Date field - no date entered - conversion error

Hi,
i've a input text field with a datepattern attached in my jsp, whose requrired attribute is set to false. If i submit the page and no date is entered, JSF returns "Conversion error occured" for the date field.
For testing purposes i made a simple JSP which contains only this date field and a reload button, which only submits the form. When the button is clicked the conversion error is displayed as described.
What am i doing wrong here?
thx
brunft
<html>
<%@ page contentType="text/html" %>
<%@ taglib uri="http://java.sun.com/jsf/html" prefix="h" %>
<%@ taglib uri="http://java.sun.com/jsf/core" prefix="f" %>
<f:view locale="de">
<html>
 <head><title>Date test</title></head>
 <body>
 <h:form id="datetest">
 
 <h:inputText id="someDate" styleClass="formText" value="#{testDate.someDate}">
 <f:convertDateTime pattern="#{testDate.datePattern}" />
 </h:inputText>
 
 <h:commandButton id="refresh" styleClass="formButton"
 value="Reload"
 action="#{testDate.actionReload}" />
 
 <h:messages />
 </h:form>
 </body>
</html>
</f:view>The bean:
public class TestDate {
private Date someDate;
private static String datePattern = "dd.MM.yyyy";
public TestDate() {
public Date getSomeDate() {
 return this.someDate;
public void setSomeDate(Date someDate) {
 this.someDate = someDate;
public String getDatePattern() {
 return this.datePattern;
public String actionReload() {
 return "success";
}faces-config.xml:
<managed-bean>
 <description>Date test.</description>
 <managed-bean-name>testDate</managed-bean-name>
 <managed-bean-class>test.TestDate</managed-bean-class>
 <managed-bean-scope>request</managed-bean-scope>
</managed-bean>

You can try by deleting "pattern=="#{testDate.datePattern}"
<f:convertDateTime pattern="#{testDate.datePattern}" />

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