Re: Tomcat to Apache connection dies

John Moore schrieb:
> Caldarale, Charles R wrote:
>>> From: John Moore [mailto:jbm <at> microps.com] Subject: Re: Tomcat to 
>>> Apache connection dies
>>>
>>> Ok, I assume you mean the APR connector is the mod_jk.so which is on 
>>> the Apache side only.. ?
>>>     
>>
>> No - the APR connector is a replacement for the pure Java HTTP/AJP ones
>> on the Tomcat side.
>>   
> Ok, now I'm confused...
> 
> Please be patient, but in all the years past I would compile a connector 
> for mod_jk.so that is placed in the ../apache/modules directory then I 
> would add the following to the server.xml,
> 
> Server container
> 
> <Listener className="org.apache.jk.config.ApacheConfig"
>    modJk="/usr/local/apache/modules/mod_jk.so" />
> 
> 
> Host container
> 
> <Listener className="org.apache.jk.config.ApacheConfig"
>        append="true"
>    forwardAll="false"
>    modJk="/usr/local/apache/modules/mod_jk.so" />
> 
> ... and I would be up and running.. (and would touch nothing else..)
> 
> So.. given that, what "connector" am I using ??
> 
> Thank you for your patience..

We use the term connector on both sides. On the httpd side it's an httpd 
module, e.g. mod_jk. On the Tomcat side it's one of several choices one 
can decide on.

What makes the things confusing is, that you can generate a mod_jk 
configuration by using a Listener configuration on the Tomcat side. This 
Listener does not mean, that Tomcat uses mod_jk, but it tells Tomcat to 
generate a configuration for mod_jk. Once you've got a workinbg 
configuration, you can remove those Listeners. They are not really 
needed for a working connection between httpd and Tomcat.

On the Tomcat side, there are two different sets of choices for 
connectors: protocol and implementation. For the protocol you can either 
chosse http/https if you want to connect directly with the browser or 
via an http reverse proxy. Or you choose the AJP13 protocol if you want 
to connect via mod_jk or mod_proxy_ajp.

For both protocols, there exist different connector implementations on 
the Tomcat side:

- Coyote (pure java, default, one thread per connection)
- APR connector, also called tcnative (native, i.e. C based, needs to be 
compiled additionally, contains support for openssl, able to separate 
idle connections from threads)
- NIO (Tomcat 6) (pure java, also able to separate idle connections from 
threads, supports Comet)

Regards,

Rainer

httpd/mod_jk

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