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java.lang.NullPointerException: 	at org.dspace.core.AbstractHibernateDAO.getHibernateSession(AbstractHibernateDAO.java:48)	at org.dspace.core.AbstractHibernateDAO.create(AbstractHibernateDAO.java:38)	at org.dspace.app.util.WebAppServiceImpl.create(WebAppServiceImpl.java:49)	at org.dspace.app.util.AbstractDSpaceWebapp.register(AbstractDSpaceWebapp.java:75)	at org.dspace.app.util.DSpaceWebappListener.contextInitialized(DSpaceWebappListener.java:31)	at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4797)	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5221)	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1408)	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1398)	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)