How to define error codes and error messages in Java?

In Java, we can use Enum to store the error codes and corresponding error messages. We can always keep this a config file but keeping it inside Enum is a standard choice. When we generate documentation of the code, the messages get updates as we change it in the code.

public enum Errors {
    DATABASE(0, "A database connection error has occured."),
    DUPLICATE_USER(1, "This username or email already available in our system.");

    private final int code;
    private final String description;

    private Errors(int code, String description) {
        this.code = code;
        this.description = description;
    }

    public String getDescription() {
        return description;
    }

    public int getCode() {
        return code;
    }

    @Override
    public String toString() {
        return code + ": " + description;
    }
}
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