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HTTP Status 404 - /HelloWorld

naveen yadav

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posted 12 years ago

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hi ranchers ,

i have html form (index.html) which accepts the name from user

and the servlet file HelloWorld.java retrieve name of user and displays back to user

when i submit the html form i got HTTP Status 404 - /HelloWorld

note that i have not created any web.xml file

what is the problem here ?

Rob Spoor

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posted 12 years ago

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In HTML, / means the root of the server, not the root of the web application. Your action is looking one level too high.

Also, servlets need a web.xml file with servlet and servlet-mapping entries. Without these servlets will never work.

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Bosun Bello

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posted 12 years ago

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Where is your servlet class located? My advice to you would be to make sure your servlet class is in a package, and put an entry that maps to your servlet in web.xml.

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naveen yadav

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posted 12 years ago

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here is web.xml under \WEB-INF dir.

Still getting same error.

Bear Bibeault

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posted 12 years ago

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If you are not going to pay attention to the replies, why are you posting in the first place?

Bosun Bello wrote:My advice to you would be to make sure your servlet class is in a package

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naveen yadav

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posted 12 years ago

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Reason for not using package was that the servlet container will look for servlet in \WEB-INF\class directory by default.

but nervertheless i have placed HelloWorld in org package

so 1 line of code is changed in web.xml

also in index.html

Still
HTTP Status 404 - /SESSION/org.HelloWorld

Khalil Salman

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posted 12 years ago

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Change action=”org.HelloWorld” to action=”poi”. Because poi is the name of your HelloWorld servlet.

Bear Bibeault

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naveen yadav wrote: Reason for not using package was that the servlet container will look for servlet in \WEB-INF\class directory by default.

While that is the base of the hierarchy, the classes must be in an explicit package. As of Java 1.4, classes in the unnamed default package cannot be imported.

You can argue with us, or you can learn how to do things correctly. The choice is yours.

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Bear Bibeault

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posted 12 years ago

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Khalil Salman wrote:Change action=”org.HelloWorld” to action=”poi”. Because poi is the name of your HelloWorld servlet.

While that is a step in the right direction, the action must be prefixed with the context path to ensure that it will work in all environments.

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Daniel Val

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posted 12 years ago

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naveen yadav wrote:
here is web.xml under \WEB-INF dir.

<web-app> <servlet> <servlet-name>poi</servlet-name> <servlet-class>HelloWorld</servlet-class> </servlet> <servlet-mapping> <servlet-name>poi</servlet-name> <url-pattern>/index.html</url-pattern> </servlet-mapping> </web-app>

Still getting same error.

- url pattern must be something /HellowWorld/* something like that, not what you have there; I suggest you use url patter *.something, then you change the action of your form to whatever.something and the url pattern of the servlet to *.something - please put whatever you want instead of that. I don't like url patterns that look like that /whatever/* - it is nothing wrong with them but I had issues in the past.

- in WEB-INF/classes (note the name is slightly different than what you got) you gotta put the compiled *.class file not the Java file. No issue if .java and .class are in the same folder although this is a bad practice, but you have to compile it first.

- root package is ok, should work. It is a (severely) discouraged practice, but for testing you should be fine.

D.

Bear Bibeault

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posted 12 years ago

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Daniel Val wrote:url pattern must be something /HellowWorld/* something like that, not what you have there

Nope. It can be what he has there -- though I would strongly advise against using ".html"

I don't like url patterns that look like that /whatever/* - it is nothing wrong with them but I had issues in the past.

There should be no issues and it is a more modern approach than the old-fashioned *.do patterns. If you had issues it was not due to the type of pattern used.

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naveen yadav

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Bear Bibeault wrote:

You can argue with us, or you can learn how to do things correctly. The choice is yours.

i was not arguing. i was explaining the reason why i use the default package there. that was a mistake and have learned to put class always in a package.

It's always helpful to learn from your mistakes because then your mistakes seem worthwhile.
Garry Marshall

naveen yadav

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posted 12 years ago

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so finally it worked after doing some changes.

change in web.xml instead of using /index.html

in index.html file instead of using the /HelloWorld

thank you guys.

Daniel Val

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Bear Bibeault wrote:

Daniel Val wrote:url pattern must be something /HellowWorld/* something like that, not what you have there

Nope. It can be what he has there -- though I would strongly advise against using ".html"

No, it is not that, please see his example:
- he's got a html page
- the form defined in it is with action="/HelloWorld"
- when he submits the form he wants to go to the servlet

So the servlet must be installed at the url pattern /HelloWorld/... that's what I was saying...

Bear Bibeault wrote:

I don't like url patterns that look like that /whatever/* - it is nothing wrong with them but I had issues in the past.

There should be no issues and it is a more modern approach than the old-fashioned *.do patterns. If you had issues it was not due to the type of pattern used.

True, and of course now I don't have issues with any of the approaches, but for the good old time sake I prefer the second one *.something...

D

naveen yadav

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posted 12 years ago

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index.html -----invokes------->org.Hello //working fine

first.html<--------response-------or.Hello //working fine

the mapping for the above flow control

first.html----------invoke---------->org.FirstQue ............//problem first.html could not invoke the servlet FirstQue,

the mapping for above flow of control is

and error is HTTP Status 404 - /ProjSession/org/first

Rob Spoor

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posted 12 years ago

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Your form action is "hello". That must mean you must have a url-mapping for "hello". You don't. Therefore it fails.

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Bear Bibeault

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posted 12 years ago

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One more time: the form action should be the servlet context followed by the servlet mapping.

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naveen yadav

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posted 12 years ago

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Bear you will be surprised to see , in following code ACTION have servlet context followed by url mapping BUT giving Http-404

But following code is working fine
web.xml

the strange behavior may be because for the mapping of index.html(which is welcome file for the context)

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