I'm trying to configure/use connection pool with OpenJPA and DBCP. When adding commons-dbcp:1.4 to
the classpath I get error:
"org.apache.openjpa.persistence.PersistenceException/SQLException/com.mysql.cj.exceptions.StatementIsClosedException:
No operations allowed after statement closed." and no pool, coonections being re-created constantly
and higher memory usage.
With commons-dbcp2:2.9.0 I do get constant connection pool (lsof, same ports after a couple of
tries) but James floods logs with exceptions about multithreading operation (below) and imapsync
dies shortly due to erroring out.
Is connection pooling supported? How to correctly configure it?
OpenJPA configuration
(https://openjpa.apache.org/builds/3.2.2/apache-openjpa/docs/manual.html#openjpa.jdbc.DriverDataSource)
seems to indicate, that DBCP2 should be available in the classpath, which seems to be picked up
corrently and create the pool, but there seem to be issue with James utilizing it?
----
StackTraces/logs
1:55:39.878 [WARN ] i.n.c.DefaultChannelPipeline - An exceptionCaught() event was fired, and it
reached at the tail of the pipeline. It usually means the last handler in the pipeline did not
handle the exception.
org.apache.openjpa.persistence.PersistenceException: Multiple concurrent threads attempted to access
a single broker. By default brokers are not thread safe; if you require and/or intend a broker to be
accessed by more than one thread, set the openjpa.Multithreaded property to true to override the
default behavior.
at
org.apache.openjpa.kernel.BrokerImpl.endOperation(BrokerImpl.java:2083)
at org.apache.openjpa.kernel.BrokerImpl.isActive(BrokerImpl.java:2028)
at
org.apache.openjpa.kernel.DelegatingBroker.isActive(DelegatingBroker.java:521)
at
org.apache.openjpa.persistence.EntityManagerImpl.isActive(EntityManagerImpl.java:812)
at
org.apache.openjpa.persistence.PersistenceExceptions$2.translate(PersistenceExceptions.java:82)
at
org.apache.openjpa.kernel.DelegatingBroker.translate(DelegatingBroker.java:108)
at
org.apache.openjpa.kernel.DelegatingBroker.isActive(DelegatingBroker.java:523)
at
org.apache.openjpa.persistence.EntityManagerImpl.isActive(EntityManagerImpl.java:812)
at
org.apache.james.backends.jpa.EntityManagerUtils.safelyClose(EntityManagerUtils.java:37)
at
org.apache.james.mailbox.jpa.JPATransactionalMapper.endRequest(JPATransactionalMapper.java:91)
at
org.apache.james.mailbox.store.MailboxSessionMapperFactory.endProcessingRequest(MailboxSessionMapperFactory.java:143)
at
org.apache.james.mailbox.store.StoreMailboxManager.endProcessingRequest(StoreMailboxManager.java:915)
at
org.apache.james.mailbox.MailboxManager.lambda$manageProcessing$10(MailboxManager.java:436)
at
reactor.core.publisher.MonoUsing$MonoUsingSubscriber.onComplete(MonoUsing.java:275)
at
reactor.core.publisher.Operators$MultiSubscriptionSubscriber.onComplete(Operators.java:2205)
at
reactor.core.publisher.Operators$MultiSubscriptionSubscriber.onComplete(Operators.java:2205)
at
reactor.core.publisher.FluxHide$SuppressFuseableSubscriber.onComplete(FluxHide.java:147)
at
reactor.core.publisher.MonoIgnoreElements$IgnoreElementsSubscriber.onComplete(MonoIgnoreElements.java:89)
at
reactor.core.publisher.Operators$MultiSubscriptionSubscriber.onComplete(Operators.java:2205)
at
reactor.core.publisher.Operators$MultiSubscriptionSubscriber.onComplete(Operators.java:2205)
at
reactor.core.publisher.Operators$MultiSubscriptionSubscriber.onComplete(Operators.java:2205)
at reactor.core.publisher.MonoRunnable.subscribe(MonoRunnable.java:50)
at
reactor.core.publisher.MonoDeferContextual.subscribe(MonoDeferContextual.java:55)
at reactor.core.publisher.Mono.subscribe(Mono.java:4444)
at
