Accessing AWS Lambda environment variables in Java code

Question

The AWS has introduced Environment variables for accessing in the Lambda function. I could not find any documentation which shows how to access the environment variables from the Lambda function using Java. Can anyone help me?

score 117 · Accepted Answer · edited Mar 25 '18 at 10:42

117

you can get them with:

System.getenv("NAME_OF_YOUR_ENV_VARIABLE")

edited Mar 25 '18 at 10:42

Shashank Agrawal

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answered Dec 12 '16 at 07:22

hellomichibye

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Just a note, in windows (**in general**), we should restart our IDE if the environment variable was created **after** the IDE is opened. – Richard Lee Oct 28 '17 at 12:12
@RichardLee what? – MarcioB Nov 09 '17 at 10:02
Hi @MarcioB, so, i'm using IntelliJ and i had to restart it, but it does not appeared so obvious to me at first moment. Just for help someone with it. – Richard Lee Nov 12 '17 at 13:56
@RichardLee but those are environment variables inside a lambda in AWS, so why do you need to create them in your OS? – MarcioB Nov 13 '17 at 14:02
To do test locally – Richard Lee Nov 13 '17 at 17:34
2

Will it give the same result with System.getProperty() ? – krackoder Nov 30 '17 at 21:56
You will need to setup SAM Local for this purpose and you can then easily set the environment variable in a separate file and provide at run time. – Kundan Ray Sep 13 '18 at 08:28
I also used same thing recently. – BishalG Aug 14 '20 at 06:53

score 4 · Answer 2 · answered Jan 16 '17 at 11:42

4

If You are using Spring Core then PropertySourcesPlaceholderConfigurer class can be initialized as a part of Configuration and then @Value("${RESOURCE_URL}") annotation can be used to access environment variables.

@Bean
public static PropertySourcesPlaceholderConfigurer placeholderConfigurer() {
    return new PropertySourcesPlaceholderConfigurer();
}

@Value("${RESOURCE_URL}")
private String url;

answered Jan 16 '17 at 11:42

dassum

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In a lambda aws we can use spring ? – EdwinCab May 08 '20 at 19:28
yes, you can, but only use bare minimum dependency to keep the jar size small. – dassum May 09 '20 at 05:46
In this case, if I want to use @Bean, what it's de minimun dependency that's have to use ? – EdwinCab May 09 '20 at 22:49

score 0 · Answer 3 · edited Aug 14 '20 at 06:21

0

I am using this -

System.getenv("VAR_NAME");

This works pretty well.

edited Aug 14 '20 at 06:21

Darren Tsai

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answered Aug 14 '20 at 01:04

Himangshu Das

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score 0 · Answer 4 · answered Mar 05 '22 at 16:36

0

If you define environment variable in aws lambda with key as "MyKey" and value as "XYX" then I will use:

System.getenv("MyKey");

answered Mar 05 '22 at 16:36

Akshay Khule

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Accessing AWS Lambda environment variables in Java code

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