File is open in java exe

JAR to EXE : Java program to Windows executable

Java is the best programming language available today that works across different platforms. I love Java and JavaFX. Once you finish writing your application, you may want to release it. The problem is, the native Java program executable, the good old .jar files always have a cup icon and sometimes a simple double click wont open them. The solution to this problem is to convert JARs to native executable, for windows .exe files.

In this article, I will explain how to make windows executable (.exe) from your Java / JavaFX program. Having exe file for windows has many advantages. We can set icons, properties, version information etc.

Step 1 : Make JAR file for your application

The first step is making a JAR file from your java code. This is pretty simple if you are using an IDE like NetBeans.

NetBeans : NetBeans provide option for making JAR file very easily. Just right click on your project from Projects window and then select “clean and build”. This will create a folder called “dist” in your project directory. Inside dist, there will be the final JAR. All the libraries required for running the program will be inside “/dist/lib” directory.

Maven : Maven uses convention over configuration, this means that you only need to tell Maven the things that are different from the defaults. You can use “mvn package” command to create JAR files.

Step 2 : Download Launch4J

Launch4J is so far the best wrapper available for converting JAR files to windows executable. It is written in JAVA and is open source. Download latest version of Launch4J from http://launch4j.sourceforge.net/. Once You install and open it, you will get the following screen.

On the first look, the interface may look little confusing, but it is actually simple and every field will become too important once you get used to it.

Step 3 : Launch4J Basic Configurations

This tab contains the most basic configurations for the exe like jar file to be converted and the icon to be used.

Basic

• Output File
  This is the location where the compiled EXE (executable) file will be created once the conversion is complete
• Jar
  Location of the Jar file to be converted in to executable
• Wrapper manifest
  You can specify manifest file here. This will be used for processing the application against User Account Control(UAC) in windows.
• Icon
  Here you can specify the icon. It has to be in ico format.
• Change dir
  Change current directory to an arbitrary path relative to the executable. If you omit this property or leave it blank it will have no effect. Setting it to . will change the current dir to the same directory as the executable. .. will change it to the parent directory, and so on.
• Command line args
  Here you can specify the java arguments

In case if the system doesn’t have supported Java, the error message and URL to download can be specifed under the Java Download and Support Sections.

Classpath

Here you can specify classpath for your main class. Select the JAR file by selecting the directory icon from right and the default classpath corresponding to main class will be loaded. You can edut them from Edit Item text field.
You can also add or remove classpath for given main class from this section.

Single Instance

Here you can specify whether you need only once instance of the application running at a time. Give a mutext name and window title if single instance option needed.

JRE

This section allows configuring JRE. If you are bundling JRE with your product (Which is not a good idea at all), you can specify the path here. You can check the ‘Fallback option’ so that the bundled JRE will only be used when the JRE isntalled on the system does not matches with min and max version requirement.

Min JRE Version is a mandatory field and it has to be specified.You can also specify Heap parameters or any JVM options in the corresponding fields.

Splash

If you need a custom splash screen, you can check the “Enable Splash Screen option”. Then specify the file (Either bitmap image or JAR file). In the TimeOut field, time out can be specified.

Version Info

This is a good way to properly specify version information for your executable. This entries will then be shown in the properties section of executable.

Messages

Messages section allows to create custom messages when errors occur. You can enable this option by checking “Add custom messages”.

Step 4 : Compile and Make Executable

Once the entries are filled, you have to save the configuration. For saving, click on the Floppy DIsk icon from the menu. Your configuration entries will be saved as an xml file called config.xml. After saving click on the Setting like icon next to save button to start converting to executable file.

If it the wrapping was a success, you should see the following messages in Log

Compiling resources Linking Wrapping Successfully created D:\Library Assistant\dist\Library Software.exe 

You can start your program from executable by clicking on the Play button from menu.

Watch video tutorial from Genuine Coder YouTube channel :-

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Make a Java File Executable

1. Make a Java File Executable using JAR Command
2. Make a Java File Executable using IDE
3. Make a Java File Executable using External Tools and Libraries

This tutorial introduces how to convert a Java program to an executable jar file in Java and also lists some example codes to understand the topic.

In Java, to create an executable JAR file, we can use several ways such as:

• jar command
• IDE (Eclipse, IntelliJ IDEA)
• Some tools like javapackager, WinRun4J, packr, JSmooth, JexePack, InstallAnywhere, Launch4j, etc.

Make a Java File Executable using JAR Command

We will start with a simpler method that requires just a single command that we need to run via a terminal. We will use compiled Java file, so make sure to compile the file first. Then, we will open the terminal, write the following command, and hit enter.

jar -cvf jarfile.jar MainJavaFile.class 

-cvf is a flag that represents copy , verbose , file , respectively.

jarfile.jar is the name of the JAR file that we want to create.

MainJavaFile is the main Java file that will be used as a source file.

After executing this command, it creates a JAR file that contains a menifest.mf file. It is a special file that contains information about the files packaged in a JAR file.

