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Bug: sam local invoke on dotnet minimal api throws NullReferenceException in runtime container
Description:
We have a dotnet minimal api demo.
sam deploy works, which could be invoked from AWS cloud.
sam local start-api also works.
However, sam local invoke would throw an error.
Steps to reproduce:
- Clone repo - https://github.com/sravimohan/Dotnet6MinApiLambdaSample
- Run
sam build - Run
sam invoke local
Observed result:
sam local invoke output:
{
"errorType": "NullReferenceException",
"errorMessage": "Object reference not set to an instance of an object.",
"stackTrace": [
"at Amazon.Lambda.AspNetCoreServer.APIGatewayHttpApiV2ProxyFunction.MarshallRequest(InvokeFeatures features, APIGatewayHttpApiV2ProxyRequest apiGatewayRequest, ILambdaContext lambdaContext)",
"at Amazon.Lambda.AspNetCoreServer.AbstractAspNetCoreFunction`2.FunctionHandlerAsync(TREQUEST request, ILambdaContext lambdaContext)",
"at Amazon.Lambda.RuntimeSupport.HandlerWrapper.<>c__DisplayClass26_0`2.<<GetHandlerWrapper>b__0>d.MoveNext()",
"--- End of stack trace from previous location ---",
"at Amazon.Lambda.RuntimeSupport.LambdaBootstrap.InvokeOnceAsync(CancellationToken cancellationToken)"
]
}
sam local invoke --debug output:
2025-02-07 22:51:32,997 | Config file location: /Users/menglinmaker/Downloads/Dotnet6MinApiLambdaSample-main/samconfig.toml
2025-02-07 22:51:32,998 | Loading configuration values from [default.['local', 'invoke'].parameters]
(env.command_name.section) in config file at '/Users/menglinmaker/Downloads/Dotnet6MinApiLambdaSample-main/samconfig.toml'...
2025-02-07 22:51:32,999 | Configuration values successfully loaded.
2025-02-07 22:51:32,999 | Configuration values are: {}
2025-02-07 22:51:33,001 | Using SAM Template at
/Users/menglinmaker/Downloads/Dotnet6MinApiLambdaSample-main/.aws-sam/build/template.yaml
2025-02-07 22:51:33,017 | Using config file: samconfig.toml, config environment: default
2025-02-07 22:51:33,018 | Expand command line arguments to:
2025-02-07 22:51:33,018 |
--template_file=/Users/menglinmaker/Downloads/Dotnet6MinApiLambdaSample-main/.aws-sam/build/template.yaml --no_event
--layer_cache_basedir=/Users/menglinmaker/.aws-sam/layers-pkg --container_host=localhost --container_host_interface=127.0.0.1
2025-02-07 22:51:33,019 | local invoke command is called
2025-02-07 22:51:34,480 | No Parameters detected in the template
2025-02-07 22:51:34,499 | Sam customer defined id is more priority than other IDs. Customer defined id for resource
Dotnet6MinApiLambda is Dotnet6MinApiLambda
2025-02-07 22:51:34,499 | There is no customer defined id or cdk path defined for resource ServerlessHttpApi, so we will use
the resource logical id as the resource id
2025-02-07 22:51:34,500 | 0 stacks found in the template
2025-02-07 22:51:34,500 | No Parameters detected in the template
2025-02-07 22:51:34,512 | Sam customer defined id is more priority than other IDs. Customer defined id for resource
Dotnet6MinApiLambda is Dotnet6MinApiLambda
2025-02-07 22:51:34,512 | There is no customer defined id or cdk path defined for resource ServerlessHttpApi, so we will use
the resource logical id as the resource id
2025-02-07 22:51:34,513 | 2 resources found in the stack
2025-02-07 22:51:34,513 | Found Serverless function with name='Dotnet6MinApiLambda' and CodeUri='Dotnet6MinApiLambda'
2025-02-07 22:51:34,514 | --base-dir is not presented, adjusting uri Dotnet6MinApiLambda relative to
/Users/menglinmaker/Downloads/Dotnet6MinApiLambdaSample-main/.aws-sam/build/template.yaml
2025-02-07 22:51:34,522 | Found one Lambda function with name 'Dotnet6MinApiLambda'
2025-02-07 22:51:34,522 | Invoking Dotnet6MinApiLambdaSample (dotnet8)
2025-02-07 22:51:34,523 | No environment variables found for function 'Dotnet6MinApiLambda'
2025-02-07 22:51:34,523 | Loading AWS credentials from session with profile 'None'
2025-02-07 22:51:34,529 | Resolving code path.
