Re: FOUND IT, Re: WEIRD PROBLEMS, Re: Front-ending Java for RPG -- Anybody here familiar with it besides Scott?

On 2/13/2013 4:26 PM, James H. H. Lampert wrote:

Would anybody happen to know whether or not it's OK to change the order
of the DeleteLocalRef calls (i.e., do "stmt" before "rs")? This would
allow me to avoid having two identical IF statements, but I fear it
might also create a hidden flaw that might not show up in tests. If I
can help it, I'd rather not send out a product with a memory leak (or
worse)!

Nice sleuthing!

I am a Java dabbler, at best. However, it seems to me that
DeleteLocalRef has been superseded by PushLocalFrame and PopLocalFrame.
http://docs.oracle.com/javase/1.5.0/docs/guide/jni/spec/functions.html#global_local These are implemented in JDBCR4 as jdbc_begin_object_group and jdbc_end_object_group.

However, the 7.1 documentation still refers to DeleteLocalRef.
http://publib.boulder.ibm.com/infocenter/iseries/v7r1m0/index.jsp?topic=%2Frzasc%2Fsc092507243.htm
The example on the next page shows the use of BeginObjectGroup,
reserving FreeLocalRef for the temporary object created during the
attempt to get the JNI environment pointer.

I have no canonical reference as to whether it matters if we delete the
statement reference in a different order to the result set reference.
Intuition tells me it won't matter because we aren't trying to refer to
anything in FreeResults - we're marking them eligible for garbage
collection.

I don't have any production code and thus no anecdotal evidence either.
--buck