org.apache.jasper.JasperException----- Root Cause -----java.lang.NullPointerException

[Bryan Woliner <br...@gmail.com>]

Ok,

So I was working with nutch a while back and then got sidetracked for about
a month and am coming back to it now. I am using Nutch 0.6 and I have a bash
script I wrote that calls the basic nutch commands neccessary for a basic
"whole-web crawl." As far as I can remember, the script worked fine last
time I ran it (about a month ago). However, when I run the script now, it
seems like the fetching, db update and indexing ran correctly, but then I
start tomcat and go to my search page (thats where things go amok). If I
type in a search term that returns zero results, nutch seems to be working
correctly and states that my search returned zero results:

Hits *0-0* (out of about 0 total matching pages):

However, when I type in a search term that matches one or more pages in my
index, I get a completely blank page. Additionally, when this occurs an
exception is generated and recorded in my /jakarta-tomcat-4.1.31
/logs/localhost_log.2005-10-24.txt file.

Here is the contents of my /jakarta-tomcat-4.1.31/logs/localhost_log.2005-
10-24.txt file when: (i) I start tomcat; and (ii) when I type in a search
term that should return 1 or more results, but instead returns a blank page.


When I enter a search term that correctly returns zero results, nothing is
added to this log file.

Any guidance is much appreciated!!

