How to Convert a JAR to an EXE for Cross-Platform Compatibility?

Converting a JAR to an EXE: A Comprehensive Guide for Windows, MacOS, and Linux

Introduction

JAR (Java Archive) and EXE (Executable) files represent different file formats for executable programs, with JAR being specifically for Java-based applications. Converting a JAR to an EXE becomes necessary when you want to make a Java program directly runnable on Windows systems without requiring the Java Runtime Environment (JRE).

Windows Conversion Using Launch4j

For Windows users, Launch4j is a popular tool that converts JAR files into EXE files. It offers various customization options, including icon setting, auto-updates, and splash screens. The program is compatible with both Windows and Linux/Mac.

Linux/Mac Conversion Using Launch4j

While Launch4j is compatible with Linux/Mac, there is an alternative method using shell scripts to embed the JAR file and automate its execution. By following these steps:

1. Create a shell script named "exestub.sh" with the provided code.
2. Modify the JAVA_OPT and PROG_OPT settings to adjust Java and program options.
3. Combine the exestub.sh script with your JAR file using the command:

$ cat exestub.sh myrunnablejar.jar > myrunnable

4. Make the "myrunnable" file executable:

$ chmod +x myrunnable

This method allows you to have a single runnable file that behaves similarly to an EXE file created by Launch4j.

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