# Apache Tomcat 4

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# The JK Connector

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Introduction

> The JK Connector is a web server component used to invisibly integrate Tomcat with a web server such as Apache or IIS. Communication between the web server and Tomcat is via the `JK` protocol (also known as the `AJP` protocol).

> Tomact is usually integrated with a web server in cases where you want the web server to handle the static content contained in the web application, and/or utilize the web server's SSL processing. In many application environments, this will result in better overall performance than running your applications under Tomcat stand-alone using the Coyote HTTP/1.1 Connector. However, the only way to know for sure whether it will provide better performance for your application is to try it both ways.

Configuration HOWTOs

> Apache

> > Introduction

> > > This section explains how to connect Tomcat 4 to the popular open source web server, Apache. It was originally part of Tomcat: A Minimalistic User's Guide by Gal Shachor, but has been split off for organizational reasons. It should be considered a work in progress. Since the Tomcat source tree is constantly changing, the information herein may be out of date. The only definitive reference at this point is the source code.

> > Installation

> > > Needed Components

> > > > In a nutshell a web server is waiting for client HTTP requests. When these requests arrive the server does whatever is needed to serve the requests by providing the necessary content. Adding a servlet container may somewhat change this behavior. Now the web server needs also to perform the following:

> > > > - Load the servlet container adapter library and initialize it (prior to serving requests).
> > > > - When a request arrives, it needs to check and see if a certain request belongs to a servlet, if so it needs to let the adapter take the request and handle it.

> > > > The adapter on the other hand needs to know what requests it is going to serve, usually based on some pattern in the request URL, and to where to direct these requests.

> > > > Things are even more complex when the user wants to set a configuration that uses virtual hosts, or when they want multiple developers to work on the same web server but on different servlet container JVMs. We will cover these two cases in the advanced sections.

> > > mod_jk Terminology

> > > > The following terms are used in this section:

> > > > - Worker process - A worker is a Tomcat instance that is running to serve servlet requests coming from the web server. In most cases there is only a single worker (the one and only Tomcat process) but sometimes you will run multiple workers to achieve load balancing or site partitioning. Each worker is identified to the web server by the host were it is located, the port where it listens and the communication protocol used to exchange messages.
> > > > - In-Process Worker - This is a special worker. Instead of working with a Tomcat process residing on another process, the web server opens a JVM and executes Tomcat inside the web server process address space. Our discussion in this document is not going to get into this special worker. Note: Tomcat 4 can't be run as this type of worker at the moment.
> > > > - Web Server Plug-in/Tomcat Redirector - For Tomcat to cooperate with any web server it needs an "agent" to reside in the web server and send Tomcat servlet requests. This is the web server plug-in, and in our case the web server plug-in is mod_jk. The redirector usually comes in the shape of a DLL or shared object module that you plug into the web server.
> > > > - Plug-in Configuration - We need to configure the web server plug-in so that it knows where the different Tomcat workers are and to which of them it should forward requests. This information, accompanied with some internal parameters, such as the log level, comprises the plug-in configuration.
> > > > - Web Server Configuration - Each web server has some configuration that defines its behavior, e.g. on which port to listen, what files to serve, what web server plug-ins to load, etc. You will need to modify your web server configuration to instruct it to load the Tomcat redirector mod_jk.

> > > Getting mod_jk

> > > > The mod_jk source now resides in the jakarta-tomcat-connectors subproject. Please refer to it for build instructions.

> > > > Binaries for mod_jk are available for several platforms in the same area as the Tomcat Binary Release. The binaries are located in subdirectories by platform. For some platforms, such as Windows, this is the typical way of obtaining mod_jk since most Windows systems do not have C compilers. For others, the binary distribution of mod_jk offers simpler installation.

> > > > Note: Note: The version of mod_jk is not dependent on the version of Tomcat. The Tomcat 3.3 distribution of mod_jk will function correctly with Tomcat 4.x and other 3.x versions of Tomcat, such as Tomcat 3.2.1.

