Major Description
Hi Dan, meanwhile we are using 1.16.2 and observe still (more rarely) this exception during startup.
018-06-20 15:10:47.546 [localhost-startStop-1] init ERROR org.apache.isis.viewer.wicket.viewer.IsisWicketApplication - Failed to initialize com.google.inject.ProvisionException: Unable to provision, see the following errors: 1) Error in custom provider, java.lang.RuntimeException: An error occurred while executing code in a temporary session at org.apache.isis.core.runtime.runner.IsisInjectModule.provideIsisSessionFactory(IsisInjectModule.java:109) at org.apache.isis.core.runtime.runner.IsisInjectModule.provideIsisSessionFactory(IsisInjectModule.java:109) while locating org.apache.isis.core.runtime.system.session.IsisSessionFactory for field at org.apache.isis.viewer.wicket.viewer.IsisWicketApplication.isisSessionFactory(IsisWicketApplication.java:155) while locating at.a1ta.cll.webapp.CllWebApplication 1 error at com.google.inject.internal.Errors.throwProvisionExceptionIfErrorsExist(Errors.java:486) at com.google.inject.internal.MembersInjectorImpl.injectMembers(MembersInjectorImpl.java:67) at com.google.inject.internal.InjectorImpl.injectMembers(InjectorImpl.java:987) at org.apache.isis.viewer.wicket.viewer.IsisWicketApplication.init(IsisWicketApplication.java:368) at at.a1ta.cll.webapp.CllWebApplication.init(CllWebApplication.java:32) at org.apache.wicket.Application.initApplication(Application.java:953) at org.apache.wicket.protocol.http.WicketFilter.init(WicketFilter.java:429) at org.apache.wicket.protocol.http.WicketFilter.init(WicketFilter.java:353) at org.apache.catalina.core.ApplicationFilterConfig.initFilter(ApplicationFilterConfig.java:285) at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:266) at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:108) at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4590) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5233) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:752) at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:728) at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:734) at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:629) at org.apache.catalina.startup.HostConfig$DeployDescriptor.run(HostConfig.java:1839) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748) Caused by: java.lang.RuntimeException: An error occurred while executing code in a temporary session at org.apache.isis.core.runtime.system.session.IsisSessionFactory.doInSession(IsisSessionFactory.java:366) at org.apache.isis.core.runtime.system.session.IsisSessionFactory.doInSession(IsisSessionFactory.java:330) at org.apache.isis.core.runtime.system.session.IsisSessionFactory.doInSession(IsisSessionFactory.java:317) at org.apache.isis.core.runtime.system.session.IsisSessionFactoryBuilder.buildSessionFactory(IsisSessionFactoryBuilder.java:211) at org.apache.isis.core.runtime.runner.IsisInjectModule.provideIsisSessionFactory(IsisInjectModule.java:118) at org.apache.isis.core.runtime.runner.IsisInjectModule$$FastClassByGuice$$a813f90e.invoke(<generated>) at com.google.inject.internal.ProviderMethod$FastClassProviderMethod.doProvision(ProviderMethod.java:264) at com.google.inject.internal.ProviderMethod$Factory.provision(ProviderMethod.java:401) at com.google.inject.internal.ProviderMethod$Factory.get(ProviderMethod.java:376) at com.google.inject.internal.ProviderToInternalFactoryAdapter$1.call(ProviderToInternalFactoryAdapter.java:46) at com.google.inject.internal.InjectorImpl.callInContext(InjectorImpl.java:1092) at com.google.inject.internal.ProviderToInternalFactoryAdapter.get(ProviderToInternalFactoryAdapter.java:40) at com.google.inject.internal.SingletonScope$1.get(SingletonScope.java:194) at com.google.inject.internal.InternalFactoryToProviderAdapter.get(InternalFactoryToProviderAdapter.java:41) at com.google.inject.internal.SingleFieldInjector.inject(SingleFieldInjector.java:54) at com.google.inject.internal.MembersInjectorImpl.injectMembers(MembersInjectorImpl.java:132) at com.google.inject.internal.MembersInjectorImpl$1.call(MembersInjectorImpl.java:93) at com.google.inject.internal.MembersInjectorImpl$1.call(MembersInjectorImpl.java:80) at com.google.inject.internal.InjectorImpl.callInContext(InjectorImpl.java:1085) at com.google.inject.internal.MembersInjectorImpl.injectAndNotify(MembersInjectorImpl.java:80) at com.google.inject.internal.MembersInjectorImpl.injectMembers(MembersInjectorImpl.java:62) ... 22 more Caused by: java.util.ConcurrentModificationException at java.util.HashMap$HashIterator.nextNode(HashMap.java:1442) at java.util.HashMap$ValueIterator.next(HashMap.java:1471) at java.util.AbstractCollection.toArray(AbstractCollection.java:141) at java.util.Collections$UnmodifiableCollection.toArray(Collections.java:1033) at java.util.ArrayList.<init>(ArrayList.java:178) at com.google.common.collect.Lists.newArrayList(Lists.java:146) at org.apache.isis.core.metamodel.specloader.SpecificationLoader.allSpecifications(SpecificationLoader.java:495) at org.apache.isis.core.metamodel.specloader.validator.MetaModelValidatorVisiting.validateSpecs(MetaModelValidatorVisiting.java:71) at org.apache.isis.core.metamodel.specloader.validator.MetaModelValidatorVisiting.validateAll(MetaModelValidatorVisiting.java:58) at org.apache.isis.core.metamodel.specloader.validator.MetaModelValidatorVisiting.validate(MetaModelValidatorVisiting.java:49) at org.apache.isis.core.metamodel.specloader.validator.MetaModelValidatorComposite.validate(MetaModelValidatorComposite.java:60) at org.apache.isis.core.metamodel.specloader.SpecificationLoader.validate(SpecificationLoader.java:272) at org.apache.isis.core.metamodel.specloader.SpecificationLoader.validateAndAssert(SpecificationLoader.java:262) at org.apache.isis.core.runtime.system.session.IsisSessionFactoryBuilder$1.run(IsisSessionFactoryBuilder.java:217) at org.apache.isis.core.runtime.system.session.IsisSessionFactory$1.call(IsisSessionFactory.java:333) at org.apache.isis.core.runtime.system.session.IsisSessionFactory$1.call(IsisSessionFactory.java:330) at org.apache.isis.core.runtime.system.session.IsisSessionFactory.doInSession(IsisSessionFactory.java:364) ... 42 more 2018-06-20 15:10:47.573 [localhost-startStop-1] join INFO org.apache.isis.core.runtime.threadpool.ThreadPoolSupport - join'ing 6 tasks: waited 0 milliseconds