We need to open this and provide a main-class execution path, like:

Main-class: packageName.MainJavaFile 

Write this line to the file, save and quit, and execute this command to run the JAR file in the terminal.

It will run the Java code and display the output to the console or open a new window if the JAR file belongs to a graphical application such as swing or JavaFX.

Make a Java File Executable using IDE

We can use any IDE to create JAR file from a Java file. Here, we will use Eclipse IDE to create JAR. It includes the following steps.

Go to File menu and select Export

Select Runnable JAR file

Select Java file from Launch Configuration dropdown

Select Location to store the JAR, and

Execute the JAR

To create JAR using Elipse IDE, follow the above steps, and you will get the JAR.

Make a Java File Executable using External Tools and Libraries

WinRun4j is a java launcher for windows. It is an alternative to javaw.exe and provides several benefits. It uses an INI file for specifying classpath, main class, vm args, etc. It uses additional JVM args for more flexible memory use. We can use it to make a JAR runnable for Windows compatible.

It is a cross-platform tool for wrapping Java applications as JARs in lightweight Windows executables. It is possible to set runtime options, like the initial/max heap size.

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How to make an Executable File from your Java Code

Hello dear visitors, your most welcome in this domain(www.bittutech.com). Today, we are going to know about How to change/convert a Java Project/Program into an Executable file format? We have seen that mostly Java Project/Program contains two type of major files – (1) .java file and (2) .class file.

We would have studied Java in the first semester of Graduation in the Computer Science/Computer Application field. We would have made many programs and projects during that time, but probably, we wouldn’t have learned that How to convert a java project into a java archive file and convert the java archive file to an Executable file format.

Don’t bother from it, we will learn those things in this post and we will know that How to execute Java Program without JRE(Java Runtime environment).

First of all, we are going to know about JAR and EXE file format with brief introduction.

What is JAR File?

JAR file is also known as Java Archive file, which is used to encapsulate your java projects including package, classes, and objects with images and documentation in one file. JAR files work on distribute mechanisms to give our programs or projects to others.

It is a combination of heterogeneous files such as java source code, java class file, text file for documentation. we can contain various packages and classes in one JAR(java archive) file. it also helps to distribute our program to others in an easy way.

What is an Executable file (.exe)?

Executable files are those files which contain only machine language or combination of 0’s and 1’s binary digits. we can execute these files without any external environment or without the help of virtual CPUs. (.exe) the file is a type of Executable file that basically runs on Windows OS with the help of physical built-in CPUs.

Each and every program basically passes through three categories.

How to convert your java project into a .exe file?

Most often, we are using an Eclipse-based built-in java interpreter to run all Java projects either graphical projects or command-based projects. But if we want to do something different, and don’t want to use JRE(Java run-time environment) to execute our program without the help of JVM(java virtual machine), so we have to perform some basic work and after we can execute our java projects without the help of any downloaded virtual CPU. It means we have to convert our java projects into .exe file format.

Number of Steps to be needed to convert java projects into .exe file

There will follow multiple steps to convert our Java Projects into Executable file format(.exe). Before moving on towards, we have to know that What are the advantages of converting your java projects in .exe file?

• A .exe file doesn’t depend on virtual processors.
• A .exe file is a type of executable file for simply run on a Windows machine.
• A .exe file contains machine code and runs faster than others.
• A .exe file can run on another Windows PC without any external environment.
• A .exe file is also known as a binary file or non-human readable file.

Convert Java Programs/Projects into one .exe file

Finally, we are going to see that How to convert java projects into .exe file.

Step 1: Choose your Java Project from the Eclipse

You have to choose your project from Eclipse Java development Application and you have to follow several simple steps to firstly convert your java project into JAR file then you may be able to convert your JAR file into .exe file. Follow the below Screenshots.

First Step : Open Eclipse and Choose your Java project then Right Click on your project and select the Export Option.

Step 2: After select Export Option, select the Runnable Jar file option from the Next Window.

Step 3: Choose the Export Destination directory and file name.

Step 4: Click the Finish Button and check your Jar file is existing or not in your intended directory.

Step 5: Download launch4J application on your windows PC/Laptop to convert your JAR file into .exe format.

Step 6: After downloading the Application, double click on the downloaded exe file and install it on your PC/Laptop.

Step 7: Launch the Launch4J application after installing on your machine.

Step 8: Choose the Output file Location and give the Jar file location. you can also add file icon, but it is not necessary.

Step 9: After Basic Setting, you have to jump on the Jar tab for setting the minimum JRE version requirements.

Last Step: after completing the setting, you have to click on the Gear icon or Setting icon at the top of the below window.

So, now you can see your .exe file with/without icon. I use Google icon in place of by default exe icon. GUI_Project.exe is my Java project and i can run on any windows machine without the help of JVM or JRE.

Last words: That’s it for now. We will meet again with a new interesting article. Stay tuned with us. You can join us on social networks and get the latest update for newer post.

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