems to explain it pretty well.
Make sure javaw.exe is the default program for running JARs. This question addresses that.
There's also a Java Tutorial on making and using JARs, and several other StackOverflow questions about it.
I have a very basic .jar file that successfully runs, though I can only seem to run it by doing one of two things:
Using the command prompt and entering a command such as java -jar test.jar
Creating a shortcut with the path being java -jar C:\Users\Nick\Documents\test.jar
Is there a way to run a .jar file without having to do either of these two things, IE a way to run it from within Windows Explorer?
Edit:
My .jar file looks like this:
Manifest-Version: 1.0
Rsrc-Class-Path: ./
Class-Path: .
Rsrc-Main-Class: base.MainClass
Main-Class: org.eclipse.jdt.internal.jarinjarloader.JarRsrcLoader
I used Eclipse to create this. Should I edit the Main-Class to just be base.MainClass, and remove anything with Rsrc in it?
Double click on it
use something to wrap the JAR file into a common exe (e.g. http://launch4j.sourceforge.net/)
Note: When you double-click on a JAR and the JAR just prints out something on the console, the window could close immediately after the execution. In this case you won't see much. But your program was executed correctly and just the window was just closed after the execution. Try to open a JFrame in your application, then you should see the frame when you double-click on the JAR.
Make a .bat file in the distribution directory.
#echo off
start javaw -Dfile.encoding=UTF8 -jar test.jar
exit
This .bat file will also fix problems with special characters working in eg. netbeans, but not when double clicking the .jar
If you don't need support for special characters you can leave out the "-Dfile.encoding=UTF8" part.
My JARs are associated with 7Zip. To run an executable JAR, right click the file name and select Open With > Java.
Installing Java should create a shortcut for your OS, so that you can open executable jars by double click.
If it doesn't work for you, you have to investigate how to do it for your version of the OS.
I guess for Windows it is right-clicking on the app, and then configuring the "open with ..." dialog.
The program to run is afaik:
javaw -jar "%*"
where you have to specify the whole path to javaw, if it isn't in the PATH.
If the Java program expects command line arguments itself, for example a program to rotate an image might expect image files as arguments, so you can draw them with the mouse on the jarfile, therefore you specify the windows syntax for "all parameters" which is "%*" or something similar. The manual of your OS should answer the question.
I've created a program in java and now I want to create an executable from it.
I'm new to java, I don't know if it should be a .exe.
I'we exported my project to a .jar file, but when I double-click it it opens "open with" window.
I want to export my project to a file that runs my program on double-click.
Is there any solution?
Export --> Java --> Runnable Jar file --> Specify the class with static main method to run.
Double click on the Jar file to run..
Thanks...
Java compiliation creates byte code for the JVM, so a native, binary executable is not created during compiliation (like C or C++ programs). This is a feature of Java.
To deploy an application to multiple systems they must have the JRE. These .jar files can be launched from the command line (see this: http://download.oracle.com/javase/tutorial/deployment/jar/run.html)
Some vendors get around this with batch files that launch the JRE to run their application's JAR (and then put these in the start menu, desktop, etc with a fancy icon).
If you want people to install your app (especially from a web page or over a network) you probably want a Java Web Start package (see this for crating one in Eclipse: http://help.eclipse.org/indigo/index.jsp?topic=%2Forg.eclipse.platform.doc.isv%2Fguide%2Fjava_web_start.htm)
If you just want it to be runnable on your computer, you can use the open with dialog to open it with javaw.exe in JDK_DIRECTORY\bin. Alternatively, if you really wanted to make it an EXE, you could look at some of the answers here.
Either do as in the link mentioned by #dacwe or I would suggest to depending on operating system set a permanent connection between java and jars, then it will always happen.
On Windows you do it by right clicking on any jar then open with and find your javaw.exe in bin folder of your jre installation.
I think you are looking for a simpler approach than Java Web Start.
I assume that you are a Windows User, since you want a .exe file.
So once you have the exported MyProgram.jar file, you only need to create a .bat file
that contains a sole line:
java -jar MyProgram.jar
and place this execute.bat file in the same folder as your MyProgram.jar
This approach works for Linux too, only you need to place it inside a similar file and execute the same command.
Read here http://javabeanz.wordpress.com/2009/01/29/running-an-executable-jar-from-command-line/ for more explanations.
everyone, how can I create executable file for the program written on Java in Eclipse Helios? I mean to create small icon to be able start program only by double-clicking on its icon, thanks in advance
edited
I mean executable for Windows
Export .jar in eclipse. (how to)
Use JSmooth (info) to make an .exe file. (how to)
Here is a tutorial that shows you how to make a jar file from eclipse.
If Java is installed on the computer, you can execute your application by doubleclicking the jar file:
http://ecs.victoria.ac.nz/Courses/COMP205_2009T1/TutorialEclipseExportToJar
You didn't mention what platform you are using. There are 2 ways I can think of.
The easiest way is for you to create a *.bat file (in Windows) that contains the java YourApp command line.
If you want to create a more fancy installer and executable, you can use NSIS script to do so. Since you are using eclipse, consider trying EclipseNSIS to generate the NSIS script, which is much faster and easier than writing it yourself from ground up.
The best answer for this situation is to launch the app. using Java Web Start. JWS can not only create desktop and start menu launch items, but provides automatic updates, cross-platform compatibility and much more.
Create a 1-line metafile to specify which class the JVM should look for to start with the main(String[]) method.
Run the command jar cmf [metafileName] [jarfileName] [classfiles] [img/txtDirectories]
You have an executable jar file - type in "java -jar jarfileName" or, directly "jarfileName" at your prompt. On windows, you can also double click on the jar file logo/name to get it started.
Good wishes, - M.S.
PS: Here is the link to a more detailed tutorial:
http://csdl.ics.hawaii.edu/~johnson/613f99/modules/04/jar-files.html