Can we share CDI @ApplicationScoped bean instance accross web application in the same EAR?

问题

I have an JavaEE Application that has 2 web applications. I also have another library web module that contains common_bean that annotated by @ApplicationScoped

My question is: Can I share common_bean instance across the two web applications?

Updated - I did the test

In Web App1 (/web1)

@WebServlet("/Servlet1")
public class Servlet1 extends HttpServlet {

@Inject
CommonBean commonBean;


protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    commonBean.setValue("Servlet1: " + System.currentTimeMillis() + "--" + commonBean);
}
}

In Web App2 (/web2)

@WebServlet("/Servlet2")
public class Servlet2 extends HttpServlet {

@Inject
CommonBean commonBean;


protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    commonBean.setValue("Servlet2: " + System.currentTimeMillis() + "--" + commonBean);
}
}

The Result

If I run /Web1/Servlet1 FIRST then Run /Web2/Servlet2:

/Web1/Servlet1 ------- Worked

/Web2/Servlet2 ------- Failed with CDI exception
If I run /Web2/Servlet2 FIRST then Run /Web1/Servlet1: ( Restart server then re-test)

/Web2/Servlet2 ------- Worked

/Web1/Servlet1 ------- Failed with CDI exception

Any comments!

回答1:

I found the issue. I like to post the solution here. It may help someone:

The solution is: Configure the Web library module as EAR Module Assembly (Lib jar module) - By doing this, only instance of Common bean created and this instance will be shared across all web applications in the same EAR.

I am not sure this is a specification of CDI or NOT but it worked on both Glassfish & Wildfly.

来源：https://stackoverflow.com/questions/28281314/can-we-share-cdi-applicationscoped-bean-instance-accross-web-application-in-the

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java

cdi