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From Roberto Bottoni <r.bott...@afterbit.com>
Subject Could not find worker with name 'ajp13_worker'
Date Tue, 26 Nov 2019 14:58:43 GMT
Hello,

I have a Debian 10 server with Apache 2 + Tomcat 9. I can't run JSF 
pages due to an internal server error. I use OpenJDK v. 11, also use the 
Apache Tomcat Native library [1.2.23] (tomcat-native-1.2.23-src.tar.gz) 
using the APR version [1.7.0] (apr-1.7.0.tar.gz). Tomcat starts 
regularly and also Apache.

If I open : http://www.mydomain.com

i get
Internal Server Error
The server encountered an internal error or misconfiguration and was 
unable to complete your request.... etc.. etc..

the site should be display the current date and time, but if I do :

http://www.mydomain.com:8080 i see the page correctly!


I think the error is in the Apache Tomcat connector (libapache2-mod-jk 
installed with "aptitude" command) ..


This is my workers.properties file :


         # workers.properties -
     #
     # This file is a simplified version of the workers.properties 
supplied
     # with the upstream sources. The jni inprocess worker (not build in 
the
     # debian package) section and the ajp12 (deprecated) section are 
removed.
     #
     # As a general note, the characters $( and ) are used internally to 
define
     # macros. Do not use them in your own configuration!!!
     #
     # Whenever you see a set of lines such as:
     # x=value
     # y=$(x)\something
     #
     # the final value for y will be value\something
     #
     # Normaly all you will need to do is un-comment and modify the first 
three
     # properties, i.e. workers.tomcat_home, workers.java_home and ps.
     # Most of the configuration is derived from these.
     #
     # When you are done updating workers.tomcat_home, workers.java_home 
and ps
     # you should have 3 workers configured:
     #
     # - An ajp13 worker that connects to localhost:8009
     # - A load balancer worker
     #
     #

     # OPTIONS ( very important for jni mode )

     #
     # workers.tomcat_home should point to the location where you
     # installed tomcat. This is where you have your conf, webapps and 
lib
     # directories.
     #
     workers.tomcat_home=/usr/share/tomcat9

     #
     # workers.java_home should point to your Java installation. Normally
     # you should have a bin and lib directories beneath it.
     #

     workers.java_home=/usr/lib/jvm/java-11-openjdk-amd64

     #
     # You should configure your environment slash... ps=\ on NT and / on 
UNIX
     # and maybe something different elsewhere.
     #
     ps=/

     #
     #------ ADVANCED MODE 
------------------------------------------------
     
#---------------------------------------------------------------------
     #

     #
     #------ worker list ------------------------------------------
     
#---------------------------------------------------------------------
     #
     #
     # The workers that your plugins should create and work with
     #
     worker.list=ajp13_worker

     #
     #------ ajp13_worker WORKER DEFINITION 
------------------------------
     
#---------------------------------------------------------------------
     #

     #
     # Defining a worker named ajp13_worker and of type ajp13
     # Note that the name and the type do not have to match.
     #
     worker.ajp13_worker.port=8009
     worker.ajp13_worker.host=localhost
     worker.ajp13_worker.type=ajp13
     #
     # Specifies the load balance factor when used with
     # a load balancing worker.
     # Note:
     #  ----> lbfactor must be > 0
     #  ----> Low lbfactor means less work done by the worker.
     worker.ajp13_worker.lbfactor=1

     #
     # Specify the size of the open connection cache.
     #worker.ajp13_worker.cachesize

     #
     #------ DEFAULT LOAD BALANCER WORKER DEFINITION 
----------------------
     
#---------------------------------------------------------------------
     #

     #
     # The loadbalancer (type lb) workers perform wighted round-robin
     # load balancing with sticky sessions.
     # Note:
     #  ----> If a worker dies, the load balancer will check its state
     #        once in a while. Until then all work is redirected to peer
     #        workers.
     worker.loadbalancer.type=lb
     worker.loadbalancer.balance_workers=ajp13_worker



and this is my httpd-jk.conf (loaded by Apache) file :


# Licensed to the Apache Software Foundation (ASF) under one or more
     # contributor license agreements.  See the NOTICE file distributed 
with
     # this work for additional information regarding copyright 
ownership.
     # The ASF licenses this file to You under the Apache License, 
Version 2.0
     # (the "License"); you may not use this file except in compliance 
with
     # the License.  You may obtain a copy of the License at
     #
     #     http://www.apache.org/licenses/LICENSE-2.0
     #
     # Unless required by applicable law or agreed to in writing, 
software
     # distributed under the License is distributed on an "AS IS" BASIS,
     # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or 
implied.
     # See the License for the specific language governing permissions 
and
     # limitations under the License.