reactor.core.publisher.FluxOnErrorResume$ResumeSubscriber.onError(FluxOnErrorResume.java:103)
at
reactor.core.publisher.MonoFlatMap$FlatMapMain.onError(MonoFlatMap.java:180)
at
reactor.core.publisher.MonoFlatMap$FlatMapMain.onError(MonoFlatMap.java:180)
at
reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.onError(MonoIgnoreThen.java:278)
at
reactor.core.publisher.SerializedSubscriber.onError(SerializedSubscriber.java:124)
at
reactor.core.publisher.FluxRetryWhen$RetryWhenMainSubscriber.whenError(FluxRetryWhen.java:225)
at
reactor.core.publisher.FluxRetryWhen$RetryWhenOtherSubscriber.onError(FluxRetryWhen.java:274)
at
reactor.core.publisher.FluxContextWrite$ContextWriteSubscriber.onError(FluxContextWrite.java:121)
at
reactor.core.publisher.FluxConcatMapNoPrefetch$FluxConcatMapNoPrefetchSubscriber.maybeOnError(FluxConcatMapNoPrefetch.java:326)
at
reactor.core.publisher.FluxConcatMapNoPrefetch$FluxConcatMapNoPrefetchSubscriber.onNext(FluxConcatMapNoPrefetch.java:211)
at
reactor.core.publisher.FluxContextWrite$ContextWriteSubscriber.onNext(FluxContextWrite.java:107)
at
reactor.core.publisher.SinkManyEmitterProcessor.drain(SinkManyEmitterProcessor.java:471)
at
reactor.core.publisher.SinkManyEmitterProcessor$EmitterInner.drainParent(SinkManyEmitterProcessor.java:615)
at
reactor.core.publisher.FluxPublish$PubSubInner.request(FluxPublish.java:602)
at
reactor.core.publisher.FluxContextWrite$ContextWriteSubscriber.request(FluxContextWrite.java:136)
at
reactor.core.publisher.FluxConcatMapNoPrefetch$FluxConcatMapNoPrefetchSubscriber.request(FluxConcatMapNoPrefetch.java:336)
at
reactor.core.publisher.FluxContextWrite$ContextWriteSubscriber.request(FluxContextWrite.java:136)
at
reactor.core.publisher.Operators$DeferredSubscription.request(Operators.java:1717)
at
reactor.core.publisher.FluxRetryWhen$RetryWhenMainSubscriber.onError(FluxRetryWhen.java:192)
at
reactor.core.publisher.MonoFlatMap$FlatMapMain.onNext(MonoFlatMap.java:149)
at
reactor.core.publisher.MonoHasElement$HasElementSubscriber.onNext(MonoHasElement.java:72)
at
reactor.core.publisher.MonoSubscribeOn$SubscribeOnSubscriber.onNext(MonoSubscribeOn.java:146)
at
reactor.core.publisher.FluxOnErrorResume$ResumeSubscriber.onNext(FluxOnErrorResume.java:79)
at
reactor.core.publisher.FluxOnErrorResume$ResumeSubscriber.onNext(FluxOnErrorResume.java:79)
at
reactor.core.publisher.MonoCallable$MonoCallableSubscription.request(MonoCallable.java:156)
at
reactor.core.publisher.Operators$MultiSubscriptionSubscriber.set(Operators.java:2341)
at
reactor.core.publisher.FluxOnErrorResume$ResumeSubscriber.onSubscribe(FluxOnErrorResume.java:74)
at reactor.core.publisher.MonoCallable.subscribe(MonoCallable.java:48)
at reactor.core.publisher.Mono.subscribe(Mono.java:4444)
at
reactor.core.publisher.MonoSubscribeOn$SubscribeOnSubscriber.run(MonoSubscribeOn.java:126)
at reactor.core.scheduler.WorkerTask.call(WorkerTask.java:84)
at reactor.core.scheduler.WorkerTask.call(WorkerTask.java:37)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:317)
at
java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:304)
at
java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)
at
java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)
at java.base/java.lang.Thread.run(Thread.java:1623)
21:55:39.885 [ERROR] o.a.j.i.p.AbstractMailboxProcessor - Unexpected error
during IMAP processing
org.apache.openjpa.persistence.PersistenceException: Multiple concurrent threads attempted to access
a single broker. By default brokers are not thread safe; if you require and/or intend a broker to be
accessed by more than one thread, set the openjpa.Multithreaded property to true to override the
default behavior.
