try for modify on tomcat

pom.xml

@@ -65,6 +65,7 @@
       <artifactId>spring-boot-starter-test</artifactId>
       <scope>test</scope>
     </dependency>
+   
 
     <!-- Databases - Uses HSQL by default -->
     <dependency>
@@ -115,6 +116,11 @@
       <artifactId>spring-boot-devtools</artifactId>
       <scope>runtime</scope>
     </dependency>
+    <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-tomcat</artifactId>
+            <scope>provided</scope>
+        </dependency>
   </dependencies>
 
   <build>

src/main/java/org/springframework/samples/petclinic/PetClinicApplication.java

@@ -26,10 +26,23 @@ import org.springframework.boot.autoconfigure.SpringBootApplication;
  *
  */
 @SpringBootApplication
-public class PetClinicApplication {
+public class PetClinicApplication extends SpringBootServletInitializer {
+    @Override
+    protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
+        return application.sources(Application.class);
+    }
 
     public static void main(String[] args) throws Exception {
         SpringApplication.run(PetClinicApplication.class, args);
     }
 
 }
+/**@SpringBootApplication
+*public class PetClinicApplication {
+*
+*    public static void main(String[] args) throws Exception {
+*        SpringApplication.run(PetClinicApplication.class, args);
+*    }
+*
+*}
+*/