I have a class which has a counter field.
public Class Foo implements Serializable {
private static final long serialVersionUID = 1L;
private int counter = 0;
// getter and setter omitted for simplicity
}
And in my program I put a Foo instance into HttpSession.
HttpSession session = request.getSession(true);
Foo foo = (Foo)session.getAttribute("foo");
if (foo==null) {
foo = new idv.Foo();
session.setAttribute("foo", foo);
}
else
foo.setCounter(foo.getCounter()+1);
// continue processing with foo
If session.setAttribute is executed, the session (and foo) is
serialized correctly and I can get the correct counter value at the
next request. But the counter value never gets increased at subsequent
requests.
If I move the session.setAttribute call to behind the if-else block
to force execution in every request, the counter value increases
correctly.
if (foo==null)
foo = new idv.Foo();
else
foo.setCounter(foo.getCounter()+1);
session.setAttribute("foo", foo);
I didn't see any doc about this. Is it a bug or a feature?
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