tomcat-users mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "T. Gau" <t...@normad.de>
Subject Re: Tomcat 6 does not respond or freeze after startup
Date Thu, 05 Aug 2010 06:03:22 GMT
  Hello,

as I understand the netstat output the mentioned PID's are the client 
ports instead.

I'm just calling http://localhost:8080 via a web browser, e.g. Firefox. 
Following the history of my calls against Tomcat:

Proto  Lokale Adresse         Remoteadresse          Status           PID
After startup
TCP    0.0.0.0:8009           0.0.0.0:0              LISTENING         
2408    [java.exe]
TCP    0.0.0.0:8080           0.0.0.0:0              LISTENING         
2408    [java.exe]
TCP    127.0.0.1:8005         0.0.0.0:0              LISTENING         
2408    [java.exe]

After first successfull accesses to Tomcat (http://localhost:8080)
TCP    127.0.0.1:1255         127.0.0.1:8080         CONNECTED     
3568    [firefox.exe]
TCP    127.0.0.1:1256         127.0.0.1:8080         CONNECTED     
3568    [firefox.exe]
TCP    127.0.0.1:1257         127.0.0.1:8080         CONNECTED     
3568    [firefox.exe]
TCP    127.0.0.1:8080         127.0.0.1:1256         CONNECTED     
2408    [java.exe]
TCP    127.0.0.1:8080         127.0.0.1:1257         CONNECTED     
2408    [java.exe]
TCP    127.0.0.1:8080         127.0.0.1:1255         CONNECTED     
2408    [java.exe]
What seems conspiciuous is that the home page from http://localhost:8080 
is loaded but the images to the apache foundation and the powered by are 
missing and the browser is showing as still loading.


After some more accesses, Tomcat freezed
TCP    127.0.0.1:1256         127.0.0.1:8080         CONNECTED     
3568    [firefox.exe]
TCP    127.0.0.1:1257         127.0.0.1:8080         CONNECTED     
3568    [firefox.exe]
TCP    127.0.0.1:8080         127.0.0.1:1256         CONNECTED     
2408    [java.exe]
TCP    127.0.0.1:8080         127.0.0.1:1257         CONNECTED     
2408    [java.exe]
TCP    127.0.0.1:1261         127.0.0.1:8080         FIN_WAIT_2    
3568    [firefox.exe]
TCP    127.0.0.1:1262         127.0.0.1:8080         FIN_WAIT_2    
3568    [firefox.exe]
TCP    127.0.0.1:1263         127.0.0.1:8080         FIN_WAIT_2    
3568    [firefox.exe]
TCP    127.0.0.1:1264         127.0.0.1:8080         FIN_WAIT_2    
3568    [firefox.exe]
TCP    127.0.0.1:8080         127.0.0.1:1263         CLOSE_WAIT    
2408    [java.exe]
TCP    127.0.0.1:8080         127.0.0.1:1261         CLOSE_WAIT    
2408    [java.exe]
TCP    127.0.0.1:8080         127.0.0.1:1264         CLOSE_WAIT    
2408    [java.exe]
TCP    127.0.0.1:8080         127.0.0.1:1262         CLOSE_WAIT    
2408    [java.exe]
TCP    127.0.0.1:8080         127.0.0.1:1255         WAITING         0

