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java.util.ConcurrentModificationException: null at java.util.LinkedHashMap$LinkedHashIterator.nextEntry(LinkedHashMap.java:394)[na:1.7.0_25] at java.util.LinkedHashMap$KeyIterator.next(LinkedHashMap.java:405)[na:1.7.0_25] at java.util.Collections$UnmodifiableCollection$1.next(Collections.java:1067)[na:1.7.0_25] at org.obiba.magma.datasource.mongodb.MongoDBDatasource.drop(MongoDBDatasource.java:137)[magma-datasource-mongodb-1.8-20131105.152046-66.jar:1.8-SNAPSHOT] at org.obiba.magma.support.AbstractDatasourceWrapper.drop(AbstractDatasourceWrapper.java:107)[magma-api-1.8-20131105.152046-72.jar:1.8-SNAPSHOT] at org.obiba.magma.support.AbstractDatasourceWrapper.drop(AbstractDatasourceWrapper.java:107)[magma-api-1.8-20131105.152046-72.jar:1.8-SNAPSHOT] at org.obiba.opal.project.ProjectsServiceImpl.delete(ProjectsServiceImpl.java:115)[opal-project-2.0-SNAPSHOT.jar:na] at org.obiba.opal.web.project.ProjectResource.delete(ProjectResource.java:82)[opal-project-2.0-SNAPSHOT.jar:na] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)[na:1.7.0_25] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)[na:1.7.0_25] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)[na:1.7.0_25] at java.lang.reflect.Method.invoke(Method.java:606)[na:1.7.0_25] at org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:167)[resteasy-jaxrs-2.3.6.Final.jar:na] at org.jboss.resteasy.core.ResourceMethod.invokeOnTarget(ResourceMethod.java:269)[resteasy-jaxrs-2.3.6.Final.jar:na] at org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:227)[resteasy-jaxrs-2.3.6.Final.jar:na] at org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:216)[resteasy-jaxrs-2.3.6.Final.jar:na] at org.jboss.resteasy.core.SynchronousDispatcher.getResponse(SynchronousDispatcher.java:542)[resteasy-jaxrs-2.3.6.Final.jar:na] at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:524)[resteasy-jaxrs-2.3.6.Final.jar:na] at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:126)[resteasy-jaxrs-2.3.6.Final.jar:na] at org.jboss.resteasy.plugins.server.servlet.ServletContainerDispatcher.service(ServletContainerDispatcher.java:208)[resteasy-jaxrs-2.3.6.Final.jar:na] at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:55)[resteasy-jaxrs-2.3.6.Final.jar:na] at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:50)[resteasy-jaxrs-2.3.6.Final.jar:na] at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)[javax.servlet-2.5.0.v201103041518.jar:na] at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:652)[jetty-servlet-7.6.8.v20121106.jar:7.6.8.v20121106] at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1329)[jetty-servlet-7.6.8.v20121106.jar:7.6.8.v20121106] at org.obiba.opal.server.httpd.OpalJettyServer$TransactionFilter$1.doInTransactionWithoutResult(OpalJettyServer.java:325)[opal-httpd-2.0-SNAPSHOT.jar:na] at org.springframework.transaction.support.TransactionCallbackWithoutResult.doInTransaction(TransactionCallbackWithoutResult.java:33)[spring-tx-3.2.4.RELEASE.jar:3.2.4.RELEASE] at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:131)[spring-tx-3.2.4.RELEASE.jar:3.2.4.RELEASE] at org.obiba.opal.server.httpd.OpalJettyServer$TransactionFilter.doFilterInternal(OpalJettyServer.java:321)[opal-httpd-2.0-SNAPSHOT.jar:na] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)[spring-web-3.2.4.RELEASE.jar:3.2.4.RELEASE] at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1300)[jetty-servlet-7.6.8.v20121106.jar:7.6.8.v20121106] at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99)[spring-web-3.2.4.RELEASE.jar:3.2.4.RELEASE] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)[spring-web-3.2.4.RELEASE.jar:3.2.4.RELEASE] at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1300)[jetty-servlet-7.6.8.v20121106.jar:7.6.8.v20121106] at org.obiba.opal.server.httpd.security.AuthenticationFilter.doFilterInternal(AuthenticationFilter.java:82)[opal-httpd-2.0-SNAPSHOT.jar:na] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)[spring-web-3.2.4.RELEASE.jar:3.2.4.RELEASE] at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1300)[jetty-servlet-7.6.8.v20121106.jar:7.6.8.v20121106] at org.obiba.opal.server.httpd.OpalJettyServer$OpalVersionFilter.doFilterInternal(OpalJettyServer.java:305)[opal-httpd-2.0-SNAPSHOT.jar:na] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)[spring-web-3.2.4.RELEASE.jar:3.2.4.RELEASE] at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1300)[jetty-servlet-7.6.8.v20121106.jar:7.6.8.v20121106] at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:445)[jetty-servlet-7.6.8.v20121106.jar:7.6.8.v20121106] at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1038)[jetty-server-7.6.8.v20121106.jar:7.6.8.v20121106] at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:374)[jetty-servlet-7.6.8.v20121106.jar:7.6.8.v20121106] at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:972)[jetty-server-7.6.8.v20121106.jar:7.6.8.v20121106] at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)[jetty-server-7.6.8.v20121106.jar:7.6.8.v20121106] at org.eclipse.jetty.server.handler.HandlerList.handle(HandlerList.java:52)[jetty-server-7.6.8.v20121106.jar:7.6.8.v20121106] at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)[jetty-server-7.6.8.v20121106.jar:7.6.8.v20121106] at org.eclipse.jetty.server.Server.handle(Server.java:363)[jetty-server-7.6.8.v20121106.jar:7.6.8.v20121106] at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:483)[jetty-server-7.6.8.v20121106.jar:7.6.8.v20121106] at org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:920)[jetty-server-7.6.8.v20121106.jar:7.6.8.v20121106] at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:982)[jetty-server-7.6.8.v20121106.jar:7.6.8.v20121106] at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:635)[jetty-http-7.6.8.v20121106.jar:7.6.8.v20121106] at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:235)[jetty-http-7.6.8.v20121106.jar:7.6.8.v20121106] at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82)[jetty-server-7.6.8.v20121106.jar:7.6.8.v20121106] at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:628)[jetty-io-7.6.8.v20121106.jar:7.6.8.v20121106] at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:52)[jetty-io-7.6.8.v20121106.jar:7.6.8.v20121106] at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)[jetty-util-7.6.8.v20121106.jar:7.6.8.v20121106] at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543)[jetty-util-7.6.8.v20121106.jar:7.6.8.v20121106] at java.lang.Thread.run(Thread.java:724)[na:1.7.0_25]