More frequent StardogException "There is no session with id ..."

[Håvard Ottestad]

Hi,

I'm getting this exception more frequently in our tests that run against an embedded stardog (in-memory). Anything to worry about?

org.openrdf.repository.RepositoryException: com.complexible.stardog.StardogException: There is no session with id [74b877d8-1c07-48b6-8056-170697b24a4c]

        at com.complexible.stardog.sesame.StardogRepositoryConnection.begin(StardogRepositoryConnection.java:148)

        at no.difi.einnsyn.stardog.StardogService.uploadAndReplace(StardogService.java:507)

        at no.difi.einnsyn.stardog.StardogService.uploadOntology(StardogService.java:502)

        at no.difi.einnsyn.stardog.StardogService.populateWithInitialData(StardogService.java:159)

        at no.difi.einnsyn.stardog.AbstractStardogServiceTest.createDatabase(AbstractStardogServiceTest.java:139)

        at no.difi.einnsyn.stardog.AbstractStardogServiceTest.setUp(AbstractStardogServiceTest.java:92)

        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

        at java.lang.reflect.Method.invoke(Method.java:498)

        at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)

        at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)

        at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)

        at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:24)

        at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)

        at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)

        at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)

        at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)

        at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)

        at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)

        at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)

        at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)

        at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)

        at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)

        at org.junit.runners.ParentRunner.run(ParentRunner.java:363)

        at org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:252)

        at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:141)

        at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:112)

        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

        at java.lang.reflect.Method.invoke(Method.java:498)

        at org.apache.maven.surefire.util.ReflectionUtils.invokeMethodWithArray(ReflectionUtils.java:189)

        at org.apache.maven.surefire.booter.ProviderFactory$ProviderProxy.invoke(ProviderFactory.java:165)

        at org.apache.maven.surefire.booter.ProviderFactory.invokeProvider(ProviderFactory.java:85)

        at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:115)

        at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:75)

Caused by: com.complexible.stardog.StardogException: There is no session with id [74b877d8-1c07-48b6-8056-170697b24a4c]

        at com.complexible.stardog.protocols.client.SPECClientUtil.toStardogException(SPECClientUtil.java:86)

        at com.complexible.stardog.protocols.client.SPECClientUtil.toStardogException(SPECClientUtil.java:34)

        at com.complexible.stardog.api.impl.SPECConnection._begin(SPECConnection.java:236)

        at com.complexible.stardog.api.impl.AbstractConnection.begin(AbstractConnection.java:165)

        at com.complexible.stardog.api.impl.DelegatingConnection.begin(DelegatingConnection.java:95)

        at com.complexible.stardog.api.impl.DelegatingConnection.begin(DelegatingConnection.java:95)

        at com.complexible.stardog.sesame.StardogRepositoryConnection.begin(StardogRepositoryConnection.java:140)

        ... 36 more

Caused by: com.complexible.common.protocols.client.ClientException: There is no session with id [74b877d8-1c07-48b6-8056-170697b24a4c]

        at com.complexible.common.protocols.client.rpc.DefaultRPCClient.get(DefaultRPCClient.java:278)

        at com.complexible.common.protocols.client.rpc.DefaultRPCClient.execute(DefaultRPCClient.java:254)

        at com.complexible.stardog.protocols.snarl.client.AbstractSNARLClient.begin(AbstractSNARLClient.java:384)

        at com.complexible.stardog.protocols.snarl.client.AbstractSNARLClient.begin(AbstractSNARLClient.java:61)

        at com.complexible.stardog.api.impl.SPECConnection._begin(SPECConnection.java:233)

