In this post we’ll look at some alternative solutions to the traditional loop. The great thing about the new functional features in Java 8, is that it allows us to say what we want to be done instead of saying how to do it. This is where loops fall short. Sure loops are flexible, but this flexibility doesn’t come without a price. A return, break or continue dramatically changes how the loop will act, forcing us not only to understand what the code is trying to achieve, but also understand how the loop works.
Let the coding begin!
This time we’re going to work with articles. An article has a title, an author and several tags.
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Spring Data MongoDB 1.2.0 silently introduced new feature: support for basic auditing. In this post I will show what benefits does it bring, how to configure Spring for auditing and how to annotate your documents to make them auditable. Auditing let you declaratively tell Spring to store: date when document has been created: @CreatedDate date when document has been updated last time: @LastModifiedDate user who has created document: @CreatedBy user who has done most recent update: @LastModifiedBy current document version: @Version Configuration First of all add Maven dependencies to latest Spring Data MongoDB and Spring Data Commons. Additionally in order to use date-related audit annotations we need to add joda-time to class-path.
<dependency> <groupId>org.springframework.data</groupId> <artifactId>spring-data-mongodb</artifactId> <version>1.2.1.RELEASE</version> </dependency> <dependency> <groupId>org.springframework.data</groupId> <artifactId>spring-data-commons</artifactId> <version>1.5.1.RELEASE</version> </dependency> <dependency> <groupId>joda-time</groupId> <artifactId>joda-time</artifactId> <version>2.2</version> </dependency> [.....]
Today, I want to show you debugging method, more specifically one for measuring execution times: Say hello to console.time().
Measuring Execution Times the Classic Way Here's a small JavaScript snippet which concatenates the first one million natural numbers: var i, output = ""; for (i = 1; i <= 1e6; i++) output += i;
If you're wondering what 1e6 means, it's just a short way to write ten to the sixth power, which equals one million. It means exactly the same as the number literal 1000000.
The script is very [.....]
Spring MVC provides a great way to handle exceptions and errors. @ExceptionHandler annotation is core to this feature. For each Spring controller we can simply define a method that automatically gets called if a given exception occurs. For example:
import org.springframework.web.bind.annotation.ExceptionHandler; //.. @ExceptionHandler(IOException.class) public String exception(Exception e) { //.. return "error"; } Thus whenever an IOException is raised from any controller method will call the above method exception(). We mapped IOException.class to this method using @ExceptionHandler annotation.
One short coming of this annotation is that it only handles exception getting raised from the controller where it is defined. It will not handle exceptions getting raised from other controllers. However this is a way to overcome this [.....]
It's no secret that my favorite browser is Google Chrome. I like it because it's fast, reliable, it doesn't crash (very often), and it looks good. There's also something else which I find even more valuable. It's the fact that you can build an extension for it using only HTML, CSS, and JavaScript. I always support such products, products that are open to the community and Chrome happens to be one of these products. If you need something and it is not yet implemented, you are free to develop [.....]
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