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java.lang.NullPointerException: 	at java.text.SimpleDateFormat.parse(SimpleDateFormat.java:1235)	at java.text.DateFormat.parse(DateFormat.java:335)	at org.sonatype.nexus.proxy.maven.DefaultMetadataManager.getTimestampForMdTsString(DefaultMetadataManager.java:307)	at org.sonatype.nexus.proxy.maven.DefaultMetadataManager.resolveSnapshot(DefaultMetadataManager.java:277)	at org.sonatype.nexus.proxy.maven.DefaultMetadataManager.resolveArtifact(DefaultMetadataManager.java:114)	at org.sonatype.nexus.proxy.maven.ArtifactStoreHelper.resolveArtifact(ArtifactStoreHelper.java:326)	at org.sonatype.nexus.rest.artifact.ArtifactResolvePlexusResource.get(ArtifactResolvePlexusResource.java:141)	at org.sonatype.plexus.rest.resource.RestletResource.represent(RestletResource.java:246)	at org.sonatype.nexus.rest.NexusRestletResource.represent(NexusRestletResource.java:52)	at org.restlet.resource.Resource.getRepresentation(Resource.java:302)	at org.restlet.resource.Resource.handleGet(Resource.java:464)	at org.restlet.Finder.handle(Finder.java:353)	at org.restlet.Filter.doHandle(Filter.java:150)	at org.restlet.Filter.handle(Filter.java:195)	at org.restlet.Router.handle(Router.java:504)	at org.restlet.Filter.doHandle(Filter.java:150)	at org.restlet.Filter.handle(Filter.java:195)	at org.restlet.Router.handle(Router.java:504)	at org.restlet.Filter.doHandle(Filter.java:150)	at org.restlet.Filter.handle(Filter.java:195)	at org.restlet.Filter.doHandle(Filter.java:150)	at org.sonatype.plexus.rest.RetargetableRestlet.doHandle(RetargetableRestlet.java:39)	at org.restlet.Filter.handle(Filter.java:195)	at org.restlet.Filter.doHandle(Filter.java:150)	at org.restlet.Filter.handle(Filter.java:195)	at org.restlet.Filter.doHandle(Filter.java:150)	at org.restlet.Filter.handle(Filter.java:195)	at org.restlet.Filter.doHandle(Filter.java:150)	at com.noelios.restlet.StatusFilter.doHandle(StatusFilter.java:130)	at org.restlet.Filter.handle(Filter.java:195)	at org.restlet.Filter.doHandle(Filter.java:150)	at org.restlet.Filter.handle(Filter.java:195)	at com.noelios.restlet.ChainHelper.handle(ChainHelper.java:124)	at com.noelios.restlet.application.ApplicationHelper.handle(ApplicationHelper.java:112)	at org.restlet.Application.handle(Application.java:341)	at org.restlet.ext.wadl.WadlApplication.handle(WadlApplication.java:705)	at org.restlet.Filter.doHandle(Filter.java:150)	at org.restlet.Filter.handle(Filter.java:195)	at org.restlet.Router.handle(Router.java:504)	at org.restlet.Filter.doHandle(Filter.java:150)	at org.restlet.Filter.handle(Filter.java:195)	at org.restlet.Router.handle(Router.java:504)	at org.restlet.Filter.doHandle(Filter.java:150)	at org.restlet.Filter.handle(Filter.java:195)	at com.noelios.restlet.ChainHelper.handle(ChainHelper.java:124)	at org.restlet.Component.handle(Component.java:673)	at org.restlet.Server.handle(Server.java:331)	at com.noelios.restlet.ServerHelper.handle(ServerHelper.java:68)	at com.noelios.restlet.http.HttpServerHelper.handle(HttpServerHelper.java:147)	at com.noelios.restlet.ext.servlet.ServerServlet.service(ServerServlet.java:881)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)	at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:502)	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)	at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:61)	at org.apache.shiro.web.servlet.AdviceFilter.executeChain(AdviceFilter.java:108)	at org.apache.shiro.web.servlet.AdviceFilter.doFilterInternal(AdviceFilter.java:137)	at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:81)	at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:66)	at org.apache.shiro.web.servlet.AdviceFilter.executeChain(AdviceFilter.java:108)	at org.apache.shiro.web.servlet.AdviceFilter.doFilterInternal(AdviceFilter.java:137)	at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:81)	at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:66)	at org.apache.shiro.web.servlet.AbstractShiroFilter.executeChain(AbstractShiroFilter.java:359)	at org.apache.shiro.web.servlet.AbstractShiroFilter$1.call(AbstractShiroFilter.java:275)	at org.apache.shiro.subject.support.SubjectCallable.doCall(SubjectCallable.java:90)	at org.apache.shiro.subject.support.SubjectCallable.call(SubjectCallable.java:83)	at org.apache.shiro.subject.support.DelegatingSubject.execute(DelegatingSubject.java:344)	at org.apache.shiro.web.servlet.AbstractShiroFilter.doFilterInternal(AbstractShiroFilter.java:272)	at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:81)	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1148)	at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:387)	at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)	at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)	at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)	at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:417)	at org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:230)	at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)	at org.mortbay.jetty.Server.handle(Server.java:326)	at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:534)	at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:864)	at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:539)	at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)	at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)	at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)	at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:520)