The server side should send error code and error message. Is that all? Yes, basically it will work, but not perfect yet. What you need to do: 1. Differentiate known, user-readable errors from unknown, developer-readable errors. 2. Send an error ID to client side when there is an unknown error, with which the client …
How to let one fxml include another, e.g. let every scene has a "header" ? Note you have to set "fx:id=…" There must be a controller for the included fxml file. Let’s call it HeaderController public class HeaderController { @FXML private Text errorText; … Include the HeaderController in your controller public class LoginController { //the …
One way is to write the input stream to server side as a file and then validate that file. However, the uploading has happened. It will not prevent a user from uploading a huge file and taking up server side’s the bandwidth and hard disk. So we must do validation while reading the …
Code Snippet: Validate the size of uploaded file on server side Read More »
Don’t send all the stack trace of an exception to client if Apache Httpd is used as reverse proxy. Otherwise, it may return Http 502 to your client. It may say the following just because the response from your servlet container(tomcat etc.) is too big in size: 502 Bad Gateway The proxy server received …
Where to put the environment-specific properties files when using spring framework ? 1. Put it on classpath? Not acceptable. Classpath means the file will be put in git/svn repository and there will only be one newest copy of it. As a result, all environments will have a same property file. 2. Put it on an …
Where to put the environment-specific properties files when using spring framework ? Read More »
A restful resource’s method can be void. In this case, what should be sent to the client side in terms of http response body ? According to my experience, you must send an emtpy JSON or an empty XML depending on the content type, instead of sending nothing. In the latter case, some clients may …
The problem is, 1. Your web application’s domain name is www.foo.com 2. Your server IP is 123.123.123.123, and it sends emails to users from support@foo.com 3. When a user danni@gmail.com gets an email from it, GMAIL may consider it is spam because it doesn’t know whether 123.123.123.123 really represents support@foo.com . What you …
Add an SPF DNS record if you don’t want emails sent by your system defined as spam Read More »
SMTP access provided by 3rd-party sponsors such as Godaddy can be very unreliable. It may take seconds to setup a TCP connection or read and write data. As a result, the thread of sending an email may be blocked. In return, if this thread is a user thread, i.e., created to serve a user’s request, …
Email sending using others’ smtp server should done asynchronously Read More »
If you are with a auto-generated key, when you carry out a method like this public void saveNewUser(User user); what do you expect besides a new record in DB? You want the user.id also has been set after the execution. That’s what real ORM does With MyBatis, you can do it like the following. …
private static void printTimeMain() throws ParseException { // the computer which runs this program is of the time zone of China long someSummerMilis = DateUtils.parseDate(“2015-7-4 16:00:00”, new String[] { “yyyy-MM-dd HH:mm:ss” }).getTime(); long someWinderMilis = DateUtils.parseDate(“2015-11-11 16:00:00”, new String[] { “yyyy-MM-dd HH:mm:ss” }).getTime(); System.out .println(“==============when it is 2015-7-4 16:00:00 in China, the world’s times are==============”); …
Java Time Zone: It’s 9 o’clock here, what’s your time ? Read More »