> > > Configuring Apache

> > > > If you've previously configured Apache to use mod_jserv, remove any ApJServMount directives from your httpd.conf. If you're including tomcat-apache.conf or tomcat.conf, you'll want to remove them as well - they are specific to mod_jserv. The mod_jserv configuration directives are not compatible with mod_jk!

> > > > Like Tomcat 3, Tomcat 4 can automatically generate the necessary `$CATALINA_HOME/conf/mod_jk.conf`, but it can also be created manually. Note that Tomcat and Apache must be restarted after adding a new context. See the "Using ApacheConfig" section for more details.

> > > > Basic configuration

> > > > - You will need to instruct Apache to load Tomcat. This can be done with Apache's LoadModule and AddModule configuration directives.
> > > > - You must inform mod_jk the location of your workers.properties file. Use mod_jk's JkWorkersFile configuration directive.
> > > > - You should specify a location where mod_jk is going to place its log file and a log level to be used. Use the JkLogFile and JkLogLevel configuration directives. Possible log levels are debug, info, error and emerg. If the JkLogLevel is not specified, no log is generated.
> > > > - The directive JkLogStampFormat will configure the date/time format found on mod_jk logfile. Using strftime() format string it's set by default to "[%a %b %d %H:%M:%S %Y] "
> > > > - Use mod_jk's JkMount directive to assign specific URLs to Tomcat. In general the structure of a JkMount directive is: `JkMount URL_PREFIX WORKER_NAME`. You can use the JkMount directive at the top level or inside <VirtualHost> sections of your httpd.conf file.
> > > > - The directive `JkRequestLogFormat` (Apache 1.3 only) will configure the format of mod_jk individual request logging. Request logging is configured and enabled on a per virtual host basis. To enable request logging for a virtual host just add a JkRequestLogFormat config. The syntax of the format string is similiar to the Apache LogFormat command, here is a list of the avaialbe request log format options:
> > > >   - %b - Bytes sent, excluding HTTP headers. In CLF format
> > > >   - %B - Bytes sent, excluding HTTP headers.
> > > >   - %H - The request protocol
> > > >   - %m - The request method
> > > >   - %p - The canonical Port of the server serving the request
> > > >   - %q - The query string (prepended with a ? if a query string exists, otherwise an empty string)
> > > >   - %r - First line of request
> > > >   - %s - request HTTP status code
> > > >   - %T - Requset duration, elapsed time to handle request in seconds '.' micro seconds
> > > >   - %U - The URL path requested, not including any query string.
> > > >   - %v - The canonical ServerName of the server serving the request.
> > > >   - %V - The server name according to the UseCanonicalName setting.
> > > >   - %w - Tomcat worker name
> > > > A simple example would be to include the following lines in your `httpd.conf` file:

> > > >                LoadModule    jk_module  libexec/mod_jk.so
> > > >                AddModule     mod_jk.c
> > > >                JkWorkersFile /usr/local/jakarta-tomcat/conf/workers.properties
> > > >                JkLogFile     /usr/local/apache/logs/mod_jk.log
> > > >                JkLogLevel    info
> > > >                JkLogStampFormat "[%a %b %d %H:%M:%S %Y] "

> > > > Assigning URLs to Tomcat

> > > > If you have created a custom or local version of `mod_jk.conf-local` as noted above, you can change settings such as the workers or URL prefix.

> > > > Use mod_jk's JkMount directive to assign specific URLs to Tomcat. In general the structure of a JkMount directive is:

> > > >                JkMount <URL prefix> <Worker name>

> > > > For example the following directives will send all requests ending in `.jsp` or with `/servlet` as the second path componenet to the "`ajp13`" worker, but jsp requests to files located in /otherworker will go to "`remoteworker`".

> > > >                JkMount /*.jsp ajp13
> > > >                JkMount /*/servlet/ ajp13
> > > >                JkMount /otherworker/*.jsp remoteworker

> > > > You can use the `JkMount` directive at the top level or inside `<VirtualHost>` sections of your httpd.conf file.

> > > > Configuring Apache to serve static web application files

> > > > If the Tomcat Host appBase (webapps) directory is accessible by the Apache web server, Apache can be configured to serve web application context directory static files instead of passing the request to Tomcat.

