https://issues.apache.org/bugzilla/show_bug.cgi?id=47428
Summary: JSTL converts BigDecimal to Long
Product: Taglibs
Version: unspecified
Platform: PC
OS/Version: Windows Server 2003
Status: NEW
Severity: normal
Priority: P2
Component: Standard Taglib
AssignedTo: taglibs-dev@jakarta.apache.org
ReportedBy: hhf...@163.com
CC: hhf...@msn.com
<c:if test="{foo==0}">
do something
</c:if>
If foo is a BigDecimal,JSTL converts its type to Long,which means if foo is in
the range [0,1), for example,0.01,it always return true! That is not correct.
I checked SUN's JSP2.0 specification,in the JSP.2.3.5.7 section. It says:
A {==,!=,eq,ne} B
• If A==B, apply operator
• If A is null or B is null return false for == or eq, true for != or ne.
• If A or B is BigDecimal, coerce both A and B to BigDecimal and then:
If operator is == or eq, return A.equals( B )
If operator is != or ne, return !A.equals( B )
• If A or B is Float or Double coerce both A and B to Double, apply operator
• If A or B is BigInteger, coerce both A and B to BigInteger and then:
If operator is == or eq, return A.equals( B )
If operator is != or ne, return !A.equals( B )
• If A or B is Byte, Short, Character, Integer, or Long coerce both A and B to
Long, apply operator
• If A or B is Boolean coerce both A and B to Boolean, apply operator
• If A or B is String coerce both A and B to String, compare lexically
• Otherwise if an error occurs while calling A.equals(B), error
• Otherwise, apply operator to result of A.equals(B)
According to the third rule,it seems like no problem.
but when I checked apache's implementation of JSTL, in the class
org.apache.taglibs.standard.lang.jstl.Coercions,I found apache didn't implement
the third specification.so the preceding example will be processed according to
this rule:
If A or B is Byte, Short, Character, Integer, or Long coerce both A and B to
Long, apply operator
that is, it will convert BigDecimal to Long!
so, is this a bug or something?
looking forward to your answering.Thanks!
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