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Posted to users@cocoon.apache.org by Eric Everman <ev...@precedadesign.com> on 2002/10/28 21:46:32 UTC
xsp request variable is not declaired
Hi Everyone-
Here is a newbe question: I'm trying to use the implicit 'request'
variable in a xsp page, however, whenever I try to access it like this I
get a NPE error at line x:
<xsp:logic>
keyword = request.getParameter("value"); //line x
</xsp:logic>
When I attempt to access it like this, I get an "illegal start of type"
error at line x:
<xsp:logic>
String comment = "";
if (request == null) { //line x
comment = "Request is null";
} else {
comment = "Request is NOT null";
}
</xsp:logic>
This seems to point to 'request' as not having been declared, doesn't
it? Doing something like this works:
<xsp:logic>
String keyword = "C";
</xsp:logic>
<content>
<esql:connection>
<esql:pool>cocoon</esql:pool>
<esql:execute-query>
<!-- <xsp-request:get-parameter name="value"/> -->
<esql:query>select * from Resources where ResourceName like
'%<xsp:expr>keyword</xsp:expr>%'</esql:query>
<esql:results>
<esql:row-results>
<row>
<esql:get-columns/></row>
</esql:row-results>
</esql:results>
</esql:execute-query>
</esql:connection>
</content>
Any ideas? This is driving me up the wall. I would post more of the error
code, config, etc, but it seems like this must be something major and
(hopefully) obvious.
Thanks,
Eric Everman
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Re: xsp request variable is not declaired
Posted by "Ilya A. Kriveshko" <il...@kaon.com>.
I'm pretty sure it is an XSP feature, but is possibly a documentation bug.
The feature allows you to, for example, declare instance variables or
declare instance or static methods to be used in the body of the XSP.
Wouldn't you agree?
I'm actually using it in some of my XSP pages, so please don't report it
as a bug - or someone might actually fix it. :-)
Glad I could help.
--
Ilya
Eric Everman wrote:
> THANKYOU!
>
> That was the problem - Implicit variables are not created until the
> content tag is reached, thus logic referencing them will fail if prior
> to the content tag.
>
> The code that I reference for placing the logic outside the content
> tag was from a JavaWorld article. Did this used to work and now doesn't?
>
> This seems like a bug or at least an anti-feature. Should I report it?
>
> Thanks,
>
> Eric Everman
>
>
>
> At 10/29/2002, you wrote:
>
>> Try putting a document tag around all of your content and logic.
>> I.e.:
>>
>> =====================================================
>> <?xml version="1.0"?>
>> <xsp:page language="java" xmlns:xsp="http://apache.org/xsp">
>>
>> <content>
>> <xsp:logic>
>> String keyword = request.getParameter("value");
>> </xsp:logic>
>>
>> The 'value' parameter was: <xsp:expr>keyword</xsp:expr>
>> </content>
>>
>> </xsp:page>
>> =====================================================
>>
>> I think the problem might come from the fact that until first XML
>> data is emited, you are not in the context of the request handler,
>> but in the context of the class. I am not 100% sure, but it would be
>> easy for you to check if you looked at the generated source code. The
>> "request" variable probably isn't set until you are actually in the
>> handler method.
>>
>> Also, the namespace URI you have for xsp prefix
>> (xmlns:xsp="http://apache.org/xsp") seems to be correct - that's what
>> the xsp.xsl logicsheet is using.
>>
>> G'luck.
>> --
>> Ilya
>>
>> Eric Everman wrote:
>>
>>> At 10/28/2002, you wrote:
>>>
>>>> You do not appear to have declared `keyword'.
>>>>
>>>> i.e., try:
>>>>
>>>> String keyword = request.getParameter("value");
>>>>
>>>> Dave
>>>
>>>
>>>
>>>
>>> Ha, fair enough. But believe it or not, this is a copy/paste error.
