Add web and actuator starters

This commit also adds sleep to ApplicationListener.onApplicationEvent() to see if it's blocking application start-up.

See spring-projects/spring-framework#25074 (comment)

build.gradle

@@ -32,6 +32,8 @@ repositories {
 }
 
 dependencies {
+    implementation("org.springframework.boot:spring-boot-starter-web")
+    implementation("org.springframework.boot:spring-boot-starter-actuator")
     implementation("org.springframework.boot:spring-boot-starter-jdbc")
     implementation("com.h2database:h2")
 

src/main/java/com/izeye/throwaway/service/WarmUpApplicationListener.java

@@ -3,6 +3,7 @@
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
+import java.util.concurrent.TimeUnit;
 
 import org.springframework.boot.context.event.ApplicationStartedEvent;
 import org.springframework.context.ApplicationListener;
@@ -25,6 +26,13 @@ public WarmUpApplicationListener(TestRepository testRepository) {
 	public void onApplicationEvent(ApplicationStartedEvent event) {
 		log.info("In onApplicationEvent(): {}", event);
 
+		try {
+			TimeUnit.SECONDS.sleep(10);
+		} catch (InterruptedException ex) {
+			Thread.currentThread().interrupt();
+			throw new RuntimeException(ex);
+		}
+
 		List<String> ids = Arrays.asList("test1", "test2");
 		List<Thread> threads = new ArrayList<>();
 		ids.forEach((id) -> {