feat(samples): Add Caffeine cache to Spring Boot sample

Enable cache tracing in the Spring Boot 2/3 sample using Caffeine
as an in-memory cache provider. No external infrastructure required.

Co-Authored-By: Claude <noreply@anthropic.com>

Author: adinauer

sentry-samples/sentry-samples-spring-boot/build.gradle.kts

@@ -50,6 +50,9 @@ dependencies {
   implementation(projects.sentryQuartz)
   implementation(projects.sentryAsyncProfiler)
 
+  // cache tracing
+  implementation("com.github.ben-manes.caffeine:caffeine")
+
   // database query tracing
   implementation(projects.sentryJdbc)
   runtimeOnly(libs.hsqldb)

sentry-samples/sentry-samples-spring-boot/src/main/java/io/sentry/samples/spring/boot/SentryDemoApplication.java

@@ -9,6 +9,7 @@
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.boot.web.client.RestTemplateBuilder;
+import org.springframework.cache.annotation.EnableCaching;
 import org.springframework.context.annotation.Bean;
 import org.springframework.scheduling.annotation.EnableScheduling;
 import org.springframework.scheduling.quartz.CronTriggerFactoryBean;
@@ -18,6 +19,7 @@
 import org.springframework.web.reactive.function.client.WebClient;
 
 @SpringBootApplication
+@EnableCaching
 @EnableScheduling
 public class SentryDemoApplication {
   public static void main(String[] args) {

sentry-samples/sentry-samples-spring-boot/src/main/resources/application.properties

@@ -20,6 +20,11 @@ sentry.profile-session-sample-rate=1.0
 sentry.profiling-traces-dir-path=tmp/sentry/profiling-traces
 sentry.profile-lifecycle=TRACE
 
+# Cache tracing
+sentry.enable-cache-tracing=true
+spring.cache.cache-names=todos
+spring.cache.caffeine.spec=maximumSize=500,expireAfterAccess=600s
+
 # Database configuration
 spring.datasource.url=jdbc:p6spy:hsqldb:mem:testdb
 spring.datasource.driver-class-name=com.p6spy.engine.spy.P6SpyDriver