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Which issue does this PR close?
Closes #49.
Rationale for this change
Comet currently use
jni-rs
0.19 which is a bit out-dated. The latest version0.21.x
provides more improvements including updated safety, better JVM handling, less data copying, etc. On the other hand, it also introduced many API changes. In the long term, we should update to0.21
+ to get continuous improvements fromjni-rs
.What changes are included in this PR?
This PR upgrades
jni-rs
from 0.19 to 0.21. There are many API changes between the two versions and hence many places need to be updated as well in the repo.Most notably, many method calls in
jni-rs
now requires a&mut JNIEnv
as parameter, while it used to be&JNIEnv
.How are these changes tested?
Existing tests.