xcode, javac, and 101 errors

Hello all,

 I have a rather large (to me) java project that I've been working on
for a few years. Lately, the xcode java environment is generating
spurious errors which are not real. Whatever is causing the problem,
it can be reset by doing a Clean/Build. After I do that, I get 1 - 10
normal builds, before the problem reappears, and I have to revert to
Clean/Build.

target of build is a java application

environment:
Version 3.1.2 (Xcode IDE: 1149.0, Xcode Core: 1148.0, ToolSupport: 1102.0)
Mac OS X 10.5.6
MacBook 2.4 C2D, 4GB ram, ~90 GB free HD space, no VMware/BootCamp,
lots of free ram.

project:
~200 physical project files (.java and .properties)
~500 class definitions
~58k lines of java code

This problem has only occurred in the last month or so, and seems to
be getting more frequent (not to mention frustrating). The spurious
errors are all (AFAICT) "Cannot find symbol".

Anyone have any ideas or thoughts on how to resolve this ?

TIA, Ray Sanders
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