Fix compiler warnings and polish

Fix various compiler warnings and apply a little polish.

spring-boot-project/spring-boot-test/src/test/java/org/springframework/boot/test/web/client/TestRestTemplateContextCustomizerWithFactoryBeanTests.java

@@ -29,6 +29,8 @@ import org.springframework.context.annotation.Configuration;
 import org.springframework.test.annotation.DirtiesContext;
 import org.springframework.test.context.junit4.SpringRunner;
 
+import static org.assertj.core.api.Assertions.assertThat;
+
 /**
  * Integration tests for {@link TestRestTemplateContextCustomizer} to ensure
  * early-initialization of factory beans doesn't occur.
@@ -47,6 +49,7 @@ public class TestRestTemplateContextCustomizerWithFactoryBeanTests {
 
 	@Test
 	public void test() {
+		assertThat(this.restTemplate).isNotNull();
 	}
 
 	@Configuration

spring-boot-project/spring-boot-test/src/test/java/org/springframework/boot/test/web/client/scan/SimpleFactoryBean.java

@@ -21,9 +21,13 @@ import org.springframework.context.ApplicationContext;
 import org.springframework.stereotype.Component;
 
 /**
+ * A simple factory bean with no generics. Used to test early initialization doesn't
+ * occur.
+ *
  * @author Madhura Bhave
  */
 @Component
+@SuppressWarnings("rawtypes")
 public class SimpleFactoryBean implements FactoryBean {
 
 	private static boolean isInitializedEarly = false;
@@ -40,10 +44,12 @@ public class SimpleFactoryBean implements FactoryBean {
 		}
 	}
 
+	@Override
 	public Object getObject() {
 		return new Object();
 	}
 
+	@Override
 	public Class<?> getObjectType() {
 		return Object.class;
 	}