Re: [jetty-users] Run multiple instances of the same WAR servlet and pass it a config value

[Joakim Erdfelt via jetty-users]

In your  /var/www/jetty-base-de/webapps/de.xml, you can set a
init-parameter that can be accessed from the
ServletContext.getInitParameter()

Example:


http://www.eclipse.org/jetty/configure_10_0.dtd;>


/de
/var/www/words-5.0.war

mycontext.language
de




Then you can access it ...

@Override
public void init() throws ServletException {
String language =
getServletContext().getInitParameter("mycontext.language");
}


Joakim Erdfelt / joa...@webtide.com


On Wed, Oct 4, 2023 at 3:00 AM Alexander Farber via jetty-users <
jetty-users@eclipse.org> wrote:

> Good morning,
>
> I have an "overengineered" setup with Jetty 10.0.16 and haproxy 2.7.8,
> where I currently run 6 different Jetty instances to serve the same servlet
> -
>
> I have programmed that WAR servlet using Maven and it supports 6 languages:
>
> src/main/resources/strings.properties
> src/main/resources/strings_de.properties
> src/main/resources/strings_fr.properties
> src/main/resources/strings_nl.properties
> src/main/resources/strings_pl.properties
> src/main/resources/strings_ru.properties
>
> and then in the configure method I fetch the language value from the
> "COUNTRY" env var:
>
> @Override
> public void configure(JettyWebSocketServletFactory factory) {
> mLanguage = System.getenv("COUNTRY");
> mBundle = ResourceBundle.getBundle("strings",
> LOCALES.get(mLanguage));
>
> factory.setIdleTimeout(Duration.ofSeconds(IDLE_TIMEOUT_SECONDS));
> factory.setMaxBinaryMessageSize(0);
> factory.setMaxTextMessageSize(64 * 1024);
> factory.setCreator(new WordsCreator(this,
> mBundle.getString(STR_DATABASE_URL)));
> }
>
> Then I have the following 6 scripts on my Rocky Linux 8.8 to start the
> Jetty instances
>
> /etc/systemd/system/jetty-de.service
> /etc/systemd/system/jetty-en.service
> /etc/systemd/system/jetty-fr.service
> /etc/systemd/system/jetty-nl.service
> /etc/systemd/system/jetty-pl.service
> /etc/systemd/system/jetty-ru.service
>
> And the only differences the scripts have is the port and the "COUNTRY"
> env var:
>
> [Unit]
> Description=Jetty
> After=network-online.target
>
> [Service]
> Environment=COUNTRY=de
>
> Type=simple
> User=jetty
> Group=jetty
> ExecStart=/usr/bin/java -Djdbc.drivers=org.postgresql.Driver -jar
> /usr/share/java/jetty-home-10.0.16/start.jar
> jetty.home=/usr/share/java/jetty-home-10.0.16
> jetty.base=/var/www/jetty-base-de jetty.http.host=127.0.0.1
> jetty.http.port=8081
> SuccessExitStatus=143
> Restart=always
> RestartSec=180
> PrivateTmp=true
>
> [Install]
> WantedBy=multi-user.target
>
> In the /etc/haproxy/haproxy.cfg I look at the request path and forward the
> request to one of the ports:
>
> backend jetty_de
> server domain 127.0.0.1:8081 send-proxy
> backend jetty_en
> server domain 127.0.0.1:8082 send-proxy
> backend jetty_fr
> server domain 127.0.0.1:8083 send-proxy
> backend jetty_nl
> server domain 127.0.0.1:8084 send-proxy
> backend jetty_pl
> server domain 127.0.0.1:8085 send-proxy
> backend jetty_ru
> server domain 127.0.0.1:8080 send-proxy
>
> frontend wordsbyfarber_com
> bind 95.216.113.90:80
> bind 95.216.113.90:443 ssl crt
> /etc/pki/tls/certs/wordsbyfarber.com.pem no-sslv3
>
> redirect scheme https if !{ ssl_fc }
>
> use_backend jetty_de if { path_beg /de }
> use_backend jetty_en if { path_beg /en }
> use_backend jetty_fr if { path_beg /fr }
> use_backend jetty_nl if { path_beg /nl }
> use_backend jetty_pl if { path_beg /pl }
> use_backend jetty_ru if { path_beg /ru }
>
> default_backend jetty_en
>
> Finaly my config XML files look like this to "bind" the servlet to a
> certain context path:
>
> # cat /var/www/jetty-base-de/webapps/de.xml
> 
>  "http://www.eclipse.org/jetty/configure_9_0.dtd;>
> 
>
> /de
> /var/www/words-5.0.war
>
> 
>
> Thank you for reading my mail, it is a bit longer, because I am trying to
> provide enough details.
>
> My question is, if it is possible to handle my task with a single Jetty
> instance?
>
> Could I set the env var in the  /var/www/jetty-base-de/webapps/de.xml file?
>
> Or maybe alternatively access the value of "contextPath" from the
> configure() method?
>
> Thank you for any suggestions
> Alex
>
>
> ___
> jetty-users mailing list
> jetty-users@eclipse.org
> To unsubscribe from this list, visit
> https://www.eclipse.org/mailman/listinfo/jetty-users
>
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Re: [jetty-users] Run multiple instances of the same WAR servlet and pass it a config value

[Jan Bartel via jetty-users]

You could call the method setInitParameter(String,String) via the context
xml that defines the webapp, then you can retrieve it in the init() of your
servlet via the ServletConfig.getInitParameter(String).

