我的lucene高亮时出现下面的错误,请问是什么意思? 怎么解决?

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我的lucene高亮时出现下面的错误,请问是什么意思? 怎么解决?40

Servlet.service() for servlet jsp threw exception
java.lang.NullPointerException
at org.apache.lucene.search.highlight.QueryTermExtractor.getTerms(QueryTermExtractor.java:125)
at org.apache.lucene.search.highlight.QueryTermExtractor.getTerms(QueryTermExtractor.java:96)
at org.apache.lucene.search.highlight.QueryTermExtractor.getTerms(QueryTermExtractor.java:109)
at org.apache.lucene.search.highlight.QueryTermExtractor.getTerms(QueryTermExtractor.java:48)
at org.apache.lucene.search.highlight.QueryScorer.<init>(QueryScorer.java:50)
at org.apache.jsp.results_jsp._jspService(results_jsp.java:244)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:331)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:329)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:174)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174)
at org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:200)
at org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:283)
at org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:773)
at org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:703)
at org.apache.jk.common.ChannelSocket$SocketConnection.runIt(ChannelSocket.java:895)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)
at java.lang.Thread.run(Thread.java:595)

入门技术 Lucene

2008年6月24日 08:50

myblessu
10
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10个答案按时间排序按投票排序

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采纳的答案

做如下判断：
Document doc = (Document) hits.doc(j);
String ct_title = doc.get("ct_title");
if (ct_title != null) {
TokenStream tokenStream = analyzer.tokenStream("ct_title",new StringReader(ct_title));
ct_title = highlighter.getBestFragment(tokenStream,ct_title);
ct_title = ct_title == null ? doc.get("ct_title"): ct_title;
}

2008年6月26日 10:19

sidubi
62
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