Improve Java9 compatibility

This commit workarounds a bug in Surefire, see
https://issues.apache.org/jira/browse/SUREFIRE-1424

It also adds `javax.xml.bind` as it is no longer provided by default
with Java9

See gh-7226

Author: snicoll

spring-boot-parent/pom.xml

@@ -923,5 +923,22 @@
 				</plugins>
 			</build>
 		</profile>
+		<profile>
+			<id>java9</id>
+			<activation>
+				<jdk>9</jdk>
+			</activation>
+			<build>
+				<plugins>
+					<plugin>
+						<groupId>org.apache.maven.plugins</groupId>
+						<artifactId>maven-surefire-plugin</artifactId>
+						<configuration>
+							<argLine>--add-modules java.base,java.xml.bind</argLine>
+						</configuration>
+					</plugin>
+				</plugins>
+			</build>
+		</profile>
 	</profiles>
 </project>