-Bryan

I. Starting Tomcat

2005-10-24 22:37:23 StandardHost[localhost]: Removing web application at
context path /admin
2005-10-24 22:37:23 StandardHost[localhost]: Removing web application at
context path /webdav
2005-10-24 22:37:23 StandardHost[localhost]: Removing web application at
context path /examples
2005-10-24 22:37:23 StandardHost[localhost]: Removing web application at
context path /tomcat-docs
2005-10-24 22:37:23 StandardHost[localhost]: Removing web application at
context path /nutch-0.6
2005-10-24 22:37:23 StandardHost[localhost]: Removing web application at
context path
2005-10-24 22:37:23 StandardHost[localhost]: Removing web application at
context path /manager
2005-10-24 22:37:32 HostConfig[localhost]: Deploying configuration
descriptor admin.xml
2005-10-24 22:37:35 HostConfig[localhost]: Deploying configuration
descriptor manager.xml
2005-10-24 22:37:35 WebappLoader[/manager]: Deploying class repositories to
work directory /usr/local/jakarta-tomcat-4.1.31
/work/Standalone/localhost/manager
2005-10-24 22:37:35 ContextConfig[/manager]: Configured an authenticator for
method BASIC
2005-10-24 22:37:35 StandardManager[/manager]: Seeding random number
generator class java.security.SecureRandom
2005-10-24 22:37:35 StandardManager[/manager]: Seeding of random number
generator has been completed
2005-10-24 22:37:35 StandardWrapper[/manager:default]: Loading container
servlet default
2005-10-24 22:37:35 StandardWrapper[/manager:invoker]: Loading container
servlet invoker
2005-10-24 22:37:35 HostConfig[localhost]: Expanding web application archive
ROOT.war
2005-10-24 22:37:35 StandardHost[localhost]: Installing web application at
context path from URL file:/usr/local/jakarta-tomcat-4.1.31/webapps/ROOT
2005-10-24 22:37:35 WebappLoader[]: Deploying class repositories to work
directory /usr/local/jakarta-tomcat-4.1.31/work/Standalone/localhost/_
2005-10-24 22:37:35 WebappLoader[]: Deploy class files /WEB-INF/classes to
/usr/local/jakarta-tomcat-4.1.31/webapps/ROOT/WEB-INF/classes
2005-10-24 22:37:35 WebappLoader[]: Deploy JAR /WEB-INF/lib/dom4j-1.4.jar to
/usr/local/jakarta-tomcat-4.1.31/webapps/ROOT/WEB-INF/lib/dom4j-1.4.jar
2005-10-24 22:37:35 WebappLoader[]: Deploy JAR
/WEB-INF/lib/lucene-1.4.2.jarto /usr/local/jakarta-
tomcat-4.1.31/webapps/ROOT/WEB-INF/lib/lucene-1.4.2.jar
2005-10-24 22:37:35 WebappLoader[]: Deploy JAR
/WEB-INF/lib/taglibs-i18n.jarto /usr/local/jakarta-
tomcat-4.1.31/webapps/ROOT/WEB-INF/lib/taglibs-i18n.jar
2005-10-24 22:37:35 WebappLoader[]: Deploy JAR /WEB-INF/lib/xerces-2_6_2-
apis.jar to /usr/local/jakarta-tomcat-4.1.31
/webapps/ROOT/WEB-INF/lib/xerces-2_6_2-apis.jar
2005-10-24 22:37:35 WebappLoader[]: Deploy JAR /WEB-INF/lib/xerces-2_6_2.jar
to /usr/local/jakarta-tomcat-4.1.31
/webapps/ROOT/WEB-INF/lib/xerces-2_6_2.jar
2005-10-24 22:37:35 StandardManager[]: Seeding random number generator class
java.security.SecureRandom
2005-10-24 22:37:35 StandardManager[]: Seeding of random number generator
has been completed
2005-10-24 22:37:35 StandardWrapper[:default]: Loading container servlet
default
2005-10-24 22:37:35 StandardWrapper[:invoker]: Loading container servlet
invoker
2005-10-24 22:37:35 HostConfig[localhost]: Deploying web application
directory tomcat-docs
2005-10-24 22:37:35 StandardHost[localhost]: Installing web application at
context path /tomcat-docs from URL file:/usr/local/jakarta-tomcat-4.1.31
/webapps/tomcat-docs
2005-10-24 22:37:35 WebappLoader[/tomcat-docs]: Deploying class repositories
to work directory /usr/local/jakarta-tomcat-4.1.31
/work/Standalone/localhost/tomcat-docs
2005-10-24 22:37:35 StandardManager[/tomcat-docs]: Seeding random number
generator class java.security.SecureRandom
2005-10-24 22:37:35 StandardManager[/tomcat-docs]: Seeding of random number
generator has been completed
2005-10-24 22:37:35 StandardWrapper[/tomcat-docs:default]: Loading container
servlet default
2005-10-24 22:37:35 StandardWrapper[/tomcat-docs:invoker]: Loading container
servlet invoker
2005-10-24 22:37:35 HostConfig[localhost]: Deploying web application
directory webdav
2005-10-24 22:37:35 StandardHost[localhost]: Installing web application at
context path /webdav from URL file:/usr/local/jakarta-tomcat-4.1.31
/webapps/webdav
2005-10-24 22:37:35 WebappLoader[/webdav]: Deploying class repositories to
work directory /usr/local/jakarta-tomcat-4.1.31
/work/Standalone/localhost/webdav
2005-10-24 22:37:35 StandardManager[/webdav]: Seeding random number
generator class java.security.SecureRandom
2005-10-24 22:37:35 StandardManager[/webdav]: Seeding of random number
generator has been completed
2005-10-24 22:37:35 StandardWrapper[/webdav:default]: Loading container
servlet default
2005-10-24 22:37:35 StandardWrapper[/webdav:invoker]: Loading container
servlet invoker
2005-10-24 22:37:35 HostConfig[localhost]: Deploying web application
directory nutch-0.6
2005-10-24 22:37:35 StandardHost[localhost]: Installing web application at
context path /nutch-0.6 from URL file:/usr/local/jakarta-tomcat-4.1.31
/webapps/nutch-0.6
2005-10-24 22:37:35 WebappLoader[/nutch-0.6]: Deploying class repositories
to work directory /usr/local/jakarta-tomcat-4.1.31
/work/Standalone/localhost/nutch-0.6
2005-10-24 22:37:35 WebappLoader[/nutch-0.6]: Deploy class files
/WEB-INF/classes to /usr/local/jakarta-tomcat-4.1.31/webapps/nutch-0.6
/WEB-INF/classes
2005-10-24 22:37:35 WebappLoader[/nutch-0.6]: Deploy JAR /WEB-INF/lib/dom4j-
1.4.jar to /usr/local/jakarta-tomcat-4.1.31/webapps/nutch-0.6
/WEB-INF/lib/dom4j-1.4.jar
2005-10-24 22:37:35 WebappLoader[/nutch-0.6]: Deploy JAR
/WEB-INF/lib/lucene-1.4.2.jar to /usr/local/jakarta-tomcat-4.1.31
/webapps/nutch-0.6/WEB-INF/lib/lucene-1.4.2.jar
2005-10-24 22:37:35 WebappLoader[/nutch-0.6]: Deploy JAR /WEB-INF/lib/nutch-
0.6.jar to /usr/local/jakarta-tomcat-4.1.31/webapps/nutch-0.6
/WEB-INF/lib/nutch-0.6.jar
2005-10-24 22:37:35 WebappLoader[/nutch-0.6]: Deploy JAR
/WEB-INF/lib/taglibs-i18n.jar to /usr/local/jakarta-tomcat-4.1.31
/webapps/nutch-0.6/WEB-INF/lib/taglibs-i18n.jar
2005-10-24 22:37:35 WebappLoader[/nutch-0.6]: Deploy JAR
/WEB-INF/lib/xerces-2_6_2-apis.jar to /usr/local/jakarta-tomcat-4.1.31
/webapps/nutch-0.6/WEB-INF/lib/xerces-2_6_2-apis.jar
2005-10-24 22:37:35 WebappLoader[/nutch-0.6]: Deploy JAR
/WEB-INF/lib/xerces-2_6_2.jar to /usr/local/jakarta-tomcat-4.1.31
/webapps/nutch-0.6/WEB-INF/lib/xerces-2_6_2.jar
2005-10-24 22:37:35 StandardManager[/nutch-0.6]: Seeding random number
generator class java.security.SecureRandom
2005-10-24 22:37:35 StandardManager[/nutch-0.6]: Seeding of random number
generator has been completed
2005-10-24 22:37:35 StandardWrapper[/nutch-0.6:default]: Loading container
servlet default
2005-10-24 22:37:35 StandardWrapper[/nutch-0.6:invoker]: Loading container
servlet invoker

