Wait for process to exit when stopping DevTools integration test apps

spring-boot-integration-tests/spring-boot-devtools-tests/src/test/java/org/springframework/boot/devtools/tests/DevToolsIntegrationTests.java

@@ -78,7 +78,7 @@ public class DevToolsIntegrationTests {
 	}
 
 	@After
-	public void stopApplication() {
+	public void stopApplication() throws InterruptedException {
 		this.launchedApplication.stop();
 	}
 

spring-boot-integration-tests/spring-boot-devtools-tests/src/test/java/org/springframework/boot/devtools/tests/LaunchedApplication.java

@@ -37,9 +37,10 @@ class LaunchedApplication {
 		this.processes = processes;
 	}
 
-	void stop() {
+	void stop() throws InterruptedException {
 		for (Process process : this.processes) {
 			process.destroy();
+			process.waitFor();
 		}
 	}