Upgrade to Gradle 9.3.0 and migrate smoke tests from Spring Boot to Shadow plugin

[Copilot]

Spring Boot 2.x plugin incompatible with Gradle 9 (LenientConfiguration.getFiles() removed). Spring Boot 3.x requires Java 17+, incompatible with Java 8 smoke test containers.

Changes

Gradle version

• Wrapper: 8.14.3 → 9.3.0
• protobuf-gradle-plugin: 0.8.19 → 0.9.6 (Gradle 9 compatibility)

Smoke test JAR packaging (ai.smoke-test-jar.gradle.kts)

Replaced Spring Boot plugin with Shadow plugin:

tasks.named<ShadowJar>("shadowJar") {
  archiveClassifier.set("")
  mergeServiceFiles()
  
  // PropertiesFileTransformer merges duplicate keys into single comma-separated values
  // Critical for Spring Boot auto-configuration (EnableAutoConfiguration key)
  transform(PropertiesFileTransformer::class.java) {
    paths = listOf("META-INF/spring.factories")
    mergeStrategy = "append"
  }
  
  manifest {
    attributes["Main-Class"] = project.findProperty("mainClassName") 
      ?: "com.microsoft.applicationinsights.smoketestapp.SpringBootApp"
  }
}

// Prevent jar task from overwriting shadowJar output
tasks.named<Jar>("jar") {
  enabled = false
}

App-specific fixes

• JettyNativeHandler, ReadOnly: Custom main classes via ext.set("mainClassName", "...")
• DiagnosticExtension: MockExtension → compileOnly (prevents classloader conflict when loaded separately as agent extension)
• NonDaemonThreads: Added spring-boot-loader dependency (TestController locates JAR via JarLauncher class), exception handling for network failures

Technical details

Shadow's append() concatenates files, creating duplicate property keys. Spring Boot reads only first occurrence:

# Before (broken)
org.springframework.boot.autoconfigure.EnableAutoConfiguration=ActuatorConfigs...
org.springframework.boot.autoconfigure.EnableAutoConfiguration=WebMvcConfigs...  # ignored!

# After (fixed)
org.springframework.boot.autoconfigure.EnableAutoConfiguration=ActuatorConfigs...,WebMvcConfigs...

Without merged auto-configuration, critical beans like ServletWebServerFactory and WebMvcMetricsAutoConfiguration aren't registered, causing startup and Micrometer failures.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• www.bing.com
  • Triggering command: /opt/java/openjdk/bin/java java -javaagent:/applicationinsights-agent.jar -jar /NonDaemonThreads-3.7.7-SNAPSHOT.jar okhttp3 (dns block)
  • Triggering command: /opt/java/openjdk/bin/java java -javaagent:/applicationinsights-agent.jar -jar /NonDaemonThreads-3.7.7-SNAPSHOT.jar okhttp3 c1c93a3e44035f56cbfc1a2eaa9723c62cf52156d2b8f0d94a6/config.json (dns block)
  • Triggering command: /opt/java/openjdk/bin/java java -javaagent:/applicationinsights-agent.jar -jar /NonDaemonThreads-3.7.7-SNAPSHOT.jar okhttp3 ACCEPT y es ntime.v2.task/mobash (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

Upgrade the project to Gradle 9

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