>>> Here is the simplest xsp page that causes the problem (verbatim this
>>> time):
>>>
>>> =====================================================
>>> <?xml version="1.0"?>
>>> <xsp:page language="java" xmlns:xsp="http://apache.org/xsp">
>>>
>>> <xsp:logic>
>>> String keyword = request.getParameter("value");
>>> </xsp:logic>
>>>
>>> <content>
>>> The 'value' parameter was: <xsp:expr>keyword</xsp:expr>
>>> </content>
>>>
>>> </xsp:page>
>>> =====================================================
>>>
>>> This xsp causes a NPE:
>>> java.lang.NullPointerException
>>> at org.apache.cocoon.www.examples.db1_xsp.(D:\Program
>>> Files\Apache Group\Tomcat
>>> 4.1\work\Standalone\localhost\cctest\cocoon-files\org/apache/cocoon/www/examples\db1_xsp.java:62)
>>>
>>>
>>> Line 62 is "String keyword = request.getParameter("value");"
>>>
>>> Sorry for the initial mis-post. Any ideas?
>>>
>>> Eric Everman
>>>
>>>
>>> ---------------------------------------------------------------------
>>> Please check that your question has not already been answered in the
>>> FAQ before posting. <http://xml.apache.org/cocoon/faq/index.html>
>>>
>>> To unsubscribe, e-mail: <co...@xml.apache.org>
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>>>
>>
>>
>>
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>> FAQ before posting. <http://xml.apache.org/cocoon/faq/index.html>
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>
>
>
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Re: xsp request variable is not declaired
Posted by Eric Everman <ev...@precedadesign.com>.
THANKYOU!
That was the problem - Implicit variables are not created until the content
tag is reached, thus logic referencing them will fail if prior to the
content tag.
The code that I reference for placing the logic outside the content tag was
from a JavaWorld article. Did this used to work and now doesn't?
This seems like a bug or at least an anti-feature. Should I report it?
Thanks,
Eric Everman
At 10/29/2002, you wrote:
>Try putting a document tag around all of your content and logic.
>I.e.:
>
>=====================================================
><?xml version="1.0"?>
><xsp:page language="java" xmlns:xsp="http://apache.org/xsp">
>
><content>
> <xsp:logic>
> String keyword = request.getParameter("value");
> </xsp:logic>
>
> The 'value' parameter was: <xsp:expr>keyword</xsp:expr>
></content>
>
></xsp:page>
>=====================================================
>
>I think the problem might come from the fact that until first XML data is
>emited, you are not in the context of the request handler, but in the
>context of the class. I am not 100% sure, but it would be easy for you to
>check if you looked at the generated source code. The "request" variable
>probably isn't set until you are actually in the handler method.
>
>Also, the namespace URI you have for xsp prefix
>(xmlns:xsp="http://apache.org/xsp") seems to be correct - that's what the
>xsp.xsl logicsheet is using.
>
>G'luck.
>--
>Ilya
>
>Eric Everman wrote:
>
>>At 10/28/2002, you wrote:
>>
>>>You do not appear to have declared `keyword'.
>>>
>>>i.e., try:
>>>
>>> String keyword = request.getParameter("value");
>>>
>>>Dave
>>
>>
>>
>>Ha, fair enough. But believe it or not, this is a copy/paste error.
>>Here is the simplest xsp page that causes the problem (verbatim this time):
>>
>>=====================================================
>><?xml version="1.0"?>
>><xsp:page language="java" xmlns:xsp="http://apache.org/xsp">
>>
>><xsp:logic>
>> String keyword = request.getParameter("value");
>></xsp:logic>
>>
>><content>
>>The 'value' parameter was: <xsp:expr>keyword</xsp:expr>
>></content>
>>
>></xsp:page>
>>=====================================================
>>
>>This xsp causes a NPE:
>>java.lang.NullPointerException
>> at org.apache.cocoon.www.examples.db1_xsp.(D:\Program
>> Files\Apache Group\Tomcat
>> 4.1\work\Standalone\localhost\cctest\cocoon-files\org/apache/cocoon/www/examples\db1_xsp.java:62)
>>
>>
>>Line 62 is "String keyword = request.getParameter("value");"
>>
>>Sorry for the initial mis-post. Any ideas?
>>
>>Eric Everman
>>
>>
>>---------------------------------------------------------------------
>>Please check that your question has not already been answered in the
>>FAQ before posting. <http://xml.apache.org/cocoon/faq/index.html>
>>
>>To unsubscribe, e-mail: <co...@xml.apache.org>
>>For additional commands, e-mail: <co...@xml.apache.org>
>>
>
>
>
>---------------------------------------------------------------------
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Re: xsp request variable is not declaired
Posted by "Ilya A. Kriveshko" <il...@kaon.com>.
Try putting a document tag around all of your content and logic.
