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It has occurred several times in running junit tests. See attached log.
Created attachment 56072 [details] junit test log
The BaseOptions_getCodeTemplateExpandKey looks suspicious. Yarda also reported some problems around that area, see issue #126369.
Fixed together with issue #126369. Please check that the deadlock has really gone. I tried running javadoc tests on my laptop and they all passed.
Verified, tests pass now