Runnable JAR进程正常运行但无法发送键盘日志邮件求助

Hey Jacob, sorry to hear your keylogger works perfectly in Eclipse but chokes on sending logs via email when packaged as a Runnable JAR. Let’s break down the most likely culprits and actionable steps to fix this:

1. First, Capture Error Messages (This Is Critical!) #

When you run the JAR directly from Command Prompt/Terminal using java -jar your-keylogger.jar, you’ll see any hidden exceptions or error messages that don’t show up in Task Manager. This is the fastest way to tell if the problem is with email logic, missing dependencies, or file access failures.

2. Make Sure Dependencies Are Packaged Properly #

Eclipse handles dependencies in its build path automatically, but Runnable JAR exports often miss key libraries (like JavaMail or other email-related jars):

• When exporting the JAR in Eclipse, select "Package required libraries into generated JAR" or "Extract required libraries into generated JAR" (avoid the option to copy libraries to a subfolder—this requires the subfolder to exist alongside the JAR every time you run it).
• If you use Maven/Gradle, double-check that your build config includes all dependencies in the final JAR artifact.

3. Fix Log File Path Discrepancies #

Relative file paths behave differently in Eclipse vs. a standalone JAR:

• If your keylogger writes logs to a relative path (like ./keylogs.txt), the JAR will look for this path in the directory where you launch the JAR, not Eclipse’s project folder.
• Fix this by using an absolute path, or dynamically get a reliable base path with:

  String logPath = System.getProperty("user.dir") + File.separator + "keylogs.txt";
  

• Alternatively, store logs in the system temp directory to avoid permission headaches:

  String logPath = System.getProperty("java.io.tmpdir") + "keylogs.txt";
  

4. Check Email Configuration & Environment Differences #

Eclipse might have network settings, proxies, or environment variables that the standalone JAR doesn’t inherit:

• Ensure SMTP credentials (username/password) are hardcoded correctly, or that any external config files are in the right location relative to the JAR.
• Verify SMTP server settings (port, SSL/TLS status) match what works in Eclipse. Some networks block outgoing SMTP traffic for standalone apps—test sending a simple email from the same machine using the same credentials outside of Eclipse to rule this out.

5. Rule Out Permission Issues #

The user running the JAR might lack permissions that Eclipse had:

• If you’re writing logs to a restricted folder (like C:\Program Files or /usr/bin), the JAR might fail to create/write the log file. Use a more accessible folder like the user’s home directory: System.getProperty("user.home").
• On Windows, try running the JAR as Administrator to eliminate permission blocks for network or file access.

6. Confirm Java Version Compatibility #

Eclipse might compile against a different Java version than what’s used to run the JAR:

• Run java -version in the terminal to check the runtime version. Compare this to Eclipse’s Project Properties > Java Build Path > Libraries (check the JRE System Library version).
• If there’s a mismatch, recompile the project with the same version as the runtime, or adjust the JAR’s runtime environment.

7. Double-Check the Exported Main Class #

It’s easy to accidentally select a helper class instead of the main class that starts the keylogger and email logic when exporting the Runnable JAR. Reopen the export wizard in Eclipse and confirm you’ve picked the correct class with the main() method.

Start with running the JAR from the command line to get error details—this will narrow down the problem way faster than guessing. Let us know what error messages you see, and we can dig deeper!

内容的提问来源于stack exchange，提问作者serek22