AtesComp opened a new issue, #1583:
URL: https://github.com/apache/jena/issues/1583
### Version
Apache Jena Fuseki 4.7.0-SNAPSHOT
### What happened?
Occasionally (and apparently randomly), a "500 Server Error" is thrown.
The queries are persistent, common queries that work immediately after a
restart, so I don't see problems with the query text.
It seems that, while the previous query reports "200 OK", a lock is not
properly released on occasion.
- A race condition issue?
- A "GET" query followed by a "POST" query?
- The "GET" query is a programmed query. The "POST" query is a Fuseki
website query (http:/\/localhost:3030/#/dataset/MyDS/query). Why would a POST
after a successful GET indicate "Already in a transaction"?
- A "POST" query followed by a "POST" query? **Needs Verification**
- These "POST" queries are all Fuseki website upload queries
(http:/\/localhost:3030/#/dataset/MyDS/upload). This is performed for initial
graph loads on a new Fuseki data store.
- This could be after a "List current graphs" query
(http:/\/localhost:3030/#/dataset/MyDS/edit), which I believe does a GET query.
Sorry there is not more to go on at the moment.
### Relevant output and stacktrace
```shell
2022-10-18 10:59:41.801 INFO [qtp1984328477-44]
[org.apache.jena.atlas.logging.FmtLog.info(FmtLog.java:85)] - [10] GET
http://localhost:3030/COLT/sparql?query=PREFIX+...
2022-10-18 10:59:41.908 INFO [qtp1984328477-44]
[org.apache.jena.atlas.logging.FmtLog.info(FmtLog.java:85)] - [10] 200 OK (105
ms)
2022-10-18 11:00:12.332 INFO [qtp1984328477-51]
[org.apache.jena.atlas.logging.FmtLog.info(FmtLog.java:85)] - [11] GET
http://localhost:3030/COLT/sparql?query=PREFIX+...
2022-10-18 11:00:12.355 INFO [qtp1984328477-51]
[org.apache.jena.atlas.logging.FmtLog.info(FmtLog.java:85)] - [11] 200 OK (22
ms)
2022-10-18 11:00:23.876 INFO [qtp1984328477-51]
[org.apache.jena.atlas.logging.FmtLog.info(FmtLog.java:85)] - [12] POST
http://localhost:3030/MyDS/query
2022-10-18 11:00:23.890 INFO [qtp1984328477-51]
[org.apache.jena.fuseki.servlets.SPARQLQueryProcessor.execute(SPARQLQueryProcessor.java:248)]
- [12] Query = PREFIX xsd: ...
2022-10-18 11:00:23.894 WARN [qtp1984328477-51]
[org.apache.jena.atlas.logging.FmtLog.warn(FmtLog.java:113)] - [12] RC = 500 :
Already in a transaction
org.apache.jena.sparql.JenaTransactionException: Already in a transaction
at
org.apache.jena.sparql.core.TransactionalLock.error(TransactionalLock.java:175)
~[fuseki-server.jar:4.7.0-SNAPSHOT]
...
at
org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:1077)
~[fuseki-server.jar:4.7.0-SNAPSHOT]
at java.lang.Thread.run(Thread.java:829) ~[?:?]
2022-10-18 11:00:23.906 INFO [qtp1984328477-51]
[org.apache.jena.atlas.logging.FmtLog.info(FmtLog.java:85)] - [12] 500 Server
Error (28 ms)
```
### Are you interested in making a pull request?
Maybe
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