aliariff opened a new issue, #2318:
URL: https://github.com/apache/jena/issues/2318
### Version
4.10.0
### What happened?
We got NullPointerException when there is some concurrent access to the
dataset. One accesses tries to shut down/close the dataset, while the other
still tries to open it.
### Relevant output and stacktrace
```shell
java.lang.NullPointerException: Cannot enter synchronized block because
"this.coordinatorLock" is null
at
org.apache.jena.dboe.transaction.txn.TransactionCoordinator.begin$(TransactionCoordinator.java:635)
at
org.apache.jena.dboe.transaction.txn.TransactionCoordinator.begin(TransactionCoordinator.java:627)
at
org.apache.jena.dboe.transaction.txn.TransactionCoordinator.begin(TransactionCoordinator.java:599)
at
org.apache.jena.dboe.transaction.txn.TransactionalBase.begin(TransactionalBase.java:110)
at
org.apache.jena.dboe.storage.system.DatasetGraphStorage.begin(DatasetGraphStorage.java:68)
at
org.apache.jena.sparql.core.DatasetGraphWrapper.begin(DatasetGraphWrapper.java:261)
at
org.apache.jena.dboe.storage.system.DatasetGraphTxnCtl.begin(DatasetGraphTxnCtl.java:75)
at org.apache.jena.sparql.core.DatasetImpl.begin(DatasetImpl.java:114)
(The rest are our internal code)
...............
...............
...............
```
### Are you interested in making a pull request?
Maybe
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