如何将自带j64目录JRE的应用打包为Install4j安装程序？

Absolutely! You can absolutely reuse your app's existing /j64 JRE directory instead of bundling a separate one with Install4j—this is a totally valid approach, and Install4j has straightforward tools to make it work. Let’s walk through the setup step by step:

Step 1: Add Your Built-in JRE to Install4j's Java Environments #

• Open your Install4j project and navigate to General Settings > Java Environments
• Click the "+" button to add a new Java environment, then select Directory as the type
• Browse to your project’s /j64 folder (make sure you select the root of the JRE, which should contain the bin and lib subdirectories)
• Give this JRE a descriptive name like "App Built-in JRE" and save the configuration

Step 2: Link the JRE to Your App's Launcher #

• Head to the Launchers page and find the launcher configuration for your app.exe
• Switch to the JRE tab, then use the "Java environment" dropdown to select the "App Built-in JRE" you just added
• To ensure Install4j only uses this JRE (and doesn’t look for system-wide Java), remove any other entries from the "Search sequence" list

Step 3: Ensure the /j64 Directory Gets Packaged #

• Go to the Files page and add your entire app directory structure (including /data, /docs, /j64, app.exe, etc.) to the installer’s target directory (usually ${installer:sys.installationDir})
• No special exclusions are needed for /j64—Install4j will package the whole directory, and the launcher will automatically point to it post-install

Quick Notes to Keep in Mind #

• Double-check that your /j64 JRE matches the target OS of your installer (e.g., Windows JRE for Windows installers, macOS JRE for macOS builds)
• You don’t need to modify app.exe manually—Install4j’s launcher will handle pointing to the correct JRE path automatically
• If you want the JRE to be private to your app (not shared with other programs), leave it as a Private JRE (the default setting), so it installs alongside your app in the target directory instead of a shared system location

内容的提问来源于stack exchange，提问作者Petr