EmbeddedMongoAutoConfiguration.determineVersion(…) fails with NPE when no features are configured and spring.mongodb.embedded.version specifies a version not included in de.flapdoodle.embed.mongo.distribution.Version

[mp911de]

Affected Spring Boot versions: 2.1.x (2.1.0.RELEASE and 2.1.1.BUILD-SNAPSHOT)

Steps to reproduce:

1. Create empty Spring Boot project and add spring-boot-starter-data-mongodb and de.flapdoodle.embed.mongo (test) dependencies
2. Add application.properties configuring spring.mongodb.embedded.version (e.g. spring.mongodb.embedded.version=3.4.1)
3. Start application

Caused by: java.lang.NullPointerException: null
	at org.springframework.boot.autoconfigure.mongo.embedded.EmbeddedMongoAutoConfiguration.determineVersion(EmbeddedMongoAutoConfiguration.java:162) ~[spring-boot-autoconfigure-2.1.1.BUILD-20181127.152604-52.jar:2.1.1.BUILD-SNAPSHOT]
	at org.springframework.boot.autoconfigure.mongo.embedded.EmbeddedMongoAutoConfiguration.embeddedMongoConfiguration(EmbeddedMongoAutoConfiguration.java:130) ~[spring-boot-autoconfigure-2.1.1.BUILD-20181127.152604-52.jar:2.1.1.BUILD-SNAPSHOT]
	at org.springframework.boot.autoconfigure.mongo.embedded.EmbeddedMongoAutoConfiguration$$EnhancerBySpringCGLIB$$d5560118.CGLIB$embeddedMongoConfiguration$1(<generated>) ~[spring-boot-autoconfigure-2.1.1.BUILD-20181127.152604-52.jar:2.1.1.BUILD-SNAPSHOT]
	at org.springframework.boot.autoconfigure.mongo.embedded.EmbeddedMongoAutoConfiguration$$EnhancerBySpringCGLIB$$d5560118$$FastClassBySpringCGLIB$$7f400318.invoke(<generated>) ~[spring-boot-autoconfigure-2.1.1.BUILD-20181127.152604-52.jar:2.1.1.BUILD-SNAPSHOT]

Gist to reproduce: https://gist.github.com/mp911de/d4d40ebd5560bea3c9bf68806be3e68c

[wilkinsona]

Thank you, @mp911de. Looks like a regression introduced in 1a8f519.