Window Builder无法切换至设计视图，Java版本兼容问题如何解决？

Hey there, let's work through this Window Builder issue you're hitting. The error message spells it out clearly—your Eclipse instance is running on a Java version too old (the "version 0" is probably a quirky way of saying it's using a JRE older than 10) while your project is set to Java 10 compliance. That mismatch is why Window Builder can't load your project's classes. Here are two reliable fixes to get your design view working again:

This is the better long-term fix, since sticking to supported Java versions (like LTS releases such as 11 or 17) will prevent similar issues down the line.

• First, make sure you have Java 10 or later installed on your machine. Java 11 is a great LTS option if you don't have it already.
• Open Eclipse, then go to the top menu bar and click Window -> Preferences.
• In the preferences window, expand the Java folder and select Installed JREs.
• Click the Add button, choose Standard VM from the list, then hit Next.
• Click Directory and navigate to the installation path of your Java 10+ version (e.g., C:\Program Files\Java\jdk-11.0.20 on Windows), then confirm your selection.
• Back on the Installed JREs page, check the box next to the Java version you just added to set it as the default.
• Now, ensure Eclipse itself launches with this newer JRE: Locate the eclipse.ini file in your Eclipse installation directory, open it with a text editor like Notepad.
• Add these two lines before the -vmargs section (replace the path with your actual Java bin path):

  -vm
  C:\Program Files\Java\jdk-11.0.20\bin\javaw.exe
  

• Save the eclipse.ini file, restart Eclipse, then try switching to the design view again.

If you don't want to update your Eclipse's Java version right now, you can adjust your project's compliance level to match the JRE Eclipse is using.

• In Eclipse's Package Explorer, right-click your project and select Properties.
• In the properties window, select Java Compiler from the left sidebar.
• Uncheck the box that says Use compliance from execution environment '...' on the 'Java Build Path' (if it's checked).
• Use the dropdown menu for Compiler compliance level to select a version that matches the JRE Eclipse is running (e.g., Java 8 if that's what you were using before).
• Click Apply and Close to save the changes.
• To make sure everything syncs up, go to the top menu and click Project -> Clean, select your project, then hit Clean.
• Now try switching to the design view—it should load without the error.

A quick note: If you go with the second option, double-check that your project doesn't use any Java 10-specific features (like var type inference for local variables), otherwise you'll run into compilation errors.

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