global variables inside a Tomcat JSP-Servlet app.
Dear List, I hope someone can give some hints to a none java/TC -specialist. We have a jsp-servlet app, which has some important app variables inside the web.xml. Because the validation for these parameters is quite complex we have a single public class with public static setters and getters available to the all servlets and jsp pages within the application. We use a context listener to read the parameters, so we can initalise this public object reading the web.xml This works fine but I was wondering if there is a better way of doing this ? Would appreciate any comment. We are using TC 4.0 and 5.0 regards, Ben - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Global Variables
Cool. Thanks for the replies all. Cheers - Duncan Ilari Kontinen wrote: -Original Message- From: Duncan [mailto:[EMAIL PROTECTED] Sent: Wednesday, December 03, 2003 11:50 AM To: Tomcat Users List Subject: Re: Global Variables Thanks for the replies, but what do I define servletContext as? An easy way to get the ServletContext from JSP-page is to use the Servlet-method getServletContext(). So for getting the context parameter, add the following code-snipped: % String param = getServletContext().getInitParameter(param); % And for then on, you can reference it e.g. by: %= param % Many thanks Duncan Jardin Xavier wrote: use context-param param-nameparam/param-name param-valuevalue/param-value /context-param in the web.xml and String param = servletContext.getInitParameter(param); in the JSP. - Original Message - From: Duncan [EMAIL PROTECTED] To: Tomcat User List [EMAIL PROTECTED] Sent: Wednesday, December 03, 2003 5:08 PM Subject: Global Variables Is there a way to set global variables in the web.xml which can be read by any JSP page? Cheers, -Duncan - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Global Variables
Is there a way to set global variables in the web.xml which can be read by any JSP page? Cheers, -Duncan - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Global Variables
use context-param param-nameparam/param-name param-valuevalue/param-value /context-param in the web.xml and String param = servletContext.getInitParameter(param); in the JSP. - Original Message - From: Duncan [EMAIL PROTECTED] To: Tomcat User List [EMAIL PROTECTED] Sent: Wednesday, December 03, 2003 5:08 PM Subject: Global Variables Is there a way to set global variables in the web.xml which can be read by any JSP page? Cheers, -Duncan - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Global Variables
Howdy, Yeah, context-param parameters are available to all resources within the context (servlets, JSPs, filters, listeners, etc) for the lifetime of the application. Yoav Shapira Millennium ChemInformatics -Original Message- From: Duncan [mailto:[EMAIL PROTECTED] Sent: Wednesday, December 03, 2003 11:08 AM To: Tomcat User List Subject: Global Variables Is there a way to set global variables in the web.xml which can be read by any JSP page? Cheers, -Duncan - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] This e-mail, including any attachments, is a confidential business communication, and may contain information that is confidential, proprietary and/or privileged. This e-mail is intended only for the individual(s) to whom it is addressed, and may not be saved, copied, printed, disclosed or used by anyone else. If you are not the(an) intended recipient, please immediately delete this e-mail from your computer system and notify the sender. Thank you. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Global Variables
Thanks for the replies, but what do I define servletContext as? Many thanks Duncan Jardin Xavier wrote: use context-param param-nameparam/param-name param-valuevalue/param-value /context-param in the web.xml and String param = servletContext.getInitParameter(param); in the JSP. - Original Message - From: Duncan [EMAIL PROTECTED] To: Tomcat User List [EMAIL PROTECTED] Sent: Wednesday, December 03, 2003 5:08 PM Subject: Global Variables Is there a way to set global variables in the web.xml which can be read by any JSP page? Cheers, -Duncan - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Global Variables
Howdy, Are you serious? ;) You might want to buy a servlets book or go through a tutorial, this is a very basic concept. You don't define a servlet context, the server creates one for you. You define context parameters in your deployment descriptor, the web.xml file. Yoav Shapira Millennium ChemInformatics -Original Message- From: Duncan [mailto:[EMAIL PROTECTED] Sent: Wednesday, December 03, 2003 11:50 AM To: Tomcat Users List Subject: Re: Global Variables Thanks for the replies, but what do I define servletContext as? Many thanks Duncan Jardin Xavier wrote: use context-param param-nameparam/param-name param-valuevalue/param-value /context-param in the web.xml and String param = servletContext.getInitParameter(param); in the JSP. - Original Message - From: Duncan [EMAIL PROTECTED] To: Tomcat User List [EMAIL PROTECTED] Sent: Wednesday, December 03, 2003 5:08 PM Subject: Global Variables Is there a way to set global variables in the web.xml which can be read by any JSP page? Cheers, -Duncan - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] This e-mail, including any attachments, is a confidential business communication, and may contain information that is confidential, proprietary and/or privileged. This e-mail is intended only for the individual(s) to whom it is addressed, and may not be saved, copied, printed, disclosed or used by anyone else. If you are not the(an) intended recipient, please immediately delete this e-mail from your computer system and notify the sender. Thank you. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Global Variables