     # Configuration Example for mod_jk
     # used in combination with Apache 2.2.x

     <IfModule jk_module>

         # We need a workers file exactly once
         # and in the global server
         JkWorkersFile /etc/libapache2-mod-jk/workers.properties

         # Our JK error log
         # You can (and should) use rotatelogs here
         JkLogFile /var/log/apache2/mod_jk.log

         # Our JK log level (trace,debug,info,warn,error)
         JkLogLevel debug

         # Our JK shared memory file
         JkShmFile /var/log/apache2/jk-runtime-status

         # Define a new log format you can use in any CustomLog in order
         # to add mod_jk specific information to your access log.
         # LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" 
\"%{User-Agent}i\" \"%{Cookie}i\" \"%{Set-Cookie}o\" %{pid}P %{tid}P 
%{JK_LB_FIRST_NAME}n %{JK_LB_LAST_NAME}n ACC %{JK_LB_LAST_ACCESSED}n ERR 
%{JK_LB_LAST_ERRORS}n BSY %{JK_LB_LAST_BUSY}n %{JK_LB_LAST_STATE}n %D" 
extended_jk

         # This option will reject all requests, which contain an
         # encoded percent sign (%25) or backslash (%5C) in the URL
         # If you are sure, that your webapp doesn't use such
         # URLs, enable the option to prevent double encoding attacks.
         # Since: 1.2.24
         # JkOptions +RejectUnsafeURI

         # After setting JkStripSession to "On", mod_jk will
         # strip all ";jsessionid=..." from request URLs it
         # does *not* forward to a backend.
         # This is useful, if all links in a webapp use
         # URLencoded session IDs and parts of the static
         # content should be delivered directly by Apache.
         # Of course you can also do it with mod_rewrite.
         # Since: 1.2.21
         # JkStripSession On

         # Start a separate thread for internal tasks like
         # idle connection probing, connection pool resizing
         # and load value decay.
         # Run these tasks every JkWatchdogInterval seconds.
         # Since: 1.2.27
         JkWatchdogInterval 60

         # Configure access to jk-status and jk-manager
         # If you want to make this available in a virtual host,
         # either move this block into the virtual host
         # or copy it logically there by including "JkMountCopy On"
         # in the virtual host.
         # Add an appropriate authentication method here!
         <Location /jk-status>
             # Inside Location we can omit the URL in JkMount
             JkMount jk-status
             Require ip 127.0.0.1
         </Location>
         <Location /jk-manager>
             # Inside Location we can omit the URL in JkMount
             JkMount jk-manager
             Require ip 127.0.0.1
         </Location>

         # If you want to put all mounts into an external file
         # that gets reloaded automatically after changes
         # (with a default latency of 1 minute),
         # you can define the name of the file here.
         # JkMountFile conf/extra/uriworkermap.properties

         # Example for Mounting a context to the worker "balancer"
         # The URL syntax "a|b" instantiates two mounts at once,
         # the first one is "a", the second one is "ab".
         # JkMount /myapp|/* balancer

         # Example for UnMounting requests for all workers
         # using a simple URL pattern
         # Since: 1.2.26
         # JkUnMount /myapp/static/* *

         # Example for UnMounting requests for a named worker
         # JkUnMount /myapp/images/* balancer

         # Example for UnMounting requests using regexps
         # SetEnvIf REQUEST_URI "\.(htm|html|css|gif|jpg|js)$" no-jk

         # Example for setting a reply timeout depending on the request 
URL
         # Since: 1.2.27
         # SetEnvIf Request_URI "/transactions/" JK_REPLY_TIMEOUT=600000

         # Example for disabling reply timeouts for certain request URLs
         # Since: 1.2.27
         # SetEnvIf Request_URI "/reports/" JK_REPLY_TIMEOUT=0

