Re: Why is this assertion being triggered?

From:
Patricia Shanahan <pats@acm.org>
Newsgroups:
comp.lang.java.programmer
Date:
Tue, 09 Jan 2007 08:30:58 GMT
Message-ID:
<6pIoh.8828$yx6.7974@newsread2.news.pas.earthlink.net>
thebad1 wrote:

Patricia Shanahan wrote:

thebad1 wrote:

no problem a second time. Also if I rerun the code again, the assertion
is triggered but with a different value of tRating.


Given those symptoms, I would look VERY closely at whatever is supposed
to synchronize accesses and updates to tRating.

It is behaving exactly like a variable that is being updated from at
least one other thread while the assertion executes, so that it is a NaN
when the test is done, but something else when it is converted to String
for concatenation.


This is what's really causing my brain to hurt, as it's just a simple
loop in a main method, there's no fun and games or threads or suchlike.

I'm not sure how significant this is; but the exact same class running
with the same params, "-Xmx758m -ea" and the same datafiles, on a
RHELinux ES 3 box with jdk-1.6.0-fcs does not hit these assertions.


Again, different behavior on different systems is very typical of
unsynchronized multi-threaded access.

Are you sure there isn't even a tiny little invokeLater :-)

How about a short, simple, self-contained example?

Patricia

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