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Type: Bug
Resolution: Unresolved
Priority: Minor
Fix Version/s: 4.30.x
Affects Version/s: 4.4.2.Final
Component/s: jsf
Labels:
None
Environment:

Windows 10
Eclipse Neon.2 (4.6.2)
JBoss Tools 4.4.2.Final (Marketplace)
JavaEE 7

Steps to Reproduce:
Hide

<!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml" xmlns:h="http://xmlns.jcp.org/jsf/html" > <h:body> <h:outputText value="#{'foo' += 'bar'}" /> </h:body> </html>
Show
<!DOCTYPE html> <html xmlns= "http: //www.w3.org/1999/xhtml" xmlns:h= "http: //xmlns.jcp.org/jsf/html" > <h:body> <h:outputText value= "#{ 'foo' += 'bar' }" /> </h:body> </html>
QE Test Coverage:
-

The EL 3.0 specification [1] states

String Concatenation Operator - A += B
To evaluate A += B
■ Coerce A and B to String.
■ Return the concatenated string of A and B.

Used on a JSF Tag like

<h:outputText value="#{'foo' += 'bar'}" />

leads to following warning:

EL syntax error: Expecting expression.

on the = part of the += operator.