Baeldung Pro – NPI EA (cat = Baeldung)
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Baeldung Pro comes with both absolutely No-Ads as well as finally with Dark Mode, for a clean learning experience:

>> Explore a clean Baeldung

Once the early-adopter seats are all used, the price will go up and stay at $33/year.

Partner – Microsoft – NPI EA (cat = Baeldung)
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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.

Partner – Microsoft – NPI EA (cat= Spring Boot)
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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.

Partner – Orkes – NPI EA (cat=Spring)
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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.

Partner – Orkes – NPI EA (tag=Microservices)
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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.

eBook – Guide Spring Cloud – NPI EA (cat=Spring Cloud)
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Let's get started with a Microservice Architecture with Spring Cloud:

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eBook – Mockito – NPI EA (tag = Mockito)
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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:

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eBook – Java Concurrency – NPI EA (cat=Java Concurrency)
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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:

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eBook – Reactive – NPI EA (cat=Reactive)
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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:

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eBook – Java Streams – NPI EA (cat=Java Streams)
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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:

>> Join Pro and download the eBook

eBook – Jackson – NPI EA (cat=Jackson)
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Do JSON right with Jackson

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eBook – HTTP Client – NPI EA (cat=Http Client-Side)
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Get the most out of the Apache HTTP Client

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eBook – Maven – NPI EA (cat = Maven)
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Get Started with Apache Maven:

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eBook – Persistence – NPI EA (cat=Persistence)
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Working on getting your persistence layer right with Spring?

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eBook – RwS – NPI EA (cat=Spring MVC)
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Building a REST API with Spring?

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Course – LS – NPI EA (cat=Jackson)
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Get started with Spring and Spring Boot, through the Learn Spring course:

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Course – RWSB – NPI EA (cat=REST)
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Explore Spring Boot 3 and Spring 6 in-depth through building a full REST API with the framework:

>> The New “REST With Spring Boot”

Course – LSS – NPI EA (cat=Spring Security)
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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:

>> Learn Spring Security

Course – All Access – NPI EA (cat= Spring)
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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.

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Course – LSD – NPI EA (tag=Spring Data JPA)
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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:

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Partner – LambdaTest – NPI EA (cat=Testing)
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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:

>> Automated End-to-End Testing With Playwright

Course – Spring Sale 2025 – NPI EA (cat= Baeldung)
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Yes, we're now running our Spring Sale. All Courses are 25% off until 26th May, 2025:

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eBook – Reactive – NPI(cat= Reactive)
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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:

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1. Overview

In this tutorial, we are going to show how to customize Spring’s WebClient – a reactive HTTP client – to log requests and responses.

2. WebClient

WebClient is a reactive and non-blocking interface for HTTP requests, based on Spring WebFlux. It has a functional, fluent API with reactive types for declarative composition.

Behind the scenes, WebClient calls an HTTP client. Reactor Netty is the default and reactive HttpClient of Jetty is also supported. Moreover, it’s possible to plug other implementations of HTTP client by setting up a ClientConnector for WebClient.

3. Logging Requests and Responses

The default HttpClient used by WebClient is the Netty implementation, so after we change the reactor.netty.http.client logging level to DEBUG, we can see some request logging, but if we need a customized log, we can configure our loggers via WebClient#filters:

WebClient
  .builder()
  .filters(exchangeFilterFunctions -> {
      exchangeFilterFunctions.add(logRequest());
      exchangeFilterFunctions.add(logResponse());
  })
  .build()

In this code snippet, we’ve added two separate filters to log the request and the response.

Let’s implement logRequest by using ExchangeFilterFunction#ofRequestProcessor:

ExchangeFilterFunction logRequest() {
    return ExchangeFilterFunction.ofRequestProcessor(clientRequest -> {
        if (log.isDebugEnabled()) {
            StringBuilder sb = new StringBuilder("Request: \n");
            //append clientRequest method and url
            clientRequest
              .headers()
              .forEach((name, values) -> values.forEach(value -> /* append header key/value */));
            log.debug(sb.toString());
        }
        return Mono.just(clientRequest);
    });
}

logResponse is the same, but we have to use ExchangeFilterFunction#ofResponseProcessor instead.

Now we can change the reactor.netty.http.client log level to INFO or ERROR to have a cleaner output.

4. Logging Request and Response with Body

HTTP clients have features to log the bodies of requests and responses. Thus, to achieve the goal, we are going to use a log-enabled HTTP client with our WebClient.

We can do this by manually setting WebClient.Builder#clientConnector – let’s see with Jetty and Netty HTTP clients.

