https://issues.apache.org/bugzilla/show_bug.cgi?id=50500
Summary: EL evaluation of floating-point String value vs
BigInteger loses precision
Product: Tomcat 7
Version: trunk
Platform: All
OS/Version: All
Status: NEW
Severity: minor
Priority: P2
Component: Jasper
AssignedTo: dev@tomcat.apache.org
ReportedBy: knst.koli...@gmail.com
According to the EL spec ch.1.7.1,
the A+B,A-B,A*B expressions when A is a "String containing ., e, or E" and B is
a BigInteger have to be evaluated as follows:
"coerce both A and B to BigDecimal and apply operator"
The actual implementation though, instead of coercing A as String ->
BigDecimal, does two coercions: String -> Double -> BigDecimal, which produces
a different result.
To reproduce, run the following JSP page:
<%
pageContext.setAttribute("a", "1.1");
pageContext.setAttribute("b", new
java.math.BigInteger("1000000000000000000000"));
// "c" is used to explicitly coerce arguments to BigDecimal
pageContext.setAttribute("c", new java.math.BigDecimal("0"));
%>${a + b}<br>
${(a+c) + (b+c)}<br>
${a - b}<br>
${(a+c) - (b+c)}<br>
${a * b}<br>
${(a+c) * (b+c)}
Actual result:
1000000000000000000001.100000000000000088817841970012523233890533447265625
1000000000000000000001.1
-999999999999999999998.899999999999999911182158029987476766109466552734375
-999999999999999999998.9
1100000000000000088817.841970012523233890533447265625000000000000000000000
1100000000000000000000.0
Expected result:
1000000000000000000001.1
1000000000000000000001.1
-999999999999999999998.9
-999999999999999999998.9
1100000000000000000000.0
1100000000000000000000.0
I think it is a minor issue, though.
This is reproducible in the current tc6.0.x as well.
Maybe o.a.el.lang.ELArithmetic#add(Object, Object) should delegate to
BIGDECIMAL instead of DOUBLE with these types of arguments.
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