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java.lang.NullPointerException: 	at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:180)	at com.google.common.collect.ImmutableMap.entryOf(ImmutableMap.java:135)	at com.google.common.collect.ImmutableMap$Builder.put(ImmutableMap.java:170)	at com.google.common.collect.Maps.uniqueIndex(Maps.java:454)	at org.obiba.opal.core.unit.FunctionalUnitIdentifierMapper.(FunctionalUnitIdentifierMapper.java:42)	at org.obiba.opal.web.FunctionalUnitResource.mapIdentifiers(FunctionalUnitResource.java:308)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:140)	at org.jboss.resteasy.core.ResourceMethod.invokeOnTarget(ResourceMethod.java:246)	at org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:214)	at org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:204)	at org.jboss.resteasy.core.SynchronousDispatcher.getResponse(SynchronousDispatcher.java:486)	at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:463)	at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:117)	at org.jboss.resteasy.plugins.server.servlet.ServletContainerDispatcher.service(ServletContainerDispatcher.java:198)	at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:48)	at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:43)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)	at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:530)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1219)	at org.obiba.opal.server.httpd.OpalJettyServer$TransactionFilter$1.doInTransactionWithoutResult(OpalJettyServer.java:216)	at org.springframework.transaction.support.TransactionCallbackWithoutResult.doInTransaction(TransactionCallbackWithoutResult.java:33)	at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:130)	at org.obiba.opal.server.httpd.OpalJettyServer$TransactionFilter.doFilterInternal(OpalJettyServer.java:212)	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1190)	at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:83)	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1190)	at org.obiba.opal.server.httpd.security.AuthenticationFilter.doFilterInternal(AuthenticationFilter.java:60)	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1190)	at org.obiba.opal.server.httpd.OpalJettyServer$OpalVersionFilter.doFilterInternal(OpalJettyServer.java:197)	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1190)	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:424)	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:931)	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:361)	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:867)	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:117)	at org.eclipse.jetty.server.handler.HandlerList.handle(HandlerList.java:47)	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:113)	at org.eclipse.jetty.server.Server.handle(Server.java:337)	at org.eclipse.jetty.server.HttpConnection.handleRequest(HttpConnection.java:581)	at org.eclipse.jetty.server.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:1005)	at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:560)	at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:222)	at org.eclipse.jetty.server.HttpConnection.handle(HttpConnection.java:417)	at org.eclipse.jetty.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:474)	at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:437)	at java.lang.Thread.run(Thread.java:662)