add main class

spring-5-security/pom.xml

@@ -66,6 +66,10 @@
             <plugin>
                 <groupId>org.springframework.boot</groupId>
                 <artifactId>spring-boot-maven-plugin</artifactId>
+				<configuration>
+					<mainClass>com.baeldung.passwordstorage.PasswordStorageApplication</mainClass>
+					<layout>JAR</layout>
+				</configuration>
             </plugin>
 
             <plugin>