Some additional information.. in Cataling Log we can see:
SCHWERWIEGEND: Error allocating socket processor
java.lang.OutOfMemoryError: unable to create new native thread
 at java.lang.Thread.start0(Native Method)
 at java.lang.Thread.start(Thread.java:597)
 at org.apache.tomcat.util.net.AprEndpoint$Worker.start(AprEndpoint.java:1550)
 at org.apache.tomcat.util.net.AprEndpoint.newWorkerThread(AprEndpoint.java:981)
 at 
org.apache.tomcat.util.net.AprEndpoint.createWorkerThread(AprEndpoint.java:960)
 at org.apache.tomcat.util.net.AprEndpoint.getWorkerThread(AprEndpoint.java:992)
 at 
org.apache.tomcat.util.net.AprEndpoint.processSocketWithOptions(AprEndpoint.java:1045)
 at org.apache.tomcat.util.net.AprEndpoint$Acceptor.run(AprEndpoint.java:1130)
 at java.lang.Thread.run(Thread.java:619)
04.02.2010 21:20:52 org.apache.tomcat.util.net.AprEndpoint 
processSocketWithOptions

starting at the same time of 502 error....

Greetings
Alexander

________________________________________
Von: Alexander Diedler [adied...@tecracer.de]
Gesendet: Freitag, 5. Februar 2010 12:36
An: users@tomcat.apache.org
Betreff: Missing files for mod_jk

Hello,
We connect an apache 2.2.14 to a Tomcat 6.0.20. From time to time our cluster 
throws 502 in the Apache Accesslog.
everything is ok-...
xxx.xxx.108.1 - - [04/Feb/2010:21:16:57 +0100] "GET 
/public/frame_doc_index.html?med_id=1000019638 HTTP/1.1" 200 771
xxx.xxx.108.1 - - [04/Feb/2010:21:16:58 +0100] "GET /public/frame_doc_top.html 
HTTP/1.1" 304 -
xxx.xxx.108.1 - - [04/Feb/2010:21:16:58 +0100] "GET 
/img_aes/Header_doc_public.jpg HTTP/1.1" 304 -
xxx.xxx.108.1 - - [04/Feb/2010:21:16:59 +0100] "GET 
/public/frame_doc_index.html?med_id=1000019638 HTTP/1.1" 304 -
xxx.xxx.108.1 - - [04/Feb/2010:21:16:59 +0100] "GET /public/frame_doc_top.html 
HTTP/1.1" 304 -
[...]
xxx.xxx.214.132 - - [04/Feb/2010:21:21:33 +0100] "GET / HTTP/1.1" 502 232
xxx.xxx.0.149 - - [04/Feb/2010:21:21:40 +0100] "GET /favicon.ico HTTP/1.1" 502 
232
xxx.xxx.193.66 - - [04/Feb/2010:21:21:41 +0100] "GET / HTTP/1.0" 502 232
[...]
Until I restart the Tomcat webserver.
Where is the place to findout, what happens in this case of error?

Greetings
Alexander
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