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  1. ,

    You try to parse a String that contains non-numeric characters to an int. The string must contain decimal characters only, optionally beginning with a + or - sign.

  2. ,

    Can occur when you try to convert a String to a numeric value but the String is not well formatted for the conversion.

Solutions on the web

via Sakai JIRA by John H Parker G, 1 year ago
java.lang.NumberFormatException: null at org.dspace.app.webui.servlet.HandleServlet.preProcessCommunityHome(HandleServlet.java:486)
via Sakai JIRA by John H Parker G, 2 years ago
java.lang.NumberFormatException: null at org.dspace.app.webui.servlet.HandleServlet.preProcessCommunityHome(HandleServlet.java:486)
via Stack Overflow by John
, 2 years ago
java.lang.NumberFormatException: null at org.dspace.app.webui.servlet.HandleServlet.preProcessCommunityHome(HandleServlet.java:486)
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)