OALL8 is in an inconsistent state

Just had an exception due to this error when executing a database query to oracle using hibernate, all of a sudden – this has never happened before.
“The internet” implies this problem is probably caused by different Oracle versions, driver incompatibilities or likewise. As I have not changed anything about my database recently, this was not the case for me.

By debugging the code line by line and evaluating different expressions while doing so, I found out that the real problem was the odd heap space error, when retrieving a large result list from a hibernate query.

Increased memory for my app using -Xmx1024M, this did the trick. Not sure why no meaningful exception message was issued.

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