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Reply to topic   Topic: mod_wl_22.so with Apache 2.4
Author
rinser



Joined: 08 Mar 2012
Posts: 2
Location: London

PostPosted: Thu 08 Mar '12 17:10    Post subject: mod_wl_22.so with Apache 2.4 Reply with quote

Hello

I have just upgraded Apache http server from 2.22 to 2.4. It has configured ok and the usual test returns "It works".

The Apache server is used to forward calls to our OBIEE installation and for this we use a module plugin, the mod_wl_22.so which we extract from our weblogic installation on the internal server.

This has worked fine on Apache 2.2.21 / 22.

It doesn't work on 2.4.

Starting Apache presents the following error:
Quote:

httpd: Syntax error on line 489 of /mnt/Apache/conf/httpd.conf: Cannot load /mnt/Apache/modules/mod_wl_22.so into server: /mnt/Apache/modules/mod_wl_22.so: undefined symbol: ap_log_rerror


when I try ldd I get this

Quote:
ldd -d /mnt/Apache/modules/mod_wl_22.so
libstdc++.so.5 => /usr/lib64/libstdc++.so.5 (0x00002ac1291c0000)
libm.so.6 => /lib64/libm.so.6 (0x00002ac12949b000)
libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00002ac12971e000)
libc.so.6 => /lib64/libc.so.6 (0x00002ac12992d000)
/lib64/ld-linux-x86-64.so.2 (0x00002ac128fa3000)
undefined symbol: apr_pool_cleanup_null (/mnt/Apache/modules/mod_wl_22.so)


From the documentation of 2.4:

Quote:
Many third-party modules designed for version 2.2 will otherwise work unchanged with the Apache HTTP Server version 2.4. Some will require changes; see the API update overview.


The API section does not cover this particular module.

As this release (2.4) has just been released, I am not sure how to verify if this module is ok with 2.4.

Has anyone had the same issue with mod_wl_22.so on this version of Apache?

If I cant find a resolution I will have to fail back to 2.2.22 - not ideal as we are supposed to be using the latest and greatest Apache in terms of security for this externally facing box.

httpd.conf configured the same way (maybe this is where I am going wrong) as for 2.2.22:

Code:
LoadModule weblogic_module modules/mod_wl_22.so

# This empty block is needed to save mod_wl related configuration from EM to this file when changes are made at the Base Virtual Host Level
<IfModule weblogic_module>
       SetHandler weblogic-handler
       DebugConfigInfo OFF
       Debug OFF
       # WLLogFile /tmp/weblogic.log
 #      MatchExpression *.jsp
 WebLogicHost *******.**.co.uk
 DynamicServerList Off
 WebLogicPort 9704
</IfModule>



    Versions used:

    OBIEE Oracle Business Intelligence 11.1.1.5:
    Linux x86 (64-bit)
    11.2.0.2.0 database
    Apache 2.4
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tdonovan
Moderator


Joined: 17 Dec 2005
Posts: 610
Location: Milford, MA, USA

PostPosted: Thu 08 Mar '12 22:59    Post subject: Reply with quote

This quote is not very clear about what is needed for Apache 2.4:
Quote:
Many third-party modules designed for version 2.2 will otherwise work unchanged with the Apache HTTP Server version 2.4
.
This only means that it might not be necessary to change the source code for your module. It doesn't mean that you can use your existing 2.2 binary modules (i.e. use your mod_*.so files) with Apache version 2.4. It is always necessary to re-compile the source code and create a new binary module for Apache 2.4.

It looks like Oracle (Weblogic) Plugins does not give you the source code for mod_wl_22 (or mod_wl128_22), so you may either need to:
    wait for Oracle to supply Apache 2.4 versions of these binary modules
    -or-
    ask Oracle for the module source code - so you can compile it yourself with Apache 2.4, and check if this is a module which doesn't need source code changes for 2.4.
-tom-
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rinser



Joined: 08 Mar 2012
Posts: 2
Location: London

PostPosted: Fri 09 Mar '12 14:14    Post subject: Reply with quote

Thanks for the response Tom.

I have raised an SR and will update this post if I get anything useful back from Oracle.

Regards,


update from SR:


Quote:
The FMW certification matrix shows that only Apache 2.0 and 2.2 are supported. As the upgrade to 2.4 is causing problems, you should remain on a supported platform.

http://www.oracle.com/technetwork/middleware/ias/downloads/fusion-certification-100350.html

Regards,

Michael McDonagh
Oracle Support
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