... and again some accesses
TCP    127.0.0.1:1256         127.0.0.1:8080         CONNECTED     
3568    [firefox.exe]
TCP    127.0.0.1:1257         127.0.0.1:8080         CONNECTED     
3568    [firefox.exe]
TCP    127.0.0.1:8080         127.0.0.1:1257         CONNECTED     
2408    [java.exe]
TCP    127.0.0.1:8080         127.0.0.1:1256         CONNECTED     
2408    [java.exe]
TCP    127.0.0.1:1265         127.0.0.1:8080         FIN_WAIT_2    
3568    [firefox.exe]
TCP    127.0.0.1:1266         127.0.0.1:8080         FIN_WAIT_2    
3568    [firefox.exe]
TCP    127.0.0.1:1267         127.0.0.1:8080         FIN_WAIT_2    
3568    [firefox.exe]
TCP    127.0.0.1:1268         127.0.0.1:8080         FIN_WAIT_2    
3568    [firefox.exe]
TCP    127.0.0.1:8080         127.0.0.1:1265         CLOSE_WAIT    
2408    [java.exe]
TCP    127.0.0.1:8080         127.0.0.1:1264         CLOSE_WAIT    
2408    [java.exe]
TCP    127.0.0.1:8080         127.0.0.1:1263         CLOSE_WAIT    
2408    [java.exe]
TCP    127.0.0.1:8080         127.0.0.1:1262         CLOSE_WAIT    
2408    [java.exe]
TCP    127.0.0.1:8080         127.0.0.1:1261         CLOSE_WAIT    
2408    [java.exe]
TCP    127.0.0.1:8080         127.0.0.1:1266         CLOSE_WAIT    
2408    [java.exe]
TCP    127.0.0.1:8080         127.0.0.1:1267         CLOSE_WAIT    
2408    [java.exe]
TCP    127.0.0.1:8080         127.0.0.1:1268         CLOSE_WAIT    
2408    [java.exe]

After some waiting
TCP    127.0.0.1:1256         127.0.0.1:8080         CONNECTED     
3568    [firefox.exe]
TCP    127.0.0.1:1257         127.0.0.1:8080         CONNECTED     
3568    [firefox.exe]
TCP    127.0.0.1:8080         127.0.0.1:1257         CONNECTED     
2408    [java.exe]
TCP    127.0.0.1:8080         127.0.0.1:1256         CONNECTED     
2408    [java.exe]
TCP    127.0.0.1:8080         127.0.0.1:1265         CLOSE_WAIT    
2408    [java.exe]
TCP    127.0.0.1:8080         127.0.0.1:1267         CLOSE_WAIT    
2408    [java.exe]
TCP    127.0.0.1:8080         127.0.0.1:1264         CLOSE_WAIT    
2408    [java.exe]
TCP    127.0.0.1:8080         127.0.0.1:1263         CLOSE_WAIT    
2408    [java.exe]
TCP    127.0.0.1:8080         127.0.0.1:1262         CLOSE_WAIT    
2408    [java.exe]
TCP    127.0.0.1:8080         127.0.0.1:1261         CLOSE_WAIT    
2408    [java.exe]
TCP    127.0.0.1:8080         127.0.0.1:1268         CLOSE_WAIT    
2408    [java.exe]
TCP    127.0.0.1:8080         127.0.0.1:1266         CLOSE_WAIT    
2408    [java.exe]

After closing tomcat
TCP    127.0.0.1:1256         127.0.0.1:8080         FIN_WAIT_2    
3568    [System]
TCP    127.0.0.1:1257         127.0.0.1:8080         FIN_WAIT_2    
3568    [System]
TCP    127.0.0.1:8080         127.0.0.1:1267         CLOSE_WAIT    
2408    [java.exe]
TCP    127.0.0.1:8080         127.0.0.1:1257         CLOSE_WAIT    
2408    [java.exe]
TCP    127.0.0.1:8080         127.0.0.1:1265         CLOSE_WAIT    
2408    [java.exe]
TCP    127.0.0.1:8080         127.0.0.1:1256         CLOSE_WAIT    
2408    [java.exe]
TCP    127.0.0.1:8080         127.0.0.1:1268         CLOSE_WAIT    
2408    [java.exe]
TCP    127.0.0.1:8080         127.0.0.1:1264         CLOSE_WAIT    
2408    [java.exe]
TCP    127.0.0.1:8080         127.0.0.1:1263         CLOSE_WAIT    
2408    [java.exe]
TCP    127.0.0.1:8080         127.0.0.1:1262         CLOSE_WAIT    
2408    [java.exe]
TCP    127.0.0.1:8080         127.0.0.1:1266         CLOSE_WAIT    
2408    [java.exe]
TCP    127.0.0.1:8080         127.0.0.1:1261         CLOSE_WAIT    
2408    [java.exe]
Later after some time System is closing its sockets, too.


After the freeze of Tomcat the Firefox browser shows the "loading sign" 
for each request against http://localhost:8080.


Hope this helps identifying the problem.


