Showing label in custom validator

I created a new custom component implementing a custom validator. Here is how I call it in:

<p:inputText value="#{MyBean.value}" >
    <f:attribute name="label" value="#{ResourceBean.labels['label']}"/>

    <my:vali开发者_如何转开发dator error="#{ResourceBean.message['the.error.message']}" 
                  expression="#{ResourceBean.regExp['alphanumeric']}"/>
</p:inputText>

And here is the validate implementation

String val = value == null ? "" : value.toString();

if (!val.matches(getExpression())) {
    throw new ValidatorException(new 
              FacesMessage(FacesMessage.SEVERITY_ERROR,getErrorSummary(),null));

and the error message in property file:

the.error.message={0}\: is Invalid.

The problem is that the {0} in not replaced by the label in the error message thus I am getting as error message:

{0}: is Invalid.

Any ideas how to fix it?

You need to use MessageFormat API, like as JSF is doing under the covers.

String message = getErrorSummary();
String label = component.getAttributes().get("label");
String formattedMessage = MessageFormat.format(message, label);
throw new ValidatorException(new FacesException(formattedMessage));

Why are you expecting a different behavior? In the code posted I don't see where you are explicitly doing a token replace on the {0} substring of your error message.

I usually do something like the following:

String messageBody = stringBuffer.toString().replaceAll("\\{0\\}", firstName);

Or your string can utilize proper syntax for string token replacement for use in String's format method:

String.format("%s: is Invalid.", "token");