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I have downloaded solr from here and untar'd it. Then went to the example directory in apache-solr-3.1.0/solr/example and ran this command

java -jar start.jar

But when I open http://localhost:8983/solr/admin/

it shows like this

HTTP ERROR: 404 Problem accessing /solr/admin/.

Reason:

NOT_FOUND

Powered by Jetty://

I'm using Ubuntu 11.04. Why this problem is coming?

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4 Answers

I've been experiencing this issue as well and finally found the details and resolution to the matter. The issue (as I understand) is specific to using Jetty as your servlet container.

The cause is that Jetty will place some files in the OS's /tmp directory--and occasionally the OS will delete them. In this scenario your admin pages will start returning 404's with the exception you've mentioned, but all searches and queries continue to execute as normal.

The solution is simple: creating a work subdirectory underneath your jetty.home folder (a runtime variable) will solve the problem. Jetty will see the work folder and will place temporary files in that location rather than in /tmp. The OS doesn't manage this location and therefore won't delete files that are still in use.

There is a bug report detailing this issue and resolution filed at: https://issues.apache.org/jira/browse/SOLR-118

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  1. Stop Solr
  2. Go to the directory where you run "java -jar start.jar"
  3. mkdir work
  4. java -jar start.jar

It seems that Jetty will use the work directory if it exists, otherwise it uses /tmp

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If your install is running mostly with the defaults, then Jetty's work files are probably in /tmp where they may have been wiped.

Stop and restart Solr after creating a $(jetty.home)/work directory and you should stop seeing the 404s.

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WHERE IS JETTY.HOME –  Rahul Mehta Sep 17 '11 at 6:27
    
@Rahul Mehta its in gem file sunspot_solr-2.1.0\solr\etc\jetty.xml –  Selva Feb 13 at 8:32
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It is probably better to ask for help on a different forum, because the problem you have does not seem to have any connection with ubuntu.

Anyway, one of the first hits on google brings me to: http://lucene.472066.n3.nabble.com/Adding-the-suggest-component-td2694982.html Try running:

    ant clean example 

prior to java -jar start.jar

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