Hi Mark,
You're incredible! Pointing out that null pointer, led me to find out that
our solr server configurations were not set up properly (we have an
external solr server). I logged out
the configurationService.getProperty("solr-statistics.server") and it was
coming back null. Fixed that and solr queries are now working in the
servlet. Wowza! Thank you DSpace Community! Thank you Mark, this has helped
me remove a blocker from our sprint. Please have a wonderful remainder of
the week and take care!
Thank you,
Rachel
On Tuesday, June 9, 2020 at 8:22:12 AM UTC-4, Mark H. Wood wrote:
>
> On Mon, Jun 08, 2020 at 09:16:17AM -0700, R W wrote:
> > I am reaching out to ask for a second pair of eyes on this custom
> servlet
> > that I'm migrating from DSpace JSPUI x5.9 to x6.3. The servlet builds
> and
> > deploys without any issues but does not return a response from the solr
> > query when the servlet URL is requested. The goal of this servlet is to
> > return json data about deposits that have been recently viewed, the
> > original solr query is in line 76. The logs don't indicate a solr
> response
> > is returned at all, the last log is at line 89 and doesn't go past line
> 93
> > where the response value is assigned. If anyone can spot anything I've
> > missed or have some feedback about another approach, that would be
> greatly
> > appreciated. Thank you for reading.
> >
> > Servlet
> > 60 public class SolrStatsServlet extends DSpaceServlet
> > 61 {
> > 62 /** log4j category */
> > 63 private static Logger log =
> > Logger.getLogger(SolrStatsServlet.class);
> > 64 private HandleService handleService;
> > 65 private ItemService itemService;
> > 66 // private static final String RESOURCE_TYPE_FIELD =
> > "search.resourcetype";
> > 67 private HttpSolrServer solr = null;
> > 68
> > 69 protected void doDSGet(Context context, HttpServletRequest
> request,
> > 70 HttpServletResponse response) throws ServletException,
> > IOException,
> > 71 SQLException, AuthorizeException {
> > 72
> > 73 handleService =
> > HandleServiceFactory.getInstance().getHandleService();
> > 74 itemService =
> > ContentServiceFactory.getInstance().getItemService();
> > 75
> > 76 // Original solr query -
> >
> 'select?indent=on&start=0&rows=10&q=type:2&fq=-isBot:true&fq=statistics_type:view&sort=time+desc'
>
>
> > 77 QueryResponse solrResponse = null;
> > 78
> > 79 try {
> > 80
> > 81 log.info("Debug 1");
> > 82 SolrQuery solrQuery = new
> SolrQuery().setQuery("type:2");
> > 83
> > 84 solrQuery.addFilterQuery("-isBot:true");
> > 85 solrQuery.addFilterQuery("statistics_type:view");
> > 86 solrQuery.addSortField("time", SolrQuery.ORDER.desc); //
> > sort by time
> > 87 solrQuery.setRows(10);// 10 results max
> > 88 log.info("Debug 2");
> > 89 log.info(solrQuery);
> > 90
> >
>
> //q=type%3A0&fq=-isBot%3Atrue&fq=statistics_type%3Aview&sort=time+desc&rows=10
>
>
> > 91
> > 92 // solrResponse = solr.query(solrQuery);
> > 93 solrResponse = solr.query(solrQuery,
> > SolrRequest.METHOD.GET);
> > 94 log.info("Debug 3");
> > 95
> > 96 } catch (SolrServerException e) {
> > 97 log.info("Debug 4 - ERROR");
> > 98 log.error("Solr failed to return docs for home page map:
> "
> > + e.getMessage());
> > 99 return;
> > 100 }
> > 101
> > 102 log.info("Debug 5");
> > 103 SolrDocumentList docList = solrResponse.getResults();
> > 104 log.info("Debug 6");
> >
> >
> > 136 }
> > 137
> > 138 protected void doDSPost(Context context, HttpServletRequest
> request,
> > 139 HttpServletResponse response) throws ServletException,
> > IOException,
> > 140 SQLException, AuthorizeException
> > 141 {
> > 142 // Treat as a GET
> > 143 doDSGet(context, request, response);
> > 144 }
> >
> >
> >
> > Dspace.log file
> >
> > 2020-06-08 11:55:56,314 INFO
> org.dspace.app.webui.servlet.SolrStatsServlet
> > @ Debug 1
> > 2020-06-08 11:55:56,315 INFO
> org.dspace.app.webui.servlet.SolrStatsServlet
> > @ Debug 2
> > 2020-06-08 11:55:56,315 INFO
> org.dspace.app.webui.servlet.SolrStatsServlet
> > @
> >
> q=type%3A2&fq=-isBot%3Atrue&fq=statistics_type%3Aview&sort=time+desc&rows=10
>
> > 2020-06-08 11:55:56,315 WARN org.dspace.app.webui.servlet.DSpaceServlet
> @
> >
> anonymous:session_id=09DCF4D40B91772CB2F26D8F645148E5:ip_addr=142.150.192.3:general_jspui_error:java.lang.NullPointerException
>
>
> > java.lang.NullPointerException
> > at
> >
> org.dspace.app.webui.servlet.SolrStatsServlet.doDSGet(SolrStatsServlet.java:93)
>
>
>
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>
> You have a NullPointerException, probably because 'solr' is set to
> null at line 67 and is never set to a reference afterward.
>
> --
> Mark H. Wood
> Lead Technology Analyst
>
> University Library
> Indiana University - Purdue University Indianapolis
> 755 W. Michigan Street
> Indianapolis, IN 46202
> 317-274-0749
> www.ulib.iupui.edu
>
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