https://issues.apache.org/bugzilla/show_bug.cgi?id=45040
Summary: null string from web is converted to 0 in JSF
Product: Tomcat 6
Version: 6.0.16
Platform: All
OS/Version: All
Status: NEW
Severity: critical
Priority: P2
Component: Jasper
AssignedTo: [EMAIL PROTECTED]
ReportedBy: [EMAIL PROTECTED]
My Environment is JSF 1.2(sun RI)+facelet+tomcat 6.0.16. There is an integer
field in my web form. I monitored the submitted form using the tcpmon. The
value is indeed empty. Debugging confirmed that the submitted value is empty.
However, when it is "update model" in JSF, the value becomes Integer(0) while I
expect a null object. I traced the code down to AstValue.setValue()
line 1132: resolver.setValue(ctx, t.base, t.property,
// coerce to the expected type
ELSupport.coerceToType(value,
resolver.getType(ctx, t.base,
t.property)));
which calls
java/org/apache/el/lang/ELSupport.java
line 198: public final static Number coerceToNumber(final Object obj) {
line 199: if (obj == null) {
line 200: return ZERO;
The ELSupport here converts a null object to zero object. This makes it
impossible to differentiate "an empty field" from "a field with 0" from web in
JSF model object.
Maybe the setValue in AstValue should be changed to
resolver.setValue(ctx, t.base, t.property, value==null?null:
ELSupport.coerceToType(value,
resolver.getType(ctx, t.base, t.property)));
thanks
-jason
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