MyLambda.java

import com.amazonaws.services.dynamodbv2.AmazonDynamoDBClientBuilder;
import com.amazonaws.services.dynamodbv2.document.*;

public class MyLambda {
    private final DynamoDB dynamoDB;
    private final String tableName;

    public MyLambda() {
        this.dynamoDB = new DynamoDB(AmazonDynamoDBClientBuilder.defaultClient());
        this.tableName = System.getenv("LOCATIONS_TABLE");
    }

    public void handler(java.util.Map<String, String> input) {
        Table table = dynamoDB.getTable(tableName);
        Item item = new Item()
                .withPrimaryKey("id", input.get("ID"))
                .withString("value", input.get("value"));
        table.putItem(item);
    }
}