h:selectOneMenu with values from an enum becomes null after reload - jsf

Question

I followed the advice from How to use enum values in f:selectItem(s) to build a h:selectOneMenu that takes the values of an enum. This works fine until I reload the page.
If I reload the page (Strg+R) what a user could do, the #{bean.relationship} property becomes null. All other properties, such as strings, numbers, etc. remain as they were before (Bean is #ViewScoped and #ManagedBean).
Here is the code from the JSF:
<h:selectOneMenu value="#{bean.relationship}">
<f:selectItems value="#{bean.relationshipTypes}"
var="types" itemValue="#{types}" itemLabel="#{types}" />
</h:selectOneMenu>
<h:inputText value="#{bean.name}" />
Here the code from the Enum:
public enum RelationshipType {
Family,
Friend
}
Here the code from the Bean:
private RelationshipType relationship; // plus getter & setter
private RelationshipType[] relationshipTypes;
private String name; // plus getter & setter
public RelationshipType[] getRelationshipTypes() {
return RelationshipType.values();
}
The enum is part of a larger entity. For ease of display a shortend version. Any idea?
#Geinmachi: Yet, other values stored in the bean are still there after the reload (e.g. name). So, why not for the property related to the enum?

Answer 1

I have used enums for data types
Enum
public enum Datatypes {
INT("Int"), FLOAT("Float"), DOUBLE("Double"), STRING("String"), DATE("Date"), DATETIME(
"DateTime"), BLOB("Blob");
private final String dataType;
private Datatypes(String dataType) {
this.dataType = dataType;
}
public String getDataType() {
return this.dataType;
}
#Override
public String toString() {
return dataType;
}
}
Bean
private List<Datatypes> datatypes = Arrays.asList(Datatypes.values());
public List<Datatypes> getDatatypes() {
return datatypes;
}
public void setDatatypes(List<Datatypes> datatypes) {
this.datatypes = datatypes;
}
xhtml
<p:selectOneMenu value="#{bean.dataType}">
<f:selectItem itemLabel="Select Data type"/>
<f:selectItems value="#{bean.dataTypes}" />
</p:selectOneMenu>
it working for me.