[jboss-user] [JBoss Seam] - Entity Injection question

[smithbstl]

Lets say I have an input field in a page


  | <h:inputText value="#{someEntity.someProperty}"/>
  | <h:commandButton actionListener="#{foo.submit}"/>
  | 


  | @Stateful
  | @Name("foo")
  | public class foo {
  | 
  | @In(required=false)
  | SomeEntity someEntity;
  | 
  | @Logger
  | Log log;
  | 
  | public void submit() {
  | if (someEntity != null) {
  |    log.debug("Entity IS NOT NULL");
  | else {
  |    log.debug("Entity IS NULL");
  | }
  | }
  | 

Since I am referencing a property of someEntity in my page, the entity is automatically instantiated using its no arg constructor, even though I have not specified @In(create=true), correct?  There is never a case where someEntity will be null.

I have a page where I have a number of these types of inputs that are optional.  Even if I do not enter anything in the input component and its the only component that refers to a particular entity, I still get non null values when the entity is submitted.  All of the properties of the entity are null but the object itself has been created by Seam.

I end up having to do this instead

public void submit() {
  | if (someEntity.someProperty != null) {
  |    log.debug("Entity's Property IS NOT NULL");
  | else {
  |    log.debug("Entity's Property IS NULL");
  | }
  | }

I understand this behavior but it just seems a little counter intuitive to someone trying to learn the basics of bijection.

I am just making sure I understand it.  So am I going to have to check properties like this to clarify if an object is "functionally null" (all properties are null)?

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