How to Bundle a JRE with Launch4j for Standalone Java Applications?

Bundling a JRE with Launch4j

Launch4j offers a convenient feature for bundling a JRE within an executable file, but the documentation on this process is limited.

How to Bundle a JRE with Launch4j

1. Acquire a Compact JRE: Obtain a portable JRE for execution. Oracle's download links primarily offer installer packages, requiring an alternative approach.

2. Package as a Zip Archive: Create a zip file containing the following directory structure:

   • containerFolder

     • jre (Contains the copied JRE files: bin with java.exe, lib)
     • cfg (Optional for user configuration)
     • bin (Application files, including executable and JAR)

3. Configure Launch4j XML: Specify the JRE's path in the Launch4j XML file:

   <jre>
      <path>../jre</path>
      <opt>-DgvSIG.confDir=../cfg</opt>
   </jre>

Key Considerations:

• The path in the XML points to the JRE folder, not the java.exe file. It should be one level above java.exe in the directory structure.
• Utilize a pre-installed JRE from a Windows system to extract the necessary JRE files for bundling.

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