AWS Lambda Java功能成功但超时

I created a basic AWS Lambda java function to convert an xml message to json. The function is triggered off of an S3 event (message is converted and dropped in different S3 bucket). It appears to be successful, I can see the steps in cloudwatch and the converted message is in the S3 destination bucket. However, I see the timeout warning in the cloud watch logs (set timeout to 15 seconds). I must be missing something, definitely a newby when it comes to Lambda. Do I need to provide the context with a done or success? Any suggestions or tips would be greatly appreciated. I created a basic AWS Lambda java function to c