Here is is added to the default web.xml file that shipps in the TOMCAT_HOME/webapps/ROOT/WEB-INF/web.xml file ?xml version=1.0 encoding=ISO-8859-1? !DOCTYPE web-app PUBLIC -//Sun Microsystems, Inc.//DTD Web Application 2.3//EN http://java.sun.com/dtd/web-app_2_3.dtd; web-app display-nameWelcome to Tomcat/display-name description Welcome to Tomcat /description context-param param-nameparam/param-name param-valuevalue/param-value /context-param /web-app On Wednesday 03 December 2003 11:50 am, Duncan wrote: Thanks for the replies, but what do I define servletContext as? Many thanks Duncan Jardin Xavier wrote: use context-param param-nameparam/param-name param-valuevalue/param-value /context-param in the web.xml and String param = servletContext.getInitParameter(param); in the JSP. - Original Message - From: Duncan [EMAIL PROTECTED] To: Tomcat User List [EMAIL PROTECTED] Sent: Wednesday, December 03, 2003 5:08 PM Subject: Global Variables Is there a way to set global variables in the web.xml which can be read by any JSP page? Cheers, -Duncan - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] -- Ben Souther F.W. Davison Company, Inc. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Global Variables
in the JSP.. -Original Message- From: Duncan [mailto:[EMAIL PROTECTED] Sent: Wednesday, December 03, 2003 11:50 AM To: Tomcat Users List Subject: Re: Global Variables Thanks for the replies, but what do I define servletContext as? Many thanks Duncan Jardin Xavier wrote: use context-param param-nameparam/param-name param-valuevalue/param-value /context-param in the web.xml and String param = servletContext.getInitParameter(param); in the JSP. - Original Message - From: Duncan [EMAIL PROTECTED] To: Tomcat User List [EMAIL PROTECTED] Sent: Wednesday, December 03, 2003 5:08 PM Subject: Global Variables Is there a way to set global variables in the web.xml which can be read by any JSP page? Cheers, -Duncan - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Global Variables
Sorry, if you are trying to define servletContext , please refer any JSP book. -Original Message- From: Duncan [mailto:[EMAIL PROTECTED] Sent: Wednesday, December 03, 2003 11:50 AM To: Tomcat Users List Subject: Re: Global Variables Thanks for the replies, but what do I define servletContext as? Many thanks Duncan Jardin Xavier wrote: use context-param param-nameparam/param-name param-valuevalue/param-value /context-param in the web.xml and String param = servletContext.getInitParameter(param); in the JSP. - Original Message - From: Duncan [EMAIL PROTECTED] To: Tomcat User List [EMAIL PROTECTED] Sent: Wednesday, December 03, 2003 5:08 PM Subject: Global Variables Is there a way to set global variables in the web.xml which can be read by any JSP page? Cheers, -Duncan - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Global Variables
Duncan, and String param = servletContext.getInitParameter(param); Thanks for the replies, but what do I define servletContext as? In every JSP, the ServletContext object is implicitly declared with the identifier application. So, you should just be able to do something like this in your JSP: p my_param = %= application.getInitParameter(my_param) % /p -chris - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Global Variables
-Original Message- From: Duncan [mailto:[EMAIL PROTECTED] Sent: Wednesday, December 03, 2003 11:50 AM To: Tomcat Users List Subject: Re: Global Variables Thanks for the replies, but what do I define servletContext as? An easy way to get the ServletContext from JSP-page is to use the Servlet-method getServletContext(). So for getting the context parameter, add the following code-snipped: % String param = getServletContext().getInitParameter(param); % And for then on, you can reference it e.g. by: %= param % Many thanks Duncan Jardin Xavier wrote: use context-param param-nameparam/param-name param-valuevalue/param-value /context-param in the web.xml and String param = servletContext.getInitParameter(param); in the JSP. - Original Message - From: Duncan [EMAIL PROTECTED] To: Tomcat User List [EMAIL PROTECTED] Sent: Wednesday, December 03, 2003 5:08 PM Subject: Global Variables Is there a way to set global variables in the web.xml which can be read by any JSP page? Cheers, -Duncan - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: [HOW TO] - GLOBAL VARIABLES - PLEASE HELP
Hi Donie,
The second half of this is you need to know how to access it:
try {
Context initCtx = new InitialContext();
String foo = (String)(context.lookup (java:comp/env/foo));
}
catch (NamingException exc) {
// oops
}
Regards,
Mathew
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Web Architect, Gerard Industries
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Hi Donie,
You can define a variable in the global web.xml (in conf directory).
