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java.lang.UnsupportedOperationException: 	at java.util.Collections$UnmodifiableList.remove(Collections.java:1317)	at com.klopotek.core.session.job.SessionsHooverScheduler.changeView(SessionsHooverScheduler.java:219)	at com.klopotek.core.session.job.SessionsHooverScheduler.stopJobs(SessionsHooverScheduler.java:192)	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:497)	at org.jboss.as.ee.component.ManagedReferenceLifecycleMethodInterceptor.processInvocation(ManagedReferenceLifecycleMethodInterceptor.java:96)	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)	at org.jboss.as.weld.ejb.Jsr299BindingsInterceptor.doLifecycleInterception(Jsr299BindingsInterceptor.java:114)	at org.jboss.as.weld.ejb.Jsr299BindingsInterceptor.processInvocation(Jsr299BindingsInterceptor.java:98)	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)	at org.jboss.as.ee.component.ManagedReferenceReleaseInterceptor.processInvocation(ManagedReferenceReleaseInterceptor.java:56)	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)	at org.jboss.as.ee.component.NamespaceContextInterceptor.processInvocation(NamespaceContextInterceptor.java:50)	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)	at org.jboss.as.ejb3.tx.CMTTxInterceptor.invokeInOurTx(CMTTxInterceptor.java:275)	at org.jboss.as.ejb3.tx.CMTTxInterceptor.requiresNew(CMTTxInterceptor.java:349)	at org.jboss.as.ejb3.tx.LifecycleCMTTxInterceptor.processInvocation(LifecycleCMTTxInterceptor.java:66)	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)	at org.jboss.as.ejb3.component.interceptors.CurrentInvocationContextInterceptor.processInvocation(CurrentInvocationContextInterceptor.java:41)	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)	at org.jboss.as.ee.concurrent.ConcurrentContextInterceptor.processInvocation(ConcurrentContextInterceptor.java:45)	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)	at org.jboss.invocation.ContextClassLoaderInterceptor.processInvocation(ContextClassLoaderInterceptor.java:64)	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)	at org.jboss.invocation.InterceptorContext.run(InterceptorContext.java:356)	at org.jboss.invocation.PrivilegedWithCombinerInterceptor.processInvocation(PrivilegedWithCombinerInterceptor.java:80)	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)	at org.jboss.invocation.ChainedInterceptor.processInvocation(ChainedInterceptor.java:61)	at org.jboss.as.ee.component.BasicComponentInstance.destroy(BasicComponentInstance.java:125)	at org.jboss.as.ejb3.component.singleton.SingletonComponent.destroySingletonInstance(SingletonComponent.java:185)	at org.jboss.as.ejb3.component.singleton.SingletonComponent.done(SingletonComponent.java:142)	at org.jboss.as.ejb3.component.EJBComponent.stop(EJBComponent.java:559)	at org.jboss.as.ee.component.ComponentStartService$2.run(ComponentStartService.java:78)	at java.util.concurrent.Executors$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)	at org.jboss.threads.JBossThread.run(JBossThread.java:320)