         # IMPORTANT: Mounts and virtual hosts
         # If you are using VirtualHost elements, you
         # - can put mounts only used in some virtual host into its 
VirtualHost element
         # - can copy all global mounts to it using "JkMountCopy On" 
inside the VirtualHost
         # - can copy all global mounts to all virtual hosts by putting
         #   "JkMountCopy All" into the global server
         # Since: 1.2.26

     </IfModule>


This is my mod_jk.log log file (I replaced my real domain with 
www.mydomain.com)

[Mon Nov 25 16:40:11.684 2019] [1914:140619718063232] [debug] 
jk_set_time_fmt::jk_util.c (487): Pre-processed log time stamp format is 
'[%a %b %d %H:%M:%S.000 %Y] '
     [Mon Nov 25 16:40:11.684 2019] [1914:140619718063232] [debug] 
dump_options::mod_jk.c (678): JkOption 'ForwardURIProxy' set in server 
'www.mydomain.com [*:80]' (default)
     [Mon Nov 25 16:40:11.684 2019] [1914:140619718063232] [debug] 
dump_options::mod_jk.c (698): JkOption 'ForwardKeySize' set in server 
'www.mydomain.com [*:80]' (default)
     [Mon Nov 25 16:40:11.684 2019] [1914:140619718063232] [debug] 
uri_worker_map_open::jk_uri_worker_map.c (898): rule map size is 1
     [Mon Nov 25 16:40:11.684 2019] [1914:140619718063232] [debug] 
uri_worker_map_add::jk_uri_worker_map.c (848): wildchar rule 
'/*=ajp13_worker' source 'JkMount' was added
     [Mon Nov 25 16:40:11.684 2019] [1914:140619718063232] [debug] 
uri_worker_map_dump::jk_uri_worker_map.c (178): uri map dump after map 
open: id=0, index=0 file='(null)' reject_unsafe=0 reload=60 modified=0 
checked=0
     [Mon Nov 25 16:40:11.684 2019] [1914:140619718063232] [debug] 
uri_worker_map_dump::jk_uri_worker_map.c (184): generation 0: size=0 
nosize=0 capacity=0
     [Mon Nov 25 16:40:11.684 2019] [1914:140619718063232] [debug] 
uri_worker_map_dump::jk_uri_worker_map.c (184): generation 1: size=1 
nosize=0 capacity=4
     [Mon Nov 25 16:40:11.684 2019] [1914:140619718063232] [debug] 
uri_worker_map_dump::jk_uri_worker_map.c (197): NEXT (1) map #0: uri=/* 
worker=ajp13_worker context=/* source=JkMount type=Wildchar len=2
     [Mon Nov 25 16:40:11.684 2019] [1914:140619718063232] [info] 
init_jk::mod_jk.c (3591): mod_jk/1.2.46 initialized
     [Mon Nov 25 16:40:11.684 2019] [1914:140619718063232] [debug] 
wc_get_worker_for_name::jk_worker.c (120): did not find a worker 
ajp13_worker
     [Mon Nov 25 16:40:11.684 2019] [1914:140619718063232] [error] 
extension_fix::jk_uri_worker_map.c (580): Could not find worker with 
name 'ajp13_worker' in uri map post processing.
     [Mon Nov 25 16:40:11.684 2019] [1914:140619718063232] [debug] 
uri_worker_map_dump::jk_uri_worker_map.c (178): uri map dump after 
extension stripping: id=2, index=0 file='(null)' reject_unsafe=0 
reload=60 modified=0 checked=0
     [Mon Nov 25 16:40:11.684 2019] [1914:140619718063232] [debug] 
uri_worker_map_dump::jk_uri_worker_map.c (184): generation 0: size=0 
nosize=0 capacity=0
     [Mon Nov 25 16:40:11.684 2019] [1914:140619718063232] [debug] 
uri_worker_map_dump::jk_uri_worker_map.c (184): generation 1: size=1 
nosize=0 capacity=4
     [Mon Nov 25 16:40:11.684 2019] [1914:140619718063232] [debug] 
uri_worker_map_dump::jk_uri_worker_map.c (197): NEXT (1) map #0: uri=/* 
worker=ajp13_worker context=/* source=JkMount type=Wildchar len=2
     [Mon Nov 25 16:40:11.684 2019] [1914:140619718063232] [debug] 
uri_worker_map_switch::jk_uri_worker_map.c (602): Switching uri worker 
map from index 0 to index 1