I.e.:
=====================================================
<?xml version="1.0"?>
<xsp:page language="java" xmlns:xsp="http://apache.org/xsp">
<content>
<xsp:logic>
String keyword = request.getParameter("value");
</xsp:logic>
The 'value' parameter was: <xsp:expr>keyword</xsp:expr>
</content>
</xsp:page>
=====================================================
I think the problem might come from the fact that until first XML data
is emited, you are not in the context of the request handler, but in the
context of the class. I am not 100% sure, but it would be easy for you
to check if you looked at the generated source code. The "request"
variable probably isn't set until you are actually in the handler method.
Also, the namespace URI you have for xsp prefix
(xmlns:xsp="http://apache.org/xsp") seems to be correct - that's what
the xsp.xsl logicsheet is using.
G'luck.
--
Ilya
Eric Everman wrote:
> At 10/28/2002, you wrote:
>
>> You do not appear to have declared `keyword'.
>>
>> i.e., try:
>>
>> String keyword = request.getParameter("value");
>>
>> Dave
>
>
>
> Ha, fair enough. But believe it or not, this is a copy/paste error.
> Here is the simplest xsp page that causes the problem (verbatim this
> time):
>
> =====================================================
> <?xml version="1.0"?>
> <xsp:page language="java" xmlns:xsp="http://apache.org/xsp">
>
> <xsp:logic>
> String keyword = request.getParameter("value");
> </xsp:logic>
>
> <content>
> The 'value' parameter was: <xsp:expr>keyword</xsp:expr>
> </content>
>
> </xsp:page>
> =====================================================
>
> This xsp causes a NPE:
> java.lang.NullPointerException
> at org.apache.cocoon.www.examples.db1_xsp.(D:\Program
> Files\Apache Group\Tomcat
> 4.1\work\Standalone\localhost\cctest\cocoon-files\org/apache/cocoon/www/examples\db1_xsp.java:62)
>
>
> Line 62 is "String keyword = request.getParameter("value");"
>
> Sorry for the initial mis-post. Any ideas?
>
> Eric Everman
>
>
> ---------------------------------------------------------------------
> Please check that your question has not already been answered in the
> FAQ before posting. <http://xml.apache.org/cocoon/faq/index.html>
>
> To unsubscribe, e-mail: <co...@xml.apache.org>
> For additional commands, e-mail: <co...@xml.apache.org>
>
>
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Re: [sitemap] Passing parameters to XML
Posted by Dave Biggar <da...@sympatico.ca>.
Thanks Eric but unfortunately my problem is not the same
as yours. I have always had a root element <page>.
Dave
----- Original Message -----
From: "Eric Everman" <ev...@precedadesign.com>
To: <co...@xml.apache.org>
Sent: Tuesday, October 29, 2002 11:13 AM
Subject: Re: [sitemap] Passing parameters to XML
> Dave-
>
> I believe you are having the same problem I was having. Ilya's reply to
me
> fixed the problem: Implicit variables are not created until the content
> tag is reached, thus logic prior to <content> that references them will
fail.
>
> I'm *very* new to Cocoon so I have no experience with past versions. If
> this worked previously for you and now doesn't, this must be the result of
> a change in the way xsp pages are processed (isn't this breaking all kinds
> of code?!!!). I was going to report this as a bug, however, someone with
> more history (like yourself) should make that call.
>
> Is this what is causing your problem?
>
> Eric Everman
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Re: [sitemap] Passing parameters to XML
Posted by Eric Everman <ev...@precedadesign.com>.
Dave-
I believe you are having the same problem I was having. Ilya's reply to me
fixed the problem: Implicit variables are not created until the content
tag is reached, thus logic prior to <content> that references them will fail.
I'm *very* new to Cocoon so I have no experience with past versions. If
this worked previously for you and now doesn't, this must be the result of
a change in the way xsp pages are processed (isn't this breaking all kinds
of code?!!!). I was going to report this as a bug, however, someone with
more history (like yourself) should make that call.
Is this what is causing your problem?
Eric Everman
At 10/29/2002, you wrote:
>In Cocoon-1.8.2, I can handle parameters to XML
>as follows:
>
> http://b.c/Q/zzz.xml?color=red
>
>and I can recover the value of 'color' in zzz.xml with:
>
><xsp:logic>
> String colorParameter = request.getParameter("color");
></xsp:logic>
>
>But I have tried to duplicate the above with numerous incantations
>of sitemap (under cocoon/mount/MyProject) with no luck.
