I don't recall why JPython has jarray instead of array -- how do they differ? I think it's a shame that similar functionality is embodied in different APIs.
The jarray module is a paper thin factory for the PyArray type which is primary (I believe) a wrapper around any existing java array instance. It exists to make arrays returned from java code useful for jpython. Since a PyArray must always wrap the original java array, it cannot resize the array.
In contrast an array instance would own the memory and can resize it as necessary.
Due to the different purposes I agree with Jim's decision of making the two module incompatible. And they are truly incompatible. jarray.array have reversed the (typecode, seq) arguments.
OTOH creating a mostly compatible array module for jpython should not be too hard.