Baeldung Pro comes with both absolutely No-Ads as well as finally with Dark Mode, for a clean learning experience:
Once the early-adopter seats are all used, the price will go up and stay at $33/year.
Azure Container Apps is a fully managed serverless container service that enables you to build and deploy modern, cloud-native Java applications and microservices at scale. It offers a simplified developer experience while providing the flexibility and portability of containers.
Of course, Azure Container Apps has really solid support for our ecosystem, from a number of build options, managed Java components, native metrics, dynamic logger, and quite a bit more.
To learn more about Java features on Azure Container Apps, visit the documentation page.
You can also ask questions and leave feedback on the Azure Container Apps GitHub page.
Azure Container Apps is a fully managed serverless container service that enables you to build and deploy modern, cloud-native Java applications and microservices at scale. It offers a simplified developer experience while providing the flexibility and portability of containers.
Of course, Azure Container Apps has really solid support for our ecosystem, from a number of build options, managed Java components, native metrics, dynamic logger, and quite a bit more.
To learn more about Java features on Azure Container Apps, you can get started over on the documentation page.
And, you can also ask questions and leave feedback on the Azure Container Apps GitHub page.
Modern software architecture is often broken. Slow delivery leads to missed opportunities, innovation is stalled due to architectural complexities, and engineering resources are exceedingly expensive.
Orkes is the leading workflow orchestration platform built to enable teams to transform the way they develop, connect, and deploy applications, microservices, AI agents, and more.
With Orkes Conductor managed through Orkes Cloud, developers can focus on building mission critical applications without worrying about infrastructure maintenance to meet goals and, simply put, taking new products live faster and reducing total cost of ownership.
Try a 14-Day Free Trial of Orkes Conductor today.
Modern software architecture is often broken. Slow delivery leads to missed opportunities, innovation is stalled due to architectural complexities, and engineering resources are exceedingly expensive.
Orkes is the leading workflow orchestration platform built to enable teams to transform the way they develop, connect, and deploy applications, microservices, AI agents, and more.
With Orkes Conductor managed through Orkes Cloud, developers can focus on building mission critical applications without worrying about infrastructure maintenance to meet goals and, simply put, taking new products live faster and reducing total cost of ownership.
Try a 14-Day Free Trial of Orkes Conductor today.
Mocking is an essential part of unit testing, and the Mockito library makes it easy to write clean and intuitive unit tests for your Java code.
Get started with mocking and improve your application tests using our Mockito guide:
Handling concurrency in an application can be a tricky process with many potential pitfalls. A solid grasp of the fundamentals will go a long way to help minimize these issues.
Get started with understanding multi-threaded applications with our Java Concurrency guide:
Spring 5 added support for reactive programming with the Spring WebFlux module, which has been improved upon ever since. Get started with the Reactor project basics and reactive programming in Spring Boot:
Since its introduction in Java 8, the Stream API has become a staple of Java development. The basic operations like iterating, filtering, mapping sequences of elements are deceptively simple to use.
But these can also be overused and fall into some common pitfalls.
To get a better understanding on how Streams work and how to combine them with other language features, check out our guide to Java Streams:
Explore Spring Boot 3 and Spring 6 in-depth through building a full REST API with the framework:
Yes, Spring Security can be complex, from the more advanced functionality within the Core to the deep OAuth support in the framework.
I built the security material as two full courses - Core and OAuth, to get practical with these more complex scenarios. We explore when and how to use each feature and code through it on the backing project.
You can explore the course here:
All Access is finally out, with all of my Spring courses. Learn JUnit is out as well, and Learn Maven is coming fast. And, of course, quite a bit more affordable. Finally.
>> GET THE COURSE
Spring Data JPA is a great way to handle the complexity of JPA with the powerful simplicity of Spring Boot.
Get started with Spring Data JPA through the guided reference course:
End-to-end testing is a very useful method to make sure that your application works as intended. This highlights issues in the overall functionality of the software, that the unit and integration test stages may miss.
