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app server 
app server
<host>: virtual host configurationDescribes the virtual host configuration tags. child of <cluster>,<cluster-default>,<server>,<server-default>,<host>,<host-default>,<web-app>,<web-app-default>
<access-log> configures the access log file. As a child of <web-app>, overrides the definition in the <host> that the web-app is deployed in. As a child of <host>, overrides the definition in the <server> that the host is in. The default archive format is + ".%Y%m%d" or + ".%Y%m%d.%H" if rollover-period < 1 day. The access log formatting variables follow the Apache variables:
The default format is: default access log format
"%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\""
allows for custom logging. Applications can extend a custom class from com.caucho.http.log.AccessLog. Resin-IoC initialization can be used to set bean parameters in the custom class.
<access-log> schema
element access-log {
path?
& path-format?
& archive-format?
$amp;auto-flush?
& auto-flush-time?
& exclude*
& format?
& hostname-dns-lookup?
& rollover-period?
& rollover-size?
& rollover-count?
& resin:type?
& init?
}
Example: <access-log> in host configuration
<resin xmlns="http://caucho.com/ns/resin">
<cluster id="app-tier">
<host id="">
<access-log path='log/access.log'>
<rollover-period>2W</rollover-period>
</access-log>
</host>
</cluster>
</resin>
Example: custom access log
<resin xmlns="http://caucho.com/ns/resin">
<cluster id="app-tier">
<host id='foo.com'>
<access-log>
<test:MyLog xmlns:test="urn:java:test">
path='${resin.root}/foo/error.log'
rollover-period='1W'>
<test:foo>bar</test:foo>
</test:MyLog>
</access-log>
...
</host>
</cluster>
</resin>
Specifies ear expansion. ear-deploy can be used in web-apps to define a subdirectory for ear expansion.
<ear-deploy> schema
element ear-deploy {
path
& archive-directory?
& ear-default?
& expand-cleanup-fileset?
& expand-directory?
& expand-path?
& expand-prefix?
& expand-suffix?
& lazy-init?
& redeploy-mode?
& require-file*
& url-prefix?
}
child of <web-app>
Allows applications to customize the response generated for errors. By default, Resin returns a 500 Servlet Error and a stack trace for exceptions and a simple 404 File Not Found for error pages. With <error-page>, you may specify a handler page for these errors. The handler page has several request attributes set so that it may log, display, or otherwise use information about the error that occured. The following table describes the available attributes.
<error-page> schema
element error-page {
(error-code | exception-type)?
& location
}
Catching File Not Found
<web-app xmlns="http://caucho.com/ns/resin">
<error-page>
<error-code>404</error-code>
<location>/file_not_found.jsp</location>
</error-page>
</web-app>
Catching Exceptions
<web-app xmlns="http://caucho.com/ns/resin">
<error-page exception-type="java.lang.NullPointerException"
location="/nullpointer.jsp"/>
</web-app>
Using request attributes to obtain information about the request that caused the error
<%@ page session="false" isErrorPage="true" %>
<html>
<head><title>404 Not Found</title></head>
<body>
<h1>404 Not Found</h1>
The url <code>${requestScope["javax.servlet.error.request_uri"]}</code>
was not found.
</body>
</html>
child of <host>
<host-alias> defines a URL alias for matching HTTP requests. Any number of <host-alias> can be used for each alias. The host-alias can be used either in the resin.xml or in a host.xml when use host-deploy together with resin:import. Since the <host-deploy> and <host> tags lets you add a host.xml file to customize configuration, the <host-alias> can also fit in the custom host.xml page. <host-alias> schema
element host-alias {
string
}
Example: host-alias in the resin.xml
<resin xmlns="http://caucho.com">
<cluster id="">
<host id="www.foo.com" root-directory="/var/resin/foo.com">
<host-alias>foo.com</host-alias>
<web-app id=""/>
</host>
</cluster>
</resin>
Example: host-alias in a /var/resin/hosts/foo/host.xml <host xmlns="http://caucho.com"> <host-name>www.foo.com</host-name> <host-alias>foo.com</host-alias> <web-app id="" root-directory="htdocs"/> </host> child of <host>
<host-alias-regexp> defines a regular expression for matching URLs for a given virtual host. <host-alias-regexp> schema
element host-alias-regexp {
string
}
Example: host-alias-regexp in the resin.xml
<resin xmlns="http://caucho.com">
<cluster id="">
<host id="www.foo.com" root-directory="/var/resin/foo.com">
<host-alias-regexp>.*foo.com</host-alias-regexp>
<web-app id=""/>
</host>
</cluster>
</resin>
child of <cluster>
Defaults for a virtual host. The host-default can contain any of the host configuration tags. It will be used as defaults for any virtual host. child of <cluster>
<host-deploy> configures an automatic deployment directory for virtual hosts. The host-deploy will add an EL variable ${host.name}, referring to the name of the host jar file.