Cwd=/Users/menglinmaker/Downloads/Dotnet6MinApiLambdaSample-main/.aws-sam/build,
CodeUri=/Users/menglinmaker/Downloads/Dotnet6MinApiLambdaSample-main/.aws-sam/build/Dotnet6MinApiLambda
2025-02-07 22:51:34,529 | Resolved absolute path to code is
/Users/menglinmaker/Downloads/Dotnet6MinApiLambdaSample-main/.aws-sam/build/Dotnet6MinApiLambda
2025-02-07 22:51:34,530 | Resolving code path.
Cwd=/Users/menglinmaker/Downloads/Dotnet6MinApiLambdaSample-main/.aws-sam/build,
CodeUri=/Users/menglinmaker/Downloads/Dotnet6MinApiLambdaSample-main/.aws-sam/build/Dotnet6MinApiLambda
2025-02-07 22:51:34,530 | Resolved real code path to
/Users/menglinmaker/Downloads/Dotnet6MinApiLambdaSample-main/.aws-sam/build/Dotnet6MinApiLambda
2025-02-07 22:51:34,530 | Code
/Users/menglinmaker/Downloads/Dotnet6MinApiLambdaSample-main/.aws-sam/build/Dotnet6MinApiLambda is not a zip/jar file
2025-02-07 22:51:38,742 | Local image is up-to-date
2025-02-07 22:51:38,764 | Checking free port on 127.0.0.1:6570
2025-02-07 22:51:38,775 | Using local image: public.ecr.aws/lambda/dotnet:8-rapid-arm64.
2025-02-07 22:51:38,777 | Mounting
/Users/menglinmaker/Downloads/Dotnet6MinApiLambdaSample-main/.aws-sam/build/Dotnet6MinApiLambda as /var/task:ro,delegated,
inside runtime container
2025-02-07 22:51:39,130 | Starting a timer for 3 seconds for function 'Dotnet6MinApiLambda'
2025-02-07 22:51:39,131 | Getting lock for the key localhost-6570
2025-02-07 22:51:39,131 | Waiting to retrieve the lock (localhost-6570) to start invocation
START RequestId: f4fdaaa1-9793-44b4-8719-a54aa161670a Version: $LATEST
END RequestId: a2a7f419-33c4-4485-ae84-a64765ffc646
REPORT RequestId: a2a7f419-33c4-4485-ae84-a64765ffc646 Init Duration: 0.05 ms Duration: 196.42 ms Billed Duration: 197 ms Memory Size: 128 MB Max Memory Used: 128 MB
2025-02-07 22:51:39,333 | [Container state] OOMKilled False
2025-02-07 22:51:39,512 | Cleaning all decompressed code dirs
2025-02-07 22:51:39,514 | Telemetry endpoint configured to be
https://aws-serverless-tools-telemetry.us-west-2.amazonaws.com/metrics
2025-02-07 22:51:39,564 | Telemetry endpoint configured to be
https://aws-serverless-tools-telemetry.us-west-2.amazonaws.com/metrics
2025-02-07 22:51:39,564 | Sending Telemetry: {'metrics': [{'commandRun': {'requestId':
'863edf19-4f34-4e60-8a9c-a125ead97020', 'installationId': '7bf6b43e-777b-4524-bcfb-bf5bbd405eb5', 'sessionId':
'db3ea8ef-f7c4-48e5-a5aa-83f61bd5f408', 'executionEnvironment': 'CLI', 'ci': False, 'pyversion': '3.11.10', 'samcliVersion':
'1.132.0', 'awsProfileProvided': False, 'debugFlagProvided': True, 'region': '', 'commandName': 'sam local invoke',
'metricSpecificAttributes': {'projectType': 'CFN', 'gitOrigin': None, 'projectName':
'b07f98a66fa397b0b2457d2cc1e57495ab951c55a89925ca215befe6d303bca5', 'initialCommit': None}, 'duration': 6496, 'exitReason':
'success', 'exitCode': 0}}]}
2025-02-07 22:51:39,565 | Unable to find Click Context for getting session_id.
