ClassCastException: ApplicationStartedEvent cannot be cast to ApplicationEnvironmentPreparedEvent

[TadahTech]

Ran into a weird issue with Spring Boot, and I'm not sure what's causing it.

Gist of the error: https://gist.github.com/TadahTech/fa28e407c1ad473d2a9cd5341fae9bdc

Pom's can be found here: https://gist.github.com/TadahTech/0bfe87b52d942b98649c89628980d0e6

The project layout is as follows:

Central core system Server Side implementation Client side implementation

Both client side and server side are maven modules of the parent.

I've been trying to solve this for hours, with no luck. I've attempted to remove all dependencies from the pom's other than boot, but still the same error. Any ideas?

[wilkinsona]

The Spring 2.5.6 dependency in your pom looks suspicious to me. Does the failure still occur without it? If it does, can you please provide a small example that reproduces the class cast exception?

[TadahTech]

I since removed the 2.5.6 dependency, the updated pom is here: https://gist.github.com/TadahTech/844db042b19a1ed4337f94a431605d53 (as per the Spring starting guide, I attempted to see if there was an issue in my dependencies)
The main class is this: https://gist.github.com/TadahTech/77e17c3a800f50c44c33e76bd27d282b
EDIT:
Yes, it still fails, I forgot to answer that.

[TadahTech]

Just attempted another test, with a completely empty class, short of the main and spring application running of that same class. The issue still happened.

[wilkinsona]

Sorry, but piecing things together from gists and comments isn't an efficient way to diagnose a problem. If you'd like us to spend some time trying to help you then please, as I asked above, provide a small sample that reproduces the class cast exception.

[wilkinsona]

Actually, I've just noticed that you also posted this on Stack Overflow: http://stackoverflow.com/questions/43167684/sprint-boot-classcastexception. That's a better place for this problem