hibernate: exclude entitymanager from spring-boot data-jpa

this breaks stuff with hibernate 5.2
(though somehow didn't when I first tested it?!)

pom.xml

@@ -34,6 +34,12 @@
 		<dependency>
 			<groupId>org.springframework.boot</groupId>
 			<artifactId>spring-boot-starter-data-jpa</artifactId>
+			<exclusions>
+				<exclusion>
+					<groupId>org.hibernate</groupId>
+					<artifactId>hibernate-entitymanager</artifactId>
+				</exclusion>
+			</exclusions>
 		</dependency>
 		<dependency>
 			<groupId>org.springframework.boot</groupId>