[OpenJDK 2D-Dev] JNI crashes in FontManager code

Roman Kennke roman.kennke at aicas.com
Sun Oct 19 09:36:24 UTC 2008


> Suggested changes seems reasonable.
> However, i failed to invent testcase to reproduce this issue.
> Could you please describe what google test is doing in regard to the 
> font code?
> It first glance it seems that the only way to get into freetypeScaler.c 
> is through synchronized methods and
> env variable gets overridden every time. So, it seems that it should 
> match current thread always.
> I am interested to understand what i am missing here.

I think what could happen here is that FreeType doesn't read the whole
font file in one go during initialization, but instead reads the glyphs
on demand when actually scaling. It's possible that this is triggered
from a different thread than the one used during initialization. I don't
know about Hotspot, but I know that some VMs simply don't care (so much
as others) about what JNIEnv* they use when calling a JNI function.


Dipl.-Inform. (FH) Roman Kennke, Software Engineer, http://kennke.org
aicas Allerton Interworks Computer Automated Systems GmbH
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