Weld CDI, PostContruct Annotated Method Called Before Objects Are Injected

[Roger Wegmann]

Hi,

I use Apache Tomcat 9.0.68 and Weld 3.19.Final. I created a servlet that 
uses @Inject to inject a simple application scoped Java object. I also 
annotated a method with @PostConstruct. The problem is now, that the 
method annotated with @PostConstruct is called before the Java object 
has been injected.

import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebServlet( urlPatterns = { "/test" } )
public class TestServlet extends HttpServlet {

        private static final long serialVersionUID = -2770072595708915532L;

        private TestBean testBean;

        @Inject
        public void setTestBean( TestBean testBean ) {
                System.out.printf( "inject: %s%n" , this );
                this.testBean = testBean;
        }

        public TestBean getTestBean() {
                return testBean;
        }

        @PostConstruct
        public void postConstruct() {
                System.out.printf( "post construct: %s, %s%n", testBean, this );
        }

        @Override
        public void init() throws ServletException {
                super.init();
                System.out.printf( "init: %s, %s%n", testBean, this );
        }

        @Override
	protected void doGet( HttpServletRequest req, HttpServletResponse resp 
) throws ServletException, IOException {
                resp.setContentType( "text/plain" );
                resp.getWriter().printf( testBean == null ? "is null" : 
testBean.get() );
        }

}

The order and the output of the methods is the following:

post construct: null, com.eurospider.cpm.kyc.crif.TestServlet@733058ac
inject: com.eurospider.cpm.kyc.crif.TestServlet@733058ac
init: com.eurospider.cpm.kyc.crif.TestBean@52f8f92b, 
com.eurospider.cpm.kyc.crif.TestServlet@733058ac

I see that the class org.apache.catalina.core.DefaultInstanceManager on 
line 226 calls the post construct annotated method of my servlet. But at 
this point Weld didn't inject any beans into the servlet.

Is there a way to configure tomcat or weld so that the order of the 
called method is correct according to the CDI 2.0 specification in 
chapter 19.3.2.

Kind regards,

Roger Wegmann


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