This variable should be available to all your applications.
This should
come at the end of the $TOMCAT_HOME/conf/web.xml file.
Though I have not used and tested this (I use for a single
application
in application specific web.xml) I feel it should work.
env-entry
descriptionsome description/description
env-entry-namefoo/env-entry-name
env-entry-valuebar/env-entry-value
env-entry-typejava.lang.String/env-entry-type
/env-entry
Raj
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[HOW TO] - GLOBAL VARIABLES - PLEASE HELP
Hi all Sorry for shouting but I've no hair left so it's the only thing I can do :) Please tell me if it's possible to define a variable in server.xml or somewhere, which is available to all running webapps. I've looked in loads of docs and searched the archive but to no avail. Please please please Donie -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED]
Re: [HOW TO] - GLOBAL VARIABLES - PLEASE HELP
Hi Donie, You can define a variable in the global web.xml (in conf directory). This variable should be available to all your applications. This should come at the end of the $TOMCAT_HOME/conf/web.xml file. Though I have not used and tested this (I use for a single application in application specific web.xml) I feel it should work. env-entry descriptionsome description/description env-entry-namefoo/env-entry-name env-entry-valuebar/env-entry-value env-entry-typejava.lang.String/env-entry-type /env-entry Raj Donie Kelly wrote: Hi all Sorry for shouting but I've no hair left so it's the only thing I can do :) Please tell me if it's possible to define a variable in server.xml or somewhere, which is available to all running webapps. I've looked in loads of docs and searched the archive but to no avail. Please please please Donie -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED] -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED]
global variables from server.xml
Hi all I want to set a variable in server.xml which can be read by all webapps. How do I do this? Donie -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED]
AW: How to create global variables wich could be accessed by all jsp sites and servlet's?
That's it... Thank you very much. SH -Ursprüngliche Nachricht- Von: Donie Kelly [mailto:[EMAIL PROTECTED]] Gesendet: Montag, 3. Dezember 2001 16:46 An: 'Tomcat Users List' Betreff: RE: How to create global variables wich could be accessed by all jsp sites and servlet's? Have a look at system.properties eg: // Set up new system propeties sc = getServletContext(); RootPath = sc.getRealPath(/); propFile = new FileInputStream(RootPath + myapp.properties); Properties p = new Properties(System.getProperties()); p.load(propFile); System.setProperties(p); Run this in some servlet init() method which loads on startup (see web.xml) A file like this will then be in your $TOMCAT/webapps/app directory myapp.properties # My variable myvar=myvalue You can access these variables with System.getProperty(myvar) Hope this helps Donie -- To unsubscribe: mailto:[EMAIL PROTECTED] For additional commands: mailto:[EMAIL PROTECTED] Troubles with the list: mailto:[EMAIL PROTECTED]
How to create global variables wich could be accessed by all jsp sites and servlet's?
Hi, I've found nothing about how to save Variables wich are stored globally in reference to one context. Normally I handle the variables in session objects for each user. But I've some preferences wich should be read only once at the start of the tomcat server and then always only read by the classes/jsp sites. I need it, because the initialisation of these variables consumes much time, and i have running it now for each new created session object. But it is only needed once at the servers startup. How to do that? Thx SH PS: Sorry for my bad english. -- To unsubscribe: mailto:[EMAIL PROTECTED] For additional commands: mailto:[EMAIL PROTECTED] Troubles with the list: mailto:[EMAIL PROTECTED]
RE: How to create global variables wich could be accessed by all jsp sites and servlet's?
