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From "Fitzgibbons, Brad" <bfitzgibb...@techtarget.com>
Subject RowIterator.next() fails when hasNext() returns true
Date Wed, 09 Jul 2008 15:34:25 GMT
I'm running into this problem occasionally resulting in the exception below.  I'm using Jackrabbit
1.4 (with core at 1.4.2).  I'm using the H2PersistenceManager and almost all configuration
values are set to their released default. Document order is turned off so the query is using
a LazyScoreNodeIterator.  I'm running in a transactional environment, and my entire execution
flow is contained by a single, read-only, JTA transaction.  The single transaction includes
executing the query and all interactions with the returned RowIterator.  If I ignore the NoSuchElementException's
and continue using the iterator then there are often good results subsequent to the error.
 I've noticed that when these errors occur there are often far more results than are returned
by RowIterator.getSize().  I realize that getSize() is not meant to be an accurate count of
all results, but in most other cases getSize() is greater than the size of the result set
(this may not be helpful).  I'm using a SQL query that involves the CONTAINS constraint (so
lucene) and ordering by jcr:score.  Does this warrant a bug submission?  Is there any additional
information which might help?

org.springframework.web.util.NestedServletException: Request processing failed; nested exception
is java.util.NoSuchElementException
        at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:535)
        at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:453)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:114)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:91)
        at com.caucho.server.dispatch.ServletFilterChain.doFilter(ServletFilterChain.java:103)
        at com.caucho.server.webapp.WebAppFilterChain.doFilter(WebAppFilterChain.java:181)
        at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:266)
        at com.caucho.server.http.HttpRequest.handleRequest(HttpRequest.java:269)
        at com.caucho.server.port.TcpConnection.run(TcpConnection.java:603)
        at com.caucho.util.ThreadPool$Item.runTasks(ThreadPool.java:721)
        at com.caucho.util.ThreadPool$Item.run(ThreadPool.java:643)
        at java.lang.Thread.run(Thread.java:619)
Caused by: java.util.NoSuchElementException
        at org.apache.jackrabbit.core.query.lucene.QueryResultImpl$LazyScoreNodeIterator.getScore(QueryResultImpl.java:351)
        at org.apache.jackrabbit.core.query.lucene.RowIteratorImpl.nextRow(RowIteratorImpl.java:153)
        at com.techtarget.content.data.jcr1.ElementDaoImpl.nextElement(ElementDaoImpl.java:722)
        at com.techtarget.content.data.jcr1.PropertyIterator.next(PropertyIterator.java:47)
        at com.techtarget.content.data.jcr1.PropertyIterator.next(PropertyIterator.java:21)
        at com.techtarget.content.web.controller.ProfileController.resourceQueryAndPrint(ProfileController.java:125)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.springframework.web.bind.annotation.support.HandlerMethodInvoker.doInvokeMethod(HandlerMethodInvoker.java:305)
        at org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:131)
        at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:308)
        at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:295)
        at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:874)
        at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:808)
        at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:523)
        at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:453)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:114)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:91)
        at com.caucho.server.dispatch.ServletFilterChain.doFilter(ServletFilterChain.java:103)
        at com.caucho.server.webapp.WebAppFilterChain.doFilter(WebAppFilterChain.java:181)
        at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:266)
        at com.caucho.server.http.HttpRequest.handleRequest(HttpRequest.java:269)
        at com.caucho.server.port.TcpConnection.run(TcpConnection.java:603)
        at com.caucho.util.ThreadPool$Item.runTasks(ThreadPool.java:721)
        at com.caucho.util.ThreadPool$Item.run(ThreadPool.java:643)
        at java.lang.Thread.run(Thread.java:619)

Brad Fitzgibbons
Senior Software Engineer
Tech Target
The Most Targeted IT Media
http://www.techtarget.com/



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