> > > > Caution: If Apache is configured to serve static pages for a web application it bypasses any security contraints you may have configured in your web application web.xml config file.

> > > > Use Apache's Alias directive to map a single web application context directory into Apache's document space for a VirtualHost:

> > > >                # Static files in the examples webapp are served by apache
> > > >                Alias /examples /export/home/web/host1/webapps/examples

> > > >                JkMount /*.jsp ajp13
> > > >                JkMount /*/servlet/ ajp13

> > > > Use the mod_jk JkAutoAlias (Apache 1.3 only) directive to map all web application context directories into Apache's document space. Attempts to access the `WEB-INF` or `META-INF` directories within a web application context or a Web Archive `*.war` within the Tomcat Host appBase (webapps) directory will fail with an HTTP 403, Access Forbidden.

> > > > Example configuration for an Apache VirtualHost:

> > > >                # Static files in all Tomcat webapp context directories are served by apache
> > > >                JkAutoAlias /export/home/web/host2/webapps

> > > >                JkMount /*.jsp ajp13
> > > >                JkMount /*/servlet/ ajp13

> > > Configuring Tomcat

> > > > Tomcat 4 can be configured to automatically generate the Apache configuration file. The next section describes how to enable this option.

> > > > After enabling the AJP 1.3 connector, you need to define workers, using a `$CATALINA_HOME/conf/workers.properties` file. In most cases, using the example workers.properties given below should work fine, after changing the path values to reflect how your environment is set up.

> > > Using ApacheConfig

> > > > Tomcat 4 provides extra flexability over Tomcat 3 in setting up the automatic generation of the Apache configuration file. However, this comes at the cost of a bit more complexity. Each time that Tomcat is started, it will write the configuration file to `$CATALINA_HOME/conf/auto/mod_jk.conf`. You can then either

> > > >     Include $CATALINA_HOME/conf/auto/mod_jk.conf

> > > > in your `httpd.conf` file.

> > > > To generate the global Apache directives (e.g. `LoadModule`, `JkLogFile`), you define a `Server` Listener:

> > > >        <Server port="8005" shutdown="SHUTDOWN" debug="0">
> > > >          <Listener className="org.apache.ajp.tomcat4.config.ApacheConfig" />
> > > >          ...

> > > > To configure the individual context information, you then either define a `Host` Listener or a `Context` Listener depending on if you are using virutal hosting or not. Defining a `Host` Listener will generate the Apache `<VirtualHost>` directive and include all of the configurations for the `Contexts` under this host. Using the `Context` Listener allows you the flexability to configure the `Context` the same way even if it is being served from several hosts.

> > > > Except for the placement of the `<Listener ...>`, the syntax is virtualy identical for the `Host` Listener and the `Context` Listener. The examples that follow will demonstrate the functionality for a `Host` Listener. The simplest configuration is:

> > > >         <Host name="localhost" debug="0" appbase="webapps" >
> > > >           <Listener className="org.apache.ajp.tomcat4.config.ApacheConfig"
> > > >               append="true" />

> > > > It is possible to modify the output configuration file with the following attributes:

> > > > Attribute | Description
> > > > --- | ---
> > > > `configHome` | Default parent directory for the following paths. If not set, this defaults to CATALINA_HOME. Ignored whenever any of the following paths is absolute
> > > > `jkConfig` | Path to write apacke mod_jk conf file to. If not set, defaults to "conf/auto/mod_jk.conf".
> > > > `workersConfig` | Path to workers.properties file used by mod_jk. If not set, defaults to "conf/jk/workers.properties".
> > > > `modJk` | Path to Apache mod_jk plugin file. If not set, defaults to "modules/mod_jk.dll" on windows, "modules/mod_jk.nlm" on netware, and "libexec/mod_jk.so" everywhere else.
> > > > `jkLog` | Path to log file to be used by mod_jk
> > > > `jkDebug` | JK Loglevel setting. May be debug, info, error, or emerg. If not set, defaults to no log.
> > > > `jkWorker` | The desired worker. Must be set to one of the workers defined in the workers.properties file. "ajp13" or "inprocess" are the workers found in the default workers.properties file. If not specified, defaults to "ajp13".
> > > > `forwardAll` | If true, forward all requests to Tomcat. This helps ensure that all the behavior configured in the web.xml file functions correctly. If false, let Apache serve static resources. The default is true. Warning: When false, some configuration in the web.xml may not be duplicated in Apache. Review the mod_jk conf file to see what configuration is actually being set in Apache.

