NPE error when extending DefaultSolrHighlighter

[Gerald <ge...@topproducer.com>]

I was looking at solr-386 and thought I would try to create a custom
highlighter for something I was doing. 

I created a class that looks something like this: 

public class CustomOutputHighlighter extends DefaultSolrHighlighter { 
         @Override 
         public NamedList doHighlighting(DocList docs, Query query,
SolrQueryRequest req, String[] defaultFields) throws IOException { 
                 NamedList highlightedValues = super.doHighlighting(docs,
query, req, defaultFields); 
                  
                 // do more stuff here 

                 return highlightedValues 
                 } 
} 

and have replaced the <highlighting> line in my solrconfig xml so that it
looks something like this: 

<highlighting class="com.xxxxxxx.solr.highlight.CustomOutputHighlighter"> 

and left all the existing default highlighting parameters as-is 

The code compiles with no problem, and should simply perform the normal
highlighting (since all I am doing is calling the original doHighlighting
code and returning the results).  However, when I start Solr, I get an NPE
error: 

java.lang.NullPointerException 
        at
org.apache.solr.highlight.DefaultSolrHighlighter.init(DefaultSolrHighlighter.java:75) 
        at
org.apache.solr.core.SolrCore.createInitInstance(SolrCore.java:437) 
        at org.apache.solr.core.SolrCore.initHighLighter(SolrCore.java:612) 
        at org.apache.solr.core.SolrCore.<init>(SolrCore.java:558) 
        at
org.apache.solr.core.CoreContainer$Initializer.initialize(CoreContainer.java:137) 
        at
org.apache.solr.servlet.SolrDispatchFilter.init(SolrDispatchFilter.java:83) 
        at
org.mortbay.jetty.servlet.FilterHolder.doStart(FilterHolder.java:99) 
        at
org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:40) 
        at
org.mortbay.jetty.servlet.ServletHandler.initialize(ServletHandler.java:594) 
        at org.mortbay.jetty.servlet.Context.startContext(Context.java:139) 
        at
org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1218) 
        at
org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:500) 
        at
org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:448) 
        at
org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:40) 
        at
org.mortbay.jetty.handler.HandlerCollection.doStart(HandlerCollection.java:147) 
        at
org.mortbay.jetty.handler.ContextHandlerCollection.doStart(ContextHandlerCollection.java:161) 
        at
org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:40) 
        at
org.mortbay.jetty.handler.HandlerCollection.doStart(HandlerCollection.java:147) 
        at
org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:40) 
        at
org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:117) 
        at org.mortbay.jetty.Server.doStart(Server.java:210) 
        at
org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:40) 
        at org.mortbay.xml.XmlConfiguration.main(XmlConfiguration.java:929) 
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) 
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) 
        at java.lang.reflect.Method.invoke(Unknown Source) 
        at org.mortbay.start.Main.invokeMain(Main.java:183) 
        at org.mortbay.start.Main.start(Main.java:497) 
        at org.mortbay.start.Main.main(Main.java:115) 

It doesn't seem to even call my custom highlighter (I put a breakpoint in
which did not get hit).  Any ideas re what I am doing wrong?? 

If I use the default highlighter, I don't get this error and have no
problems 

I am using a copy of 1.5.0-dev solr ($Id: CHANGES.txt 906924 2010-02-05
12:43:11Z noble $) 

thanks for any advice 
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Re: NPE error when extending DefaultSolrHighlighter

[Koji Sekiguchi <ko...@r.email.ne.jp>]

(10/06/01 6:45), Gerald wrote:
> I was looking at solr-386 and thought I would try to create a custom
> highlighter for something I was doing.
>
> I created a class that looks something like this:
>
> public class CustomOutputHighlighter extends DefaultSolrHighlighter {
>           @Override
>           public NamedList doHighlighting(DocList docs, Query query,
> SolrQueryRequest req, String[] defaultFields) throws IOException {
>                   NamedList highlightedValues = super.doHighlighting(docs,
> query, req, defaultFields);
>
>                   // do more stuff here
>
>                   return highlightedValues
>                   }
> }
>
> and have replaced the<highlighting>  line in my solrconfig xml so that it
> looks something like this:
>
> <highlighting class="com.xxxxxxx.solr.highlight.CustomOutputHighlighter">
>
> and left all the existing default highlighting parameters as-is
>
> The code compiles with no problem, and should simply perform the normal
> highlighting (since all I am doing is calling the original doHighlighting
> code and returning the results).  However, when I start Solr, I get an NPE
> error:
>
>    
Try to put a constructor that has an argument SolrCore:

public CustomOutputHighlighter(SolrCore core){
     super(core);
}

Koji

-- 
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