While going through Oracle docs reading about Nested classes, I found this piece of code whose output I could not understand. Can someone please explain this ? The following is the output of this example: The original code can be found here Answer The local variable x shadows this.x and ShadowTest.this.x. The…
Serving HTML pages in a Spring Boot application
I have a Spring Boot Application. I am trying to pass a variable to a HTML page but unfortunately I cannot seem to do it, on application start nothing is rendered except the static text: “WORLD”. My controller is as below: And my index.html: I was looking for an answer and I found these articles: …
Generating 10 random numbers without duplicate with fundamental techniques
my intend is to use simplest java (array and loops) to generate random numbers without duplicate…but the output turns out to be 10 repeating numbers, and I cannot figure out why. Here is my code: Answer You need to break out of the for loop if either of the conditions are met. This will make YOUR code w…
Java Determine If String Starts With Key In Map
I want to determine if a given String startsWith any key in a Map. The simple solution is to iterate through entire the keySet. My question is: Is there is a better data structure to handle this problem? Answer This can’t be done directly with an HashMap: the problem is that HashMap uses an hash calcula…
java.lang.NoClassDefFoundError: javax/servlet/ServletContext
I just upgraded to IntelliJ 15.0 from 14.1 (I was in a hurry and forgot to save the previous plug state for 14.1) and I’m attempting to configure general run/debug configuration settings with Spring Boot in Intellij using Gradle. In the configuration tab I have added 1) the Main class, 2) JRE, and 3) cl…
unable to run Htmlunit application using Maven dependency
I have added Htmlunit Maven dependency by adding the following to my pom.xml When I am trying to run the application, I am getting the following error: The following is my pom.xml, as my pom.xml is very lengthy I have removed some of the sections like properties, profiles, etc. Answer You need to remove the d…
Gradle: Build ‘fat jar’ with Spring Boot Dependencies
I am using Gradle to build and package a very simple spring boot application (99% static content) into a jar with embedded tomcat. I tried creating said jar, at first the result was 86k and did not launch, because it was missing some Spring boot classes. I concluded this jar I made contained none of the appli…
Android Https web service communication (SSL / TLS 1.2)
In my Android application I’ve got to communicate with a https web service and read the response. I’ve informed the server configured SSL with TLS 1.2. I am using the following sample code to connect with the service (https get request), but only the devices that runs Android 5.0 or above can succ…
How have RecursiveToStringStyle and JSON_STYLE using commons-lang3
I’m using the dependency: I have the following objects: And I need to log the content of the class X recursively to get the class Y as well and using the JSON style. That is my goal and this is the purpose of this question. Approach 1: Approach 1 result: Approach 2: Approach 2 result: Successful Approac…
Find Percentage of difference between two Videos Using FFMPEG
I am working with Video comparison using FFmpeg on Java. I have videos name “video1 and Video2”. I can find the difference between two video using FFmpeg. It shows the result Video with difference. But here I want to find how many percent (IE: 20%) Video1 different from Video2. How to achieve this…