I confirm this issue, since it has happened to me as well. Additionally I am providing following information.

A: Project page has menu "Clover HTML Coverage Report" on left panel as well as in middle of page pointing to URL ".../job/<project>/clover". Which tries to display content from "var/lib/hudson/jobs/<project>/builds/<date>" which seems wrong hence gives 404 status message.

B: While on the page of particular build which has generated clover coverage report; there appears 2 menu links on left navigation panel;

1: Clover HTML Report => ".../job/<project>/123/clover-report" but trying to display contents from above mentioned location hence again 404 status message.
2: Clover Summary Report => ".../job/Jobeet/70/clover" this successfully displays contents on right panel with header "Clover Coverage Report". Content includes "Overall Coverage Summary" and "Coverage Breakdown by Package". Here header "Coverage Breakdown by Package" just shows table headings like "name, Total Coverage %, method %, conditionals %, statements %" with link on those heading but nothing displays if you click on it (maybe another bug in this plugin or hudson itself).

I use F12, Phing, PHPUnit, Hudson 1.358, Firefox 3.5.9

I am also experiencing this issue. Very frustrating!

Same here.
Hudson v1.380 and Clover plugin v3.0.2

Any work in progress on this issue?

Clover Plugin works for me. the links on project and job pages work correctly.
Check your console log.
Can you find "No Clover report will be published due to a xxxx" in your console log.

In my case:
I use Phing plugin & xunit plugin.

my build.xml

<exec dir="."
              command="phpunit --log-junit 'reports/unitreport.xml' 
                               --coverage-html 'reports/coverage'                        
                               --coverage-clover 'reports/coverage/coverage.xml'
                               test/*Test.php"
/>

Project settings:
Clover report directory: phpsample/reports/coverage ( phpsample is module directory of subversion)
Clover report file name: coverage.xml

Note:
Clover plugin searches "Clover report directory" and its immediate children directories for index.html and coverage.xml.

Check your index.html.

Hmm, here you are generating HTML report by phpunit itself, I thought it is generated by Clover plugin from clover coverage file. If I do as you have done, then my problems A and B1 in original comment are solved. But point B2 is still not working. What is solution for them?

@arzala
Clover plugin does not generate html/pdf report, so you should generate it yourself.
B2: Are you using PHP 5.3 which supports "name space"?

@sogabe

Yes, we use 5.3.5. But what PHP has to do with B2 issue? I feel that http://issues.jenkins-ci.org/browse/JENKINS-6496 is related to this. So it seems some css/rendering issue. However I am just guessing from my experience.

@sogabe, what is status of this my B2 problem? You can check 2nd screen shot. Any work around or work in progress on your side?

@arzala sorry for late relpy.

The plugin tries to display package names with html link on "Coverage Breakdown by Package". but it can't display package name. because the coverage.xml which is generated by PHPUnit has no information about package.

coverage.xml by PHPUnit. no package information.

<?xml version="1.0" encoding="UTF-8"?>
<coverage generated="1300333562" phpunit="3.4.13">
  <project name="StringUtilTest" timestamp="1300333562">
    <file name="/var/lib/hudson/jobs/php-sample/workspace/phpsample/src/StringUtil.php">
      <class name="StringUtil" namespace="global">
        <metrics methods="2" coveredmethods="1" statements="2" coveredstatements="1" elements="4" coveredelements="2"/>
      </class&gt;

coverage.xml by clover. which has package information.

<?xml version="1.0" encoding="UTF-8"?>
<coverage generated="1301416984387" clover="3.0.2">
   <project timestamp="1301416979288" name="struts-jquery 1.0-SNAPSHOT">
      <metrics conditionals="16" methods="13" classes="5" files="5" packages="3" coveredstatements="17" complexity="29" loc="300" ncloc="160" coveredmethods="1" coveredconditionals="4" statements="63" coveredelements="22" elements="92"/>
      <package name="jp.ddo.bacons.jquery.http.filter">  <!-- here
         <metrics conditionals="10" methods="4" classes="1" files="1" coveredstatements="0" complexity="12" loc="134" 
                       ncloc="60" coveredmethods="0" coveredconditionals="0" statements="19" coveredelements="0" elements="33"/>
         <file name="EncodingFilter.java" path="/var/lib/hudson/jobs/struts-jquery-freestyle/workspace/src/main/java/jp/ddo/bacons/jquery/http/filter/EncodingFilter.java">
            <metrics classes="1" methods="4" conditionals="10" ncloc="60" coveredstatements="0" coveredmethods="0" complexity="12" coveredconditionals="0" statements="19" loc="134" coveredelements="0" elements="33"/>
            <class name="EncodingFilter">

@arzala

I've just release clover PHP Plugin. https://wiki.jenkins-ci.org/display/JENKINS/Clover+PHP+Plugin.
It supports only PHP.

Thanks, will use it and give you feedback.

This is proper solution for PHP based projects. Thanks for this plugin. It works nicely as per PHP related project's requirements. Please resolve this task.