Tag: Spring Boot

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How to bind @RequestParam to object in Spring

Do you have multiple parameters annotated with @RequestParam in a request mapping method and feel it isn’t readable?

The annotation looks pretty straightforward when there’s one or two input parameters expected in a request but when the list gets longer you might feel overwhelmed.

You cannot use the @RequestParam annotation inside objects but it doesn’t mean you’re left with no other solution. In this post, I’m going to show you how to bind multiple request parameters to an object in Spring application.

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Spring Boot application.properties file

Spring Boot comes with a built-in mechanism for application configuration using a file called application.properties. In this article, I’ll show you how to effectively use the application.properties file in custom scenarios.

I’m not going to discuss properties specified by the Spring Boot framework. Working with existing configuration keys is pretty straightforward. You can easily find common keys in the official documentation.

This post covers defining custom properties, handling data types, and working with properties on different runtime environments. If that’s what you’re looking for, keep on reading.

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Spring Custom Validator by example

Since you’re here, you probably reach the point in which standard annotations like @NotNull or @Size don’t meet your expectations. Fortunately, I have good news for you. Creating a custom validation annotation is pretty easy. In this post, you will learn how to create a custom constraint annotation and a corresponding validator class. You will also see how to use Spring beans inside a custom validator.

Let’s just right into it.

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HTTP cache with Spring examples

Caching is a powerful feature of the HTTP protocol but for some reason, it’s mainly considered for static resources like images, CSS stylesheets, or JavaScript files. However, HTTP caching isn’t limited to application’s assets as you can also use it for dynamically computed resources.

With a small amount of work, you can speed up your application and improve the overall user experience. In this article, you will learn how to use the built-in HTTP response cache mechanism for Spring controller’s results.

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Feature toggle in Spring Boot 2

Whether you like it or not, software development is a collaborative activity. Integration work has always been demonized and treated as necessary evil. There are several approaches which try to solve the challenge of effective integration. The feature toggle belongs to that group. In this article, you’ll see in practice how feature toggles, also known as feature flags, can be used in your Spring Boot application.

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Sending HTML email with Spring Boot and Thymeleaf

Sending an email from the backend application part is a quite common use case in the world of enterprise applications. Although HTML content isn’t standardized message format, numerous mail clients support at least a subset of the markup language. In this post you will learn how to send an HTML email using Spring Boot standard modules and prepare an HTML content for a message using Thymeleaf template engine.

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Faster Spring Boot startup

As software developers, we always look for opportunities to improve our efficiency at work and optimize repeatable activities. One of them is application startup. Even if you cover your production code with unit tests and follow TDD, from time to time checking how the whole application works is inevitable. The more often you run it, the more time is wasted on waiting until the application is ready to operate.

Although the fast restart provided by Spring Boot DevTools is helpful for library class loading, it doesn’t solve the issue with the long startup of your own application code. From this post you will learn how to decrease the total number of coffee breaks in daily work by configuring faster Spring Boot startup in your local development environment.

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