Update samples to use @SpringBootApplication

Update the relevant samples to use the new @SpringBootApplication
annotation.

Closes gh-1842

spring-boot-samples/spring-boot-sample-data-mongodb/src/main/java/sample/data/mongo/SampleMongoApplication.java

@@ -19,13 +19,9 @@ package sample.data.mongo;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.CommandLineRunner;
 import org.springframework.boot.SpringApplication;
-import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
-import org.springframework.context.annotation.ComponentScan;
-import org.springframework.context.annotation.Configuration;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
 
-@Configuration
-@EnableAutoConfiguration
-@ComponentScan
+@SpringBootApplication
 public class SampleMongoApplication implements CommandLineRunner {
 
 	@Autowired
@@ -34,16 +30,16 @@ public class SampleMongoApplication implements CommandLineRunner {
 	@Override
 	public void run(String... args) throws Exception {
 
-		repository.deleteAll();
+		this.repository.deleteAll();
 
 		// save a couple of customers
-		repository.save(new Customer("Alice", "Smith"));
-		repository.save(new Customer("Bob", "Smith"));
+		this.repository.save(new Customer("Alice", "Smith"));
+		this.repository.save(new Customer("Bob", "Smith"));
 
 		// fetch all customers
 		System.out.println("Customers found with findAll():");
 		System.out.println("-------------------------------");
-		for (Customer customer : repository.findAll()) {
+		for (Customer customer : this.repository.findAll()) {
 			System.out.println(customer);
 		}
 		System.out.println();
@@ -51,11 +47,11 @@ public class SampleMongoApplication implements CommandLineRunner {
 		// fetch an individual customer
 		System.out.println("Customer found with findByFirstName('Alice'):");
 		System.out.println("--------------------------------");
-		System.out.println(repository.findByFirstName("Alice"));
+		System.out.println(this.repository.findByFirstName("Alice"));
 
 		System.out.println("Customers found with findByLastName('Smith'):");
 		System.out.println("--------------------------------");
-		for (Customer customer : repository.findByLastName("Smith")) {
+		for (Customer customer : this.repository.findByLastName("Smith")) {
 			System.out.println(customer);
 		}