<host-deploy> schema
element host-deploy {
archive-directory?
& expand-cleanup-fileset?
& expand-directory?
& host-default?
& host-name?
& path?
}
The following example configures as a host deployment directory. Each virtual host will have a directory for .war deployment. So the directory would serve the URL . <host-deploy>
<resin xmlns="http://caucho.com/ns/resin">
<cluster id="app-tier">
<root-directory>/var/resin</root-directory>
<host-deploy path="hosts">
<host-default>
<resin:import path="host.xml" optional="true"/>
<web-app-deploy path="webapps"/>
</host-default>
</host-deploy>
</cluster>
</resin>
child of <host>
<host-name> defines the canonical name for a virtual host. The <host-name> will be used in Resin's logging, management, and is available in the host's variables. <host-name> schema
element host-name {
string
}
child of <web-app>
default automatic<redeploy-mode> specifies how Resin handles updates to web-apps and .war files. By default, Resin restarts web-apps when classes or configuration files change.
<redeploy-mode> schema
element redeploy-mode {
automatic | manual
}
<root-directory> specifies the base directory for the contexts. All EL-style directory paths are relative to the root-directory. <root-directory> schema
element root-directory {
r_path-Type
}
Example: cluster root-directory
<resin xmlns="http://caucho.com/ns/resin">
<cluster id="app-tier">
<root-directory>/var/resin/app-tier</root-directory>
<server id="a" ...>
<host host-name="www.foo.com">
</cluster>
</resin>
<secure-host-name> sets a host-name or URL to be used for secure redirection. For some security configurations, Resin needs to redirect from an insecure site to a secure one. The <secure-host-name> configures the host to redirect to. See Resin security. <secure-host-name> schema
element secure-host-name {
string
}
<startup-mode> configures the virtual-host's behavior on Resin startup, either "automatic", "lazy" or "manual".
<startup-mode> schema
element startup-mode {
string
}
web-app configures a web application. When specified by , the application will be initialized on server start. When specified by <url-regexp>, the application will be initialized at the first request. This means that servlets may start later than expected for applications.
The following example creates a web-app for /apache using the Apache htdocs directory to serve pages. <host id=''> <web-app id='/apache' root-directory='/usr/local/apache/htdocs'> ... </host> The following example sets the root web-app to the IIS root directory. <web-app id='/' root-directory='C:/inetpub/wwwroot'> When the is specified with a , can use replacement variables (). In the following, each user gets his or her own independent application using .
<host id=''>
<web-app url-regexp='/~([^/]*)'
root-directory='/home/$1/public_html'>
...
</web-app>
</host>
child of <cluster>
<web-app-default> defines default values for any web-app in the cluster. Example: web-app-default
<resin xmlns="http://caucho.com/ns/resin">
<cluster id="app-tier">
<web-app-default>
<servlet servlet-name="resin-php"
servlet-class="com.caucho.quercus.servlet.QuercusServlet"/>
<servlet-mapping url-pattern="*.php"
servlet-name="resin-php"/>
</web-app-default>
<host id="">
...
</cluster>
</resin>
Specifies war expansion. web-app-deploy can be used in web-apps to define a subdirectory for war expansion. The tutorials in the documentation use web-app-deploy to allow servlet/tutorial/helloworld to be an independent war file.
<web-app-deploy> schema
element web-app-deploy {
archive-directory?
expand-cleanup-fileset?
expand-directory?
expand-prefix?
expand-preserve-fileset?
expand-suffix?
path?
redeploy-check-interval?
redeploy-mode?
require-file*
startup-mode?
url-prefix?
versioning?
web-app-default*
web-app*
}
Overriding web-app-deploy configurationThe web-app-deploy can override configuration for an expanded war with a matching <web-app> inside the <web-app-deploy>. The <root-directory> is used to match web-apps. Example: resin.xml overriding web.xml
<resin xmlns="http://caucho.com/ns/resin">
<cluster id="">
<host id="">
<web-app-deploy path="webapps">
<web-app context-path="/wiki"
root-directory="wiki">
<context-param database="jdbc/wiki">
</web-app>
</web-app-deploy>
</host>
</cluster>
</resin>
versioningThe versioning attribute of the <web-app-deploy> tag improves web-app version updates by enabling a graceful update of sessions. The web-apps are named with numeric suffixes, e.g. foo-10, foo-11, etc, and can be browsed as /foo. When a new version of the web-app is deployed, Resin continues to send current session requests to the previous web-app. New sessions go to the new web-app version. So users will not be aware of the application upgrade. The expand-preserve-fileset attribute lets you keep files for a redeployment, which can improve restart times. Normally, Resin will delete all files for an update, including the compiled files for JSP, which forces Resin to recompile JSP files, even if they haven't changed in the update. If you add the expand-preserve-fileset, Resin will only recompile the JSP files that have changed.
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