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Configure a RestTemplate with RestTemplateBuilder
Last updated: April 17, 2025
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.
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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.
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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.
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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:
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.
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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.
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Spring Data JPA is a great way to handle the complexity of JPA with the powerful simplicity of Spring Boot.
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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.
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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. Introduction
In this quick tutorial, we’re going to look at how to configure a Spring RestTemplate bean.
Let’s start by discussing the three main configuration types:
- using the default RestTemplateBuilder
- using a RestTemplateCustomizer
- creating our own RestTemplateBuilder
To be able to test this easily, please follow the guide on how to set up a simple Spring Boot application.
2. Configuration Using the Default RestTemplateBuilder
To configure a RestTemplate this way, we need to inject the default RestTemplateBuilder bean provided by Spring Boot into our classes:
private RestTemplate restTemplate;
@Autowired
public HelloController(RestTemplateBuilder builder) {
this.restTemplate = builder.build();
}The RestTemplate bean created with this method has its scope limited to the class in which we build it.
3. Configuration Using a RestTemplateCustomizer
With this approach, we can create an application-wide, additive customization.
This is a slightly more complicated approach. For this we need to create a class that implements RestTemplateCustomizer, and define it as a bean:
public class CustomRestTemplateCustomizer implements RestTemplateCustomizer {
@Override
public void customize(RestTemplate restTemplate) {
restTemplate.getInterceptors().add(new CustomClientHttpRequestInterceptor());
}
}The CustomClientHttpRequestInterceptor interceptor is doing basic logging of the request:
public class CustomClientHttpRequestInterceptor implements ClientHttpRequestInterceptor {
private static Logger LOGGER = LoggerFactory
.getLogger(CustomClientHttpRequestInterceptor.class);
@Override
public ClientHttpResponse intercept(
HttpRequest request, byte[] body,
ClientHttpRequestExecution execution) throws IOException {
logRequestDetails(request);
return execution.execute(request, body);
}
private void logRequestDetails(HttpRequest request) {
LOGGER.info("Headers: {}", request.getHeaders());
LOGGER.info("Request Method: {}", request.getMethod());
LOGGER.info("Request URI: {}", request.getURI());
}
}Now, we define CustomRestTemplateCustomizer as a bean in a configuration class or in our Spring Boot application class:
@Bean
public CustomRestTemplateCustomizer customRestTemplateCustomizer() {
return new CustomRestTemplateCustomizer();
}With this configuration, every RestTemplate that we’ll use in our application will have the custom interceptor set on it.
4. Configuration by Creating Our Own RestTemplateBuilder
This is the most extreme approach to customizing a RestTemplate. It disables the default auto-configuration of RestTemplateBuilder, so we need to define it ourselves:
@Bean
@DependsOn(value = {"customRestTemplateCustomizer"})
public RestTemplateBuilder restTemplateBuilder() {
return new RestTemplateBuilder(customRestTemplateCustomizer());
}After this, we can inject the custom builder into our classes like we’d do with a default RestTemplateBuilder and create a RestTemplate as usual:
private RestTemplate restTemplate;
@Autowired
public HelloController(RestTemplateBuilder builder) {
this.restTemplate = builder.build();
}5. Conclusion
We’ve seen how to configure a RestTemplate with the default RestTemplateBuilder, building our own RestTemplateBuilder, or using a RestTemplateCustomizer bean.
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