On Wed, May 16, 2001 at 12:32:59PM +0200, Martin Renner wrote:
> Hi.
>
> First of all: Sorry, but I was quite busy those last days. So it took some days to
> answer your mail.
>
> Toby wrote:
>
> >On Thu, May 10, 2001 at 03:58:23PM +0200, Martin Renner wrote:
> >>As far as I know, every instance variable of an EJB has to be serializable or
>marked
> >>as transient (because the EJB by itself is implementing java.io.Serializable).
> >>
> >
> > The relevent section of the spec (version 2.0pd2) is 6.4.1.
>
>
> Okay, I just was reading this section (btw: it's 6.4.1 in 2.0pd and 7.4.1 in
>2.0pfd2).
Doh! I was reading public draft 2 instead of public *final* draft 2.
>
> >>IMHO EJBContextImpl should be serializable so that I can hold a reference to it,
>or
> >>am I wrong?
>
>
> According to the spec, I was wrong :-)
>
> And now I know, why I got those NotSerializable exceptions:
>
> A method of my EJB returns a SortedSet. To create this SortedSet, I am using a
> TreeSet with a Comparator. This Comparator was an inner class of my EJB:
>
> public class MyEJB ...
> public SortedSet getSomething() {
> return new TreeSet(new MyComparator());
> }
>
> class MyComparator implements Comparator, Serializable {
> public int compare(Object o1, Object o2) {
> }
> }
> }
>
> When this SortedSet was returned to the client, the JVM returned the SortedSet AND
> its Comparator, because the comparator is an attribute of the TreeSet. So the JVM
> wanted to serialize the inner class (MyComparator) AND the EJB. Then, of course, I
> got an exception, that EntityContextImpl is not serializable.
>
> When I removed MyComparator from the EJB and turned it into a standalone class,
> everything worked fine. It also works fine, if I don't use a Comparator and all the
> elements of the SortedSet implement the Comparable interface.
You could make your inner class static, then it won't need to serialise its
containing instance.
Toby.
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