4.0.0 JNI/reflection invocation 2/4/8 times as slow as in 3.3.3

[Jost Boekemeier]

I think I have found the problem:

The new implementation of the IdentityHashMap causes this trouble:

-        table = new Object[old.length << 1 + 2];
+        table = new Object[(old.length * 2) + 2];

Imho the new implementation is nonsense.

This hash is not a "normal" hash table with a list but it is an array
where additional entries are stored above the current entry.  The
implementation requires that empty slots appear between the
keys/tombstones, otherwise the hash degenerates to a linear search.

So old.length << 2 could be a good value, or, as the original author
decided old.length << 3.


Jost