{"record":{"id":"ef7a547458024ead","repo":"grpc/grpc-go","slug":"failed-to-build-call-credentials-from-bootstrap-fo","errorCode":null,"errorMessage":"failed to build call credentials from bootstrap for %q: %v","messagePattern":"failed to build call credentials from bootstrap for %q: (.+?)","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"internal/xds/bootstrap/bootstrap.go","lineNumber":391,"sourceCode":"\t\t\tsc.extraDialOptions = d.DialOptions()\n\t\t}\n\t\tsc.cleanups = append(sc.cleanups, cancel)\n\t\tbreak\n\t}\n\n\tif envconfig.XDSBootstrapCallCredsEnabled {\n\t\t// Process call credentials - unlike channel creds, we use ALL supported\n\t\t// types. Also, call credentials are optional as per gRFC A97.\n\t\tfor _, cfg := range server.CallCredsConfigs {\n\t\t\tc := bootstrap.GetCallCredentials(cfg.Type)\n\t\t\tif c == nil {\n\t\t\t\t// Skip unsupported call credential types (don't fail bootstrap).\n\t\t\t\tcontinue\n\t\t\t}\n\t\t\tcallCreds, cancel, err := c.Build(cfg.Config)\n\t\t\tif err != nil {\n\t\t\t\t// Call credential validation failed - this should fail bootstrap.\n\t\t\t\treturn fmt.Errorf(\"failed to build call credentials from bootstrap for %q: %v\", cfg.Type, err)\n\t\t\t}\n\t\t\tsc.selectedCallCreds = append(sc.selectedCallCreds, callCreds)\n\t\t\tsc.extraDialOptions = append(sc.extraDialOptions, grpc.WithPerRPCCredentials(callCreds))\n\t\t\tsc.cleanups = append(sc.cleanups, cancel)\n\t\t}\n\t}\n\n\tif sc.serverURI == \"\" {\n\t\treturn fmt.Errorf(\"xds: `server_uri` field in server config cannot be empty: %s\", string(data))\n\t}\n\tif sc.credsDialOption == nil {\n\t\treturn fmt.Errorf(\"xds: `channel_creds` field in server config cannot be empty: %s\", string(data))\n\t}\n\treturn nil\n}\n\n// ServerConfigTestingOptions specifies options for creating a new ServerConfig\n// for testing purposes.","sourceCodeStart":373,"sourceCodeEnd":409,"githubUrl":"https://github.com/grpc/grpc-go/blob/0c51461d27177d997e14c642fe18c11668fc09a3/internal/xds/bootstrap/bootstrap.go#L373-L409","documentation":"Returned when a call credentials plugin's Build() fails while parsing a bootstrap server config. This path only runs when the GRPC_XDS_BOOTSTRAP_CALL_CREDENTIALS feature flag (envconfig.XDSBootstrapCallCredsEnabled) is on. The credential type name is printed along with the underlying error.","triggerScenarios":"Triggered at bootstrap.go:391 when c.Build(cfg.Config) errors for a registered call credentials plugin. Example: the jwtcreds plugin fails because the JWT token file path is invalid or empty.","commonSituations":"Feature flag enabled but call_creds config is incomplete; jwt_token_file path missing/unreadable; call creds plugin name typo causing Build to receive wrong config shape.","solutions":["Confirm whether you intend to enable xDS call credentials (env var GRPC_XDS_BOOTSTRAP_CALL_CREDENTIALS); if not, unset it.","Inspect the underlying %v to see which call creds plugin and which constraint failed.","For jwtcreds: ensure jwt_token_file points to a readable, valid JWT file.","Validate the call_creds config block matches gRFC A97."],"exampleFix":"// before: call creds enabled but jwt_token_file invalid\n\"call_creds\":[{\"type\":\"jwt\",\"config\":{\"jwt_token_file\":\"\"}}]\n\n// after\n\"call_creds\":[{\"type\":\"jwt\",\"config\":{\"jwt_token_file\":\"/var/secrets/token.jwt\"}}]","handlingStrategy":"validation","validationCode":"// Only enable xDS call credentials when config is complete.\nfunc callCredsReady(entries []callCredsEntry) bool {\n    if !osvHasFlag(\"GRPC_XDS_BOOTSTRAP_CALL_CREDENTIALS\") {\n        return true // feature off, error cannot fire\n    }\n    for _, e := range entries {\n        if e.Type == \"jwt\" && e.JWTTokenFile == \"\" {\n            return false\n        }\n    }\n    return true\n}","typeGuard":null,"tryCatchPattern":"if _, err := bootstrap.NewConfigFromContents(data); err != nil {\n    if strings.Contains(err.Error(), \"failed to build call credentials\") {\n        // either fix the call_creds config or unset the call-creds feature flag.\n    }\n}","preventionTips":["Only set GRPC_XDS_BOOTSTRAP_CALL_CREDENTIALS when the call_creds config is fully populated.","Validate JWT token files at deploy time.","Document which env vars gate this code path."],"tags":["grpc","xds","bootstrap","credentials","jwt","call-credentials","go"],"backgroundTag":null,"analyzedSha":"0c51461d27177d997e14c642fe18c11668fc09a3","analyzedAt":"2026-08-11T14:49:15.055Z","contentChangedAt":null,"schemaVersion":2},"datasetVersion":"2026-09-23T08:17:48.524Z"}