How can I include a JRE in my EXE file using Launch4j?

Including a JRE with Launch4j

Question:

How can I incorporate a JRE into an EXE file using Launch4j? I'm also interested in finding a compact, portable JRE that can be used.

Answer:

To bundle a JRE with the EXE file, follow these steps:

1. Create a ZIP archive: Organize your application's files within a ZIP archive using the following folder structure:

   • containerFolder

     • jre

       • bin (containing java.exe)
       • lib
     • cfg (optional configuration folder)
     • bin (your application files)

2. Configure the Launch4j XML File:

   Configure the JRE section as follows:

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

   Note: The path property points to the folder containing the JRE, not directly to the java.exe file. The path should be relative to the EXE's location.

3. Obtain a Portable JRE:

   Create a portable JRE by copying the JRE folder from an installed Java system onto Windows. This will give you a compact, standalone JRE that can run your application.

By following these instructions, you can bundle a JRE with your application using Launch4j, allowing it to run on computers even if they don't have Java pre-installed.

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