{"record":{"id":"df19986c0a53452b","repo":"apache/hadoop","slug":"multi-scheme-auth-handler-schemes-system-property","errorCode":null,"errorMessage":"multi-scheme-auth-handler.schemes system property is not specified.","messagePattern":"multi-scheme-auth-handler\\.schemes system property is not specified\\.","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":117,"sourceCode":"   * handler.\n   *\n   * @return the token types supported by this authentication handler.\n   */\n  @Override\n  public Collection<String> getTokenTypes() {\n    return types;\n  }\n\n  @Override\n  public void init(Properties config) throws ServletException {\n    // Useful for debugging purpose.\n    for (Map.Entry prop : config.entrySet()) {\n      logger.info(\"{} : {}\", prop.getKey(), prop.getValue());\n    }\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 =","sourceCodeStart":99,"sourceCodeEnd":135,"githubUrl":"https://github.com/apache/hadoop/blob/2add9630210752f88ceb1bb74eb65e37bf41da8e/hadoop-common-project/hadoop-auth/src/main/java/org/apache/hadoop/security/authentication/server/MultiSchemeAuthenticationHandler.java#L99-L135","documentation":"Error \"multi-scheme-auth-handler.schemes system property is not specified.\" 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":["Set the multi-scheme-auth-handler.schemes system property listing the enabled authentication schemes."],"exampleFix":"java -Dmulti-scheme-auth-handler.schemes=kerberos,ldap ...","handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"2add9630210752f88ceb1bb74eb65e37bf41da8e","analyzedAt":"2026-08-22T19:55:07.957Z","schemaVersion":2},"datasetVersion":"2026-08-22T20:17:22.307Z"}