Jan

On Thu, 5 Oct 2023 at 06:42, Alexander Farber via jetty-users <
jetty-users@eclipse.org> wrote:

> Apologies, the getServletConfig().getContextPath() in the init() of my
> servlet works well, that probably had been a problem in my VS Code.
>
> Still I wonder, if I would set a "property" with a "name" and "value" as
> described in the "Jetty XML Syntax" section
> https://eclipse.dev/jetty/documentation/jetty-10/operations-guide/index.html#og-xml
> - how could I retrieve the value in the servlet?
>
> Best regards
> Alex
>
>
> ___
> jetty-users mailing list
> jetty-users@eclipse.org
> To unsubscribe from this list, visit
> https://www.eclipse.org/mailman/listinfo/jetty-users
>


-- 
Jan Bartel 
www.webtide.com
*Expert assistance from the creators of Jetty and CometD*
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Re: [jetty-users] Run multiple instances of the same WAR servlet and pass it a config value

[Alexander Farber via jetty-users]

Apologies, the getServletConfig().getContextPath() in the init() of my
servlet works well, that probably had been a problem in my VS Code.

Still I wonder, if I would set a "property" with a "name" and "value" as
described in the "Jetty XML Syntax" section
https://eclipse.dev/jetty/documentation/jetty-10/operations-guide/index.html#og-xml
- how could I retrieve the value in the servlet?

Best regards
Alex
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Re: [jetty-users] Run multiple instances of the same WAR servlet and pass it a config value

[Alexander Farber via jetty-users]

I try to use the following but the method is not available:

@Override
public void init() throws ServletException {
super.init();

mLanguage = getServletConfig().getContextPath();
   }
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[jetty-users] Run multiple instances of the same WAR servlet and pass it a config value

[Alexander Farber via jetty-users]

Good morning,

I have an "overengineered" setup with Jetty 10.0.16 and haproxy 2.7.8,
where I currently run 6 different Jetty instances to serve the same servlet
-

I have programmed that WAR servlet using Maven and it supports 6 languages:

src/main/resources/strings.properties
src/main/resources/strings_de.properties
src/main/resources/strings_fr.properties
src/main/resources/strings_nl.properties
src/main/resources/strings_pl.properties
src/main/resources/strings_ru.properties

and then in the configure method I fetch the language value from the
"COUNTRY" env var:

@Override
public void configure(JettyWebSocketServletFactory factory) {
mLanguage = System.getenv("COUNTRY");
mBundle = ResourceBundle.getBundle("strings",
LOCALES.get(mLanguage));

factory.setIdleTimeout(Duration.ofSeconds(IDLE_TIMEOUT_SECONDS));
factory.setMaxBinaryMessageSize(0);
factory.setMaxTextMessageSize(64 * 1024);
factory.setCreator(new WordsCreator(this,
mBundle.getString(STR_DATABASE_URL)));
}

Then I have the following 6 scripts on my Rocky Linux 8.8 to start the
Jetty instances

/etc/systemd/system/jetty-de.service
/etc/systemd/system/jetty-en.service
/etc/systemd/system/jetty-fr.service
/etc/systemd/system/jetty-nl.service
/etc/systemd/system/jetty-pl.service
/etc/systemd/system/jetty-ru.service

And the only differences the scripts have is the port and the "COUNTRY" env
var:

[Unit]
Description=Jetty
After=network-online.target

[Service]
Environment=COUNTRY=de

Type=simple
User=jetty
Group=jetty
ExecStart=/usr/bin/java -Djdbc.drivers=org.postgresql.Driver -jar
/usr/share/java/jetty-home-10.0.16/start.jar
jetty.home=/usr/share/java/jetty-home-10.0.16
jetty.base=/var/www/jetty-base-de jetty.http.host=127.0.0.1
jetty.http.port=8081
SuccessExitStatus=143
Restart=always
RestartSec=180
PrivateTmp=true

[Install]
WantedBy=multi-user.target

In the /etc/haproxy/haproxy.cfg I look at the request path and forward the
request to one of the ports:

backend jetty_de
server domain 127.0.0.1:8081 send-proxy
backend jetty_en
server domain 127.0.0.1:8082 send-proxy
backend jetty_fr
server domain 127.0.0.1:8083 send-proxy
backend jetty_nl
server domain 127.0.0.1:8084 send-proxy
backend jetty_pl
server domain 127.0.0.1:8085 send-proxy
backend jetty_ru
server domain 127.0.0.1:8080 send-proxy

frontend wordsbyfarber_com
bind 95.216.113.90:80
bind 95.216.113.90:443 ssl crt
/etc/pki/tls/certs/wordsbyfarber.com.pem no-sslv3

redirect scheme https if !{ ssl_fc }

use_backend jetty_de if { path_beg /de }
use_backend jetty_en if { path_beg /en }
use_backend jetty_fr if { path_beg /fr }
use_backend jetty_nl if { path_beg /nl }
use_backend jetty_pl if { path_beg /pl }
use_backend jetty_ru if { path_beg /ru }

default_backend jetty_en

Finaly my config XML files look like this to "bind" the servlet to a
certain context path:

# cat /var/www/jetty-base-de/webapps/de.xml

http://www.eclipse.org/jetty/configure_9_0.dtd;>


/de
/var/www/words-5.0.war



Thank you for reading my mail, it is a bit longer, because I am trying to
provide enough details.

My question is, if it is possible to handle my task with a single Jetty
instance?

Could I set the env var in the  /var/www/jetty-base-de/webapps/de.xml file?

Or maybe alternatively access the value of "contextPath" from the
configure() method?

Thank you for any suggestions
Alex
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