4.1. Logging with Jetty HttpClient

First, let’s add the Maven dependency for jetty-reactive-httpclient to our pom:

<dependency>
    <groupId>org.eclipse.jetty</groupId>
    <artifactId>jetty-reactive-httpclient</artifactId>
    <version>1.1.6</version>
</dependency>

Then we’re going to create a customized Jetty HttpClient:

SslContextFactory.Client sslContextFactory = new SslContextFactory.Client();
HttpClient httpClient = new HttpClient(sslContextFactory) {
    @Override
    public Request newRequest(URI uri) {
        Request request = super.newRequest(uri);
        return enhance(request);
    }
};

Here, we’ve overridden HttpClient#newRequest, then wrapped the Request in a log enhancer.

Next, we need to register events with the request so that we can log as each part of the request becomes available:

Request enhance(Request request) {
    StringBuilder group = new StringBuilder();
    request.onRequestBegin(theRequest -> {
        // append request url and method to group
    });
    request.onRequestHeaders(theRequest -> {
        for (HttpField header : theRequest.getHeaders()) {
            // append request headers to group
        }
    });
    request.onRequestContent((theRequest, content) -> {
        // append content to group
    });
    request.onRequestSuccess(theRequest -> {
        log.debug(group.toString());
        group.delete(0, group.length());
    });
    group.append("\n");
    request.onResponseBegin(theResponse -> {
        // append response status to group
    });
    request.onResponseHeaders(theResponse -> {
        for (HttpField header : theResponse.getHeaders()) {
            // append response headers to group
        }
    });
    request.onResponseContent((theResponse, content) -> {
        // append content to group
    });
    request.onResponseSuccess(theResponse -> {
        log.debug(group.toString());
    });
    return request;
}

Finally, we have to build the WebClient instance:

WebClient
  .builder()
  .clientConnector(new JettyClientHttpConnector(httpClient))
  .build()

Of course, as we did before, we’ll need to set the log level of RequestLogEnhancer to DEBUG.

4.2. Logging with Netty HttpClient

First, let’s create a Netty HttpClient:

HttpClient httpClient = HttpClient
  .create()
  .wiretap(true)

Having enabled the wiretap, each request and response will be logged in full detail.

Next, we have to set the log level of Netty’s client package reactor.netty.http.client to DEBUG:

logging.level.reactor.netty.http.client=DEBUG

Now, let’s build the WebClient:

WebClient
  .builder()
  .clientConnector(new ReactorClientHttpConnector(httpClient))
  .build()

Our WebClient will log every request and response in full detail, but the default format of Netty built-in logger contains both Hex and Text representation of bodies and also a lot of data about request and response events.

So, if we need only the text logger for Netty, we can configure the HttpClient:

HttpClient httpClient = HttpClient
  .create()
  .wiretap("reactor.netty.http.client.HttpClient", 
    LogLevel.DEBUG, AdvancedByteBufFormat.TEXTUAL);

5. Conclusion

In this tutorial, we’ve used several techniques for logging request and response data while using Spring WebClient.

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.
Baeldung Pro – NPI EA (cat = Baeldung)
announcement - icon

Baeldung Pro comes with both absolutely No-Ads as well as finally with Dark Mode, for a clean learning experience:

>> Explore a clean Baeldung

Once the early-adopter seats are all used, the price will go up and stay at $33/year.

Partner – Microsoft – NPI EA (cat = Spring Boot)
announcement - icon

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.

Partner – Orkes – NPI EA (cat = Spring)
announcement - icon

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.

Partner – Orkes – NPI EA (tag = Microservices)
announcement - icon

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.

eBook – HTTP Client – NPI EA (cat=HTTP Client-Side)
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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:

>> Download the eBook

eBook – Java Concurrency – NPI EA (cat=Java Concurrency)
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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:

>> Download the eBook

eBook – Java Streams – NPI EA (cat=Java Streams)
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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:

>> Join Pro and download the eBook

eBook – Persistence – NPI EA (cat=Persistence)
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Working on getting your persistence layer right with Spring?

Explore the eBook

Course – LS – NPI EA (cat=REST)

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Get started with Spring Boot and with core Spring, through the Learn Spring course:

>> CHECK OUT THE COURSE

Course – Spring Sale 2025 – NPI EA (cat= Baeldung)
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Yes, we're now running our Spring Sale. All Courses are 25% off until 26th May, 2025:

>> EXPLORE ACCESS NOW

Course – Spring Sale 2025 – NPI (All)
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Yes, we're now running our Spring Sale. All Courses are 25% off until 26th May, 2025:

>> EXPLORE ACCESS NOW

Partner – Microsoft – NPI (cat=Spring)
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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.

eBook Jackson – NPI EA – 3 (cat = Jackson)