EL should coerce String to Integer in equals operation ------------------------------------------------------ Key: WFLY-12947 URL: https://issues.redhat.com/browse/WFLY-12947 Project: WildFly Issue Type: Bug Components: EE Affects Versions: 18.0.1.Final Reporter: Ricardo Martin Camarero Assignee: Ricardo Martin Camarero Priority: Major Fix For: 19.0.0.Beta3, 20.0.0.Beta1 EAP 7's EL equals operations work differently from EAP 6 one. For example: put the following JSP in your web application (e.g. example.war) {code:java|title=test.jsp} <% request.setAttribute("testAttr", "01"); %> ${testAttr == 1}</br> ${param['foo'] == 1}<br> ${1 == param['foo']}<br> ${1 == (0+param['foo'])}<br> {code} Then, access the above JSP with curl command: {code} $ curl http://localhost:8080/example/test.jsp?foo=01 {code} - Expected result (EAP 6's behavior): {code} true<br> true<br> true<br> true<br> {code} - Actual result (EAP 7's behavior): {code} false<br> false<br> false<br> true<br> {code} In the section 1.9.2 of [EL 3.0 Specification|https://download.oracle.com/otndocs/jcp/el-3_0-fr-eval-spec...], the ==,!= operators have the following step: {code} ■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 an enum, coerce both A and B to enum, 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) {code} Note that the step "If A or B is Byte, Short, Character, Integer, or Long coerce both A and B to Long, apply operator" should happen earlier than the step coercion to String. So, it appears that EAP 7's behavior violates the spec.