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Upgraded to Spring Boot 4.0.0, Spring Cloud 2025.1.0, and Java 25
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‎04.docker/01-step-by-step-changes/readme.md‎

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@@ -199,21 +199,50 @@ Have a little bit of patience. Wait for 5-10 minutes if you do not see traces!
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### Additional Changes For Spring Boot 3+
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pom.xml
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```xml
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<!-- Enables tracing of REST API calls made using Feign-->
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<dependency>
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<groupId>io.github.openfeign</groupId>
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<artifactId>feign-micrometer</artifactId>
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</dependency>
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```
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<!-- Enables tracing of REST API calls made using Feign-->
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<dependency>
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<groupId>io.github.openfeign</groupId>
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<artifactId>feign-micrometer</artifactId>
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</dependency>
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> Starting with **Spring Boot 4**, the recommended way to call external APIs is to use **RestClient**, as **RestTemplate** is planned for deprecation.
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Reference Link: https://spring.io/blog/2025/09/30/the-state-of-http-clients-in-spring#the-future-of-http-clients-in-spring
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To use **RestClient**, you need to add the **HTTP Client** starter in `start.spring.io`.
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Follow these steps:
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1. Open **start.spring.io**
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2. Click **Add Dependencies**
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3. Type `client` in the search box
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4. Select **HTTP Client** from the list
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```xml
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-restclient</artifactId>
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</dependency>
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```
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CurrencyConversionController.java
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```
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// Enable for Spring Boot 3.0.x
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//@Configuration(proxyBeanMethods = false)
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//class RestTemplateConfiguration {
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//
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// @Bean
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// RestTemplate restTemplate(RestTemplateBuilder builder) {
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// return builder.build();
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// }
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//}
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@Configuration(proxyBeanMethods = false)
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class RestTemplateConfiguration {
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class RestClientConfiguration {
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@Bean
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RestTemplate restTemplate(RestTemplateBuilder builder) {
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RestClient restClient(RestClient.Builder builder) {
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return builder.build();
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}
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}
@@ -224,8 +253,12 @@ public class CurrencyConversionController {
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@Autowired
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private CurrencyExchangeProxy proxy;
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@Autowired
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private RestTemplate restTemplate;
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// Uncomment for Spring Boot 3.0.x
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// @Autowired
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// private RestTemplate restTemplate;
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@Autowired
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private RestClient restClient;
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```
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‎04.docker/api-gateway/pom.xml‎

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@@ -5,7 +5,7 @@
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<parent>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-parent</artifactId>
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<version>3.5.0</version>
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<version>4.0.0</version>
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<relativePath/> <!-- lookup parent from repository -->
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</parent>
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<groupId>com.in28minutes.microservices</groupId>
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<description>Demo project for Spring Boot</description>
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<properties>
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<java.version>21</java.version>
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<spring-cloud.version>2025.0.0</spring-cloud.version>
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<java.version>25</java.version>
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<spring-cloud.version>2025.1.0</spring-cloud.version>
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</properties>
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<dependencies>
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<artifactId>opentelemetry-exporter-zipkin</artifactId>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-devtools</artifactId>
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<scope>runtime</scope>
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<optional>true</optional>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-actuator-test</artifactId>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-test</artifactId>
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</plugins>
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</build>
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<repositories>
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<repository>
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<id>spring-milestones</id>
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<name>Spring Milestones</name>
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<url>https://repo.spring.io/milestone</url>
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</repository>
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</repositories>
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</project>

‎04.docker/currency-conversion-service/pom.xml‎

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@@ -5,7 +5,7 @@
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<parent>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-parent</artifactId>
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<version>3.5.0</version>
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<version>4.0.0</version>
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<relativePath/> <!-- lookup parent from repository -->
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</parent>
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<groupId>com.in28minutes.microservices</groupId>
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<description>Demo project for Spring Boot</description>
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<properties>
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<java.version>21</java.version>
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<spring-cloud.version>2025.0.0</spring-cloud.version>
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<java.version>25</java.version>
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<spring-cloud.version>2025.1.0</spring-cloud.version>
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</properties>
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<dependencies>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-web</artifactId>
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<artifactId>spring-boot-starter-webmvc</artifactId>
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</dependency>
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<!-- <dependency>
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<groupId>org.springframework.cloud</groupId>
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<scope>runtime</scope>
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<optional>true</optional>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-test</artifactId>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-actuator-test</artifactId>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-webmvc-test</artifactId>
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<scope>test</scope>
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</dependency>
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</dependencies>
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<dependencyManagement>
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</plugins>
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</build>
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<repositories>
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<repository>
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<id>spring-milestones</id>
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<name>Spring Milestones</name>
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<url>https://repo.spring.io/milestone</url>
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</repository>
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</repositories>
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</project>

