remove dependency: spring-session

as long as we don't use authentication (with eg. spring-security) we won't need a session for REST services.

pom.xml

@@ -37,10 +37,6 @@
 			<groupId>org.springframework.boot</groupId>
 			<artifactId>spring-boot-starter-jdbc</artifactId>
 		</dependency>
-		<dependency>
-			<groupId>org.springframework.session</groupId>
-			<artifactId>spring-session</artifactId>
-		</dependency>
 		<dependency>
 			<groupId>org.springframework.boot</groupId>
 			<artifactId>spring-boot-starter-web</artifactId>

src/main/resources/application.properties

@@ -2,6 +2,5 @@ spring.datasource.url=jdbc:mysql://localhost:3306/memorybox?useUnicode=yes&c
 spring.datasource.username=memory
 spring.datasource.password=memory
 
-spring.jpa.hibernate.ddl-auto=create-drop
+spring.jpa.hibernate.ddl-auto=create
 
-spring.session.store-type=jdbc