connection

Java outgoing TCP connection failover based on multiple DNS results

由 我与影子孤独终老i 提交于 2019-12-04 11:35:39
If I make a connection using new Socket("unit.domain.com", 100) and the unit.domain.com DNS record has multiple IP addresses in the A record.. In the event of a failed connection, Does Java automatically connect to one of the other addresses in the list like the browser does? or does that have to be implemented manually? bestsss No! Creating a socket via new Socket(String, int) results in a resolving like that addr = InetAddress.getByName(hostname); which is a shortcut for return InetAddress.getAllByName(host)[0]; The address resolution is performed in the Socket c-tor. If you have to

How to replace default hikari cp to tomcat pool on spring boot 2.0

由 谁都会走 提交于 2019-12-04 11:06:30
问题 I have migrated spring boot application to 2.0 and found out some problems with hikari connection pool. When I am fetching database data this results to hikari cp timeout ie. connection is not available. I don't know why when in the previous version this worked correctly. Therefore I tried to use tomcat pool with this config in application.yml but it did not work (in correct YAML formatting). spring.datasource.type=org.apache.tomcat.jdbc.pool.DataSource My pom.xml has these dependencies

iOS to Mac OS X [core] bluetooth data transfer

由 半城伤御伤魂 提交于 2019-12-04 11:04:54
My objective here is to create a connection between a device running iOS to a device running Mac OS X , via bluetooth. I know that I might be able to use CoreBluetooth for this but I don't understand how since I don't see a method to setup a service on the iOS device and broadcast it as an available service for a device running Mac OS X . In other words, I simply want to setup a connection to get the iOS device to send data to the Mac OS X device . Also, how would I go about to specify how to setup properties of the service. I've tried researching this stuff but most of the documentation makes

Using Directory.Exists on a network folder when the network is down

由 社会主义新天地 提交于 2019-12-04 10:44:03
问题 My company's code base contains the following C# line: bool pathExists = Directory.Exists(path); At runtime, the string path happens to be the address of a folder on the company's intranet - something like \\company\companyFolder . When the connection from my Windows machine to the intranet is up, this works fine. However, when the connection goes down (as it did today), executing the line above causes the application to freeze completely. I can only shut the application down by killing it

Connecting to web services using Rails (HTTP requests)?

由 |▌冷眼眸甩不掉的悲伤 提交于 2019-12-04 09:37:49
问题 I am using Ruby on Rails 3 and I am trying to implement APIs to retrieve account information from a web service. That is, I would like to connect to a web service that has the Account class and get information from the show action routed at the URI http://<site_name>/accounts/1 . At this time, in the web service accounts_controller.rb file I have: class AccountsController < ApplicationController def show @account = Account.find(params[:id]) respond_to do |format| format.html format.js format

Entity Framework - How should I instance my “Entities” object

由 走远了吗. 提交于 2019-12-04 07:58:25
问题 I'm a total newbie at Entity Framework and ASP.Net MVC, having learned mostly from tutorials, without having a deep understanding of either. (I do have experience on .Net 2.0, ADO.Net and WebForms) My current doubt comes from the way I'm instancing my Entities objects. Basically I'm doing this in my controllers: public class PostsController : Controller { private NorthWindEntities db = new NorthWindEntities(); public ActionResult Index() { // Use the db object here, never explicitly Close

Unable to acquire image through ImageIO.read(url) because of connection timed out

由 喜你入骨 提交于 2019-12-04 07:45:00
The following code always seems to fail: URL url = new URL("http://userserve-ak.last.fm/serve/126/8636005.jpg"); Image img = ImageIO.read(url); System.out.println(img); I've checked the url, and it is a valid jpg image. The error I get is: Exception in thread "main" javax.imageio.IIOException: Can't get input stream from URL! at javax.imageio.ImageIO.read(ImageIO.java:1385) at maestro.Main2.main(Main2.java:25) Caused by: java.net.ConnectException: Connection timed out at java.net.PlainSocketImpl.socketConnect(Native Method) at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl

Mysql2: close client connection

由 人盡茶涼 提交于 2019-12-04 07:35:40
I am using Mysql2 to query a database on ruby . I initialize the connection by: client = Mysql2::Client.new(:host => "localhost", :database => 'mydb', :username => "root") Once the query is done successfully, how can I close the client connection? If I do not close it, I soon reach the maximum number of possible open connections. Solution Thanks to @joonty: client.close Use client.close . From the docs : Mysql2::Client#close Immediately disconnect from the server, normally the garbage collector will disconnect automatically when a connection is no longer needed. Explicitly closing this will

unable connect to server from application on device

由 北战南征 提交于 2019-12-04 06:39:08
问题 I have problem with testing my application on device. I already successfully open the localhost in browser from my device, but when i enter my ip to connect my application with web service it didn't work. I always get the "unfortunately, [my apps name] has stopped" message. Anyone who knows about this problem, please help me. I really need help to solve this. thank you very much logcat - i get it from usb debug on device 06-10 11:31:15.551: D/dalvikvm(14590): Late-enabling CheckJNI 06-10 11

android UDP connection, not receiving any data

由 為{幸葍}努か 提交于 2019-12-04 06:37:20
问题 Im a newbie in this so please escuse me if i ask dumb questions. Im trying to make a UDP connection between Eclipse's PC Emulator & a android phone (or between two android phone devices). I have a router and the phone connects to the internet thru router's wifi network. The PC is on same network also (direct cable router-PC connection). Im trying to send some text data from Server thread to Client thread but nothing is received/sent. :( The Server java class ( RE-EDITED, Server receives msg.
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