        ... 40 more

Caused by: org.apache.shiro.session.UnknownSessionException: There is no session with id [74b877d8-1c07-48b6-8056-170697b24a4c]

        at org.apache.shiro.session.mgt.eis.AbstractSessionDAO.readSession(AbstractSessionDAO.java:170)

        at org.apache.shiro.session.mgt.DefaultSessionManager.retrieveSessionFromDataSource(DefaultSessionManager.java:236)

        at org.apache.shiro.session.mgt.DefaultSessionManager.retrieveSession(DefaultSessionManager.java:222)

        at org.apache.shiro.session.mgt.AbstractValidatingSessionManager.doGetSession(AbstractValidatingSessionManager.java:118)

        at org.apache.shiro.session.mgt.AbstractNativeSessionManager.lookupSession(AbstractNativeSessionManager.java:108)

        at org.apache.shiro.session.mgt.AbstractNativeSessionManager.lookupRequiredSession(AbstractNativeSessionManager.java:112)

        at org.apache.shiro.session.mgt.AbstractNativeSessionManager.getAttribute(AbstractNativeSessionManager.java:209)

        at org.apache.shiro.session.mgt.DelegatingSession.getAttribute(DelegatingSession.java:141)

        at org.apache.shiro.session.ProxiedSession.getAttribute(ProxiedSession.java:121)

        at org.apache.shiro.session.ProxiedSession.getAttribute(ProxiedSession.java:121)

        at org.apache.shiro.subject.support.DelegatingSubject.getRunAsPrincipalsStack(DelegatingSubject.java:469)

        at org.apache.shiro.subject.support.DelegatingSubject.getPrincipals(DelegatingSubject.java:153)

        at org.apache.shiro.mgt.DefaultSecurityManager.logout(DefaultSecurityManager.java:547)

        at org.apache.shiro.subject.support.DelegatingSubject.logout(DelegatingSubject.java:363)

        at com.complexible.stardog.StardogKernel.logout(StardogKernel.java:1742)

        at com.complexible.stardog.StardogKernel.lambda$getConnection$0(StardogKernel.java:822)

        at com.complexible.stardog.db.DatabaseImpl$DBConnectionWrapper.close(DatabaseImpl.java:1553)

        at com.complexible.stardog.StardogKernel.finishConnection(StardogKernel.java:756)

        at com.complexible.stardog.StardogKernel.access$400(StardogKernel.java:211)

        at com.complexible.stardog.StardogKernel$KernelDbConnection.close(StardogKernel.java:2740)

        at com.complexible.stardog.db.DelegatingDatabaseConnection.close(DelegatingDatabaseConnection.java:154)

        at com.complexible.stardog.StardogKernel$NotifyingDatabaseConnection.close(StardogKernel.java:3018)

        at com.complexible.stardog.protocols.server.KernelServerFunction.closeAndLogout(KernelServerFunction.java:110)

        at com.complexible.stardog.protocols.server.SPECServerFunction.close(SPECServerFunction.java:222)

        at com.complexible.stardog.protocols.server.SPECServerFunction.rollbackTx(SPECServerFunction.java:419)

        at com.complexible.stardog.protocols.server.SPECServerFunction.handleMessage(SPECServerFunction.java:164)

        at com.complexible.common.protocols.server.rpc.ServerHandler.lambda$handleMessage$1(ServerHandler.java:336)

        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)

        at java.util.concurrent.FutureTask.run(FutureTask.java:266)

        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)

        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)

        at java.lang.Thread.run(Thread.java:745)

[Michael Grove]

What's your test case doing that you're seeing these exceptions?

Cheers,

Mike

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[Håvard Ottestad]

public void uploadAndReplace(InputStream data, IRI namedGraph, RDFFormat format) throws IOException {
    try (RepositoryConnection connection = repository.getConnection()) {
        connection.begin();
        connection.clear(namedGraph);
        connection.add(data, "", format, namedGraph);
        connection.commit();
    }
}

Just clearing a graph, then uploading a stream of data into that same graph. That's essentially it. Most of the time it works, sometimes I get the exception above. The exception is on connection.begin().

Before every test we have an @Before method which drops the database, recreates it. I'm thinking maybe this is the problem, since I don't reconnect the repository after I do that.

[Michael Grove]

At a glance, it seems like maybe it's a connection management problem somewhere. We have similar code in our test suite for the Sesame integration, but we're not seeing these type of messages. We're creating a new `StardogRepository` for each test around a common `ConnectionConfiguration`.

Cheers,

Mike