     [Mon Nov 25 16:40:11.690 2019] [1915:140619718063232] [debug] 
jk_set_time_fmt::jk_util.c (487): Pre-processed log time stamp format is 
'[%a %b %d %H:%M:%S.000 %Y] '
     [Mon Nov 25 16:40:11.690 2019] [1915:140619718063232] [debug] 
dump_options::mod_jk.c (678): JkOption 'ForwardURIProxy' set in server 
'www.mydomain.com [*:80]' (default)
     [Mon Nov 25 16:40:11.690 2019] [1915:140619718063232] [debug] 
dump_options::mod_jk.c (698): JkOption 'ForwardKeySize' set in server 
'www.mydomain.com [*:80]' (default)
     [Mon Nov 25 16:40:11.690 2019] [1915:140619718063232] [debug] 
uri_worker_map_open::jk_uri_worker_map.c (898): rule map size is 1
     [Mon Nov 25 16:40:11.690 2019] [1915:140619718063232] [debug] 
uri_worker_map_add::jk_uri_worker_map.c (848): wildchar rule 
'/*=ajp13_worker' source 'JkMount' was added
     [Mon Nov 25 16:40:11.690 2019] [1915:140619718063232] [debug] 
uri_worker_map_dump::jk_uri_worker_map.c (178): uri map dump after map 
open: id=0, index=0 file='(null)' reject_unsafe=0 reload=60 modified=0 
checked=0
     [Mon Nov 25 16:40:11.690 2019] [1915:140619718063232] [debug] 
uri_worker_map_dump::jk_uri_worker_map.c (184): generation 0: size=0 
nosize=0 capacity=0
     [Mon Nov 25 16:40:11.690 2019] [1915:140619718063232] [debug] 
uri_worker_map_dump::jk_uri_worker_map.c (184): generation 1: size=1 
nosize=0 capacity=4
     [Mon Nov 25 16:40:11.690 2019] [1915:140619718063232] [debug] 
uri_worker_map_dump::jk_uri_worker_map.c (197): NEXT (1) map #0: uri=/* 
worker=ajp13_worker context=/* source=JkMount type=Wildchar len=2
     [Mon Nov 25 16:40:11.691 2019] [1915:140619718063232] [info] 
init_jk::mod_jk.c (3591): mod_jk/1.2.46 initialized
     [Mon Nov 25 16:40:11.691 2019] [1915:140619718063232] [debug] 
wc_get_worker_for_name::jk_worker.c (120): did not find a worker 
ajp13_worker
     [Mon Nov 25 16:40:11.691 2019] [1915:140619718063232] [error] 
extension_fix::jk_uri_worker_map.c (580): Could not find worker with 
name 'ajp13_worker' in uri map post processing.
     [Mon Nov 25 16:40:11.691 2019] [1915:140619718063232] [debug] 
uri_worker_map_dump::jk_uri_worker_map.c (178): uri map dump after 
extension stripping: id=2, index=0 file='(null)' reject_unsafe=0 
reload=60 modified=0 checked=0
     [Mon Nov 25 16:40:11.691 2019] [1915:140619718063232] [debug] 
uri_worker_map_dump::jk_uri_worker_map.c (184): generation 0: size=0 
nosize=0 capacity=0
     [Mon Nov 25 16:40:11.691 2019] [1915:140619718063232] [debug] 
uri_worker_map_dump::jk_uri_worker_map.c (184): generation 1: size=1 
nosize=0 capacity=4
     [Mon Nov 25 16:40:11.691 2019] [1915:140619718063232] [debug] 
uri_worker_map_dump::jk_uri_worker_map.c (197): NEXT (1) map #0: uri=/* 
worker=ajp13_worker context=/* source=JkMount type=Wildchar len=2
     [Mon Nov 25 16:40:11.691 2019] [1915:140619718063232] [debug] 
uri_worker_map_switch::jk_uri_worker_map.c (602): Switching uri worker 
map from index 0 to index 1


the VirtualHost in Apache is :

<VirtualHost *:80>
     DocumentRoot "/var/www/vhosts/www.mydomain.com/ROOT"
     ServerName www.mydomain.com
     ServerAdmin info@mydomain.com

     JkMount /* ajp13_worker
     JkLogLevel debug


     <Directory "/var/www/vhosts/www.mydomain.com/ROOT">
     allow from all
     Options None
     Require all granted
     </Directory>
     </VirtualHost>




I have a new Debian 10 server with Apache 2 + Tomcat 9. I can't run the 
JSF page due to an internal server error. I think the error is in the 
Apache Tomcat connector (libapache2-mod-jk) ..

