Forcing Case Conversion in Databound Components

Question

Has anyone found a good way for forcing case conversion of input data in a data-bound text field?
I am trying to figure out how to force conversion of input data to upper case without having to create a validator and throwing an error when the user uses lower case.
Thanks

Answer 1

Unfortunately, using UPPER() in the rowset query is not possible when the rowset is updatable.
To solve the problem, I ended up writing a very simple custom converter which converts the entered text to uppercase. Code follows:
* UpperCaseConverter.java
* Created on July 26, 2005, 8:18 AM
package cms.jsf.common;
import javax.faces.component.*;
import javax.faces.context.*;
import javax.faces.convert.*;
import java.text.*;
import javax.faces.application.*;
* @author julianray
public class UpperCaseConverter implements Converter {
protected static final String NULL_FORMAT = "";
/** Creates a new instance of PhoneNumberConverter */
public UpperCaseConverter() {
public Object getAsObject(FacesContext facesContext, UIComponent uIComponent, String str) throws ConverterException {
if ((str == null) || (str.length() == 0)) {
return NULL_FORMAT;
return str.toUpperCase();
public String getAsString(FacesContext facesContext, UIComponent uIComponent, Object obj) throws ConverterException {
     if (obj == null) {
return NULL_FORMAT;
     // make sure that we can cast the input type to a string
     try {
String str = (String) obj;
return str.toUpperCase();
} catch (ClassCastException e) {
     //FacesMessage errMsg = MessageFactory.getMessage(1, (new Object[] {obj, str}));
throw new ConverterException("Error converting input value to String.");
}