https://issues.apache.org/bugzilla/show_bug.cgi?id=52666
Bug #: 52666
Summary: EL should coerce String to Integer in equals operation
Product: Tomcat 7
Version: 7.0.25
Platform: PC
OS/Version: Windows XP
Status: NEW
Severity: normal
Priority: P2
Component: Jasper
AssignedTo: [email protected]
ReportedBy: [email protected]
Classification: Unclassified
This issue was reported on the users@ list, thread:
"EL String -> int coercion stopped working after TC 5.5 -> 7.0 upgrade?"
http://tomcat.markmail.org/thread/a7l45meiakblxcvz
http://marc.info/?t=132918931400002&r=1&w=2
Original reporter used <c:out> tag, but it is not necessary to reproduce the
issue.
The issue is reproducible in current 7.0 and 6.0. It works correctly in 5.5.35.
To reproduce,
1. save the following JSP page as ROOT/test.jsp
[[[
${param['foo'] == 1}<br>
${1 == param['foo']}<br>
${1 == (0+param['foo'])}<br>
]]]
2. go to http://localhost:8080/test.jsp?foo=01
Expected result:
true
true
true
Actual result:
false
false
true
This happens for foo=01, 001 etc. The equals result happens only when foo=1
According to EL 2.2 specification chapter 1.8.2 the ==,!= operators have the
following step: "If A or B is Byte, Short, Character, Integer, or Long coerce
both A and B to Long, apply operator". This step should happen earlier than
coercion to String.
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