Add explicit toolchain version to all modules

declarative-configuration/build.gradle.kts

@@ -6,6 +6,12 @@ plugins {
 description = "OpenTelemetry Example for Declarative Configuration"
 val moduleName by extra { "io.opentelemetry.examples.fileconfig" }
 
+java {
+    toolchain {
+        languageVersion.set(JavaLanguageVersion.of(8))
+    }
+}
+
 dependencies {
     implementation("io.opentelemetry:opentelemetry-api")
     implementation("io.opentelemetry:opentelemetry-sdk")

doc-snippets/api/build.gradle.kts

@@ -4,6 +4,12 @@ plugins {
 
 val moduleName by extra { "io.opentelemetry.examples.docs.configuration" }
 
+java {
+    toolchain {
+        languageVersion.set(JavaLanguageVersion.of(8))
+    }
+}
+
 dependencies {
     implementation("io.opentelemetry:opentelemetry-api")
 

doc-snippets/configuration/build.gradle.kts

@@ -4,6 +4,12 @@ plugins {
 
 val moduleName by extra { "io.opentelemetry.examples.docs.configuration" }
 
+java {
+    toolchain {
+        languageVersion.set(JavaLanguageVersion.of(11))
+    }
+}
+
 dependencies {
     implementation("io.opentelemetry:opentelemetry-sdk")
     implementation("io.opentelemetry:opentelemetry-sdk-extension-autoconfigure")

doc-snippets/exporters/build.gradle.kts

@@ -7,6 +7,12 @@ plugins {
 
 val moduleName by extra { "io.opentelemetry.examples.docs.exporters" }
 
+java {
+    toolchain {
+        languageVersion.set(JavaLanguageVersion.of(17))
+    }
+}
+
 dependencies {
     implementation(platform(SpringBootPlugin.BOM_COORDINATES))
     implementation(platform("io.opentelemetry.instrumentation:opentelemetry-instrumentation-bom:2.20.1"))

doc-snippets/getting-started/build.gradle.kts

@@ -7,6 +7,12 @@ plugins {
 
 val moduleName by extra { "io.opentelemetry.examples.docs.getting-started" }
 
+java {
+    toolchain {
+        languageVersion.set(JavaLanguageVersion.of(17))
+    }
+}
+
 dependencies {
     implementation(platform(SpringBootPlugin.BOM_COORDINATES))
     implementation(platform("io.opentelemetry.instrumentation:opentelemetry-instrumentation-bom:2.20.1"))

doc-snippets/spring-starter/build.gradle.kts

@@ -7,6 +7,12 @@ plugins {
 
 val moduleName by extra { "io.opentelemetry.examples.docs.spring-starter" }
 
+java {
+    toolchain {
+        languageVersion.set(JavaLanguageVersion.of(17))
+    }
+}
+
 dependencies {
     implementation(platform(SpringBootPlugin.BOM_COORDINATES))
     implementation(platform("io.opentelemetry.instrumentation:opentelemetry-instrumentation-bom:2.20.1"))

micrometer-shim/build.gradle.kts

@@ -7,6 +7,12 @@ plugins {
 }
 
 description = "OpenTelemetry Example for Micrometer Shim"
+
+java {
+    toolchain {
+        languageVersion.set(JavaLanguageVersion.of(17))
+    }
+}
 val moduleName by extra { "io.opentelemetry.examples.micrometer-shim" }
 
 val bootRun = tasks.named<BootRun>("bootRun") {

spring-native/build.gradle.kts

@@ -7,6 +7,12 @@ plugins {
 }
 
 description = "OpenTelemetry Example for Spring native images"
+
+java {
+    toolchain {
+        languageVersion.set(JavaLanguageVersion.of(17))
+    }
+}
 val moduleName by extra { "io.opentelemetry.examples.native" }
 
 dependencies {

telemetry-testing/build.gradle.kts

@@ -10,6 +10,12 @@ plugins {
 description = "OpenTelemetry Example for Telemetry Testing"
 val moduleName by extra { "io.opentelemetry.examples.telemetry-testing" }
 
+java {
+    toolchain {
+        languageVersion.set(JavaLanguageVersion.of(17))
+    }
+}
+
 val bootRun = tasks.named<BootRun>("bootRun") {
     mainClass = "io.opentelemetry.example.javagent.Application"
 }