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java.util.ConcurrentModificationException: 	at java.util.HashMap$HashIterator.nextEntry(HashMap.java:762)	at java.util.HashMap$ValueIterator.next(HashMap.java:792)	at org.hibernate.pretty.Printer.toString(Printer.java:90)	at org.hibernate.event.def.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:91)	at org.hibernate.event.def.DefaultAutoFlushEventListener.onAutoFlush(DefaultAutoFlushEventListener.java:39)	at org.hibernate.impl.SessionImpl.autoFlushIfRequired(SessionImpl.java:711)	at org.hibernate.impl.SessionImpl.prepareQueries(SessionImpl.java:895)	at org.hibernate.impl.SessionImpl.getQueries(SessionImpl.java:885)	at org.hibernate.impl.SessionImpl.list(SessionImpl.java:834)	at org.hibernate.impl.QueryImpl.list(QueryImpl.java:74)	at org.springframework.orm.hibernate3.HibernateTemplate$29.doInHibernate(HibernateTemplate.java:751)	at org.springframework.orm.hibernate3.HibernateTemplate.execute(HibernateTemplate.java:312)	at org.springframework.orm.hibernate3.HibernateTemplate.find(HibernateTemplate.java:742)	at org.springframework.orm.hibernate3.HibernateTemplate.find(HibernateTemplate.java:734)	at eu.cec.regio.sysaudit.domain.persistence.hibernate.HibernateMissionDao.getComplements(HibernateMissionDao.java:116)	at sun.reflect.GeneratedMethodAccessor102.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:324)	at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:288)	at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:155)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:122)	at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:57)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:144)	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:174)	at $Proxy10.getComplements(Unknown Source)	at eu.cec.regio.sysaudit.web.action.mission.preparation.wizard.SaveMission$1.doInTransactionWithoutResult(SaveMission.java:62)	at org.springframework.transaction.support.TransactionCallbackWithoutResult.doInTransaction(TransactionCallbackWithoutResult.java:33)	at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:114)	at eu.cec.regio.sysaudit.web.action.mission.preparation.wizard.SaveMission.save(SaveMission.java:59)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)