@Observer methods may be called multiple times
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Key: JBSEAM-3983
URL:
https://jira.jboss.org/jira/browse/JBSEAM-3983
Project: Seam
Issue Type: Bug
Components: Core
Affects Versions: 2.1.1.GA
Reporter: Vanessa Williams
Some @Observer methods may be called multiple times, while others may not be called at
all. This bug is reproducible; occurs in both 2.1.0 and 2.1.1 and requires specific
circumstances (described below.)
I do not have the time (unfortunately) to create a sample project to demonstrate the
problem, but it is easy enough to describe.
Create an EntityHome<E> subclass, let's call it FooHome.java. Override the
persist() method and at the end of it, raise an event, say "fooSaved". Now, in
the same class create a method postFooSaved() and annotate it with
@Observer("fooSaved"). In any other component you like, create another @Observer
method, with a different name, say watchFoo(), observing the same event. In this case,
everything works as expected. After FooHome.persist() is called, postFooSaved() and
watchFoo() will each be executed once.
Now to replicate the bug: create a subclass of FooHome.java, say BarHome.java. It
doesn't matter what it contains. Now postFooSaved() will be executed twice and
watchFoo() will not be executed at all.
As an extended demonstration, create an action component called FooAction.java and move
the original postFooSaved() @Observer to that class. Again, all will work as expected,
with postFooSaved() and watchFoo() each executing once. Now create a subclass of
FooAction: BarAction.java. The bug will re-appear, with postFooSaved() executing twice and
watchFoo() not executing at all.
Hope that helps.
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