test against the earliest supported spring version

Author: zeitlinger

instrumentation/spring/spring-boot-autoconfigure/build.gradle.kts

@@ -7,7 +7,7 @@ base.archivesName.set("opentelemetry-spring-boot")
 group = "io.opentelemetry.instrumentation"
 
 val versions: Map<String, String> by project
-val springBootVersion = "2.7.18"
+val springBootVersion = "2.6.15"
 
 // r2dbc-proxy is shadowed to prevent org.springframework.boot.autoconfigure.r2dbc.R2dbcAutoConfiguration
 // from being loaded by Spring Boot (by the presence of META-INF/services/io.r2dbc.spi.ConnectionFactoryProvider) - even if the user doesn't want to use R2DBC.

instrumentation/spring/spring-webmvc/spring-webmvc-5.3/library/build.gradle.kts

@@ -3,7 +3,7 @@ plugins {
 }
 
 val versions: Map<String, String> by project
-val springBootVersion = "2.7.18"
+val springBootVersion = "2.6.15"
 
 dependencies {
   compileOnly("org.springframework:spring-webmvc:5.3.0")

instrumentation/spring/starters/spring-boot-starter/build.gradle.kts

@@ -6,7 +6,7 @@ plugins {
 group = "io.opentelemetry.instrumentation"
 
 val versions: Map<String, String> by project
-val springBootVersion = "2.7.18"
+val springBootVersion = "2.6.15"
 
 dependencies {
   compileOnly("org.springframework.boot:spring-boot-starter:$springBootVersion")

instrumentation/spring/starters/zipkin-spring-boot-starter/build.gradle.kts

@@ -6,7 +6,7 @@ plugins {
 group = "io.opentelemetry.instrumentation"
 
 val versions: Map<String, String> by project
-val springBootVersion = "2.7.18"
+val springBootVersion = "2.6.15"
 
 dependencies {
   api("org.springframework.boot:spring-boot-starter:$springBootVersion")

smoke-tests-otel-starter/spring-boot-common/build.gradle.kts

@@ -2,7 +2,7 @@ import org.springframework.boot.gradle.tasks.bundling.BootJar
 
 plugins {
   id("otel.java-conventions")
-  id("org.springframework.boot") version "2.7.18"
+  id("org.springframework.boot") version "2.6.15"
 }
 
 description = "smoke-tests-otel-starter-spring-boot-common"

smoke-tests-otel-starter/spring-boot-reactive-common/build.gradle.kts

@@ -2,7 +2,7 @@ import org.springframework.boot.gradle.tasks.bundling.BootJar
 
 plugins {
   id("otel.java-conventions")
-  id("org.springframework.boot") version "2.7.18"
+  id("org.springframework.boot") version "2.6.15"
 }
 
 description = "smoke-tests-otel-starter-spring-boot-reactive-common"

smoke-tests-otel-starter/spring-smoke-testing/build.gradle.kts

@@ -2,7 +2,7 @@ import org.springframework.boot.gradle.tasks.bundling.BootJar
 
 plugins {
   id("otel.java-conventions")
-  id("org.springframework.boot") version "2.7.18"
+  id("org.springframework.boot") version "2.6.15"
 }
 
 description = "smoke-tests-otel-starter-spring-smoke-testing"

smoke-tests/images/spring-boot/build.gradle.kts

@@ -5,12 +5,12 @@ plugins {
   id("otel.java-conventions")
 
   id("com.google.cloud.tools.jib")
-  id("org.springframework.boot") version "2.7.18"
+  id("org.springframework.boot") version "2.6.15"
 }
 
 dependencies {
   implementation(platform("io.opentelemetry:opentelemetry-bom:1.0.0"))
-  implementation(platform("org.springframework.boot:spring-boot-dependencies:2.7.18"))
+  implementation(platform("org.springframework.boot:spring-boot-dependencies:2.6.15"))
 
   implementation("io.opentelemetry:opentelemetry-api")
   implementation(project(":instrumentation-annotations"))