2025-02-07 22:51:39,567 | Sending Telemetry: {'metrics': [{'events': {'requestId': 'f2e2ff0d-cf3a-4cdf-81f5-00b90f198401',
'installationId': '7bf6b43e-777b-4524-bcfb-bf5bbd405eb5', 'sessionId': 'db3ea8ef-f7c4-48e5-a5aa-83f61bd5f408',
'executionEnvironment': 'CLI', 'ci': False, 'pyversion': '3.11.10', 'samcliVersion': '1.132.0', 'commandName': 'sam local
invoke', 'metricSpecificAttributes': {'events': [{'event_name': 'SamConfigFileExtension', 'event_value': '.toml',
'thread_id': '3579de4bd0cd44ae868d5ef0a2f51b46', 'time_stamp': '2025-02-07 11:51:32.996', 'exception_name': None},
{'event_name': 'SamConfigFileExtension', 'event_value': '.toml', 'thread_id': '515a9451914949d0b932354e652d04e8',
'time_stamp': '2025-02-07 11:51:33.017', 'exception_name': None}]}}}]}
2025-02-07 22:51:40,098 | HTTPSConnectionPool(host='aws-serverless-tools-telemetry.us-west-2.amazonaws.com', port=443): Read
timed out. (read timeout=0.1)
2025-02-07 22:51:40,100 | HTTPSConnectionPool(host='aws-serverless-tools-telemetry.us-west-2.amazonaws.com', port=443): Read
timed out. (read timeout=0.1)
2025-02-07 22:51:40,100 | Telemetry endpoint configured to be
https://aws-serverless-tools-telemetry.us-west-2.amazonaws.com/metrics
2025-02-07 22:51:40,101 | Sending Telemetry: {'metrics': [{'runtimeMetric': {'requestId':
'f4971668-46f4-4f7a-a0a9-62e21bd51665', 'installationId': '7bf6b43e-777b-4524-bcfb-bf5bbd405eb5', 'sessionId':
'db3ea8ef-f7c4-48e5-a5aa-83f61bd5f408', 'executionEnvironment': 'CLI', 'ci': False, 'pyversion': '3.11.10', 'samcliVersion':
'1.132.0', 'runtimes': ['dotnet8']}}]}
2025-02-07 22:51:40,580 | HTTPSConnectionPool(host='aws-serverless-tools-telemetry.us-west-2.amazonaws.com', port=443): Read
timed out. (read timeout=0.1)
Expected result:
Should return some json array.
Additional environment details (Ex: Windows, Mac, Amazon Linux etc)
{
"version": "1.132.0",
"system": {
"python": "3.11.10",
"os": "macOS-15.1.1-arm64-arm-64bit"
},
"additional_dependencies": {
"docker_engine": "27.5.1",
"aws_cdk": "2.177.0 (build b396961)",
"terraform": "1.5.7"
},
"available_beta_feature_env_vars": [
"SAM_CLI_BETA_FEATURES",
"SAM_CLI_BETA_BUILD_PERFORMANCE",
"SAM_CLI_BETA_TERRAFORM_SUPPORT",
"SAM_CLI_BETA_RUST_CARGO_LAMBDA"
]
}
Hey there. Thanks for raising this. I was able to reproduce the issue. We will investigate more and will reach out if we need additional information.
The error happens because you are probably local invoking without providing an event. Please try sam local invoke with an APIGatewayHttpApi event. You can follow the steps below:
- Create an event.json file in your function's root directory with the following content:
{
"version": "2.0",
"routeKey": "GET /",
"rawPath": "/",
"rawQueryString": "",
"headers": {
"accept": "*/*",
"content-length": "0",
"host": "localhost:3000",
"user-agent": "curl/7.64.1",
"x-forwarded-proto": "http",
"x-forwarded-port": "3000"
},
"requestContext": {
"accountId": "123456789012",
"apiId": "api-id",
"domainName": "localhost:3000",
"domainPrefix": "localhost",
"http": {
"method": "GET",
"path": "/",
"protocol": "HTTP/1.1",
"sourceIp": "127.0.0.1",
"userAgent": "curl/7.64.1"
},
"requestId": "request-id",
"routeKey": "GET /",
"stage": "$default",
"time": "12/Mar/2020:19:03:58 +0000",
"timeEpoch": 1583348638390
},
"isBase64Encoded": false
}
- Run
sam local invoke -e event.json
Please let us know if you need anything else.