materialized view using java stored procedure

We have a process that currently calls a java stored procedure to convert and validate a column.  Rather than call this procedure many times over for the same row we want to convert/validate once and store the result in a materialized view(mv).

We normally execute the java stored procedure as show below;

exec osrecode.Osre_Java_Utils.Pseudoesnutil(Meid_To_Hex(esn)) However to create a mv view I must somehow get the above exec into a select statement and so far I have had no luck.  Any ideas?

TIA