Spring-Boot Properties with nested Map

Question

I have a application.properties file that needs some dynamic keys, which allow at least one level of nesting. In technical terms, the application starts and I am able to read those values, but the metadata doesn't seem to work correctly, because IntelliJ Ultimate is giving me some errors:
Cannot resolve property 'foo' in java.util.Map

# Static property
com.company.version=1.0

# Dynamic property, starting after products
com.company.products.first.foo=firstFoo
com.company.products.first.bar=firstBar
com.company.products.second.foo=SecondFoo

import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Configuration;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;

@Configuration
@ConfigurationProperties(prefix = "com.company")
public class Properties {
    private String version;
    private Map<String, Map<String, ArrayList<String>>> products = new HashMap<>();

    public String getVersion() {
        return version;
    }

    public void setVersion(String version) {
        this.version = version;
    }

    public Map<String, Map<String, ArrayList<String>>> getProducts() {
        return products;
    }

    public void setProducts(Map<String, Map<String, ArrayList<String>>> products) {
        this.products = products;
    }
}

In additional I would like to know what the best practice would be to read those values. For "normal" static properties I used the Environment that I autowire in the constructor, but that is – as far as I know – unable to read the products map. Thats why I autowire my Properties class and use the getProducts function.

Thanks a lot for your help!

jeremyt · Accepted Answer · 2022-11-30 22:34:59Z

1

Might this work?

# Dynamic property, starting after products
com.company.products.first[foo]=firstFoo
com.company.products.first[bar]=firstBar
com.company.products.second[foo]=SecondFoo

If you want more than item in your array list do:

com.company.products.first[foo]=firstFoo,secondFoo

However, I've come massively unstuck in the past using deeply nested maps of maps. Maybe if you can declare a concrete class instead? Also, I'd suggest using interfaces rather than concrete collections (e.g. List rather than ArrayList, or maybe even a Set to prevent duplicates?)

answered Nov 30, 2022 at 22:34

jeremyt

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