Bug: No message from the Maven's stderr in the sam output logs

[usmanovbf]

Description:

I am trying to execute
MAVEN_OPTS="-DskipTests=true" sam build --debug --cached and getting the error with no maven error message - it is empty but appears in the depths of the aws-lambda-builders library

Steps to reproduce:

Execute the $ MAVEN_OPTS="-DskipTests=true" sam build --debug --cached

Observed result:

2023-05-12 03:23:05,439 | Maven logs: 
Maven Failed: {message}
2023-05-12 03:23:05,440 | JavaMavenWorkflow:MavenBuild failed
Traceback (most recent call last):
  File "/usr/local/Cellar/aws-sam-cli/1.82.0/libexec/lib/python3.8/site-packages/aws_lambda_builders/workflows/java_maven/actions.py", line 39, in execute
    self.subprocess_maven.build(self.scratch_dir)
  File "/usr/local/Cellar/aws-sam-cli/1.82.0/libexec/lib/python3.8/site-packages/aws_lambda_builders/workflows/java_maven/maven.py", line 34, in build
    raise MavenExecutionError(message=stdout.decode("utf8").strip())
aws_lambda_builders.workflows.java_maven.maven.MavenExecutionError: Maven Failed: 

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/Cellar/aws-sam-cli/1.82.0/libexec/lib/python3.8/site-packages/aws_lambda_builders/workflow.py", line 369, in run
    action.execute()
  File "/usr/local/Cellar/aws-sam-cli/1.82.0/libexec/lib/python3.8/site-packages/aws_lambda_builders/workflows/java_maven/actions.py", line 42, in execute
    raise ActionFailedError(str(ex))
aws_lambda_builders.actions.ActionFailedError: Maven Failed: 

Build Failed
2023-05-12 03:23:05,509 | Telemetry endpoint configured to be https://aws-serverless-tools-telemetry.us-west-2.amazonaws.com/metrics
2023-05-12 03:23:05,513 | Telemetry endpoint configured to be https://aws-serverless-tools-telemetry.us-west-2.amazonaws.com/metrics
2023-05-12 03:23:05,513 | Unable to find Click Context for getting session_id.
Error: JavaMavenWorkflow:MavenBuild - Maven Failed: 

Expected result:

Get the non-empty error message from Maven which should be retrieved from the stderr variable on the aws_lambda_builders/workflows/java_maven/maven.py:49 line

Additional environment details (Ex: Windows, Mac, Amazon Linux etc)

1. OS:

$ uname -a
Darwin my-laptop 22.4.0 Darwin Kernel Version 22.4.0: Mon Mar  6 21:00:17 PST 2023; root:xnu-8796.101.5~3/RELEASE_X86_64 x86_64

3. sam --version: SAM CLI, version 1.82.0
4. AWS region: eu-west-1

{
  "version": "1.82.0",
  "system": {
    "python": "3.8.16",
    "os": "macOS-13.3.1-x86_64-i386-64bit"
  },
  "additional_dependencies": {
    "docker_engine": "20.10.12",
    "aws_cdk": "Not available",
    "terraform": "1.4.6"
  }
}

[mndeveci]

Thanks for raising this issue!

I think we need to log the stderr from Maven in here https://github.com/aws/aws-lambda-builders/blob/develop/aws_lambda_builders/workflows/java_maven/maven.py#LL31C67-L31C67

We are happy to review the change if you would like to raise a PR.