> > > > `noRoot`

> > > > If true, the root context is not mapped to Tomcat. If false and forwardAll is true, all requests to the root context are mapped to Tomcat. If false and forwardAll is false, only JSP and servlets requests to the root context are mapped to Tomcat. When false, to correctly serve Tomcat's root context you must also modify the DocumentRoot setting in Apache's httpd.conf file to point to Tomcat's root context directory. Otherwise some content, such as Apache's index.html, will be served by Apache before mod_jk gets a chance to claim the request and pass it to Tomcat. The default is true.

> > > > `append` | Append to the current configuration file.

> > > Example Configuration Files

> > > > Excerpt from workers.properties showing the Ajp13 worker:

> > > >     # Setup for Solaris system
> > > >     #
> > > >     workers.tomcat_home=/usr/local/jakarta-tomcat
> > > >     workers.java_home=/usr/java
> > > >     ps=/
> > > >     worker.list=ajp12, ajp13

> > > >     # Definition for Ajp13 worker
> > > >     #
> > > >     worker.ajp13.port=8009
> > > >     worker.ajp13.host=localhost
> > > >     worker.ajp13.type=ajp13

> > > > Excerpt from Apaches httpd.conf showing JK directives:

> > > >     # Load mod_jk
> > > >     #
> > > >     LoadModule jk_module libexec/mod_jk.so
> > > >     AddModule mod_jk.c

> > > >     # Configure mod_jk
> > > >     #
> > > >     JkWorkersFile /usr/local/jakarta-tomcat/conf/jk/workers.properties
> > > >     JkLogFile /usr/local/apache/logs/mod_jk.log
> > > >     JkLogLevel info

> > > >     # First Virtual Host.
> > > >     #
> > > >     <VirtualHost 10.0.0.1:80>
> > > >     DocumentRoot /web/host1
> > > >     ServerName host1.apache.org
> > > >     JkMount /*.jsp ajp13
> > > >     JkMount /servlet/* ajp13
> > > >     </VirtualHost>

> > > >     # Second Virtual Host. Also accessible via HTTPS
> > > >     #
> > > >     <VirtualHost 10.0.0.2:80>
> > > >     DocumentRoot /web/host2
> > > >     ServerName host2.apache.org
> > > >     JkMount /*.jsp ajp13
> > > >     JkMount /servlet/* ajp13
> > > >     </VirtualHost>

> > > >     <VirtualHost 10.0.0.2:443>
> > > >     DocumentRoot /web/host2
> > > >     ServerName host2.apache.org
> > > >     SSLEngine On
> > > >     JkMount /*.jsp ajp13
> > > >     JkMount /servlet/* ajp13
> > > >     </VirtualHost>

> IIS 4.x and 5.x

> > Introduction

> > > This section explains how to set up IIS 4.0 or newer to cooperate with Tomcat 4. Normally IIS cannot execute Servlets and Java Server Pages (JSPs), configuring IIS to use Tomcat redirector plugin will allow IIS to redirect Servlet and JSP requests to Tomcat.

> > > The Tomcat redirector for IIS is composed of four entities:

> > > - isapi_redirect.dll - The IIS server plugin, either obtain a pre-built DLL or build it yourself (see the build section).
> > > - worker.properties - A file that describes the host(s) and port (s) used by the workers (Tomcat processes).
> > > - uriworkermap.properties - A file that maps URL-Path patterns to workers.
> > > - iis_redirect.reg - A file that creates registry entries in the Windows registry.

> > Installation

> > > Make sure the Tomcat AJP connector is properly declared in the Catalina configuration file.

