How to load property file from classpath in AWS lambda java

Question

I have written AWS lambda function in that i want to read database connection details from property file and which in my classpath, but I am not able to load that file.Here is my code:

InputStream input = DBConfiguartion.class.getResourceAsStream("appsettings");

        Reader r = new InputStreamReader(input, "UTF-8");
        Properties prop = new Properties();
        prop.load(r);

If I run this code through normal java console application that time it is working, but whenever i run it as AWS lambda function then InputStream is coming null.

bclemenzi · Accepted Answer · 2016-03-01 16:24:51Z

10

You are only one character off. Here's a working example that I have to do the same thing:

InputStream is = DBConfiguartion.class.getResourceAsStream("/lambda.properties");
Properties properties = new Properties();
properties.load(is);

This works with the following maven file structure when building the deployment jar:

project
project/src/main/java
project/src/main/java/com/something/DBConfiguartion.java -
project/src/main/resources
project/src/main/resources/lambda.properties

answered Mar 1, 2016 at 16:24

bclemenzi

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2 Comments

naresh goty Over a year ago

i'm having same problem as specified in the issue description. Now when i change the property file name to begin with forward slash(/), then my local JUnit test is failing.

Mahesh Over a year ago

@greg . Can you check below UdoHeld's solution. He is suggesting to use ResourceBundle

Udo Held · Accepted Answer · 2017-08-15 13:04:39Z

2

As you want to load a properties file you can use the ResourceBundle to load the properties.

String version = ResourceBundle.getBundle("lambda").getString("version");

It's not the same as loading file as an InputStream, but this worked for me. In a maven project the file would need to be located at:

project/src/main/resources/lambda.properties

I have a simple Hello-World Lambda which reads the current version from a properties file on github.

answered Aug 15, 2017 at 13:04

Udo Held

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1 Comment

Mahesh Over a year ago

Hi, Udo.. Thank you for your suggestion. I was not aware of ResourceBundle before.

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