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From: bugzilla@apache.org
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Cc: 
Subject: DO NOT REPLY [Bug 28017] New:  -
    xsp: generating a XSP computed attribute does not work for ROOT element
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http://issues.apache.org/bugzilla/show_bug.cgi?id=28017

xsp: generating a XSP computed attribute does not work for ROOT element

           Summary: xsp: generating a XSP computed attribute does not work
                    for ROOT element
           Product: Cocoon 2
           Version: 2.1.4
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Severity: Normal
          Priority: Other
         Component: core
        AssignedTo: dev@cocoon.apache.org
        ReportedBy: wouter.deruyck@cec.eu.int


I have experienced some problems generating xml with some computed attributes 
in the root element.

If I try to execute this:

<?xml version="1.0" encoding="UTF-8"?>

<xsp:page xmlns:xsp="http://apache.org/xsp"

xmlns:xsp-request="http://apache.org/xsp/request/2.0"

xmlns:esql="http://apache.org/cocoon/SQL/v2"

xmlns:xsp-session="http://apache.org/xsp/session/2.0"

xmlns:i18n="http://apache.org/cocoon/i18n/2.1"

create-session="true">

 

<!-- this is working fine -->

<xsp:logic>

String dummy = "aaa";

String s = (String)(request.getParameter("test"));

</xsp:logic>

<dum2>

<xsp:attribute name="key"><xsp:expr>s</xsp:expr>

</xsp:attribute>

</dum2>

</xsp:page>

Execution result is an error because if you look at generated code, the 
request String object is generated as a class attibute and can't be initialize 
because the request object is null. 

:

 

Internal Server Error

Message: Language Exception

Description: org.apache.cocoon.ProcessingException: Language Exception: 
org.apache.cocoon.components.language.LanguageException: Error while 
instantiating org\apache\cocoon\www\dummy_xsp: java.lang.NullPointerException

Sender: org.apache.cocoon.servlet.CocoonServlet

Source: Cocoon Servlet

Request URI

dummy/bb

cause

java.lang.NullPointerException

request-uri

/cocoon/dummy/bb

full exception chain stacktrace

Original Exception: org.apache.cocoon.components.language.LanguageException: 
Error while instantiating org\apache\cocoon\www\dummy_xsp: 
java.lang.NullPointerException


 

Second try:

Then I thought about moving the logic code after the root tag, and hoped my 
logic being moved in the generate method:

<?xml version="1.0" encoding="UTF-8"?>

<xsp:page xmlns:xsp="http://apache.org/xsp"

xmlns:xsp-request="http://apache.org/xsp/request/2.0"

xmlns:esql="http://apache.org/cocoon/SQL/v2"

xmlns:xsp-session="http://apache.org/xsp/session/2.0"

xmlns:i18n="http://apache.org/cocoon/i18n/2.1"

create-session="true">

 

<!-- this is working fine -->

 

<dum2>

<xsp:logic>

String dummy = "aaa";

String s = (String)(request.getParameter("test"));

</xsp:logic>

<xsp:attribute name="key"><xsp:expr>s</xsp:expr>

</xsp:attribute>

</dum2>

</xsp:page>

 

 

This failed with a compilig error:

 

Internal Server Error

Message: Language Exception

Description: org.apache.cocoon.ProcessingException: Language Exception: 
org.apache.cocoon.components.language.LanguageException: Error compiling 
dummy_xsp: ERROR 1 
(org\apache\cocoon\www\dummy_xsp.java): ... "", "key", "key", "CDATA", // 
start error (lines 298-298) "s cannot be resolved" String.valueOf(s) + " " // 
end error ); this.contentHandler.startElement( ... Line 298, column 0: s 
cannot be resolved

Sender: org.apache.cocoon.servlet.CocoonServlet

Source: Cocoon Servlet

Request URI

dummy/bb

cause

org.apache.cocoon.components.language.LanguageException: Error compiling 
dummy_xsp:

ERROR 1 (org\apache\cocoon\www\dummy_xsp.java):

...

"",

"key",

"key",

"CDATA",

// start error (lines 298-298) "s cannot be resolved"

String.valueOf(s) + " "

// end error

);


this.contentHandler.startElement(

...

Line 298, column 0: s cannot be resolved

 

This is because the generation of the attibute 

xspAttr.addAttribute(

"",

"key",

"key",

"CDATA",

String.valueOf(s) + " "

);

is done after the declaration of the s variable!!!

If I move the code a little bit forward in the attribute tag I also 
experienced that problem.

The only "turnaround" I found is putting an "artificial" root element like 
here under and remove it afterword but it causes other troubles

in my following treatments: 

 

 

<?xml version="1.0" encoding="UTF-8"?>

<xsp:page xmlns:xsp="http://apache.org/xsp"

xmlns:xsp-request="http://apache.org/xsp/request/2.0"

xmlns:esql="http://apache.org/cocoon/SQL/v2"

xmlns:xsp-session="http://apache.org/xsp/session/2.0"

xmlns:i18n="http://apache.org/cocoon/i18n/2.1"

create-session="true">