JDK Runtime in project settings always shows as jdk 21 while actual runtime isn't it

[yuyully]

Environment:

• VS Code Version: 1.101.2
• Extension Version: v0.29.2
• JDK Type & Version: jdk-24
• OS Type & Version: Windows

Step to Reproduce:

1. Open a java project
2. Open project settings > JDK Runtime

Expected Behavior:
JDK Runtime in project settings can show correctly without clean and restart.

Actual Behavior:
JDK Runtime in project settings always shows as jdk 21 while actual runtime isn't it. Clean workspace cache > Restart IDE > Then it can show correctly.

Related Issues:

[github-actions]

Hi Cindy Liu (@yuyully), I'm an AI Support assistant here to help with your issue. While the team reviews your request, I wanted to provide some possible tips and documentation that might help you in the meantime.

Solution

• Use the VS Code command “Java: Configure Java Runtime” to add your JDK 24 installation and mark it as default. This will update the list shown in Project Settings › JDK Runtime without needing to clear the cache.
• Alternatively, set your JDK explicitly in settings.json:

  "java.configuration.runtimes": [
    {
      "name": "JavaSE-24",
      "path": "C:\\Program Files\\Java\\jdk-24.0.1",  // adjust to your install folder
      "default": true
    }
  ]

  Then reload the window to apply.

Other references worth checking

• Java “var cannot be resolved to a type” – JDK 13.0
  Suggests using “Java: Configure Java Runtime” to verify and switch the active JDK
  Java "var cannot be resolved to a type" - JDK 13.0 #313 (comment)

• java.configuration.runtimes error The path points to a missing or inaccessible folder
  Shows how to declare your JDK runtime in settings.json and fix path issues
  java.configuration.runtimes error The path points to a missing or inaccessible folder in windows vscode-java-debug#1475

Other references with low confidence

• JAVA_HOME is not pointing to a JDK
  Describes checking JAVA_HOME/JDK_HOME environment variables if VS Code cannot locate a JDK
  JAVA_HOME is not pointing to a JDK. redhat-developer/vscode-java#1062

The team will respond to your issue shortly. I hope these suggestions are helpful in the meantime. If this comment helped you, please give it a 👍. If the suggestion was not helpful or incorrect, please give it a 👎. Your feedback helps us improve!