II. When I type in a search term that should return 1 or more results, but
instead returns a blank page

org.apache.jasper.JasperException
at org.apache.jasper.servlet.JspServletWrapper.service(
JspServletWrapper.java:207)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:240)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:187)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:809)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(
ApplicationFilterChain.java:200)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(
ApplicationFilterChain.java:146)
at org.apache.catalina.core.StandardWrapperValve.invoke(
StandardWrapperValve.java:209)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext
(StandardPipeline.java:596)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java
:433)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
at org.apache.catalina.core.StandardContextValve.invoke(
StandardContextValve.java:144)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext
(StandardPipeline.java:596)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java
:433)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
at org.apache.catalina.core.StandardContext.invoke(StandardContext.java
:2358)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java
:133)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext
(StandardPipeline.java:596)
at org.apache.catalina.valves.ErrorDispatcherValve.invoke(
ErrorDispatcherValve.java:118)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext
(StandardPipeline.java:594)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:116)

at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext
(StandardPipeline.java:594)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java
:433)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
at org.apache.catalina.core.StandardEngineValve.invoke(
StandardEngineValve.java:127)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext
(StandardPipeline.java:596)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java
:433)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:152)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java
:799)
at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection
(Http11Protocol.java:705)
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)

at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(
ThreadPool.java:683)
at java.lang.Thread.run(Thread.java:534)
----- Root Cause -----
java.lang.NullPointerException
at net.nutch.searcher.FetchedSegments.getSummary(FetchedSegments.java:131)
at net.nutch.searcher.FetchedSegments.getSummary(FetchedSegments.java:140)
at net.nutch.searcher.NutchBean.getSummary(NutchBean.java:236)
at org.apache.jsp.search_jsp._jspService(search_jsp.java:261)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:92)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:809)
at org.apache.jasper.servlet.JspServletWrapper.service(
JspServletWrapper.java:162)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:240)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:187)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:809)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(
ApplicationFilterChain.java:200)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(
ApplicationFilterChain.java:146)
at org.apache.catalina.core.StandardWrapperValve.invoke(
StandardWrapperValve.java:209)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext
(StandardPipeline.java:596)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java
:433)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
at org.apache.catalina.core.StandardContextValve.invoke(
StandardContextValve.java:144)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext
(StandardPipeline.java:596)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java
:433)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
at org.apache.catalina.core.StandardContext.invoke(StandardContext.java
:2358)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java
:133)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext
(StandardPipeline.java:596)
at org.apache.catalina.valves.ErrorDispatcherValve.invoke(
ErrorDispatcherValve.java:118)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext
(StandardPipeline.java:594)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java
:116)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext
(StandardPipeline.java:594)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java
:433)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
at org.apache.catalina.core.StandardEngineValve.invoke(
StandardEngineValve.java:127)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext
(StandardPipeline.java:596)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java
:433)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:152)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java
:799)
at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection
(Http11Protocol.java:705)
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)

at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(
ThreadPool.java:683)
at java.lang.Thread.run(Thread.java:534)