Re: java.lang.Error: Maximum lock count exceeded

Mon, 17 Jul 2023 03:29:52 -0700 

Could you describe how you are using the database?
The stacktrace is consistent with application code not ending a read transaction. 

    Andy

On 16/07/2023 21:55, Jean-Marc Vanel wrote:

It is Jena 4.8.0 .

Jean-Marc Vanel
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Le dim. 16 juil. 2023 à 21:53, Andy Seaborne <[email protected]> a écrit :


https://github.com/apache/jena/issues/1499

Are you are using 4.6.0?

      Andy

On 16/07/2023 14:54, Jean-Marc Vanel wrote:

Every few weeks, I get this stack, and the database is unusable

afterwards.

Is there some "purge" to call now and then ?

java.lang.Error: Maximum lock count exceeded
          at


java.base/java.util.concurrent.locks.ReentrantReadWriteLock$Sync.fullTryAcquireShared(ReentrantReadWriteLock.java:535)

          at


java.base/java.util.concurrent.locks.ReentrantReadWriteLock$Sync.tryAcquireShared(ReentrantReadWriteLock.java:494)

          at


java.base/java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireShared(AbstractQueuedSynchronizer.java:1323)

          at


java.base/java.util.concurrent.locks.ReentrantReadWriteLock$ReadLock.lock(ReentrantReadWriteLock.java:738)

          at


org.apache.jena.dboe.storage.system.DatasetGraphTxnCtl.beginMultiMode(DatasetGraphTxnCtl.java:334)

          at


org.apache.jena.dboe.storage.system.DatasetGraphTxnCtl.tryNonExclusiveMode(DatasetGraphTxnCtl.java:252)

          at


org.apache.jena.dboe.storage.system.DatasetGraphTxnCtl.enterTransaction(DatasetGraphTxnCtl.java:110)

          at


org.apache.jena.dboe.storage.system.DatasetGraphTxnCtl.begin(DatasetGraphTxnCtl.java:74)

          at


org.apache.jena.dboe.storage.system.DatasetGraphTxnCtl.begin(DatasetGraphTxnCtl.java:99)

          at
org.apache.jena.sparql.core.DatasetImpl.begin(DatasetImpl.java:120)

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