Add spring-boot-microservices-project: config server, Eureka, gateway and three services on Boot 4.1.1 + Spring Cloud 2025.1.3

Product, order and inventory services behind Spring Cloud Gateway (WebMVC), configuration from a Config Server, discovery with Eureka, a Resilience4j circuit breaker on order -> inventory and Brave tracing. Run as six plain jars; output/ holds real transcripts (config, registry, requests, trace propagation, circuit breaker, startup race and the load-balanced RestClient.Builder trap). Dockerfile and docker-compose.yml are included but were not run. Co-Authored-By: Claude Sonnet 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_01HhW8LD8r3EigoBaCGrQZx5
2026-10-21 17:08:42 +00:00
commit def73fa1c4
49 changed files with 1419 additions and 0 deletions
@@ -0,0 +1,47 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+  <parent>
+    <groupId>com.ankurm.shop</groupId>
+    <artifactId>shop</artifactId>
+    <version>1.0.0</version>
+  </parent>
+  <artifactId>product-service</artifactId>
+
+  <dependencies>
+    <dependency>
+      <groupId>org.springframework.boot</groupId>
+      <artifactId>spring-boot-starter-webmvc</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>org.springframework.boot</groupId>
+      <artifactId>spring-boot-starter-actuator</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>org.springframework.cloud</groupId>
+      <artifactId>spring-cloud-starter-config</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>org.springframework.cloud</groupId>
+      <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>org.springframework.boot</groupId>
+      <artifactId>spring-boot-micrometer-tracing-brave</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>io.micrometer</groupId>
+      <artifactId>micrometer-tracing-bridge-brave</artifactId>
+    </dependency>
+  </dependencies>
+
+  <build>
+    <plugins>
+      <plugin>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-maven-plugin</artifactId>
+      </plugin>
+    </plugins>
+  </build>
+</project>
@@ -0,0 +1,6 @@
+package com.ankurm.shop.product;
+
+import java.math.BigDecimal;
+
+public record Product(long id, String name, BigDecimal price) {
+}
@@ -0,0 +1,38 @@
+package com.ankurm.shop.product;
+
+import java.math.BigDecimal;
+import java.util.List;
+import java.util.Map;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.http.HttpStatus;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.server.ResponseStatusException;
+
+@RestController
+class ProductController {
+    private static final Logger log = LoggerFactory.getLogger(ProductController.class);
+
+    private final Map<Long, Product> products = Map.of(
+            1L, new Product(1, "Mechanical keyboard", new BigDecimal("89.90")),
+            2L, new Product(2, "USB-C dock", new BigDecimal("129.00")),
+            3L, new Product(3, "27-inch monitor", new BigDecimal("249.50")));
+
+    @GetMapping("/products")
+    List<Product> all() {
+        log.info("listing {} products", products.size());
+        return products.values().stream().sorted((a, b) -> Long.compare(a.id(), b.id())).toList();
+    }
+
+    @GetMapping("/products/{id}")
+    Product one(@PathVariable long id) {
+        log.info("looking up product {}", id);
+        Product p = products.get(id);
+        if (p == null) {
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND, "Product " + id + " not found");
+        }
+        return p;
+    }
+}
@@ -0,0 +1,11 @@
+package com.ankurm.shop.product;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class ProductServiceApplication {
+    public static void main(String[] args) {
+        SpringApplication.run(ProductServiceApplication.class, args);
+    }
+}
@@ -0,0 +1,16 @@
+spring:
+  application:
+    name: product-service
+  config:
+    # Fail fast if the config server is not up: a service with the wrong config is worse than no service.
+    import: "configserver:${CONFIG_URL:http://localhost:8888}"
+server:
+  port: 8081
+eureka:
+  client:
+    service-url:
+      defaultZone: ${EUREKA_URL:http://localhost:8761/eureka}
+  instance:
+    hostname: ${EUREKA_HOSTNAME:localhost}
+    # Register the service name + port as the instance id so two copies of one service do not collide.
+    instance-id: ${spring.application.name}:${server.port}