Search using Lucene: Unknown format version: -4

[Ravikumar Jambunathan]

Hi All,

Hope this is the right forum to post this question.

I have created a search application using Lucene, which works very well as a standalone application. However, when i try to call the search application from a servlet, i am getting the below exception. I am not very clear on the exception and hence i am not able to think of a remedy beyond certain level. Therefore, if anybody encountered similar problem; could you please share your experience, expecially on the exception itself and on the resolution part of it. The application details are,

Tomcat server 5.5.26
Java 1.5.15
Lucene 2.3.1

Here is the exception.

Searching starts...
Index directory = org.apache.lucene.store.FSDirectory@D:\EclipseProjects\KnowledgeBase\docbase
java.io.IOException: Unknown format version: -4
at org.apache.lucene.index.SegmentInfos.read(SegmentInfos.java:195)
at org.apache.lucene.index.IndexReader$1.doBody(IndexReader.java:152)
at org.apache.lucene.index.SegmentInfos$FindSegmentsFile.run(SegmentInfos.java:579)
at org.apache.lucene.index.IndexReader.open(IndexReader.java:147)
at org.apache.lucene.index.IndexReader.open(IndexReader.java:142)
at org.apache.lucene.search.IndexSearcher.<init>(IndexSearcher.java:48)
at com.kb.logic.IndexSearch.search(IndexSearch.java:31)
at com.kb.servlet.SearchServlet.doPost(SearchServlet.java:62)
at com.kb.servlet.SearchServlet.doGet(SearchServlet.java:36)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
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.coyote.http11.Http11Processor.process(Http11Processor.java:874)
at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)
at java.lang.Thread.run(Thread.java:595)

Thanks a lot for your help.

Regards,
ravi

[Ulf Dittmer]

Not sure if that's the problem, but make sure that the Lucene version used to create the index is the same that's being used to read it.

[Ravikumar Jambunathan]

Hi Ulf,

Thanks a lot, you suggestion works. There was old version of lucene jar file in my tomcat directory. I removed the old version, it works now.

thanks again.

thanks and regards,
ravi.