afs commented on issue #2584:
URL: https://github.com/apache/jena/issues/2584#issuecomment-2243009944
OK - I think I've found the problem.
It seems that there are lots of threads. `.end()` is failing to release a
lock - the lock is re-entrant so this only goes wrong when a many threads are
created. If the threads are from a pool, the lock is used as a re-entrant lock
and the system limit isn't reached.
Could you please try:
```java
dataset.begin(TxnType.READ);
try {
// Execute query
dataset.commit();
// return result
} finally {
dataset.end();
}
```
to confirm this analysis.
FYI: There is support for this pattern --
```
result = dataset.calculateRead(()->1);
```
will achieve the same (albeit boxed if a primitive type).
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