I use OpenJDK v. 11, I also use the Apache Tomcat Native library 
[1.2.23] using the APR version [1.7.0]. Tomcat runs regularly and also 
Apache.

This is my workers.properties file :

         # workers.properties -
     #
     # This file is a simplified version of the workers.properties 
supplied
     # with the upstream sources. The jni inprocess worker (not build in 
the
     # debian package) section and the ajp12 (deprecated) section are 
removed.
     #
     # As a general note, the characters $( and ) are used internally to 
define
     # macros. Do not use them in your own configuration!!!
     #
     # Whenever you see a set of lines such as:
     # x=value
     # y=$(x)\something
     #
     # the final value for y will be value\something
     #
     # Normaly all you will need to do is un-comment and modify the first 
three
     # properties, i.e. workers.tomcat_home, workers.java_home and ps.
     # Most of the configuration is derived from these.
     #
     # When you are done updating workers.tomcat_home, workers.java_home 
and ps
     # you should have 3 workers configured:
     #
     # - An ajp13 worker that connects to localhost:8009
     # - A load balancer worker
     #
     #

     # OPTIONS ( very important for jni mode )

     #
     # workers.tomcat_home should point to the location where you
     # installed tomcat. This is where you have your conf, webapps and 
lib
     # directories.
     #
     workers.tomcat_home=/usr/share/tomcat9

     #
     # workers.java_home should point to your Java installation. Normally
     # you should have a bin and lib directories beneath it.
     #

     workers.java_home=/usr/lib/jvm/java-11-openjdk-amd64

     #
     # You should configure your environment slash... ps=\ on NT and / on 
UNIX
     # and maybe something different elsewhere.
     #
     ps=/

     #
     #------ ADVANCED MODE 
------------------------------------------------
     
#---------------------------------------------------------------------
     #

     #
     #------ worker list ------------------------------------------
     
#---------------------------------------------------------------------
     #
     #
     # The workers that your plugins should create and work with
     #
     worker.list=ajp13_worker

     #
     #------ ajp13_worker WORKER DEFINITION 
------------------------------
     
#---------------------------------------------------------------------
     #

     #
     # Defining a worker named ajp13_worker and of type ajp13
     # Note that the name and the type do not have to match.
     #
     worker.ajp13_worker.port=8009
     worker.ajp13_worker.host=localhost
     worker.ajp13_worker.type=ajp13
     #
     # Specifies the load balance factor when used with
     # a load balancing worker.
     # Note:
     #  ----> lbfactor must be > 0
     #  ----> Low lbfactor means less work done by the worker.
     worker.ajp13_worker.lbfactor=1

     #
     # Specify the size of the open connection cache.
     #worker.ajp13_worker.cachesize

     #
     #------ DEFAULT LOAD BALANCER WORKER DEFINITION 
----------------------
     
#---------------------------------------------------------------------
     #

     #
     # The loadbalancer (type lb) workers perform wighted round-robin
     # load balancing with sticky sessions.
     # Note:
     #  ----> If a worker dies, the load balancer will check its state
     #        once in a while. Until then all work is redirected to peer
     #        workers.
     worker.loadbalancer.type=lb
     worker.loadbalancer.balance_workers=ajp13_worker
and this is my httpd-jk.conf file :

         # Licensed to the Apache Software Foundation (ASF) under one or 
more
     # contributor license agreements.  See the NOTICE file distributed 
with
     # this work for additional information regarding copyright 
ownership.
     # The ASF licenses this file to You under the Apache License, 
Version 2.0
     # (the "License"); you may not use this file except in compliance 
with
     # the License.  You may obtain a copy of the License at
     #
     #     http://www.apache.org/licenses/LICENSE-2.0
     #
     # Unless required by applicable law or agreed to in writing, 
software
     # distributed under the License is distributed on an "AS IS" BASIS,
     # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or 
implied.
     # See the License for the specific language governing permissions 
and
     # limitations under the License.

