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java.util.ConcurrentModificationException: 	at java.util.HashMap$HashIterator.nextNode(HashMap.java:1429)	at java.util.HashMap$KeyIterator.next(HashMap.java:1453)	at org.eclipse.persistence.descriptors.ClassDescriptor.notifyReferencingDescriptorsOfIsolation(ClassDescriptor.java:3921)	at org.eclipse.persistence.descriptors.CachePolicy.postInitialize(CachePolicy.java:177)	at org.eclipse.persistence.descriptors.ClassDescriptor.postInitialize(ClassDescriptor.java:3909)	at org.eclipse.persistence.internal.sessions.AbstractSession.updateTablePerTenantDescriptors(AbstractSession.java:1401)	at org.eclipse.persistence.sessions.server.ClientSession.(ClientSession.java:136)	at org.eclipse.persistence.internal.sessions.IsolatedClientSession.(IsolatedClientSession.java:38)	at org.eclipse.persistence.sessions.server.ServerSession.acquireClientSession(ServerSession.java:386)	at org.eclipse.persistence.internal.jpa.EntityManagerImpl.getActivePersistenceContext(EntityManagerImpl.java:1933)	at org.eclipse.persistence.internal.jpa.EntityManagerImpl.getActiveSession(EntityManagerImpl.java:1232)	at org.eclipse.persistence.internal.jpa.EntityManagerImpl.getActiveSessionIfExists(EntityManagerImpl.java:1247)	at org.eclipse.persistence.internal.jpa.EJBQueryImpl.(EJBQueryImpl.java:102)	at org.eclipse.persistence.internal.jpa.EJBQueryImpl.(EJBQueryImpl.java:86)	at org.eclipse.persistence.internal.jpa.EntityManagerImpl.createQuery(EntityManagerImpl.java:1603)	at com.sun.enterprise.container.common.impl.EntityManagerWrapper.createQuery(EntityManagerWrapper.java:456)	at myservice.service.LinkEntityManager.createQuery(LinkEntityManager.java:165)	at myservice.service.base.BaseRepository.getList(BaseRepository.java:73)	at myservice.service.filestorage.FileStorageRepository.getStorages(FileStorageRepository.java:39)	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:483)	at org.glassfish.ejb.security.application.EJBSecurityManager.runMethod(EJBSecurityManager.java:1081)	at org.glassfish.ejb.security.application.EJBSecurityManager.invoke(EJBSecurityManager.java:1153)	at com.sun.ejb.containers.BaseContainer.invokeBeanMethod(BaseContainer.java:4786)	at com.sun.ejb.EjbInvocation.invokeBeanMethod(EjbInvocation.java:656)	at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:822)	at com.sun.ejb.EjbInvocation.proceed(EjbInvocation.java:608)	at myservice.service.log.LogInterceptor.classInterceptor(LogInterceptor.java:101)	at sun.reflect.GeneratedMethodAccessor94.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:483)	at com.sun.ejb.containers.interceptors.AroundInvokeInterceptor.intercept(InterceptorManager.java:883)	at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:822)	at com.sun.ejb.EjbInvocation.proceed(EjbInvocation.java:608)	at myservice.service.log.ContextInterceptor.classInterceptor(ContextInterceptor.java:43)	at sun.reflect.GeneratedMethodAccessor93.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:483)	at com.sun.ejb.containers.interceptors.AroundInvokeInterceptor.intercept(InterceptorManager.java:883)	at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:822)	at com.sun.ejb.EjbInvocation.proceed(EjbInvocation.java:608)	at myservice.interceptor.ServiceRegionalizeInterceptor.intercept(ServiceRegionalizeInterceptor.java:60)	at sun.reflect.GeneratedMethodAccessor92.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:483)	at com.sun.ejb.containers.interceptors.AroundInvokeInterceptor.intercept(InterceptorManager.java:883)	at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:822)	at com.sun.ejb.EjbInvocation.proceed(EjbInvocation.java:608)	at org.jboss.weld.ejb.AbstractEJBRequestScopeActivationInterceptor.aroundInvoke(AbstractEJBRequestScopeActivationInterceptor.java:46)	at org.jboss.weld.ejb.SessionBeanInterceptor.aroundInvoke(SessionBeanInterceptor.java:52)	at sun.reflect.GeneratedMethodAccessor91.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:483)	at com.sun.ejb.containers.interceptors.AroundInvokeInterceptor.intercept(InterceptorManager.java:883)	at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:822)	at com.sun.ejb.EjbInvocation.proceed(EjbInvocation.java:608)	at com.sun.ejb.containers.interceptors.SystemInterceptorProxy.doCall(SystemInterceptorProxy.java:163)	at com.sun.ejb.containers.interceptors.SystemInterceptorProxy.aroundInvoke(SystemInterceptorProxy.java:140)	at sun.reflect.GeneratedMethodAccessor90.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:483)	at com.sun.ejb.containers.interceptors.AroundInvokeInterceptor.intercept(InterceptorManager.java:883)	at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:822)	at com.sun.ejb.containers.interceptors.InterceptorManager.intercept(InterceptorManager.java:369)	at com.sun.ejb.containers.BaseContainer.__intercept(BaseContainer.java:4758)	at com.sun.ejb.containers.BaseContainer.intercept(BaseContainer.java:4746)	at com.sun.ejb.containers.EJBLocalObjectInvocationHandler.invoke(EJBLocalObjectInvocationHandler.java:212)	at com.sun.ejb.containers.EJBLocalObjectInvocationHandlerDelegate.invoke(EJBLocalObjectInvocationHandlerDelegate.java:88)	at com.sun.proxy.$Proxy246.getStorages(Unknown Source)	at myservice.service.filestorage.__EJB31_Generated__FileStorageRepository__Intf____Bean__.getStorages(Unknown Source)	at myservice.service.filestorage.FileStorageService.getFile(FileStorageService.java:175)	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:483)	at org.glassfish.ejb.security.application.EJBSecurityManager.runMethod(EJBSecurityManager.java:1081)	at org.glassfish.ejb.security.application.EJBSecurityManager.invoke(EJBSecurityManager.java:1153)	at com.sun.ejb.containers.BaseContainer.invokeBeanMethod(BaseContainer.java:4786)	at com.sun.ejb.EjbInvocation.invokeBeanMethod(EjbInvocation.java:656)	at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:822)	at com.sun.ejb.EjbInvocation.proceed(EjbInvocation.java:608)	at myservice.service.log.LogInterceptor.classInterceptor(LogInterceptor.java:101)	at sun.reflect.GeneratedMethodAccessor94.