我在 Mandravia Linux 上安装了 DSpace。我没有安装它，实际上我对它知之甚少。
直到最近提交开始花费太长时间并且没有显示集合时，它一直运行良好。最后一个错误显示为：
java.lang.NumberFormatException: null
=============================================
javax.servlet.ServletException: java.lang.NumberFormatException: null
at org.dspace.app.webui.servlet.HandleServlet.preProcessCommunityHome(HandleServlet.java:486)
at org.dspace.app.webui.servlet.HandleServlet.communityHome(HandleServlet.java:438)
at org.dspace.app.webui.servlet.HandleServlet.doDSGet(HandleServlet.java:250)
at org.dspace.app.webui.servlet.DSpaceServlet.processRequest(DSpaceServlet.java:119)
at org.dspace.app.webui.servlet.DSpaceServlet.doGet(DSpaceServlet.java:67)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.dspace.utils.servlet.DSpaceWebappServletFilter.doFilter(DSpaceWebappServletFilter.java:78)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:852)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Thread.java:662)
Caused by: java.lang.NumberFormatException: null
at java.lang.Integer.parseInt(Integer.java:417)
at java.lang.Integer.parseInt(Integer.java:499)
at org.dspace.app.webui.components.RecentSubmissionsManager.getRecentSubmissions(RecentSubmissionsManager.java:76)
at org.dspace.app.webui.components.RecentCommunitySubmissions.process(RecentCommunitySubmissions.java:48)
at org.dspace.app.webui.servlet.HandleServlet.preProcessCommunityHome(HandleServlet.java:480)
... 21 more
null
=============================================
java.lang.NumberFormatException: null
at java.lang.Integer.parseInt(Integer.java:417)
at java.lang.Integer.parseInt(Integer.java:499)
at org.dspace.app.webui.components.RecentSubmissionsManager.getRecentSubmissions(RecentSubmissionsManager.java:76)
at org.dspace.app.webui.components.RecentCommunitySubmissions.process(RecentCommunitySubmissions.java:48)
at org.dspace.app.webui.servlet.HandleServlet.preProcessCommunityHome(HandleServlet.java:480)
at org.dspace.app.webui.servlet.HandleServlet.communityHome(HandleServlet.java:438)
at org.dspace.app.webui.servlet.HandleServlet.doDSGet(HandleServlet.java:250)
at org.dspace.app.webui.servlet.DSpaceServlet.processRequest(DSpaceServlet.java:119)
at org.dspace.app.webui.servlet.DSpaceServlet.doGet(DSpaceServlet.java:67)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.dspace.utils.servlet.DSpaceWebappServletFilter.doFilter(DSpaceWebappServletFilter.java:78)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:852)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Thread.java:662)
我一直认为一个好的解决方案是重新安装 DSpace，但我担心问题是数据损坏、空值或类似的东西。
你怎么认为？