     # Configuration Example for mod_jk
     # used in combination with Apache 2.2.x

     <IfModule jk_module>

         # We need a workers file exactly once
         # and in the global server
         JkWorkersFile /etc/libapache2-mod-jk/workers.properties

         # Our JK error log
         # You can (and should) use rotatelogs here
         JkLogFile /var/log/apache2/mod_jk.log

         # Our JK log level (trace,debug,info,warn,error)
         JkLogLevel debug

         # Our JK shared memory file
         JkShmFile /var/log/apache2/jk-runtime-status

         # Define a new log format you can use in any CustomLog in order
         # to add mod_jk specific information to your access log.
         # LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" 
\"%{User-Agent}i\" \"%{Cookie}i\" \"%{Set-Cookie}o\" %{pid}P %{tid}P 
%{JK_LB_FIRST_NAME}n %{JK_LB_LAST_NAME}n ACC %{JK_LB_LAST_ACCESSED}n ERR 
%{JK_LB_LAST_ERRORS}n BSY %{JK_LB_LAST_BUSY}n %{JK_LB_LAST_STATE}n %D" 
extended_jk

         # This option will reject all requests, which contain an
         # encoded percent sign (%25) or backslash (%5C) in the URL
         # If you are sure, that your webapp doesn't use such
         # URLs, enable the option to prevent double encoding attacks.
         # Since: 1.2.24
         # JkOptions +RejectUnsafeURI

         # After setting JkStripSession to "On", mod_jk will
         # strip all ";jsessionid=..." from request URLs it
         # does *not* forward to a backend.
         # This is useful, if all links in a webapp use
         # URLencoded session IDs and parts of the static
         # content should be delivered directly by Apache.
         # Of course you can also do it with mod_rewrite.
         # Since: 1.2.21
         # JkStripSession On

         # Start a separate thread for internal tasks like
         # idle connection probing, connection pool resizing
         # and load value decay.
         # Run these tasks every JkWatchdogInterval seconds.
         # Since: 1.2.27
         JkWatchdogInterval 60

         # Configure access to jk-status and jk-manager
         # If you want to make this available in a virtual host,
         # either move this block into the virtual host
         # or copy it logically there by including "JkMountCopy On"
         # in the virtual host.
         # Add an appropriate authentication method here!
         <Location /jk-status>
             # Inside Location we can omit the URL in JkMount
             JkMount jk-status
             Require ip 127.0.0.1
         </Location>
         <Location /jk-manager>
             # Inside Location we can omit the URL in JkMount
             JkMount jk-manager
             Require ip 127.0.0.1
         </Location>

         # If you want to put all mounts into an external file
         # that gets reloaded automatically after changes
         # (with a default latency of 1 minute),
         # you can define the name of the file here.
         # JkMountFile conf/extra/uriworkermap.properties

         # Example for Mounting a context to the worker "balancer"
         # The URL syntax "a|b" instantiates two mounts at once,
         # the first one is "a", the second one is "ab".
         # JkMount /myapp|/* balancer

         # Example for UnMounting requests for all workers
         # using a simple URL pattern
         # Since: 1.2.26
         # JkUnMount /myapp/static/* *

         # Example for UnMounting requests for a named worker
         # JkUnMount /myapp/images/* balancer

         # Example for UnMounting requests using regexps
         # SetEnvIf REQUEST_URI "\.(htm|html|css|gif|jpg|js)$" no-jk

         # Example for setting a reply timeout depending on the request 
URL
         # Since: 1.2.27
         # SetEnvIf Request_URI "/transactions/" JK_REPLY_TIMEOUT=600000

         # Example for disabling reply timeouts for certain request URLs
         # Since: 1.2.27
         # SetEnvIf Request_URI "/reports/" JK_REPLY_TIMEOUT=0

         # IMPORTANT: Mounts and virtual hosts
         # If you are using VirtualHost elements, you
         # - can put mounts only used in some virtual host into its 
VirtualHost element
         # - can copy all global mounts to it using "JkMountCopy On" 
inside the VirtualHost
         # - can copy all global mounts to all virtual hosts by putting
         #   "JkMountCopy All" into the global server
         # Since: 1.2.26

