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  Handle NXDomain error when resolving IP address in Ruby DNS resolver

In another post, we covered how to resolve SystemStackError when resolving IP address in Ruby. In this post, we would cover another common issue where a NXDomain error is returned when resolving an IP address. The NXDomain error means that the queried domain name does not exist in the DNS. In Ruby, DNS resolver library will use /etc/resolv.conf by default get the name servers to resolve the domain name. There are multiple DNS name servers can be specified in /etc/resolv.conf with below format. ...

   RUBY,RUBY ON RAILS,NETWORK,DNS,NXDOMAIN     2017-07-16 01:39:23

  What can CSS :has pseudo class be used for?

CSS's :has is a pseudo-class representing an element if any of the selectors passed as parameters matching at least one element. From the name, it's also easy to understand how it matches elements. The syntax is pretty easy as well: :has([some-selector]) With this pseudo class, it can do lots of things which previously would be challenging or need tweaking the DOM elements with JavaScript. This post will demonstrate what :has can be used for. Introduction Below are a few simple ex...

   CSS,:HAS,:NOT,PSEUDO CLASS     2022-09-18 01:40:54

  Java 9 release is delayed again

The original Java 9 planned release date is March 2017. But latest source shows that Java 9 release will be delayed again to July 2017. It's four months later than the planned date. Oracle Chief Architect of Java Platform group Mark Reinhold proposes this new release date in a message sent on the OpenJDK mailing list.  Despite this progress, at this point it's clear that Jigsaw needs more time. We recently received critical feedback that motivated a redesign of the module ...

   JAVA,RELEASE DATE,JAVA 9,JAVA 9 DELAY     2016-09-26 12:22:53

  OpenLDAP Proxy -- rwm-map vs map

OpenLDAP proxy is used to proxy ldap request and response between clients and servers, different servers may have different representations/attributes to mean the same thing. For example, in one LDAP server, the firstName may be represented by firstName, it may be represented by givenName in a different server. However, from the client perspective, it only wants to get the firstName, it doesn't care about the backend attributes. In this case, attribute mapping can help provide a virtual view of ...

   MAP,OPENLDAP,OPENLDAP PROXY,LDAP,RWM-MAP     2018-02-02 20:36:02

  The Evolution of a Programmer

High School/Jr.High 10 PRINT "HELLO WORLD" 20 END First year in College program Hello(input, output) begin writeln('Hello World') end. Senior year in College (defun hello (print (cons 'Hello (list 'World)))) New professional #include <stdio.h> void main(void) { char *message[] = {"Hello ", "World"}; int i; for(i = 0; i < 2; ++i) printf("%s", message[i]); printf("\n"); } Seasoned professional #include <iostream....

   Humour,Evolution,Programmer     2012-04-23 06:30:33

  Add compiler argument to build Maven project

Maven is a software project to manage a project's build, reporting and documentation from a central piece of information. It's now widely used t build and deploy projects. It can help automatically maintain the dependencies of projects. There is a central project configuration file named pom.xml. Here you can configure the project you want to build.  In this post, we will show you how to add compiler argument when using javac to compile Java source code. Sometimes we need to pass compi...

   Maven,compiler argument, compiler option, Java 8     2015-04-10 21:59:00

  Browse OpenJDK Java source code in Eclipse

Java 8 was recently released, many developers are now trying to extract the source code of Java 8 to find out how the new added features such as Lambda expressions, default method in interfaces, new Time API are implemented. How do you manage to download and browse the source code? Today we are going to show how to extract OpenJDK Java source code to Eclipse. Since OpenJDK is adopting Mercurial as its distributed version control system, you need to install Mercurial on your computer first before...

   OpenJDK,Java 8,Source code,Eclipse     2014-06-16 00:53:34

  Signature sign/verification demo in Java

Digital signature is commonly used in areas where data authentication and integrity are required. It is extremely important to have signature while transferring sensitive data from one peer to other peers through network since there might be malicious applications or man-in-the-middle attacks which may alter the data along the way. Java provides some APIs to generate and verify digital signature. One important class is Signature.  When generating the signature, a private key needs to be pa...

   SECURITY,JAVA,SIGNATURE     2015-11-21 09:48:12

  Google launches Google Keep

According to Tencent Tech, Google announced the launch of Google Keep on Wednesday This is a note application similar to Evernote, its philosophy is to help you save everything you want to remember, including text and images and other notes, they can be instantly synchronized among different devices so that users can get the information they want at any time. This is a free service, it provides support for Web and Android 4.0 or later devices, users can navigate to Drive.Google.com/Keep or downl...

   Google Keep,Evernote,Synchronization     2013-03-21 13:00:02

  How Cloud Technologies Are Taking Over the World

Cloud technologies are some of the biggest accelerators of innovation today. The demand for increased speed and service delivery is driving the adoption and development of cloud platforms across industries. Gartner forecasts that the global public cloud service market will reach US$331.2 billion (S$455.83) in 2022, enjoying a 12.6% compounded annual growth rate. In Southeast Asia alone, it is estimated to reach US$40.32 billion (S$55.59 billion) by 2025 with a growing adoption among small and m...

   CLOUD,CLOUD COMPUTING     2019-10-18 12:12:12

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