Thanks for your answer.
@Startup @Create. is create a Component instance.I can't do it in my listener class.
I had find some useful information for my problem。

@Name("dbCache")
public class DbCache {
     
     @Observer("org.jboss.seam.postInitialization")
     public void cache() {
        。。。。。。
       }
}

When Seam initialized，the method cache() will be call.