     </IfModule>
This is my mod_jk.log log file (I replaced my real domain with 
www.mydomain.com)

     [Mon Nov 25 16:40:11.684 2019] [1914:140619718063232] [debug] 
jk_set_time_fmt::jk_util.c (487): Pre-processed log time stamp format is 
'[%a %b %d %H:%M:%S.000 %Y] '
     [Mon Nov 25 16:40:11.684 2019] [1914:140619718063232] [debug] 
dump_options::mod_jk.c (678): JkOption 'ForwardURIProxy' set in server 
'www.mydomain.com [*:80]' (default)
     [Mon Nov 25 16:40:11.684 2019] [1914:140619718063232] [debug] 
dump_options::mod_jk.c (698): JkOption 'ForwardKeySize' set in server 
'www.mydomain.com [*:80]' (default)
     [Mon Nov 25 16:40:11.684 2019] [1914:140619718063232] [debug] 
uri_worker_map_open::jk_uri_worker_map.c (898): rule map size is 1
     [Mon Nov 25 16:40:11.684 2019] [1914:140619718063232] [debug] 
uri_worker_map_add::jk_uri_worker_map.c (848): wildchar rule 
'/*=ajp13_worker' source 'JkMount' was added
     [Mon Nov 25 16:40:11.684 2019] [1914:140619718063232] [debug] 
uri_worker_map_dump::jk_uri_worker_map.c (178): uri map dump after map 
open: id=0, index=0 file='(null)' reject_unsafe=0 reload=60 modified=0 
checked=0
     [Mon Nov 25 16:40:11.684 2019] [1914:140619718063232] [debug] 
uri_worker_map_dump::jk_uri_worker_map.c (184): generation 0: size=0 
nosize=0 capacity=0
     [Mon Nov 25 16:40:11.684 2019] [1914:140619718063232] [debug] 
uri_worker_map_dump::jk_uri_worker_map.c (184): generation 1: size=1 
nosize=0 capacity=4
     [Mon Nov 25 16:40:11.684 2019] [1914:140619718063232] [debug] 
uri_worker_map_dump::jk_uri_worker_map.c (197): NEXT (1) map #0: uri=/* 
worker=ajp13_worker context=/* source=JkMount type=Wildchar len=2
     [Mon Nov 25 16:40:11.684 2019] [1914:140619718063232] [info] 
init_jk::mod_jk.c (3591): mod_jk/1.2.46 initialized
     [Mon Nov 25 16:40:11.684 2019] [1914:140619718063232] [debug] 
wc_get_worker_for_name::jk_worker.c (120): did not find a worker 
ajp13_worker
     [Mon Nov 25 16:40:11.684 2019] [1914:140619718063232] [error] 
extension_fix::jk_uri_worker_map.c (580): Could not find worker with 
name 'ajp13_worker' in uri map post processing.
     [Mon Nov 25 16:40:11.684 2019] [1914:140619718063232] [debug] 
uri_worker_map_dump::jk_uri_worker_map.c (178): uri map dump after 
extension stripping: id=2, index=0 file='(null)' reject_unsafe=0 
reload=60 modified=0 checked=0
     [Mon Nov 25 16:40:11.684 2019] [1914:140619718063232] [debug] 
uri_worker_map_dump::jk_uri_worker_map.c (184): generation 0: size=0 
nosize=0 capacity=0
     [Mon Nov 25 16:40:11.684 2019] [1914:140619718063232] [debug] 
uri_worker_map_dump::jk_uri_worker_map.c (184): generation 1: size=1 
nosize=0 capacity=4
     [Mon Nov 25 16:40:11.684 2019] [1914:140619718063232] [debug] 
uri_worker_map_dump::jk_uri_worker_map.c (197): NEXT (1) map #0: uri=/* 
worker=ajp13_worker context=/* source=JkMount type=Wildchar len=2
     [Mon Nov 25 16:40:11.684 2019] [1914:140619718063232] [debug] 
uri_worker_map_switch::jk_uri_worker_map.c (602): Switching uri worker 
map from index 0 to index 1
     [Mon Nov 25 16:40:11.690 2019] [1915:140619718063232] [debug] 
jk_set_time_fmt::jk_util.c (487): Pre-processed log time stamp format is 
'[%a %b %d %H:%M:%S.000 %Y] '
     [Mon Nov 25 16:40:11.690 2019] [1915:140619718063232] [debug] 