> > > Download isapi_redirect.dll for Tomcat 3.3 release or use the following link.

> > > You can then either manually define a few extra configuration files (read below), or use the automatic IISConfig to have Tomcat generate them for you (see next section).

> > > The next step is to create worker.properties to help isapi_redirect.dll to identify where to find Tomcat and its configuration.

> > > Next, the ISAPI filter for Tomcat must be configured to redirect requests for specific webapps to Tomcat.

> > > Then the `uriworkermap.properties` file must be created in `%CATALINA_HOME%\conf` directory.

> > > Note: See below for examples of the configuration files. Those configuration files assume Tomcat is installed in the `c:\jakarta-tomcat-4.0.1` directory.

> > Using IISConfig

> > > Tomcat 4 provides extra flexability over Tomcat 3 in setting up the automatic generation of the IIS configuration file. However, this comes at the cost of a bit more complexity. Each time that Tomcat is started, it will write the configuration file to `%CATALINA_HOME%/conf/auto/uriworkersmap.properties`. If enabled as a `Server` Listener, it will also write the required registry entries to `%CATALINA_HOME%/conf/auto/iis_redirect.reg`. You may enter the settings into the registry by double-clicking on this file from the Windows Explorer.

> > > To generate the global IIS directives (including the registry file), you define a `Server` Listener:

> > >        <Server port="8005" shutdown="SHUTDOWN" debug="0">
> > >          <Listener className="org.apache.ajp.tomcat4.config.IISConfig" />
> > >          ...

> > > To configure the individual context information, you then either define a `Host` Listener or a `Context` Listener depending on if you are using virutal hosting or not. Defining a `Host` Listener will include all of the configurations for the `Contexts` under this host. Using the `Context` Listener allows you the flexability to configure the `Context` the same way even if it is being served from several hosts.

> > > Except for the placement of the `<Listener ...>`, the syntax is virtualy identical for the `Host` Listener and the `Context` Listener. The examples that follow will demonstrate the functionality for a `Host` Listener. The simplest configuration is:

> > >         <Host name="localhost" debug="0" appbase="webapps" >
> > >           <Listener className="org.apache.ajp.tomcat4.config.IISConfig"
> > >               append="true" />

> > > It is possible to modify the output configuration file with the following attributes:

> > > Attribute | Description
> > > --- | ---
> > > `configHome` | Default parent directory for the following paths. If not set, this defaults to CATALINA_HOME. Ignored whenever any of the following paths is absolute.
> > > `regConfig` | Path to use for writing the registry settings configuration file. If not set, defaults to "conf/auto/iis_redirect.reg".
> > > `uriConfig` | Path to use for writing the URI worker map configuration file. If not set, defaults to "conf/auto/uriworkermap.properties".
> > > `workersConfig` | Path to workers.properties file used by mod_jk. If not set, defaults to "conf/jk/workers.properties".
> > > `jkLog` | path to log file to be used by mod_jk
> > > `jkDebug` | JK Loglevel setting. May be debug, info, error, or emerg. If not set, defaults to no emerg.
> > > `jkWorker` | The desired worker. Must be set to one of the workers defined in the workers.properties file. "ajp13" or "inprocess" are the workers found in the default workers.properties file. If not specified, defaults to "ajp13".
> > > `forwardAll` | If true, forward all requests to Tomcat. This helps ensure that all the behavior configured in the web.xml file functions correctly. If false, let IIS serve static resources. The default is true. Warning: When false, some configuration in the web.xml may not be duplicated in IIS. Review the mod_jk conf file to see what configuration is actually being set in IIS.

> > > `noRoot`

> > > If true, the root context is not mapped to Tomcat. If false and forwardAll is true, all requests to the root context are mapped to Tomcat. If false and forwardAll is false, only JSP and servlets requests to the root context are mapped to Tomcat. When false, to correctly serve Tomcat's root context you must also modify the DocumentRoot setting in IIS's httpd.conf file to point to Tomcat's root context directory. Otherwise some content, such as IIS's index.html, will be served by IIS before mod_jk gets a chance to claim the request and pass it to Tomcat. The default is true.