Kind regards,

T. Gau


André Warnier schrieb am 05.08.2010 01:08:
> T. Gau wrote:
>>  Hello,
>>
>> the CLOSE_WAIT connections are persistent (waiting 10+min now). The 
>> FIN_WAIT counterparts from the browser disapear after some time.
>>
>> As a reminder: The Tomcat installation is "untouched". No 
>> configuration and no deployed applications besides these allready 
>> packaged with Tomcat.
>>
>>
>
> Ok. But from the netstat dislay below, it looks as if a number of 
> processes *local to the server* and with PID's 2049,2050,1992,1991 
> etc.. /have/ connected to Tomcat on port 8080.
> What are these processes, and are they still alive when you take this 
> netstat screenshot ?
>
> Can you briefly remind us of what kind of request to Tomcat these 
> clients are issuing, and what happens in them while they wait/don't 
> wait for a response ?
>
> (A long time ago, I got some "ps.exe" program - probably in a 
> Windows/NT Toolkit - which is easier than the Task Manager to look 
> this up and cut/paste.
> Apparently still available in some form : 
> http://technet.microsoft.com/en-us/sysinternals/bb795532.aspx
> )
>
>
>
>> Kind regards,
>>
>> T. Gau
>>
>>
>> André Warnier schrieb am 04.08.2010 23:11:
>>> Hi T.
>>>
>>> T. Gau wrote:
>>>>  Hello,
>>>>
>>>> I have executed 'netstat -anopb tcp' with the following result:
>>>> TCP    0.0.0.0:8009           0.0.0.0:0              
>>>> LISTENING        3436    [java.exe]
>>>> TCP    0.0.0.0:8080           0.0.0.0:0              
>>>> LISTENING        3436    [java.exe]
>>>> TCP    127.0.0.1:8005         0.0.0.0:0              
>>>> LISTENING        3436      [java.exe]
>>>>
>>>> I could not find another listening port for java.exe.
>>>
>>> The above is perfectly normal and classical.  It shows
>>> - a listening port 8080, for the HTTP Connector
>>> - a listening port 8009, for the AJP Connector
>>> - a listening port 8005, for the Tomcat shutdown connector
>>>
>>>
>>>>
>>>> BUT the requests to the frozen Tomcat results into
>>>> TCP    127.0.0.1:8080         127.0.0.1:2049         CLOSE_WAIT    
>>>> 3436    [java.exe]
>>>> TCP    127.0.0.1:8080         127.0.0.1:2050         CLOSE_WAIT    
>>>> 3436    [java.exe]
>>>> TCP    127.0.0.1:8080         127.0.0.1:1992         CLOSE_WAIT    
>>>> 3436    [java.exe]
>>>> TCP    127.0.0.1:8080         127.0.0.1:1991         CLOSE_WAIT    
>>>> 3436    [java.exe]
>>>> TCP    127.0.0.1:8080         127.0.0.1:2051         CLOSE_WAIT    
>>>> 3436    [java.exe]
>>>> TCP    127.0.0.1:8080         127.0.0.1:1990         CLOSE_WAIT    
>>>> 3436    [java.exe]
>>>> TCP    127.0.0.1:8080         127.0.0.1:1989         CLOSE_WAIT    
>>>> 3436    [java.exe]
>>>> TCP    127.0.0.1:8080         127.0.0.1:2043         CLOSE_WAIT    
>>>> 3436    [java.exe]
>>>> TCP    127.0.0.1:8080         127.0.0.1:2042         CLOSE_WAIT    
>>>> 3436    [java.exe]
>>>> Any ideas what happens here?
>>>>
>>>
>>> That is more interesting. If the situation above is transitory (just 
>>> lasts a few seconds), then it might be normal.  If the situation 
>>> above persists for a long tine, then it shows that Tomcat (or 
>>> something within Tomcat) is not properly closing its end of client 
>>> sockets, and that the objects containing these sockets are lingering 
>>> on the Heap, waiting to be collected.
>>> I'm sure someone else on this list could suggest a scenario where a 
>>> badly-behaved application could achieve this.
>>> (or a very large keepAlive setting ?)


---------------------------------------------------------------------
To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
For additional commands, e-mail: users-help@tomcat.apache.org


Mime
View raw message