Try

        @Persistent(defaultFetchGroup = "true")

on anything that's not listed in the Core Value Types table on 
http://code.google.com/appengine/docs/java/datastore/dataclasses.html


Jolam wrote:
> This is the object:
> _______________
> 
> @PersistenceCapable(identityType = IdentityType.APPLICATION,
> detachable = "true")
> public class Client implements java.io.Serializable {
> 
> ........
> 
>       @Persistent
>       private ArrayList<OneService> serviceRecords;
> 
>       @Persistent
>       private ArrayList<OneService> serviceNow;
> 
>       @Persistent
>       private String remarks;
> 
> ......
> 
>       public ArrayList<OneService> getServiceRecords() {
>               return serviceRecords;
>       }
> 
>       public void setServiceRecords(ArrayList<OneService> serviceRecords) {
>               this.serviceRecords.clear();
>               for (int i = 0; i < serviceRecords.size(); i++) {
>                       this.serviceRecords.add(serviceRecords.get(i));
>               }
>       }
> 
>       public ArrayList<OneService> getServiceNow() {
>               return serviceNow;
>       }
> 
>       public void setServiceNow(ArrayList<OneService> serviceNow) {
>               this.serviceNow.clear();
>               for (int i = 0; i < serviceRecords.size(); i++) {
>                       this.serviceNow.add(serviceNow.get(i));
> 
> when i try to make this kind of Object pesistent like this:
> _______________________________________________
> 
> ArrayList<OneService> serviceNow = new ArrayList<OneService>();
> serviceNow.add(oneservice);
> client.setServiceNow(serviceNow);
> _______________________________________________
> 
> the ArrayList "serviceNow" in the Object doesn't contains another
> object "oneservice" i want to add into the ArrayList"serviceNow".
> 
> p.s. my english is bad and if it makes u confused because of my poor
> expression,i beg your pardon.
> 
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