NoSuchFieldError but the field is there

I just upgraded a library, and another one started throwing NoSuchFieldError. It would be fine, if the field was removed. But it stays. It's just deprecated.

Hibernate.TIMESTAMP.nullSafeGet(null, null); // << works

new PersistentDateTime().nullSafeGet(null, null); // << throws NoSuchFieldError

where the the nullSafeGet method has:

Hibernate.TIMESTAMP.nullSafeGet(resultSet, string); 

(of course, the field that is not found is TIMESTAMP)

the correct version of the library is on the classpath (otherewise my manual test would not have worked as well开发者_如何学Go)

Why is that happening?

Update: I made a new class, overriding the old one, and defining the same method, with the exactly same code, and it works now. Any idea what's supposed to be happening in the bytecode?

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Joshua Bloch explained this in his short presentation - static final fields are copied into the client library, so it should be recompiled when a constant changes.

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The only thing I can think of is that PersistentDateTime() returns an instance of some class that was compiled against a different version of Hibernate.