You may want to use a properties file or much more 'mordern' nowadays, create XML file which hold the values. The Properties class is easier to work with directly I think. Wouter -Original Message- From: Sebastian Hagenbrock [mailto:[EMAIL PROTECTED]] Sent: Monday, 03 December, 2001 15:36 To: Tomcat Maillist Subject: How to create global variables wich could be accessed by all jsp sites and servlet's? Hi, I've found nothing about how to save Variables wich are stored globally in reference to one context. Normally I handle the variables in session objects for each user. But I've some preferences wich should be read only once at the start of the tomcat server and then always only read by the classes/jsp sites. I need it, because the initialisation of these variables consumes much time, and i have running it now for each new created session object. But it is only needed once at the servers startup. How to do that? Thx SH PS: Sorry for my bad english. -- To unsubscribe: mailto:[EMAIL PROTECTED] For additional commands: mailto:[EMAIL PROTECTED] Troubles with the list: mailto:[EMAIL PROTECTED] -- To unsubscribe: mailto:[EMAIL PROTECTED] For additional commands: mailto:[EMAIL PROTECTED] Troubles with the list: mailto:[EMAIL PROTECTED]
RE: How to create global variables wich could be accessed by all jsp sites and servlet's?
Have a look at system.properties eg: // Set up new system propeties sc = getServletContext(); RootPath = sc.getRealPath(/); propFile = new FileInputStream(RootPath + myapp.properties); Properties p = new Properties(System.getProperties()); p.load(propFile); System.setProperties(p); Run this in some servlet init() method which loads on startup (see web.xml) A file like this will then be in your $TOMCAT/webapps/app directory myapp.properties # My variable myvar=myvalue You can access these variables with System.getProperty(myvar) Hope this helps Donie -Original Message- From: Sebastian Hagenbrock [mailto:[EMAIL PROTECTED]] Sent: 03 December 2001 14:36 To: Tomcat Maillist Subject: How to create global variables wich could be accessed by all jsp sites and servlet's? Hi, I've found nothing about how to save Variables wich are stored globally in reference to one context. Normally I handle the variables in session objects for each user. But I've some preferences wich should be read only once at the start of the tomcat server and then always only read by the classes/jsp sites. I need it, because the initialisation of these variables consumes much time, and i have running it now for each new created session object. But it is only needed once at the servers startup. How to do that? Thx SH PS: Sorry for my bad english. -- To unsubscribe: mailto:[EMAIL PROTECTED] For additional commands: mailto:[EMAIL PROTECTED] Troubles with the list: mailto:[EMAIL PROTECTED] -- To unsubscribe: mailto:[EMAIL PROTECTED] For additional commands: mailto:[EMAIL PROTECTED] Troubles with the list: mailto:[EMAIL PROTECTED]
Re: How to create global variables wich could be accessed by alljsp sites and servlet's?
-Original Message- From: Sebastian Hagenbrock [mailto:[EMAIL PROTECTED]] Sent: 03 December 2001 14:36 To: Tomcat Maillist Subject: How to create global variables wich could be accessed by all jsp sites and servlet's? Hi, I've found nothing about how to save Variables wich are stored globally in reference to one context. Normally I handle the variables in session objects for each user. But I've some preferences wich should be read only once at the start of the tomcat server and then always only read by the classes/jsp sites. I need it, because the initialisation of these variables consumes much time, and i have running it now for each new created session object. But it is only needed once at the servers startup. How to do that? Thx SH [...] there are already other ways in other repling-emails, the following is my suggestions: if you want to make your Variables visible inside-context, I think you also can save them with: - javax.servlet.ServletContext.getAttribute/setAttribute - use a class which wrap your variables as a data container, and put this class together with your Servlet class. if you want to make your Variables visible cross-context, I think you also can save them with: - use a class which wrap your variables as a data container, and put this class in JAKARTA_HOME/common/classes or JAKARTA_HOME/shared/classes(JAKARTA_HOME/classes) Bo Dec.03, 2001 -- To unsubscribe: mailto:[EMAIL PROTECTED] For additional commands: mailto:[EMAIL PROTECTED] Troubles with the list: mailto:[EMAIL PROTECTED]
