Unity导出Android时提示找不到合适JDK（已装JDK10）如何解决？

Hey there, let's work through this JDK issue—this is a pretty common hiccup when setting up Unity for Android, so we'll get you sorted out. Here are the most likely fixes, ordered by how often they resolve the problem:

1. Manually point Unity to your JDK 10 installation #

Unity doesn't always auto-detect newer JDK versions correctly. Let's tell it exactly where to look:

• Open Unity, go to Edit > Preferences (Windows) or Unity > Settings (Mac).
• Navigate to the External Tools tab.
• Under the JDK section, click the browse button (the folder icon) and select the root directory of your JDK 10 installation.
  • For Windows, this is usually C:\Program Files\Java\jdk-10.x.x (replace x.x with your exact version number).
  • For Mac, it's typically /Library/Java/JavaVirtualMachines/jdk-10.jdk/Contents/Home.
• Click Apply and restart Unity to see if the error goes away.

2. Verify your JAVA_HOME environment variable #

Unity relies on the JAVA_HOME variable to locate the JDK. If it's missing or pointing to the wrong place, Unity will throw that error. Let's check and fix it:

On Windows: #

• Press Win + R, type sysdm.cpl and hit Enter.
• Go to the Advanced tab, then click Environment Variables.
• Under System Variables, check if there's a JAVA_HOME entry. If not, click New and set:
  • Variable name: JAVA_HOME
  • Variable value: The root path of your JDK 10 installation (e.g., C:\Program Files\Java\jdk-10.0.2)
• Also, make sure %JAVA_HOME%\bin is added to the Path variable (under System Variables). If not, edit Path and add that entry.
• Open a new Command Prompt and run java -version and javac -version—both should show JDK 10. If they do, restart Unity.

On Mac/Linux: #

• Open Terminal and run echo $JAVA_HOME—if it doesn't show your JDK 10 path, we need to set it.
• For a temporary fix (until you close Terminal), run:

  export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk-10.jdk/Contents/Home
  export PATH=$JAVA_HOME/bin:$PATH
  

• For a permanent fix, edit your shell config file (.bash_profile for Bash, .zshrc for Zsh) and add the lines above. Save the file, then run source ~/.bash_profile (or your config file) to apply changes.
• Run java -version and javac -version to confirm, then restart Unity.

3. Try JDK 8 instead (often the most reliable fix) #

While Unity says it supports JDK 8 or higher, some older Unity versions have compatibility issues with JDK 9+. JDK 8 is an LTS (Long-Term Support) version and is widely recommended for Android development with Unity. Here's what to do:

• Uninstall JDK 10 (optional, but avoids confusion) and download JDK 8 from Oracle's archive (or use OpenJDK 8).
• Repeat steps 1 and 2 to point Unity to JDK 8 and set JAVA_HOME accordingly.
• This almost always resolves the issue, especially if you're using a Unity version older than 2018.3 (which was the first version to add official support for JDK 9+).

4. Check your Unity version compatibility #

If you're dead-set on using JDK 10, make sure your Unity version supports it:

• Unity 2018.3 and newer officially support JDK 9 and 10.
• If you're on an older version (like 2018.2 or earlier), Unity won't recognize JDK 10 at all. Your options here are to either upgrade Unity to a newer version or downgrade to JDK 8.

5. Rule out permission issues (Windows-specific) #

Sometimes Unity can't access the JDK directory if it's running without sufficient permissions. Try:

• Right-click the Unity shortcut and select Run as administrator.
• If that works, you can set Unity to always run as admin by right-clicking the shortcut > Properties > Compatibility > Check "Run this program as an administrator".
• Alternatively, check the permissions on your JDK installation folder: Right-click the folder > Properties > Security > Ensure your user account has Read & Execute permissions.

Give these steps a try in order—most people fix the issue with step 1 or 3. Let me know if you run into any snags!

内容的提问来源于stack exchange，提问作者Pikamander2