Primefaces dataTable call method multiple times when click commandButton. why?

Question

<p:commandButton value="Get Name List" update="nameinfo"/>
<p:dataTable id="nameinfo" var="nam" value="#{namefinder.dofind}"></p:dataTable>

• "namefinder" is managed bean [ @ManagedBean(name = "namefinder")]

• "dofind" is the method which find the name list and it return the value as namefinder class object list

  Problem is: "dofind" method is call 7 times.

  why doing like this?

Answer 1

Because this is the way JSF is working, and this is correct according to Java Bean principles. Getter can be called multiple times, as much as the caller wishes.

The value attribute of p:dataTable expects getter method and is calling that method multiple times. You can't guarantee how many times will a getter be called. Instead, you should do no logic in getter method.

Instead, provide the method that will be called by your p:commandButton and refresh the collection there. dofind should be the field of JavaBean with the list of rows, no logic should be done there.