>
>How can I handle the above in Cocoon 2?
>
>(Windows XP, Apache 2, Tomcat 4.1.12(JK2:ajp13), Cocoon-2.0.3)
>
>Dave Biggar
>
>---------------------------------------------------------------------
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>FAQ before posting. <http://xml.apache.org/cocoon/faq/index.html>
>
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[sitemap] Passing parameters to XML
Posted by Dave Biggar <da...@sympatico.ca>.
In Cocoon-1.8.2, I can handle parameters to XML
as follows:
http://b.c/Q/zzz.xml?color=red
and I can recover the value of 'color' in zzz.xml with:
<xsp:logic>
String colorParameter = request.getParameter("color");
</xsp:logic>
But I have tried to duplicate the above with numerous incantations
of sitemap (under cocoon/mount/MyProject) with no luck.
How can I handle the above in Cocoon 2?
(Windows XP, Apache 2, Tomcat 4.1.12(JK2:ajp13), Cocoon-2.0.3)
Dave Biggar
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Re: xsp request variable is not declaired
Posted by Dave Biggar <da...@sympatico.ca>.
Your xsp page requires the cocoon processing instruction:
<?cocoon-process type="xsp"?>
I have also seen the <xsp:page> tag written:
<xsp:page language="java" xmlns:xsp="http://www.apache.org/1999/XSP/Core">
I am not clear if both are acceptable.
Dave
----- Original Message -----
From: "Eric Everman" <ev...@precedadesign.com>
To: <co...@xml.apache.org>
Sent: Monday, October 28, 2002 6:54 PM
Subject: Re: xsp request variable is not declaired
> At 10/28/2002, you wrote:
> >You do not appear to have declared `keyword'.
> >
> >i.e., try:
> >
> > String keyword = request.getParameter("value");
> >
> >Dave
>
>
> Ha, fair enough. But believe it or not, this is a copy/paste error. Here
> is the simplest xsp page that causes the problem (verbatim this time):
>
> =====================================================
> <?xml version="1.0"?>
> <xsp:page language="java" xmlns:xsp="http://apache.org/xsp">
>
> <xsp:logic>
> String keyword = request.getParameter("value");
> </xsp:logic>
>
> <content>
> The 'value' parameter was: <xsp:expr>keyword</xsp:expr>
> </content>
>
> </xsp:page>
> =====================================================
>
> This xsp causes a NPE:
> java.lang.NullPointerException
> at org.apache.cocoon.www.examples.db1_xsp.(D:\Program
Files\Apache
> Group\Tomcat
>
4.1\work\Standalone\localhost\cctest\cocoon-files\org/apache/cocoon/www/exam
ples\db1_xsp.java:62)
>
> Line 62 is "String keyword = request.getParameter("value");"
>
> Sorry for the initial mis-post. Any ideas?
>
> Eric Everman
>
>
> ---------------------------------------------------------------------
> Please check that your question has not already been answered in the
> FAQ before posting. <http://xml.apache.org/cocoon/faq/index.html>
>
> To unsubscribe, e-mail: <co...@xml.apache.org>
> For additional commands, e-mail: <co...@xml.apache.org>
>
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Re: xsp request variable is not declaired
Posted by Eric Everman <ev...@precedadesign.com>.
At 10/28/2002, you wrote:
>You do not appear to have declared `keyword'.
>
>i.e., try:
>
> String keyword = request.getParameter("value");
>
>Dave
Ha, fair enough. But believe it or not, this is a copy/paste error. Here
is the simplest xsp page that causes the problem (verbatim this time):
=====================================================
<?xml version="1.0"?>
<xsp:page language="java" xmlns:xsp="http://apache.org/xsp">
<xsp:logic>
String keyword = request.getParameter("value");
</xsp:logic>
<content>
The 'value' parameter was: <xsp:expr>keyword</xsp:expr>
</content>
</xsp:page>
=====================================================
This xsp causes a NPE:
java.lang.NullPointerException
at org.apache.cocoon.www.examples.db1_xsp.(D:\Program Files\Apache
Group\Tomcat
4.1\work\Standalone\localhost\cctest\cocoon-files\org/apache/cocoon/www/examples\db1_xsp.java:62)
Line 62 is "String keyword = request.getParameter("value");"
Sorry for the initial mis-post. Any ideas?
