With 1.9 moving into a bug fixing phase I decided to try to load a backup of my 1.8.7 world in the latest snapshot. While doing this I have been getting repeated (over 20) crashes from a ClassCastException: "ahw cannot be cast to ahn", and the Stacktrace is basically gibberish to me. I have included the crash reports that had different entities being ticked when the crash occurred. They were a Witch, Villager and an Enderman; although the majority of the crashes were a Villager. I don't know if it is related but I will mention that in all cases the entity being ticked had a NullPointerException under its "Entity's Vehicle:" section. I hope this gets resolved otherwise I'll have to start a new world and lose all I've made if I want to play with 1.9 features. 😞
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For the future: search for the class names - if the issue is popular you'll probably get at least one hit.
Ah, sorry about that duplicate. Looks like the search didn't pick up the other issues because they are all one word ("java.lang.ClassCastException:") and were all linked to various other possible causes. Glad to see that people know about this and that a fix is in the next version. Thanks!