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java.lang.NullPointerException: 	at java.util.Date.getMillisOf(Date.java:939)	at java.util.Date.compareTo(Date.java:959)	at org.obiba.magma.type.DateTimeType.compare(DateTimeType.java:117)	at org.obiba.magma.type.DateTimeType.compare(DateTimeType.java:12)	at org.obiba.magma.Value.compareTo(Value.java:101)	at org.obiba.magma.views.View$1.getLastUpdate(View.java:156)	at org.obiba.opal.web.TimestampedResponses.evaluate(TimestampedResponses.java:30)	at org.obiba.opal.web.magma.TableResource.getVariables(TableResource.java:74)	at sun.reflect.GeneratedMethodAccessor102.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at org.jboss.resteasy.core.ResourceLocator.createResource(ResourceLocator.java:64)	at org.jboss.resteasy.core.ResourceLocator.invoke(ResourceLocator.java:105)	at org.jboss.resteasy.core.ResourceLocator.invokeOnTargetObject(ResourceLocator.java:146)	at org.jboss.resteasy.core.ResourceLocator.invoke(ResourceLocator.java:91)	at org.jboss.resteasy.core.SynchronousDispatcher.getResponse(SynchronousDispatcher.java:503)	at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:480)	at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:119)	at org.jboss.resteasy.plugins.server.servlet.ServletContainerDispatcher.service(ServletContainerDispatcher.java:207)	at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:55)	at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:50)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)	at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:538)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1352)	at org.obiba.opal.server.httpd.OpalJettyServer$TransactionFilter$1.doInTransactionWithoutResult(OpalJettyServer.java:241)	at org.springframework.transaction.support.TransactionCallbackWithoutResult.doInTransaction(TransactionCallbackWithoutResult.java:33)	at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:130)	at org.obiba.opal.server.httpd.OpalJettyServer$TransactionFilter.doFilterInternal(OpalJettyServer.java:237)	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1323)	at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:83)	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1323)	at org.obiba.opal.server.httpd.security.AuthenticationFilter.doFilterInternal(AuthenticationFilter.java:69)	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1323)	at org.obiba.opal.server.httpd.OpalJettyServer$OpalVersionFilter.doFilterInternal(OpalJettyServer.java:222)	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1323)	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:474)	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:934)	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:404)	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:869)	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:117)	at org.eclipse.jetty.server.handler.HandlerList.handle(HandlerList.java:47)	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:114)	at org.eclipse.jetty.server.Server.handle(Server.java:341)	at org.eclipse.jetty.server.HttpConnection.handleRequest(HttpConnection.java:589)	at org.eclipse.jetty.server.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:1048)	at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:601)	at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:214)	at org.eclipse.jetty.server.HttpConnection.handle(HttpConnection.java:411)	at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:515)	at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:40)	at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:529)	at java.lang.Thread.run(Thread.java:662)