Servlet Error: NullPointer

An unexpected servlet error has occurred.

Stack Trace:



java.lang.NullPointerException at java.base/java.lang.String.compareTo(String.java:1196) at org.apache.lucene.index.TermBuffer.compareTo(TermBuffer.java:35) at org.apache.lucene.index.SegmentTermEnum.scanTo(SegmentTermEnum.java:149) at org.apache.lucene.index.TermInfosReader.scanEnum(TermInfosReader.java:163) at org.apache.lucene.index.TermInfosReader.get(TermInfosReader.java:152) at org.apache.lucene.index.SegmentTermDocs.seek(SegmentTermDocs.java:51) at org.apache.lucene.index.IndexReader.termPositions(IndexReader.java:507) at org.apache.lucene.limit.LimIndexReader.termPositions(LimIndexReader.java:250) at org.apache.lucene.search.spans.SpanTermQuery$1.<init>(SpanTermQuery.java:94) at org.apache.lucene.search.spans.SpanTermQuery.getSpans(SpanTermQuery.java:92) at org.apache.lucene.search.spans.NearSpans.<init>(NearSpans.java:278) at org.apache.lucene.search.spans.SpanNearQuery.getSpans(SpanNearQuery.java:154) at org.apache.lucene.search.spans.SpanOrQuery$1.<init>(SpanOrQuery.java:161) at org.apache.lucene.search.spans.SpanOrQuery.getSpans(SpanOrQuery.java:153) at org.apache.lucene.search.spans.SpanNearQuery.getSpans(SpanNearQuery.java:152) at org.cdlib.xtf.textEngine.SpanExactQuery.getSpans(SpanExactQuery.java:253) at org.apache.lucene.search.spans.SpanWeight.scorer(SpanWeight.java:74) at org.apache.lucene.search.BooleanQuery$BooleanWeight2.scorer(BooleanQuery.java:355) at org.apache.lucene.search.RecordingSearcher.search(RecordingSearcher.java:89) at org.cdlib.xtf.textEngine.DefaultQueryProcessor.processRequest(DefaultQueryProcessor.java:310) at org.cdlib.xtf.crossQuery.CrossQuery.apply(CrossQuery.java:206) at org.cdlib.xtf.crossQuery.CrossQuery.doGet(CrossQuery.java:153) at javax.servlet.http.HttpServlet.service(HttpServlet.java:624) at org.cdlib.xtf.servletBase.TextServlet.service(TextServlet.java:449) at javax.servlet.http.HttpServlet.service(HttpServlet.java:731) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:218) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:110) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:498) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:962) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:445) at org.apache.coyote.ajp.AjpProcessor.process(AjpProcessor.java:190) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:637) at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.base/java.lang.Thread.run(Thread.java:829)