This will get environment variables from AWS Lambda

DBHelper.java

//http://docs.aws.amazon.com/lambda/latest/dg/env_variables.html
public static Sql2o getSql2oInstance() {
    //These will get environment values from the AWS Lambda, 
    //which are declared in the Lambda web page.
    final String host = System.getenv("host");
    final String port = System.getenv("port");
    final String schema = System.getenv("schema");
    final String username = System.getenv("username");
    final String password = System.getenv("password");   
    
    return new Sql2o("jdbc:mariadb://" + host + ":" + port + "/" + schema, username, password);     
}

is there a way to update an environment variable. I cant find system.setenv or any anything similar to update.
The goal is hash data that can be updated