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我是Liferay的新手。我正在處理一項任務，因爲我需要將XML中的列表內容轉換爲liferay文章。總之，我將巨大的內容列表轉換爲Liferay文章。如何將大量XML內容列表導入到Liferay中？
我開發了一個門戶網站，通過該網站將內容導入liferay。在導入期間，幾分鐘內將內容成功導入liferay。幾分鐘後，我得到了異常。我曾多次嘗試導入，但未能將完整內容導入liferay。
importing:java.lang.ArrayIndexOutOfBoundsException
Aug 27, 2015 9:38:16 AM org.apache.catalina.core.ApplicationDispatcher invoke
SEVERE: Servlet.service() for servlet jsp threw exception
java.lang.NullPointerException
atcom.liferay.portal.service.permission.PortletPermissionImpl.contains(PortletPermissionImpl.java:305)
atcom.liferay.portal.service.permission.PortletPermissionImpl.contains(PortletPermissionImpl.java:226)
atcom.liferay.portal.service.permission.PortletPermissionImpl.contains(PortletPermissionImpl.java:211)
atcom.liferay.portal.service.permission.PortletPermissionImpl.hasAccessPermission(PortletPermissionImpl.java:436)
atcom.liferay.portal.service.permission.PortletPermissionUtil.hasAccessPermission(PortletPermissionUtil.java:278)
atcom.liferay.portlet.SecurityPortletContainerWrapper.hasAccessPermission(SecurityPortletContainerWrapper.java:344)
atcom.liferay.portlet.SecurityPortletContainerWrapper.check(SecurityPortletContainerWrapper.java:209)
atcom.liferay.portlet.SecurityPortletContainerWrapper.checkRender(SecurityPortletContainerWrapper.java:243)
atcom.liferay.portlet.SecurityPortletContainerWrapper.render(SecurityPortletContainerWrapper.java:139)
atcom.liferay.portlet.RestrictPortletContainerWrapper.render(RestrictPortletContainerWrapper.java:126)
atcom.liferay.portal.kernel.portlet.PortletContainerUtil.render(PortletContainerUtil.java:156)
atcom.liferay.portal.layoutconfiguration.util.PortletRenderer._render(PortletRenderer.java:125)
atcom.liferay.portal.layoutconfiguration.util.PortletRenderer.access$4(PortletRenderer.java:107)
atcom.liferay.portal.layoutconfiguration.util.PortletRenderer$PortletRendererCallable.doCall(PortletRenderer.java:180)
atcom.liferay.portal.layoutconfiguration.util.PortletRenderer$PortletRendererCallable.doCall(PortletRenderer.java:1)
atcom.liferay.portal.kernel.executor.CopyThreadLocalCallable.call(CopyThreadLocalCallable.java:69)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
atcom.liferay.portal.kernel.concurrent.ThreadPoolExecutor$WorkerTask._runTask(ThreadPoolExecutor.java:682)
atcom.liferay.portal.kernel.concurrent.ThreadPoolExecutor$WorkerTask.run(ThreadPoolExecutor.java:593)
at java.lang.Thread.run(Thread.java:745)
09:38:16,735 ERROR [http-bio-9001-exec-134][status_jsp:753] javax.servlet.ServletException: java.util.concurrent.ExecutionException: com.liferay.portal.kernel.portlet.PortletContainerException: com.liferay.portal.kernel.portlet.PortletContainerException: java.lang.NullPointerException