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From bugzi...@apache.org
Subject DO NOT REPLY [Bug 19382] New: - EL to String conversion outputs "0"
Date Mon, 28 Apr 2003 11:12:51 GMT
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http://nagoya.apache.org/bugzilla/show_bug.cgi?id=19382

EL to String conversion outputs "0"

           Summary: EL to String conversion outputs "0"
           Product: Tomcat 5
           Version: Nightly Build
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Severity: Normal
          Priority: Other
         Component: Unknown
        AssignedTo: tomcat-dev@jakarta.apache.org
        ReportedBy: erik@beijnoff.com


When an EL expression evaluates to null, the output is "null" when it isn't 
added togheter with something. When a try to add the empty EL parameter to an 
empty String, the value output is "0".


CASE 1:
This data:
<body onload="${param.onload}">	

Outputs this:
<body onload="null">

I'm not 100% on the case above. According to 7.1 "Coerce A to String" in the 
JSTL specification, this behavior is incorrect. The value output should be "". 
BUT if the part shown above belongs in section 7.4 "Coerce A to any other type 
T", the behavior is correct.



CASE 2:
This data:
<body onload="${param.onload + ''}">	

Outputs this:
<body onload="0">

This behavior is clearly wrong. The output should be "", according to section 
7.1 "Coerce A to a string". The value output now is "0".

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