I am trying to get frames from a gif using OpenCV. I found Convert each animated GIF frame to a separate BufferedImage and used the second suggestion. I modified it slightly to return an array of Mats instead of BufferedImages. I tried two methods to get bufferedImages from the gif. Each presented different p…
Initialize List<List> in Java
How can I initialize List<List<Integer>> in Java? I know List is an interface and I can use ArrayList or LinkedList to implement List<Integer> list = new ArrayList<Integer>(), but when I initialize List<List<Integer>> list = new ArrayList<ArrayList<Integer>>(); …
Differences between W, \W, [^a-zA-Z0-9_] in regular expression
I am trying to find all characters, which are not letters(upper/lowercase), numbers, and underscore, and remove it. However, the following code could not even compile in Java: If I use only “\W” rather than “W”, the above code turns out to be correct. So, what is the differences betwee…
java.lang.NoClassDefFoundError with Intellij And Maven
I am working with Maven 3.0.5 and Intellij 14.0.2 and Maven is not copying the required Jars in my project’s calsspath so I am copying it manually and trying to exccute the main class of my project it is throwing me following error: I know its very common and found a bunch of solutions at StackOverflow …
HP Fortify SQL injection issue on preparedStatement in java
I am using HP Fortify to measure code quality of my java code. HP Fortify is reporting SQL Injection error on so how to resolve this? Answer From my experience, HP Fortify will report an error on this scenario if it cannot trace the origin of all the Strings you are using to build your queryString to constant…
Automatically delegating all methods of a java class
Say I have a class with many of public methods: Now I would like to create a wrapper class which would delegate all the methods to wrapped instance (delegate): Now if MyClass has a lot of methods I would need to override each of them which is more or less the same code which just “delegates”. I wa…
Java 8 filter with method call
I am learning Java 8 lambda and streams and trying some examples. But facing problem with it. here is my code Am getting compilation error in .map addr(second argument) field. what wrong in it and could you please provide links to learn java 8 streams. FYI am following this link Java 8 lambda Answer The first…
Difference between * and ? in Spring @Scheduled(cron=“…”)
I’ve been looking at the Spring Boot example for scheduling tasks (https://spring.io/guides/gs/scheduling-tasks/) and reading through some documentation (https://javahunter.wordpress.com/2011/05/05/…
Downloading image from Url in java.Server returned HTTP response code: 403 error. How can I get the connection to work?
I am trying to downloada picture from a certain url, but cant do so because I somehow have to give the right userclient to the website.I am sure the problem is that I cant give the user client while using the Url class, because the page can be accesed via browser. I tried using proxy and Urlconnection but cou…
Error Injecting FeignClient from another Project
I am having trouble auto wiring a feign client from another project. It appears that the implementation of the feign client is not being generated and injected. This is the error I am getting. The feign client is pretty straight forward. I have removed the imports for brevity. I added the component scan to my…