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From ajoo <ajoo.em...@gmail.com>
Subject NPE when using user connection and sub-select statement
Date Sat, 06 Jan 2007 16:29:57 GMT

Hi, our project uses ibatis in a slightly different way. The legacy system
uses a ConnectionManager to obtain and release connections. So I had to use

Accordiing to the javadoc, when using openSession(Connection), I need to
manage transaction myself, which I did.

IBatis works fine with queryForObject and queryForList.

The problem occurs when I have a 1+N mapping (where a select statement is
specified to get a sub-object) in the mapping file. In this case, a
NullPointerException is thrown at line 780 of SqlMapExecutorDelegate class,
which calls txManager.end(session). The stack trace also shows that this
error occurs when iBatis is trying to call queryForList() when the lazily
loaded list is evaluated.

This leads me to suspect that iBatis knows not to do transaction when the
java code calls queryForList, but when it performs a 1+N mapping, it fails
to ignore transaction, hence caused NPE.

This is just my wild guess based on the symptom.

Currently we delete the 1+N mapping from the mapping file and do it with a
Java loop. It works fine.
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