‎04.docker/currency-conversion-service/src/main/java/com/in28minutes/microservices/currencyconversionservice/CurrencyConversionController.java‎

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@@ -13,11 +13,21 @@
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import org.springframework.web.bind.annotation.RestController;
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import org.springframework.web.client.RestTemplate;
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// Enable for Spring Boot 3.0.x
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//@Configuration(proxyBeanMethods = false)
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//class RestTemplateConfiguration {
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//
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// @Bean
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// RestTemplate restTemplate(RestTemplateBuilder builder) {
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// return builder.build();
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// }
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//}
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@Configuration(proxyBeanMethods = false)
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class RestTemplateConfiguration {
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class RestClientConfiguration {
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@Bean
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RestTemplate restTemplate(RestTemplateBuilder builder) {
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RestClient restClient(RestClient.Builder builder) {
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return builder.build();
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}
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}
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@Autowired
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private CurrencyExchangeProxy proxy;
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@Autowired
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private RestTemplate restTemplate;
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// Uncomment for Spring Boot 3.0.x
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// @Autowired
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// private RestTemplate restTemplate;
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@Autowired
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private RestClient restClient;
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@GetMapping("/currency-conversion/from/{from}/to/{to}/quantity/{quantity}")
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public CurrencyConversion calculateCurrencyConversion(
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HashMap<String, String> uriVariables = new HashMap<>();
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uriVariables.put("from",from);
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uriVariables.put("to",to);
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ResponseEntity<CurrencyConversion> responseEntity = restTemplate.getForEntity
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("http://localhost:8000/currency-exchange/from/{from}/to/{to}",
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CurrencyConversion.class, uriVariables);
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CurrencyConversion currencyConversion = responseEntity.getBody();
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return new CurrencyConversion(currencyConversion.getId(),
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from, to, quantity,
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currencyConversion.getConversionMultiple(),
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quantity.multiply(currencyConversion.getConversionMultiple()),
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currencyConversion.getEnvironment()+ " " + "rest template");
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// ResponseEntity<CurrencyConversion> responseEntity = restTemplate.getForEntity
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// ("http://localhost:8000/currency-exchange/from/{from}/to/{to}",
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// CurrencyConversion.class, uriVariables);
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CurrencyConversion currencyConversion = restClient.get()
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.uri("http://localhost:8000/currency-exchange/from/{from}/to/{to}", uriVariables)
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.retrieve()
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.body(CurrencyConversion.class);
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// CurrencyConversion currencyConversion = responseEntity.getBody();
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return new CurrencyConversion(currencyConversion.getId(),
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from, to, quantity,
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currencyConversion.getConversionMultiple(),
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quantity.multiply(currencyConversion.getConversionMultiple()),
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currencyConversion.getEnvironment()+ " " + "rest client");
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}
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‎04.docker/currency-exchange-service/pom.xml‎

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<parent>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-parent</artifactId>
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<version>3.5.0</version>
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<version>4.0.0</version>
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<relativePath/> <!-- lookup parent from repository -->
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</parent>
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<groupId>com.in28minutes.microservices</groupId>
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<description>Demo project for Spring Boot</description>
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<properties>
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<java.version>21</java.version>
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<spring-cloud.version>2025.0.0</spring-cloud.version>
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<java.version>25</java.version>
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<spring-cloud.version>2025.1.0</spring-cloud.version>
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</properties>
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<dependencies>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-web</artifactId>
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<artifactId>spring-boot-starter-webmvc</artifactId>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<scope>runtime</scope>
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<optional>true</optional>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-test</artifactId>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-actuator-test</artifactId>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-webmvc-test</artifactId>
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<scope>test</scope>
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</dependency>
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<dependencyManagement>
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</plugins>
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</build>
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<repositories>
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<repository>
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<id>spring-milestones</id>
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<name>Spring Milestones</name>
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<url>https://repo.spring.io/milestone</url>
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</repository>
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</repositories>
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</project>

‎04.docker/naming-server/pom.xml‎

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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-parent</artifactId>
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<version>3.5.0</version>
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<version>4.0.0</version>
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<relativePath/> <!-- lookup parent from repository -->
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</parent>
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<groupId>com.in28minutes.microservices</groupId>
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<description>Demo project for Spring Boot</description>
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<properties>
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<java.version>21</java.version>
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<spring-cloud.version>2025.0.0</spring-cloud.version>
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<java.version>25</java.version>
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<spring-cloud.version>2025.1.0</spring-cloud.version>
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</properties>
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<dependencies>
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</plugins>
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</build>
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<repositories>
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<repository>
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<id>spring-milestones</id>
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<name>Spring Milestones</name>
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<url>https://repo.spring.io/milestone</url>
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</repository>
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</repositories>
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</project>

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