> For the complete documentation index, see [llms.txt](https://ondrej-kvasnovsky-2.gitbook.io/design-patterns-handbook/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ondrej-kvasnovsky-2.gitbook.io/design-patterns-handbook/anti-patterns/error-codes.md).

# Error Codes

When the error codes escape from a system to clients, then they are supposed to find the solution based on the code. Forcing users to decrypt error code and find a solution is very irritating.

```
public class ExceptionErrorCodes {

    public static final int FIELD_MUST_BE_EMPTY = 101;

    public static final int FIELD_MUST_NOT_BE_EMPTY = 102;

    public static final int CANNOT_RETRIEVE_TASK = 103;

    public static final int FIELD_CANNOT_BE_MODIFIED = 104;

    public static final int MYBATIS_EXCEPTION = 103;

    public static final int CSV_INVALID_FIELD_EXCEPTION = 104;

    public static final int CSV_NO_HEADER_FOUND_EXCEPTION = 105;

    public static final int FILE_UPLOAD_EXCEPTION = 107;

    public static final int CATCHALL_EXCEPTION = 999;
}
```