如何通过Install4j实现JRE捆绑包自动集成JCE？

Absolutely doable—let’s walk through exactly how to automate adding JCE components to your bundled JRE in Install4j, so your users get a fully pre-configured environment right out of the box:

First, gather all the JCE-related files you need (this could be unlimited-strength jurisdiction policy jars like local_policy.jar/US_export_policy.jar, or Bouncy Castle provider jars like bcprov-jdk15on.jar). Place them in a dedicated folder in your project’s resources (e.g., a jce-resources folder at your project root).

This step will automatically copy your JCE files into the bundled JRE’s security directory during installation:

• Open your Install4j project and navigate to Installer > Screens & Actions.
• Find the Installation phase (look for it after the "Welcome" screens and before "Finish" screens).
• Add a new Copy file(s) action (right-click the phase > Add Action > File Operations > Copy file(s)).
• Configure the action:
  • Source files: Point to your JCE resources folder, e.g., ${installer:sys.resourceDir}/jce-resources/* (the sys.resourceDir variable references your project’s resource directory).
  • Destination directory: Use the Install4j variable ${installer:sys.javaHome}/lib/security—this directly targets the security folder of the bundled JRE that gets installed on the user’s machine.
  • Check Overwrite existing files if you need to replace default JCE files (like the limited-strength policy jars).

If you’re using Bouncy Castle as a security provider, you’ll need to add it to the java.security file in the bundled JRE. Add a Replace in file action right after the copy step:

• Add the action via Add Action > File Operations > Replace in file.
• Set File path to ${installer:sys.javaHome}/lib/security/java.security.
• To append the Bouncy Castle provider to the list:
  • Use a search pattern like (security.provider.\d+=\S+)\s*$ (this matches the last existing provider line).
  • Use a replacement pattern like $1\nsecurity.provider.11=org.bouncycastle.jce.provider.BouncyCastleProvider—adjust the number (11 in this case) to be one higher than the last provider number in your JRE’s java.security file.
  • Alternatively, if you just want to append it to the end of the file, you can skip the search pattern and just add the new line directly in the replacement field (make sure to enable "Append to file" instead of replacing matches).

• Java Version Check: For Java 8u151 and later, unlimited-strength JCE is enabled by default—you won’t need to replace the policy jars. You’ll only need to add the Bouncy Castle provider if that’s your use case.
• Test Thoroughly: After setting up the actions, run a test install and verify:
  • Your JCE files are present in the installed JRE’s lib/security folder.
  • The java.security file has the correct provider entry (if you added it).
  • Your app can successfully use Bouncy Castle without manual configuration.

That’s it! Your installer will now handle all JCE setup automatically during installation, so your users can run app.exe immediately without any extra steps.

内容的提问来源于stack exchange，提问作者Maksym