{"record":{"id":"a4e37ceb5e6757cd","repo":"apache/hadoop","slug":"no-auth-handler-configured-for-scheme-scheme","errorCode":null,"errorMessage":"No auth handler configured for scheme ${scheme}","messagePattern":"No auth handler configured for scheme (.+?)","errorType":"exception","errorClass":"NullPointerException","httpStatus":null,"severity":"error","filePath":"hadoop-common-project/hadoop-auth/src/main/java/org/apache/hadoop/security/authentication/server/MultiSchemeAuthenticationHandler.java","lineNumber":131,"sourceCode":"    }\n\n    this.types.clear();\n    if (config.getProperty(SCHEMES_PROPERTY) == null) {\n      throw new NullPointerException(SCHEMES_PROPERTY + \" system property is not specified.\");\n    }\n    String schemesProperty = config.getProperty(SCHEMES_PROPERTY);\n    for (String scheme : STR_SPLITTER.split(schemesProperty)) {\n      scheme = AuthenticationHandlerUtil.checkAuthScheme(scheme);\n      if (schemeToAuthHandlerMapping.containsKey(scheme)) {\n        throw new IllegalArgumentException(\"Handler is already specified for \"\n            + scheme + \" authentication scheme.\");\n      }\n\n      String authHandlerPropName =\n          String.format(AUTH_HANDLER_PROPERTY, scheme).toLowerCase();\n      String authHandlerName = config.getProperty(authHandlerPropName);\n      if (authHandlerName == null) {\n        throw new NullPointerException(\n            \"No auth handler configured for scheme \" + scheme);\n      }\n\n      String authHandlerClassName =\n          AuthenticationHandlerUtil\n              .getAuthenticationHandlerClassName(authHandlerName);\n      AuthenticationHandler handler =\n          initializeAuthHandler(authHandlerClassName, config);\n      schemeToAuthHandlerMapping.put(scheme, handler);\n      types.add(handler.getType());\n    }\n    logger.info(\"Successfully initialized MultiSchemeAuthenticationHandler\");\n  }\n\n  protected AuthenticationHandler initializeAuthHandler(\n      String authHandlerClassName, Properties config) throws ServletException {\n    try {\n      if (authHandlerClassName == null) {","sourceCodeStart":113,"sourceCodeEnd":149,"githubUrl":"https://github.com/apache/hadoop/blob/2add9630210752f88ceb1bb74eb65e37bf41da8e/hadoop-common-project/hadoop-auth/src/main/java/org/apache/hadoop/security/authentication/server/MultiSchemeAuthenticationHandler.java#L113-L149","documentation":"Error \"No auth handler configured for scheme ${scheme}\" thrown in apache/hadoop.","triggerScenarios":"Raised at runtime when the documented precondition or configuration requirement for this operation is violated.","commonSituations":"Misconfigured or missing property, invalid user input, or calling the API before its prerequisites are met.","solutions":["Configure a handler for the requested scheme or request a scheme that is registered."],"exampleFix":"Add the scheme to multi-scheme-auth-handler.schemes and map a handler class to it.","handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"2add9630210752f88ceb1bb74eb65e37bf41da8e","analyzedAt":"2026-08-22T19:55:07.957Z","schemaVersion":2},"datasetVersion":"2026-08-23T01:17:44.959Z"}