Specify working versions of JPype1

RELEASE_NOTES.rst

@@ -28,6 +28,9 @@ All changes
   - When a :class:`.GAMSModel` is solved with an LP status of 5 (optimal, but with infeasibilities after unscaling), :class:`.JDBCBackend` would attempt to read the output GDX file and fail, leading to an uninformative error message (:issue:`98`).
     Now :class:`.ModelError` is raised describing the situation.
 - Improved type hinting for static typing of code that uses :mod:`ixmp` (:issue:`465`, :pull:`500`).
+- :mod:`ixmp` requires on JPype1 1.4.0 or earlier, for Python 3.10 and earlier (:pull:`504`).
+  With JPype1 1.4.1 and later, memory management in :class:`.CachingBackend` may not function as intended (:issue:`463`), which could lead to high memory use where many, large :class:`.Scenario` objects are created and used in a single Python program.
+  (For Python 3.11 and later, any version of JPype1 from the prior minimum (1.2.1) to the latest is supported.)
 
 .. _v3.7.0:
 

pyproject.toml

@@ -34,6 +34,7 @@ dependencies = [
   "click",
   "genno >= 1.16",
   "JPype1 >= 1.2.1",
+  "JPype1 <= 1.4.0; python_version < '3.11'",
   "openpyxl",
   "pandas >= 1.2",
   "pint",