How to Bundle a JRE with Launch4j and Where to Find a Portable JRE?

Bundling a JRE with Launch4j

Question:

How can I integrate a JRE into a bundled EXE using Launch4j? Additionally, where can I find a portable and compact JRE for execution?

Answer:

To successfully bundle a JRE within your application's EXE file using Launch4j, follow these steps:

1. Package your application: Create a zip file containing the following folders:

   • containerFolder
   • jre (containing bin and lib folders with java.exe)
   • cfg (optional, for user configuration)
   • bin (containing your application's EXE, JAR, and other components)

2. Configure Launch4j's XML file: Specify the JRE's location using the following syntax:

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

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Key Point:

The path provided in the XML file is not to the java.exe file itself, but rather to the parent folder of java.exe. This allows Launch4j to properly locate and access the JRE during application execution.

Note:

The JRE used in this solution is obtained by extracting the JRE folder from an existing Windows installation. This ensures you have a JRE that is both portable and compatible with your application.

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