[Bug]: data-source-files report Unhandled exception. System.AggregateException: One or more errors occurred. (Object reference not set to an instance of an object.)

[crushonme]

What happened?

When I use data-source-files to reference two configuration file, it report Unhandled exception. System.AggregateException: One or more errors occurred. (Object reference not set to an instance of an object.)

top level configuration file is as below. I have used "dab validate" command to validate these two child configuration and there is no error. And I have confirmed that Entity names are unique across all configuration files.

{
  "$schema": "https://github.com/Azure/data-api-builder/releases/download/v1.2.14/dab.draft.schema.json",
  "data-source-files":[
    "dab-config-local.json", 
    "dab-config-azsqldb.json"
  ],
  "runtime": {
    "rest": {
      "enabled": true,
      "path": "/api",
      "request-body-strict": true
    },
    "graphql": {
      "enabled": true,
      "path": "/graphql",
      "allow-introspection": true
    },
    "host": {
      "cors": {
        "origins": [],
        "allow-credentials": false
      },
      "authentication": {
        "provider": "StaticWebApps"
      },
      "mode": "development"
    }
  }
}

Full error log

dab validate -c dab-config-multi.json
Information: Microsoft.DataApiBuilder 1.2.14
Information: User provided config file: dab-config-multi.json
Information: Validating config file: dab-config-multi.json
Loading config file from dab-config-multi.json.
Unhandled exception. System.AggregateException: One or more errors occurred. (Object reference not set to an instance of an object.)
 ---> System.NullReferenceException: Object reference not set to an instance of an object.
   at Azure.DataApiBuilder.Config.ObjectModel.RuntimeConfig..ctor(String Schema, DataSource DataSource, RuntimeEntities Entities, RuntimeOptions Runtime, DataSourceFiles DataSourceFiles) in /_/src/Config/ObjectModel/RuntimeConfig.cs:line 195
   at .ctor(Object[])
   at System.Text.Json.Serialization.Converters.LargeObjectWithParameterizedConstructorConverter`1.CreateObject(ReadStackFrame& frame)
   at System.Text.Json.Serialization.Converters.ObjectWithParameterizedConstructorConverter`1.OnTryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value)
   at System.Text.Json.Serialization.JsonConverter`1.TryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value, Boolean& isPopulatedValue)
   at System.Text.Json.Serialization.JsonConverter`1.ReadCore(Utf8JsonReader& reader, JsonSerializerOptions options, ReadStack& state)
   at System.Text.Json.JsonSerializer.ReadFromSpan[TValue](ReadOnlySpan`1 utf8Json, JsonTypeInfo`1 jsonTypeInfo, Nullable`1 actualByteCount)
   at System.Text.Json.JsonSerializer.ReadFromSpan[TValue](ReadOnlySpan`1 json, JsonTypeInfo`1 jsonTypeInfo)
   at System.Text.Json.JsonSerializer.Deserialize[TValue](String json, JsonSerializerOptions options)
   at Azure.DataApiBuilder.Config.RuntimeConfigLoader.TryParseConfig(String json, RuntimeConfig& config, ILogger logger, String connectionString, Boolean replaceEnvVar, String dataSourceName, Dictionary`2 datasourceNameToConnectionString, EnvironmentVariableReplacementFailureMode replacementFailureMode) in /_/src/Config/RuntimeConfigLoader.cs:line 73
   at Azure.DataApiBuilder.Config.FileSystemRuntimeConfigLoader.TryLoadConfig(String path, RuntimeConfig& config, Boolean replaceEnvVar, String dataSourceName) in /_/src/Config/FileSystemRuntimeConfigLoader.cs:line 108
   at Azure.DataApiBuilder.Config.FileSystemRuntimeConfigLoader.TryLoadKnownConfig(RuntimeConfig& config, Boolean replaceEnvVar, String dataSourceName) in /_/src/Config/FileSystemRuntimeConfigLoader.cs:line 145
   at Azure.DataApiBuilder.Core.Configurations.RuntimeConfigProvider.TryGetConfig(RuntimeConfig& runtimeConfig) in /_/src/Core/Configurations/RuntimeConfigProvider.cs:line 125
   at Azure.DataApiBuilder.Core.Configurations.RuntimeConfigValidator.TryValidateConfig(String configFilePath, ILoggerFactory loggerFactory) in /_/src/Core/Configurations/RuntimeConfigValidator.cs:line 155
   --- End of inner exception stack trace ---
   at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
   at System.Threading.Tasks.Task`1.GetResultCore(Boolean waitCompletionNotification)
   at Cli.ConfigGenerator.IsConfigValid(ValidateOptions options, FileSystemRuntimeConfigLoader loader, IFileSystem fileSystem) in /_/src/Cli/ConfigGenerator.cs:line 1199
   at Cli.Commands.ValidateOptions.Handler(ILogger logger, FileSystemRuntimeConfigLoader loader, IFileSystem fileSystem) in /_/src/Cli/Commands/ValidateOptions.cs:line 31
   at Cli.Program.<>c__DisplayClass2_0.<Execute>b__5(ValidateOptions options) in /_/src/Cli/Program.cs:line 67
   at CommandLine.ParserResultExtensions.MapResult[T1,T2,T3,T4,T5,T6,T7,T8,TResult](ParserResult`1 result, Func`2 parsedFunc1, Func`2 parsedFunc2, Func`2 parsedFunc3, Func`2 parsedFunc4, Func`2 parsedFunc5, Func`2 parsedFunc6, Func`2 parsedFunc7, Func`2 parsedFunc8, Func`2 notParsedFunc)
   at Cli.Program.Execute(String[] args, ILogger cliLogger, IFileSystem fileSystem, FileSystemRuntimeConfigLoader loader) in /_/src/Cli/Program.cs:line 61
   at Cli.Program.Main(String[] args) in /_/src/Cli/Program.cs:line 41

Version

1.2.14+c7ca8db8558a63919c530e454c8f18b45d5b931c

What database are you using?

Azure SQL

What hosting model are you using?

Local (including CLI)

Which API approach are you accessing DAB through?

GraphQL, REST

Relevant log output

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