Passing numpy arrays to Java using Jpype

Question

I am trying to convert a numpy array into a Java-like array using JPype's JArray command.

values = valBD.ReadAsArray()
JArray(float, values.ndim)(values)

leads to the following error message:

JArray(float, values.ndim)(values) File "c:\Python26\lib\site-packages\jpype_jarray.py", line 125, in JArray elif issubclass(t, _jclass._JAVAOBJECT):

TypeError: issubclass() arg 2 must be a class or tuple of classes

Do you habe any suggesions? Thanks a lot, Martwig

Answer 1

JPype is expecting a list or list of lists, not a numpy array.

Try this:

values = valBD.ReadAsArray()
JArray(float, values.ndim)(values.tolist())