{
  "id": "java/junit-extension-not-registered",
  "signature": "org.junit.jupiter.api.extension.ExtensionConfigurationException: Extension [com.example.MyExtension] is not registered",
  "signature_zh": "扩展配置异常：扩展 [com.example.MyExtension] 未注册",
  "regex": "org\\.junit\\.jupiter\\.api\\.extension\\.ExtensionConfigurationException:\\ Extension\\ \\[com\\.example\\.MyExtension\\]\\ is\\ not\\ registered",
  "domain": "java",
  "category": "config_error",
  "subcategory": null,
  "root_cause": "Custom JUnit extension is used via @ExtendWith but not properly registered or class not found.",
  "root_cause_type": "generic",
  "root_cause_zh": "通过 @ExtendWith 使用自定义 JUnit 扩展，但未正确注册或类未找到。",
  "versions": [
    {
      "version": "8+",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    }
  ],
  "os_specific": {},
  "dead_ends": [
    {
      "action": "Removing @ExtendWith annotation",
      "why_fails": "Extension functionality is lost; tests may fail.",
      "fail_rate": 0.6,
      "condition": "",
      "sources": []
    },
    {
      "action": "Adding extension as a dependency in build file",
      "why_fails": "Extension is already available; registration issue is different.",
      "fail_rate": 0.4,
      "condition": "",
      "sources": []
    }
  ],
  "workarounds": [
    {
      "action": "Register extension with @RegisterExtension",
      "success_rate": 0.9,
      "how": "@RegisterExtension\nstatic MyExtension extension = new MyExtension();",
      "condition": "",
      "sources": []
    },
    {
      "action": "Ensure extension class is public and has no-arg constructor",
      "success_rate": 0.85,
      "how": "public class MyExtension implements BeforeEachCallback {\n    public MyExtension() { }\n}",
      "condition": "",
      "sources": []
    }
  ],
  "workarounds_zh": [],
  "transition_graph": {
    "leads_to": [],
    "preceded_by": [],
    "frequently_confused_with": []
  },
  "official_doc_url": null,
  "official_doc_section": null,
  "error_code": null,
  "verification_tier": "ai_generated",
  "confidence": 0.84,
  "fix_success_rate": 0.8,
  "resolvable": "true",
  "first_seen": "2025-07-22",
  "last_confirmed": "2025-01-01",
  "last_updated": "2025-01-01",
  "evidence_count": 0,
  "tags": [],
  "locale": "en",
  "aliases": []
}