java config_error ai_generated true

org.junit.jupiter.api.extension.ExtensionConfigurationException: Extension [com.example.MyExtension] is not registered

ID: java/junit-extension-not-registered

Also available as: JSON · Markdown · 中文
80%Fix Rate
84%Confidence
0Evidence
2025-07-22First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
8+ active — — —

Root Cause

Custom JUnit extension is used via @ExtendWith but not properly registered or class not found.

generic

中文

通过 @ExtendWith 使用自定义 JUnit 扩展，但未正确注册或类未找到。

Workarounds

  1. 90% success Register extension with @RegisterExtension 
    @RegisterExtension
static MyExtension extension = new MyExtension();
  2. 85% success Ensure extension class is public and has no-arg constructor 
    public class MyExtension implements BeforeEachCallback {
    public MyExtension() { }
}

Dead Ends

Common approaches that don't work:

  1. Removing @ExtendWith annotation 60% fail

    Extension functionality is lost; tests may fail.

  2. Adding extension as a dependency in build file 40% fail

    Extension is already available; registration issue is different.