Servlet init param (JavaRanch mock question)

[Chandra Bhatt]

The Element in the Deployment Descriptor for a servlet initialization parameter is :

<!ELEMENT init-param(param-name, param-value, description?)>


TRUE <<---
FALSE

Answer says true,
as I know servlet init param is defined in the DD as:

<servlet>
<servlet-name>...</servlet-name>
<servlet-class>...</servlet-class>
<init-param>
<param-name>...</param-name>
<param-value>...</param-value>
</init-param>
</servlet>

Did i read between the lines, regarding that question?
Please help!


Thanks,

[Christophe Verré]

init-param contains zero or more "description", one "param-name" and one "param-value".

[Remko Strating]

description?

? means zero or more I conclude

[khushhal yadav]

Hi Christophe

Will these work? If No, why?

<servlet>
<servlet-name>...</servlet-name>
<servlet-class>...</servlet-class>
<init-param>
<param-value>...</param-value>
<param-name>...</param-name>
</init-param>
</servlet>

<servlet>
<init-param>
<param-name>...</param-name>
<param-value>...</param-value>
</init-param>
<servlet-name>...</servlet-name>
<servlet-class>...</servlet-class>
</servlet>

[Christophe Verré]

The order of tags does not matter in Servlets 2.4, so both will be ok.

[khushhal yadav]

It means, it's OK for SCWCD CX-310-081

As the exam is based on Servlet 2.4, JSP 2.0 and tld-version 1.2

Am I right Christophe??

Regards,
Khushhal

[Christophe Verré]

it's OK for SCWCD CX-310-081

That's right.

And be careful the Javaranch's mock exam was aimed at SCWCD2.3, so it may contain some old questions.

[Chandra Bhatt]

[Remko]:
description?

? means zero or more I conclude

? means zero or one. In other words, there can be none or one <description>
sub-element.

Am I correct?


Thanks for your replies!

[khushhal yadav]

Thank you Christophe

Regards,
Khushhal

[khushhal yadav]

Yes Chandra

You are right

<description> is an optional element.
And can appear zero to multiple times.

Regards,
Khushhal

[Chandra Bhatt]

Is prior to current version, the init parameters were declared like this?

<!ELEMENT init-param(param-name, param-value, description?)>

What does this mean?


Thanks,

[Christophe Verré]

Yes, they were described using a DTD. Now they are using an XML schema, which you can see here.

The init-param is now defined this way : (I've done a bit of editing)

<xsd:sequence>
<xsd:element name="description" type="j2ee :mrgreen: escriptionType" minOccurs="0" maxOccurs="unbounded"/>
<xsd:element name="param-name" type="j2ee:string"/>
<xsd:element name="param-value" type="j2ee:xsdStringType"/>
</xsd:sequence>

[ August 07, 2007: Message edited by: Christophe Verre ]

[Chandra Bhatt]

Thanks Christophe,

I got it.

Khushal, my reply mismatches to what you said.
I know it is zero or one. You say it is zero or more.

Please confirm!


Thanks,

[Christophe Verré]

In the old version (DTD), description? means that there may be 0 or 1 description.
The new version tells that there may be 0 or more (minOccurs="0" maxOccurs="unbounded") description tags.
That's confusing, so try to forget about version 2.3

[khushhal yadav]

Hi Chandra..

As per DTD

<!ELEMENT init-param (param-name, param-value, description?)>

It's zero or one.

But as per XML schema

<xsd:sequence>
<xsd:element name="description" type="j2ee escriptionType" minOccurs="0" maxOccurs="unbounded"/>
<xsd:element name="param-name" type="j2ee:string"/>
<xsd:element name="param-value" type="j2ee:xsdStringType"/>
</xsd:sequence>

It's zero to many

And I am using XML schema.

<web-app xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
version="2.4">

Regards,
Khushhal

[Chandra Bhatt]

Thanks you very much Christopher!


Khushhal, I got your point as well.

There has been very quick replies to this thread. I appreciate this.


Thanks,

[Raghavan Muthu]

Looks a good thread. We need to be always cautious on which version the exam (be it real or mock) covers! isnt it?