Currently DomBasicRenderer.java class does not support detection of global String converters in an application. It is designed in such way that it always returns a String value before detecting a global custom String converter. (line 205@ DomBasicRenderer.java)

201 if (converter == null) {
202 if (currentValue == null) {
203 return "";
204 } else if (currentValue instanceof String) {
205 return (String) currentValue;
206 }
207
208 converter = getConverterForClass(currentValue.getClass());
209
210 if (converter == null) {
211 return currentValue.toString();
212 }
213 }

a fix below is proposed by one of our clients to allow detection of such converters in application:

...
if (converter == null) {
if (currentValue == null) {
return "";
} else if (currentValue instanceof String) {

// Addition for global String converter detection.

converter = getConverterForClass(currentValue.getClass());
if (converter == null) {
return (String) currentValue;
} else {
return converter.getAsString(facesContext, uiComponent, currentValue);
}
}

converter = getConverterForClass(currentValue.getClass());

if (converter == null) {
return currentValue.toString();
}
}
...

We need to review proposed fix and determine if it can be safely incorporated into our code.