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:483)	at com.sun.ejb.containers.interceptors.AroundInvokeInterceptor.intercept(InterceptorManager.java:883)	at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:822)	at com.sun.ejb.EjbInvocation.proceed(EjbInvocation.java:608)	at myservice.service.log.ContextInterceptor.classInterceptor(ContextInterceptor.java:43)	at sun.reflect.GeneratedMethodAccessor93.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:483)	at com.sun.ejb.containers.interceptors.AroundInvokeInterceptor.intercept(InterceptorManager.java:883)	at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:822)	at com.sun.ejb.EjbInvocation.proceed(EjbInvocation.java:608)	at myservice.interceptor.ServiceRegionalizeInterceptor.intercept(ServiceRegionalizeInterceptor.java:60)	at sun.reflect.GeneratedMethodAccessor92.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:483)	at com.sun.ejb.containers.interceptors.AroundInvokeInterceptor.intercept(InterceptorManager.java:883)	at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:822)	at com.sun.ejb.EjbInvocation.proceed(EjbInvocation.java:608)	at org.jboss.weld.ejb.AbstractEJBRequestScopeActivationInterceptor.aroundInvoke(AbstractEJBRequestScopeActivationInterceptor.java:46)	at org.jboss.weld.ejb.SessionBeanInterceptor.aroundInvoke(SessionBeanInterceptor.java:52)	at sun.reflect.GeneratedMethodAccessor91.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:483)	at com.sun.ejb.containers.interceptors.AroundInvokeInterceptor.intercept(InterceptorManager.java:883)	at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:822)	at com.sun.ejb.EjbInvocation.proceed(EjbInvocation.java:608)	at com.sun.ejb.containers.interceptors.SystemInterceptorProxy.doCall(SystemInterceptorProxy.java:163)	at com.sun.ejb.containers.interceptors.SystemInterceptorProxy.aroundInvoke(SystemInterceptorProxy.java:140)	at sun.reflect.GeneratedMethodAccessor90.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:483)	at com.sun.ejb.containers.interceptors.AroundInvokeInterceptor.intercept(InterceptorManager.java:883)	at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:822)	at com.sun.ejb.containers.interceptors.InterceptorManager.intercept(InterceptorManager.java:369)	at com.sun.ejb.containers.BaseContainer.__intercept(BaseContainer.java:4758)	at com.sun.ejb.containers.BaseContainer.intercept(BaseContainer.java:4746)	at com.sun.ejb.containers.EJBLocalObjectInvocationHandler.invoke(EJBLocalObjectInvocationHandler.java:212)	at com.sun.ejb.containers.EJBLocalObjectInvocationHandlerDelegate.invoke(EJBLocalObjectInvocationHandlerDelegate.java:88)	at com.sun.proxy.$Proxy351.getFile(Unknown Source)	at myservice.service.filestorage.__EJB31_Generated__FileStorageService__Intf____Bean__.getFile(Unknown Source)	at myservice.control.imagegallery.ImageGalleryServlet.processRequest(ImageGalleryServlet.java:50)	at myservice.control.imagegallery.ImageGalleryServlet.doGet(ImageGalleryServlet.java:111)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:687)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)	at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1682)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:344)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214)	at myservice.servlet.TenantFilter.doFilter(TenantFilter.java:62)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214)	at myservice.servlet.NavigationHistoryFilter.doFilter(NavigationHistoryFilter.java:73)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:316)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:160)	at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:734)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:673)	at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:99)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:174)	at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:734)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:673)	at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:412)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:282)	at com.sun.enterprise.v3.services.impl.ContainerMapper$HttpHandlerCallable.call(ContainerMapper.java:459)	at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:167)	at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:201)	at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:175)	at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:235)	at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:119)	at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:284)	at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:201)	at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:133)	at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:112)	at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77)	at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:561)	at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:112)	at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:117)	at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:56)	at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:137)	at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:565)	at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:545)	at java.lang.Thread.run(Thread.java:745)