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From "Robin Green" <>
Subject Possible multithreading bug in XSPJavaProcessor
Date Fri, 28 Apr 2000 22:55:06 GMT
I'm not the world's greatest expert on multithreading, but can I humbly 
suggest that there might be a lurking bug in XSPJavaProcessor?

As far as I can see, the only sychronization in Cocoon is
1) when creating the engine
2) the MemoryStore
and 3) an XSPUtil function (not relevant).

So although there is MemoryStore synchronization, there is no 
synchronization related to the .java and .class files which are created by 
XSP. So you could theoretically have one thread partway through writing a 
file, and another thread reading that file - causing a hard-to-fathom error.

So I suggest synchronizing on compile(), and load() in XSPJavaProcessor, and 
on whatever writes the .java file to disk (synchronizing on the same object 
in all three cases). It introduces a bottleneck, but we can't edit the 
compiler, so it's the best we can do.

Or have I missed something obvious?


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