I am starting a series of things you should not do:
Seam has this handy annotation: @Synchronized which ensures that only a single thread may access the methods/fields of the component at the same time.
Often times it is easy to forget that SESSION scoped Seam components are automatically @Synchronized
Java has this (formerly) handy modifier synchronized which when applied to a method, ensures that the object’s implicit lock is held whenever the method is invoked.
Hilarity will ensue if you have an @Synchronized component with synchronized methods (which you should not have to apply because the component is @Synchronized), e.g.
@Name(“donny”)
@Scope(ScopeType.SESSION)
public class DonnyDont {
public synchronized String dont() {
// some stuff
}
}