But my question was why am I NOT getting the NullPointerException. In my case I am NOT getting the exception, I am getting an empty string for a method that returns String and false for a method that returns boolean.
-----Original Message----- From: Heath Borders [mailto:[EMAIL PROTECTED] Sent: Tuesday, January 18, 2005 1:37 PM To: MyFaces Discussion Subject: Re: How are the null objects handled in value bindings Here is what happens when you use a ValueBinding like that: MyFaces checks the request, session, and application maps for a bean named "manageProfileFace". If it is in any of those, it returns it, if not, it creates it and returns it. MyFaces checks the "manageProfileFace" for a "bioHelper" property (specifically for a getBioHelper() method). MyFaces calls the getBioHelper() method MyFaces checks the object returned from getBioHelper() for getSpouse() MyFaces calls getSpouse() MyFaces checks the object returned from getSpouse() for getFirstName() MyFaces calls getFirstName() The value from getFirstName() is what is passed to the outputText. Essentially, you can think of it as the following java code: manageProfileFace.getBioHelper().getSpouse().getFirstName(); If getSpouse() returns null, it is obvious why a NullPointerException would be thrown. On Tue, 18 Jan 2005 12:15:04 -0500, Srikanth Madarapu <[EMAIL PROTECTED]> wrote: > Hi > > I have the following line in my jsp... > > <h:outputText id="spouse" > value="#{manageProfileFace.bioHelper.spouse.firstName}"/> > > The object "spouse" is null. But I am not getting a NullPointerException !! > Why? Does the JSF handle nulls and does not throw an exception ? What happens > in case if the method returns a boolean ? For example.. > > <h:outputText id="spouse" > value="#{manageProfileFace.bioHelper.spouse.exists}"/> > > In my situation isExists is always returning false if "spouse" is null. > > Please help > > TIA. > -Srikanth Madarapu > > -- -Heath Borders-Wing [EMAIL PROTECTED]
