Mapping Oracle datatypes to java datatypes

I have an Oracle Stored Function written in java.  The function returns an ArrayList.  I used the following to publish the function:

 FUNCTION pull_comments (p_spn           NUMBER) RETURN comments_type
 AS LANGUAGE JAVA
 NAME 'CommentTest.getAllCommentsForSPN(long) return java.util.ArrayList';

Note: comments_type is a REF CURSOR of a tailored RECORD_TYPE.

When I execute the function I receive the following error message:
ORA-00932: inconsistent datatypes: expected OUT Conversion failed

Can you recommend another datatype mapping?
bjgardnerAsked:
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Tommy BraasConnect With a Mentor Commented:
java.util.Vector
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