dump_options::mod_jk.c (678): JkOption 'ForwardURIProxy' set in server 
'www.mydomain.com [*:80]' (default)
     [Mon Nov 25 16:40:11.690 2019] [1915:140619718063232] [debug] 
dump_options::mod_jk.c (698): JkOption 'ForwardKeySize' set in server 
'www.mydomain.com [*:80]' (default)
     [Mon Nov 25 16:40:11.690 2019] [1915:140619718063232] [debug] 
uri_worker_map_open::jk_uri_worker_map.c (898): rule map size is 1
     [Mon Nov 25 16:40:11.690 2019] [1915:140619718063232] [debug] 
uri_worker_map_add::jk_uri_worker_map.c (848): wildchar rule 
'/*=ajp13_worker' source 'JkMount' was added
     [Mon Nov 25 16:40:11.690 2019] [1915:140619718063232] [debug] 
uri_worker_map_dump::jk_uri_worker_map.c (178): uri map dump after map 
open: id=0, index=0 file='(null)' reject_unsafe=0 reload=60 modified=0 
checked=0
     [Mon Nov 25 16:40:11.690 2019] [1915:140619718063232] [debug] 
uri_worker_map_dump::jk_uri_worker_map.c (184): generation 0: size=0 
nosize=0 capacity=0
     [Mon Nov 25 16:40:11.690 2019] [1915:140619718063232] [debug] 
uri_worker_map_dump::jk_uri_worker_map.c (184): generation 1: size=1 
nosize=0 capacity=4
     [Mon Nov 25 16:40:11.690 2019] [1915:140619718063232] [debug] 
uri_worker_map_dump::jk_uri_worker_map.c (197): NEXT (1) map #0: uri=/* 
worker=ajp13_worker context=/* source=JkMount type=Wildchar len=2
     [Mon Nov 25 16:40:11.691 2019] [1915:140619718063232] [info] 
init_jk::mod_jk.c (3591): mod_jk/1.2.46 initialized
     [Mon Nov 25 16:40:11.691 2019] [1915:140619718063232] [debug] 
wc_get_worker_for_name::jk_worker.c (120): did not find a worker 
ajp13_worker
     [Mon Nov 25 16:40:11.691 2019] [1915:140619718063232] [error] 
extension_fix::jk_uri_worker_map.c (580): Could not find worker with 
name 'ajp13_worker' in uri map post processing.
     [Mon Nov 25 16:40:11.691 2019] [1915:140619718063232] [debug] 
uri_worker_map_dump::jk_uri_worker_map.c (178): uri map dump after 
extension stripping: id=2, index=0 file='(null)' reject_unsafe=0 
reload=60 modified=0 checked=0
     [Mon Nov 25 16:40:11.691 2019] [1915:140619718063232] [debug] 
uri_worker_map_dump::jk_uri_worker_map.c (184): generation 0: size=0 
nosize=0 capacity=0
     [Mon Nov 25 16:40:11.691 2019] [1915:140619718063232] [debug] 
uri_worker_map_dump::jk_uri_worker_map.c (184): generation 1: size=1 
nosize=0 capacity=4
     [Mon Nov 25 16:40:11.691 2019] [1915:140619718063232] [debug] 
uri_worker_map_dump::jk_uri_worker_map.c (197): NEXT (1) map #0: uri=/* 
worker=ajp13_worker context=/* source=JkMount type=Wildchar len=2
     [Mon Nov 25 16:40:11.691 2019] [1915:140619718063232] [debug] 
uri_worker_map_switch::jk_uri_worker_map.c (602): Switching uri worker 
map from index 0 to index 1
my Apache is :

         <VirtualHost *:80>
     DocumentRoot "/var/www/vhosts/www.mydomain.com/ROOT"
     ServerName www.mydomain.com
     ServerAdmin info@mydomain.com

     JkMount /* ajp13_worker
     JkLogLevel debug


     <Directory "/var/www/vhosts/www.mydomain.com/ROOT">
     allow from all
     Options None
     Require all granted
     </Directory>
     </VirtualHost>


So, it seems that Apache cannot find "ajp13_worker" worker..

Why?

Thanks.

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