Calling servlet with out entry in web.xml

Hi
I want to know whether can a servlet be invoked with out having an entry in web.xml.Because to my knowledge when ever an entry is made in teh web.xml the <url-pattern> and the class file will be stored as key value combination it is only then when ever a request is made the server gets the class taht is to be invoked from the <url-pattern> that is passed from the client side.
Is ther any way by whihc we can call the servlet directly with out an entry in web.xml
Thanks in advance
Ajithkumar.S

Interesting that it is possible on Tomcat anyway.
What's the real benefit of not having a Servlet
definied in web.xml?
The only benefit I see is that
you don't need to understand/read/change XML when
adding or removing a servlet. That isn't worth that
imho. What are the other benefits?The only thing I can think of is , to be able to quickly access a Servlet that you've just written, because it takes additional steps to define it in the web.xml.
I think it would be a security concern (of some sort) , if the Servlet's class is known, that's why it is better to access a Servlet with a mapping from web.xml

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After further investigation: -
There are no problems with error pages based on error codes, only error exceptions.
As a test case, I have a service method in a servlet throwing either one of the three exception types that servlets can throw (Runtime, Servlet & IO) the following rules apply. The exception to be thrown is hardcoded and is changed and the web app rebuilt each time. The correct web.xml has been deployed to the app server (checked through console). the webapp is being redeployed correctly - this can be seen in the weblogic log, where the correct exception is reported.
I am using WLS 8.1, Servlet 2.3, JDK 1.4.1_02
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Despite having set error-page for exception javax.servlet.ServletException, the exceptions are diverted to the error page that has been set up for http error code 500
The error page for ServletException is therefore never reached.
I have the browser set to request pages every time it is asked.
Once the servlet has thrown an IOException, the only way to get the browser to report an IO or Runtime exception error-page is to clear the browser cache. Restarting the server has no effect.
Once the servlet has responded with ANY exception, it is not possible to get it to report a ServletException (which is incorrectly reported as a 500 anyway) unless the cache is cleared. Restarting the server has no effect.
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Hi there,
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Ah, I was trying to do a lookup from session bean for the env-entry defined in
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Still the error message with "comp.env" instead of the expected "comp/env" is
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Not much traffic in this newsgroup, is there?
Steve
"Steve Ditlinger" <[email protected]> wrote:
>
>
>
If I create an "env-entry" block for a name (e.g. "MySchemaName") in
my web.xml
file and deploy the web app, I should be able to look up the name from
my webapp
with the line:
 
myInitialContext.lookup("java:comp/env/MySchemaName");
 
However when I do that I get the error message:
 
javax.naming.NameNotFoundException: Unable to resolve 'java:comp.env/MySchemaName'
 
Note that the "comp/env" prefix has been changed to "comp.env". This
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WL 6.1. Is this a bug in WL 7's JNDI or a bug in the error message or
both or
something else altogether?
The immediately previous line successfully performs an EJBHome lookup
using the
same Initial Context object. The main difference is that the EJBHome
name is defined
thru the EJB deployment descriptors, not the web.xml.
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Steve

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Hi ,
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Hello,
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With kind regard,
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Let me describe my case in few more words...
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So, to make a long story short, I need a way to deploy those settings separated from (outside of) myApp.ear. By following you link, I have read that orion-web.xml should reside inside WEB-INF folder of myApp.ear, which is not good for me.

How to get Context paramters out of Tomcat web.xml file

The Documentation at Tomcat seems to suggest:
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Edit your web.xml file and add these entries,
<context-param>
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<web-app xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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Found a resolution to this in the end.
Unless you have the sub-elements in the order below, it will get validation errors.
<env-entry>
<env-entry-name>maxAmount</env-entry-name>
<env-entry-type>java.lang.String</env-entry-type>
<env-entry-value>aString</env-entry-value>
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A bit weird and very frustrating....

Env-entry in web.xml and 6.0 sp4

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From 2.3 specs:
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descriptor to meet the requirements of web containers that are JSP enabled or part
of a J2EE application server. They are not required to be supported by containers
wishing to support only the servlet specification.:
� taglib
� syntax for looking up JNDI objects (env-entry, ejb-ref, ejb-local-ref, resourceref,
resource-env-ref)
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Additional info...actually the code throws a NamingException.

Servlet cannot be preloaded given web.xml is defined in Weblogic 10.3...

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I guess this is new kind of error which very less have came across but it will be a lesson learnt if someone could throw some light as to why such errors are resulted and how it can be prevented.
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Edited by: jennifer123 on Aug 7, 2009 7:38 AM
Hello, Any idea whats goin on?
Edited by: jennifer123 on Aug 12, 2009 1:37 PM

Contact the Weblogic guys. This problem is unrelated to Servlet API.
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Let me describe my case in few more words...
I have some kind of client-server app. Clients have OC4J installed and they download myApp.ear and myApp_plan.dat files and by using script (Windows CMD batch file) clients install those files with admin_client.jar, OC4J's admin utility. The problem is that I have 2 different types of clients and I have client specific settings set in web.xml file and each time I compile myApp.ear I have to uncomment/comment some lines in web.xml.
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Your question doesn't appear to be relevant to this forum.

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Calling servlet with out entry in web.xml

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