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<!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>
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<!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.