安装e(fx)clipse后创建JavaFX项目出现import javafx无法解析错误求助

Hey there, I've dealt with this exact issue before—JDK 12 no longer includes JavaFX SDK by default (Oracle removed it starting from JDK 11), which is the root cause of your import error. Let's walk through the fix step by step:

Step 1: Download the matching JavaFX SDK #

• Grab the JavaFX 12 SDK from the OpenJFX website (make sure the version matches your JDK 12 exactly, e.g., javafx-sdk-12.0.2)
• Extract the SDK to a local folder without spaces in the path, like C:\javafx-sdk-12

Step 2: Add JavaFX SDK to your project's build path #

• Right-click your JavaFX project in Eclipse → Build Path → Configure Build Path
• Switch to the Libraries tab, click Add Library → select JavaFX SDK → click Next
• Hit Directory and browse to the root folder of your extracted JavaFX SDK (the one containing lib, bin, etc.), then click Finish
• You should now see the JavaFX libraries listed under your project's build path

Step 3: Configure VM arguments for runtime #

Even if imports work now, you'll hit a runtime error without this step:

• Right-click your project → Run As → Run Configurations
• Select the Java Application entry for your main class, switch to the Arguments tab
• In the VM arguments field, paste this (replace the path with your actual SDK path):

  --module-path "C:\javafx-sdk-12\lib" --add-modules javafx.controls,javafx.fxml
  

  • Add extra modules like javafx.web or javafx.media if your project uses them

Step 4: (Optional) Set global JavaFX SDK in Eclipse preferences #

To avoid repeating this setup for future projects:

• Go to Window → Preferences → JavaFX
• Click Add to add your JavaFX SDK path, then set it as the default

Extra note for modular projects #

If your project uses a module-info.java file, make sure to declare dependencies on JavaFX modules:

module your.project.name {
    requires javafx.controls;
    requires javafx.fxml;
    // Add other modules as needed
    opens your.project.package to javafx.fxml;
}

内容的提问来源于stack exchange，提问作者rain1