phpmyadmin is showing the correct utf8_general_ci also apache is set to default charset utf8 and also I told in my php.ini to use utf8 as default charset.
I have a bit more to provide: if you post a comment, I get an Alert "Request failed", aftert I click on the OK-Button. the Textarea gets filled with following:
<br />
<b>Warning</b>: mysql_real_escape_string() expects parameter 2 to be resource, object given in <b>/var/www/http/components/com_comment/joscomment/utils.php</b> on line <b>678</b><br />
<br />
<b>Warning</b>: mysql_real_escape_string() expects parameter 2 to be resource, object given in <b>/var/www/http/components/com_comment/joscomment/utils.php</b> on line <b>678</b><br />
<br />
<b>Warning</b>: mysql_real_escape_string() expects parameter 2 to be resource, object given in <b>/var/www/http/components/com_comment/joscomment/utils.php</b> on line <b>678</b><br />
<br />
<b>Warning</b>: mysql_real_escape_string() expects parameter 2 to be resource, object given in <b>/var/www/http/components/com_comment/joscomment/utils.php</b> on line <b>678</b><br />
<br />
<b>Warning</b>: mysql_real_escape_string() expects parameter 2 to be resource, object given in <b>/var/www/http/components/com_comment/joscomment/utils.php</b> on line <b>678</b><br />
<br />
<b>Warning</b>: mysql_real_escape_string() expects parameter 2 to be resource, object given in <b>/var/www/http/components/com_comment/joscomment/utils.php</b> on line <b>678</b><br />
<?xml version="1.0" standalone="yes"?><post><id>4</id><after>-1</after><published>1</published><noerror>1</noerror><debug></debug><body><![CDATA[
<table class='postcontainer' id='post4' width='100%' cellpadding='0' cellspacing='0' style='margin-left:0px;'><!-- style='padding-left:0px;'> -->
<tr>
<td><a name='josc4'></a>
<table class='post' width='100%' cellpadding='0' cellspacing='0'>
<tbody class='sectiontableentry'>
<tr>
<td><table class='postheader' width='100%' cellpadding='0' cellspacing='0'>
<tr>
<td align='left'>
<span class='postusername'>Snoop</span>
</td>
<td align='right'>
<span class='postnotify0' title='do not notify if new post'> </span>
|<span class='postusertype'><span class='administrator'>SAdministrator</span></span>
|<span class='createdate'>2008-07-23 15:54:32</span>
</td>
</tr>
</table></td>
</tr>
<tr>
<td colspan='2'><table class='postbody' width='100%' cellpadding='0' cellspacing='0'>
<tr>
<td style='overflow: hidden;'>Character problem. empty comment</td>
</tr>
</table></td>
</tr>
<tr>
<td><table class='postfooter' width='100%' cellpadding='0' cellspacing='0'>
<tr>
<td align='left'><a href='javascript:JOSC_reply(4)'>Antworten</a> | <a href = 'javascript:JOSC_quote(4)'>Zitat</a> | <a href='javascript:JOSC_editComment(4)'>Bearbeiten</a> | <a href='javascript:JOSC_deleteComment(4)'>Löschen</a></td>
<td align='right'><table cellspacing='0' cellpadding='0' border='0'><tr><td><a id='yes4' class='voting_yes' href='javascript:JOSC_voting(4,"yes")'>0</a></td><td> </td><td><a id='no4' class='voting_no' href='javascript:JOSC_voting(4,"no")'>0</a></td></tr></table></td>
</tr>
</table></td>
</tr>
</tbody>
</table>
</td>
</tr>
</table>
]]></body></post>
As I understand it seems ,$database is empty.
Thanks for your quick answer.
EDIT:
I found out that I can edit these Comments on administrator/index2.php?option=com_comment&task=edit&id=x (x stands for the comment id)
so its possibly just a frontend-problem.