at
org.apache.openjpa.kernel.BrokerImpl.endOperation(BrokerImpl.java:2083)
at org.apache.openjpa.kernel.BrokerImpl.isActive(BrokerImpl.java:2028)
at
org.apache.openjpa.kernel.DelegatingBroker.isActive(DelegatingBroker.java:521)
at
org.apache.openjpa.persistence.EntityManagerImpl.isActive(EntityManagerImpl.java:812)
at
org.apache.openjpa.persistence.PersistenceExceptions$2.translate(PersistenceExceptions.java:82)
at
org.apache.openjpa.kernel.DelegatingBroker.translate(DelegatingBroker.java:108)
at
org.apache.openjpa.kernel.DelegatingBroker.isActive(DelegatingBroker.java:523)
at
org.apache.openjpa.persistence.EntityManagerImpl.isActive(EntityManagerImpl.java:812)
at
org.apache.james.mailbox.jpa.JPATransactionalMapper.rollback(JPATransactionalMapper.java:81)
at
org.apache.james.mailbox.store.transaction.TransactionalMapper.lambda$executeReactive$1(TransactionalMapper.java:52)
at
com.github.fge.lambdas.consumers.ConsumerChainer.lambda$sneakyThrow$9(ConsumerChainer.java:73)
at reactor.core.publisher.Mono.lambda$doOnError$20(Mono.java:2741)
at
reactor.core.publisher.MonoPeekTerminal$MonoTerminalPeekSubscriber.onError(MonoPeekTerminal.java:250)
at
reactor.core.publisher.MonoPeekTerminal$MonoTerminalPeekSubscriber.onError(MonoPeekTerminal.java:258)
at
reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.onError(MonoIgnoreThen.java:278)
at
reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.subscribeNext(MonoIgnoreThen.java:255)
at
reactor.core.publisher.MonoIgnoreThen.subscribe(MonoIgnoreThen.java:51)
at
reactor.core.publisher.InternalMonoOperator.subscribe(InternalMonoOperator.java:64)
at
reactor.core.publisher.MonoFlatMap$FlatMapMain.onNext(MonoFlatMap.java:165)
at
reactor.core.publisher.FluxSwitchIfEmpty$SwitchIfEmptySubscriber.onNext(FluxSwitchIfEmpty.java:74)
at reactor.core.publisher.FluxMap$MapSubscriber.onNext(FluxMap.java:122)
at
reactor.core.publisher.MonoSubscribeOn$SubscribeOnSubscriber.onNext(MonoSubscribeOn.java:146)
at
reactor.core.publisher.FluxOnErrorResume$ResumeSubscriber.onNext(FluxOnErrorResume.java:79)
at
reactor.core.publisher.FluxOnErrorResume$ResumeSubscriber.onNext(FluxOnErrorResume.java:79)
at
reactor.core.publisher.MonoCallable$MonoCallableSubscription.request(MonoCallable.java:156)
at
reactor.core.publisher.Operators$MultiSubscriptionSubscriber.set(Operators.java:2341)
at
reactor.core.publisher.FluxOnErrorResume$ResumeSubscriber.onSubscribe(FluxOnErrorResume.java:74)
at reactor.core.publisher.MonoCallable.subscribe(MonoCallable.java:48)
at reactor.core.publisher.Mono.subscribe(Mono.java:4444)
at
reactor.core.publisher.MonoSubscribeOn$SubscribeOnSubscriber.run(MonoSubscribeOn.java:126)
at reactor.core.scheduler.WorkerTask.call(WorkerTask.java:84)
at reactor.core.scheduler.WorkerTask.call(WorkerTask.java:37)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:317)
at
java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:304)
at
java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)
at
java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)
at java.base/java.lang.Thread.run(Thread.java:1623)
Suppressed: org.apache.openjpa.persistence.PersistenceException: Multiple concurrent threads
attempted to access a single broker. By default brokers are not thread safe; if you require and/or
intend a broker to be accessed by more than one thread, set the openjpa.Multithreaded property to
true to override the default behavior.
at
org.apache.openjpa.kernel.BrokerImpl.endOperation(BrokerImpl.java:2083)
at
org.apache.openjpa.kernel.BrokerImpl.isActive(BrokerImpl.java:2028)
at
org.apache.openjpa.kernel.DelegatingBroker.isActive(DelegatingBroker.java:521)
at
org.apache.openjpa.persistence.EntityManagerImpl.isActive(EntityManagerImpl.java:812)
at
org.apache.openjpa.persistence.PersistenceExceptions$2.translate(PersistenceExceptions.java:82)
at
org.apache.openjpa.kernel.DelegatingBroker.translate(DelegatingBroker.java:108)
at
org.apache.openjpa.kernel.DelegatingBroker.begin(DelegatingBroker.java:1028)
at
org.apache.openjpa.persistence.EntityManagerImpl.begin(EntityManagerImpl.java:684)
at
org.apache.james.mailbox.jpa.JPATransactionalMapper.begin(JPATransactionalMapper.java:59)
... 25 common frames omitted
Wrapped by: org.apache.james.mailbox.exception.MailboxException: Begin
of transaction failed
at
org.apache.james.mailbox.jpa.JPATransactionalMapper.begin(JPATransactionalMapper.java:61)
at
com.github.fge.lambdas.runnable.RunnableChainer.lambda$sneakyThrow$215(RunnableChainer.java:71)
at
reactor.core.publisher.MonoRunnable.call(MonoRunnable.java:73)
at
reactor.core.publisher.MonoRunnable.call(MonoRunnable.java:32)
at
reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.subscribeNext(MonoIgnoreThen.java:252)
... 21 common frames omitted
--
Wojtek
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
