Build with JDK21 and target JDK17

Author: adwsingh

.github/workflows/ci.yml

@@ -12,7 +12,7 @@ jobs:
     name: Java ${{ matrix.java }} ${{ matrix.os }}
     strategy:
       matrix:
-        java: [17]
+        java: [21]
         os: [macos-latest, ubuntu-latest]
 
     steps:

buildSrc/src/main/kotlin/smithy-java.java-conventions.gradle.kts

@@ -19,12 +19,13 @@ val Project.libs get() = the<org.gradle.accessors.dm.LibrariesForLibs>()
 
 java {
     toolchain {
-        languageVersion = JavaLanguageVersion.of(17)
+        languageVersion = JavaLanguageVersion.of(21)
     }
 }
 
 tasks.withType<JavaCompile>() {
     options.encoding = "UTF-8"
+    options.release.set(17)
 }
 
 tasks.withType<Javadoc>() {

examples/mcp-server/build.gradle.kts

@@ -60,3 +60,7 @@ tasks.assemble {
     dependsOn(tasks.shadowJar)
 }
 
+java {
+    toolchain.languageVersion.set(JavaLanguageVersion.of(21))
+}
+

mcp/mcp-cli/build.gradle.kts

@@ -54,8 +54,8 @@ tasks.processResources {
     dependsOn(generateVersionFile)
 }
 
-java {
-    toolchain.languageVersion.set(JavaLanguageVersion.of(21))
+tasks.withType<JavaCompile> {
+    options.release.set(21)
 }
 
 tasks.shadowJar {

mcp/mcp-server/build.gradle.kts

@@ -22,6 +22,12 @@ java {
     toolchain.languageVersion.set(JavaLanguageVersion.of(21))
 }
 
+tasks {
+    compileJava {
+        options.release.set(21)
+    }
+}
+
 spotbugs {
     ignoreFailures = true
 }