{"record":{"id":"d730bc72fec3e5f3","repo":"nats-io/nats-server","slug":"s-config-has-no-values-or-is-empty","errorCode":null,"errorMessage":"%s: config has no values or is empty","messagePattern":"(.+?): config has no values or is empty","errorType":"validation","errorClass":null,"httpStatus":null,"severity":"warning","filePath":"server/opts.go","lineNumber":1100,"sourceCode":"\tm, err := conf.ParseWithChecks(data)\n\tif err != nil {\n\t\treturn err\n\t}\n\n\treturn o.processConfigFile(_EMPTY_, m)\n}\n\n// ConfigDigest returns the digest representing the configuration.\nfunc (o *Options) ConfigDigest() string {\n\treturn o.configDigest\n}\n\nfunc (o *Options) processConfigFile(configFile string, m map[string]any) error {\n\t// Collect all errors and warnings and report them all together.\n\terrors := make([]error, 0)\n\twarnings := make([]error, 0)\n\tif len(m) == 0 {\n\t\twarnings = append(warnings, fmt.Errorf(\"%s: config has no values or is empty\", configFile))\n\t}\n\n\t// First check whether a system account has been defined,\n\t// as that is a condition for other features to be enabled.\n\tif err := configureSystemAccount(o, m); err != nil {\n\t\terrors = append(errors, err)\n\t}\n\n\tfor k, v := range m {\n\t\to.processConfigFileLine(k, v, &errors, &warnings)\n\t}\n\n\t// Post-process: check auth callout allowed accounts against configured accounts.\n\tif o.AuthCallout != nil {\n\t\taccounts := make(map[string]struct{})\n\t\tfor _, acc := range o.Accounts {\n\t\t\taccounts[acc.Name] = struct{}{}\n\t\t}","sourceCodeStart":1082,"sourceCodeEnd":1118,"githubUrl":"https://github.com/nats-io/nats-server/blob/3a66a489d262bf89b71a71c955c94920394532f3/server/opts.go#L1082-L1118","documentation":"A non-fatal warning emitted during Options.processConfigFile when the parsed configuration map is empty (len(m) == 0). The config file existed but contained no values, so the server proceeds with defaults while reporting this warning through processConfigErr.Warnings(). It is intentionally a warning, not an error, so startup is not blocked.","triggerScenarios":"Passing a config file path (-c) whose file is empty, contains only comments/whitespace, or parses to an empty map.","commonSituations":"A freshly created placeholder config; a file with only comments; the wrong file passed; a templating tool that rendered an empty file.","solutions":["Add at least one setting (e.g. port or listen) to the config file.","Verify the -c flag points to the intended file and that the file is non-empty on disk.","If defaults are intended, ignore the warning — the server continues with default options.","Check your config generation/templating pipeline for a rendering failure producing empty output."],"exampleFix":"// before (empty server.conf)\n# nothing here\n// after (server.conf)\nport: 4222\nlisten: 0.0.0.0:4222","handlingStrategy":"validation","validationCode":"// before passing -c to the server\ndata, err := os.ReadFile(configFile)\nif err != nil || len(bytes.TrimSpace(data)) == 0 {\n\treturn fmt.Errorf(\"config file %s is empty or unreadable\", configFile)\n}","typeGuard":null,"tryCatchPattern":null,"preventionTips":["Check config file size before startup in your service unit/scripts.","Ensure templating pipelines emit non-empty output.","Treat this warning in logs as a deploy-time signal."],"tags":["config","warning","empty-file"],"backgroundTag":"empty-config-file","analyzedSha":"3a66a489d262bf89b71a71c955c94920394532f3","analyzedAt":"2026-09-02T04:41:54.247Z","contentChangedAt":null,"schemaVersion":2},"datasetVersion":"2026-09-08T10:18:20.063Z"}