Playwright is an easy-to-use, but powerful tool that automates end-to-end testing, and supports all modern browsers and platforms.
When coupled with LambdaTest (an AI-powered cloud-based test execution platform) it can be further scaled to run the Playwright scripts in parallel across 3000+ browser and device combinations:
Yes, we're now running our Spring Sale. All Courses are 25% off until 26th May, 2025:
Yes, we're now running our Spring Sale. All Courses are 25% off until 26th May, 2025:
The Apache HTTP Client is a very robust library, suitable for both simple and advanced use cases when testing HTTP endpoints. Check out our guide covering basic request and response handling, as well as security, cookies, timeouts, and more:
1. Overview
In this tutorial, we’re going to explore WebClient filters in Spring WebFlux, a functional, reactive web framework.
2. Request Filters
A filter can intercept, examine, and modify a client request (or response). Filters are very suitable for adding functionality to every single request since the logic stays in one place. Use cases include monitoring, modifying, logging, and authenticating client requests, just to mention a few.
A request has an ordered chain of zero or more filters.
In Spring Reactive, filters are instances of the functional interface ExchangeFilterFunction. The filter function has two parameters: the ClientRequest to modify and the next ExchangeFilterFunction.
Usually, a filter function returns by calling the next one in the filter chain:
ExchangeFilterFunction filterFunction = (clientRequest, nextFilter) -> {
LOG.info("WebClient fitler executed");
return nextFilter.exchange(clientRequest);
};3. WebClient Filtering
After implementing a request filter, we have to “attach” it to the WebClient instance. This can be only done while creating the WebClient.
So then, let’s see how to create a WebClient. The first option is to invoke WebClient.create() with or without a base URL:
WebClient webClient = WebClient.create();This, unfortunately, doesn’t allow to add a filter. The second option, then, is the one we’re looking for.
By using the WebClient.builder() we’re able to add filters:
WebClient webClient = WebClient.builder()
.filter(filterFunction)
.build();4. A Custom Filter
Let’s start with a filter that counts the HTTP GET requests sent by the client.
The filter examines the request method and increases a “global” counter in case of a GET request:
ExchangeFilterFunction countingFunction = (clientRequest, nextFilter) -> {
HttpMethod httpMethod = clientRequest.method();
if (httpMethod == HttpMethod.GET) {
getCounter.incrementAndGet();
}
return nextFilter.exchange(clientRequest);
};The second filter we’ll define appends a version number to the request URL path. We utilize the ClientRequest.from() method to create a new request object from the current one and set the modified URL.
Subsequently, we continue executing the filter chain with the new modified request object:
ExchangeFilterFunction urlModifyingFilter = (clientRequest, nextFilter) -> {
String oldUrl = clientRequest.url().toString();
URI newUrl = URI.create(oldUrl + "/" + version);
ClientRequest filteredRequest = ClientRequest.from(clientRequest)
.url(newUrl)
.build();
return nextFilter.exchange(filteredRequest);
};Next, let’s define a filter to log the methods of sent requests along with their URLs. These details are available in the request object.
All we have to do then is to print to some output stream:
ExchangeFilterFunction loggingFilter = (clientRequest, nextFilter) -> {
printStream.print("Sending request " + clientRequest.method() + " " + clientRequest.url());
return nextFilter.exchange(clientRequest);
};5. A Standard Filter
Finally, let’s look into basic authentication – a very common use case of request filtering.
The helper class ExchangeFilterFunctions offers the basicAuthentication() filter function which takes care of adding the authorization header to the request.
As a result, we don’t need to define a filter for it:
WebClient webClient = WebClient.builder()
.filter(ExchangeFilterFunctions.basicAuthentication(user, password))
.build();
6. Conclusion
In this short article, we have explored filtering WebFlux clients in Spring.
The code backing this article is available on GitHub. Once you're logged in as a Baeldung Pro Member, start learning and coding on the project.
