I have situation where I share singleton between my code which runs the embedded-server and my web-application. I have war with classes and deployment tool. When I printf instances I see:
abc.Abc@173a10f
abc.Abc@105738
So this is not really singleton. How this works?
My server Jetty start code:
public static void main(String[] args) throws Exception
{
System.out.println(MySingleton.getInstance());
// start Jetty here and deploy war with WebAppContext()
}
My ServletContextListener
side code:
public class AppServletContextListener implements ServletContextListener{
@Override
public void contextInitialized(ServletContextEvent arg0) {
System.out.println(MySingleton.getInstance());
}
}
My singleton:
public class MySingleton {
private static MySingleton INSTANCE = new MySingleton();
private MySingleton () {}
public static MySingleton getInstance() {
return INSTANCE;
}
}
I forced exception inside constructor. It looks like I get two different.
java.lang.Exception
at api.MySingleton.<init>(MySingleton.java:33)
at api.MySingleton.<clinit>(MySingleton.java:22)
at my.project.StartJetty.main(StartJetty.java:41)
java.lang.Exception
at api.MySingleton.<init>(MySingleton.java:33)
at api.MySingleton.<clinit>(MySingleton.java:22)
at api.AppServletContextListener.contextInitialized(AppServletContextListener.java:25)
at org.eclipse.jetty.server.handler.ContextHandler.startContext(ContextHandler.java:640)
at org.eclipse.jetty.servlet.ServletContextHandler.startContext(ServletContextHandler.java:229)
at org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1208)
at org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:586)
at org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:449)
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:58)
at org.eclipse.jetty.server.handler.HandlerCollection.doStart(HandlerCollection.java:224)
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:58)
at org.eclipse.jetty.server.handler.HandlerWrapper.doStart(HandlerWrapper.java:89)
at org.eclipse.jetty.server.Server.doStart(Server.java:258)
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:58)
at my.project.StartJetty.main(StartJetty.java:66)