> > > `append` | Append to the current configuration file.

> > Configuring IIS

> > > - Launch Internet Service Manager
> > > - Stop the Web Site if it is running
> > > - Create a virtual directory, by clicking on the default web site
> > >   - Type the alias to say jakarta, press Next
> > >   - Set the directory to `%CATALINA_HOME%\bin` where you installed isapi_redirect.dll, press next
> > >   - Provide only read and execute privileges for security purposes
> > > - Add a filter to the default web site, using the IIS Management Console, right click on the properties and go to ISAPI filters tab. Press Add button, add isapi_redirect.dll as a filter the name of the filter should reflect its task (for example, "Jakarta Redirector"). The Executable field should point to the place where we installed isapi_redirect.dll, in our case `%CATALINA_HOME%\bin\isapi_redirect.dll`
> > > - If not done yet, enter the keys from `iis_redirect.reg` in the Windows registry (this can be done by double-clicking on the file in the explorer). Note: When manually creating the file (maybe from the example given below), remember to correct the directories where Tomcat is installed.
> > > - Startup IIS.
> > > - Go to the Properties of the web site and select the ISAPI filters tab to make sure that the ISAPI filter got registered correctly. It should have a Green arrow alongside it. Note: it is recommended to restart computer for the ISAPI filter to load.

> > Sample worker.properties file

> > >     # ************ Begin worker.properties **************
> > >     worker.ajp13.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.lbfactor=1

> > >     #
> > >     # Specify the size of the open connection cache.
> > >     #worker.ajp13.cachesize

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

> > >     #
> > >     # The loadbalancer (type lb) worker perform weighted 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
> > >     #        worker.
> > >     worker.loadbalancer.type=lb
> > >     worker.loadbalancer.balanced_workers=ajp13

> > >     #
> > >     # worker.tomcat_home should point to the location where you
> > >     # installed tomcat. This is where you have your conf, webapps and lib
> > >     # directories.
> > >     #
> > >     worker.tomcat_home=C:\jakarta-tomcat-4.0.1

> > >     #
> > >     # worker.java_home should point to your Java installation. Normally
> > >     # you should have a bin and lib directories beneath it.
> > >     #
> > >     worker.java_home=C:\jdk1.3.1

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

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

> > >     #
> > >     #------ DEFAULT worker list ------------------------------------------
> > >     #---------------------------------------------------------------------
> > >     #
> > >     # The worker that your plugins should create and work with
> > >     worker.list=ajp13

> > >     #
> > >     #------ DEFAULT ajp13 WORKER DEFINITION ------------------------------
> > >     #---------------------------------------------------------------------
> > >     #

> > >     #
> > >     # Defining a worker named ajp13 and of type ajp13
> > >     # Note that the name and the type do not have to match.
> > >     #
> > >     worker.ajp13.port=8009
> > >     worker.ajp13.host=localhost

> > >     # ************ End worker.properties **************

> > Sample uriworkermap.properties

> > >     # *********** Begin uriworkermap.properties ***
> > >     #
> > >     # Simple worker configuration file
> > >     #

> > >     # Mount the Servlet context to the ajp13 worker
> > >     /servlet/*=ajp13

> > >     # Mount the examples context to the ajp13 worker
> > >     /examples/*=ajp13

> > >     # Advanced mount of the examples context
> > >     # /examples/servlet/*=ajp13
> > >     # ************* End uriworkermap.properties ****

> > iis_redirect.reg

> > >     REGEDIT4
> > >     [HKEY_LOCAL_MACHINE\SOFTWARE\Apache Software Foundation\Jakarta Isapi Redirector\1.0]
> > >     "extension_uri"="/jakarta/isapi_redirect.dll"
> > >     "log_file"="C:\\jakarta-tomcat-4.0.1\\logs\\iis_redirect.log"
> > >     "log_level"="emerg"
> > >     "worker_file"="C:\\jakarta-tomcat-4.0.1\\conf\\worker.properties"
> > >     "worker_mount_file"="C:\\jakarta-tomcat-4.0.1\\conf\\uriworkermap.properties"

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