Eric Everman
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Re: xsp request variable is not declaired
Posted by Dave Biggar <da...@sympatico.ca>.
You do not appear to have declared `keyword'.
i.e., try:
String keyword = request.getParameter("value");
Dave
----- Original Message -----
From: "Eric Everman" <ev...@precedadesign.com>
To: <co...@xml.apache.org>
Sent: Monday, October 28, 2002 3:46 PM
Subject: xsp request variable is not declaired
> Hi Everyone-
>
> Here is a newbe question: I'm trying to use the implicit 'request'
> variable in a xsp page, however, whenever I try to access it like this I
> get a NPE error at line x:
>
> <xsp:logic>
> keyword = request.getParameter("value"); //line x
> </xsp:logic>
>
> When I attempt to access it like this, I get an "illegal start of type"
> error at line x:
>
> <xsp:logic>
> String comment = "";
>
> if (request == null) { //line x
> comment = "Request is null";
> } else {
> comment = "Request is NOT null";
> }
> </xsp:logic>
>
> This seems to point to 'request' as not having been declared, doesn't
> it? Doing something like this works:
>
> <xsp:logic>
> String keyword = "C";
> </xsp:logic>
> <content>
> <esql:connection>
> <esql:pool>cocoon</esql:pool>
> <esql:execute-query>
> <!-- <xsp-request:get-parameter name="value"/> -->
> <esql:query>select * from Resources where ResourceName like
> '%<xsp:expr>keyword</xsp:expr>%'</esql:query>
> <esql:results>
> <esql:row-results>
> <row>
> <esql:get-columns/></row>
> </esql:row-results>
> </esql:results>
> </esql:execute-query>
> </esql:connection>
>
> </content>
>
>
> Any ideas? This is driving me up the wall. I would post more of the
error
> code, config, etc, but it seems like this must be something major and
> (hopefully) obvious.
>
> Thanks,
>
> Eric Everman
>
>
>
> ---------------------------------------------------------------------
> Please check that your question has not already been answered in the
> FAQ before posting. <http://xml.apache.org/cocoon/faq/index.html>
>
> To unsubscribe, e-mail: <co...@xml.apache.org>
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>
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Re: xsp request variable is not declaired
Posted by Bert Van Kets <be...@vankets.com>.
Make sure you put your request inside a tag. Like this:
<xsp:page language="java" xmlns:xsp="http://apache.org/xsp"
xmlns:esql="http://apache.org/cocoon/SQL/v2"
xmlns:xsp-request="http://apache.org/xsp/request/2.0">
<data>
<xsp:logic>
your logic
</xsp:logic>
</data>
</xsp:page>
As you can see, I'm using the xsp-request logic sheet. Should be the same
though.
Bert
At 14:46 28/10/2002 -0600, you wrote:
>Hi Everyone-
>
>Here is a newbe question: I'm trying to use the implicit 'request'
>variable in a xsp page, however, whenever I try to access it like this I
>get a NPE error at line x:
>
><xsp:logic>
> keyword = request.getParameter("value"); //line x
></xsp:logic>
>
>When I attempt to access it like this, I get an "illegal start of type"
>error at line x:
>
><xsp:logic>
> String comment = "";
>
> if (request == null) { //line x
> comment = "Request is null";
> } else {
> comment = "Request is NOT null";
> }
></xsp:logic>
>
>This seems to point to 'request' as not having been declared, doesn't
>it? Doing something like this works:
>
><xsp:logic>
> String keyword = "C";
></xsp:logic>
><content>
><esql:connection>
> <esql:pool>cocoon</esql:pool>
> <esql:execute-query>
> <!-- <xsp-request:get-parameter name="value"/> -->
> <esql:query>select * from Resources where ResourceName like
> '%<xsp:expr>keyword</xsp:expr>%'</esql:query>
> <esql:results>
><esql:row-results>
><row>
><esql:get-columns/></row>
></esql:row-results>
> </esql:results>
> </esql:execute-query>
></esql:connection>
>
></content>
>
>
>Any ideas? This is driving me up the wall. I would post more of the
>error code, config, etc, but it seems like this must be something major
>and (hopefully) obvious.
>
>Thanks,
>
>Eric Everman
>
>
>
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