Spaces in the inputText field

Hi,
Iam not sure of how best I can explain the problem I experience on my JSF pages.
When i try to select a value from the drop down list..it is populating other fields on the page perfectly.
One of the fields is Zipcode which has a validator on it
Zip Code:
<h:inputText id="text5" maxlength="5" size="5" immediate="true"
value="#{processApplication.ownerZipcode}">
<f:validator validatorId="zipcodeValidator"/></h:inputText>
<h:message for="text5" /> When i make any changes and hit save button on the page...(Most of the times) I get a red color msg beside the zipcode field "Zipcode not valid" eventhough that field is blank.
But, the cursor on that field is in the middle of the field which makes zipcodeValidator trigger becoz it cannot take any spaces.
when i place the cursor to the front of the field and hit save...everythiing is fine.
Why does the zipcode inputText field adds those spaces all by itself?
Any clue?
Any help is really really appreciated.

Thanks BalusC!!
Let me be more clear with this issue.
I have four inputText fields with required = "#{param['form1:button3'] == 'Issue License'}"When I click on a link...
These 4 text fields get the data(if any) from the database.
Now, when I click on the "Issue License" command button , I should check if these 4 fields are not null.
If any one of them is null, then I get the message "required field is missing" and I fill that field accordingly.
Now, the problem is....
When I click on a link...I noticed that the first field added few spaces by itself since the cursor is in the middle of the inputText box. Other 3 fields are normal and blank too i.e., all 4 fields did'nt get any data from DB.
When I click "Issue License" command button, I get "required field is missing" msg, only for 3 inputText fields but not for the first one since the first one has already few spaces in it and the required attribute thinks it has some value in it.
Now, how should I handle this situation?
Do you think
creating a converter for java.lang.String which converts empty/spacy strings to null would solve the problem?
This happens in few other pages too.
Please suggest me the solution.
Thanks

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