0003863: @Singleton injection

3863

minor

always

01-28-10 09:19

02-10-10 17:12

Reporter:

ferg

Platform:

Assigned To:

ferg

OS:

Priority:

normal

OS Version:

Status:

closed

Product Version:

4.0.2

Product Build:

Resolution:

fixed

Projection:

none

ETA:

none

Fixed in Version:

4.0.4

Summary:

0003863: @Singleton injection

Description:

(rep by Wesley Wu)

When a @ApplicationScoped/@Singleton bean is designed to be initialized
after webapp starts (I.E. when first http request was fired) instead of being
initialized during startup stage, in given circumstance, it won't be
injected correctly.

This is my test case:

========== StartBean ===========
public class StartBean {
    @Inject
    FirstBean firstBean;
}
========== FirstBean ===========
public class FirstBean {
    @Inject
    SecondBean secondBean;
}
========== SecondBean ===========
public class SecondBean {
    @Inject
    ThirdBean thirdBean;
    @Inject
    FourthBean fourthBean;
}
========== ThirdBean ===========
public class ThirdBean {
    @Inject
    SingletonBean singletonBean;
}
========== FourthBean ===========
public class FourthBean {
    @Inject
    SingletonBean dao;
}
========== SingletonBean ===========
@Singleton
//@Startup
public class SingletonBean {
}
========== MyServlet ===========
public class MyServlet extends HttpServlet {
    @Inject
    StartBean startBean;

    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        System.out.println("hello");
    }
}

========= web.xml ===========
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee" [^]
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" [^]
           xsi:schemaLocation="http://java.sun.com/xml/ns/javaee [^]
          http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" [^]
           version="2.5">

    <servlet id="MyServlet">
        <servlet-name>MyServlet</servlet-name>
        <servlet-class>com.mycompany.servlet.MyServlet</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>MyServlet</servlet-name>
        <url-pattern>/MyServlet</url-pattern>
    </servlet-mapping>
</web-app>

=================================

The "http://localhost:8080/MyServlet" [^] request will produce this exception:

com.mycompany.servlet.MyServlet.startBean:
com.mycompany.beans.StartBean.firstBean:
com.mycompany.beans.FirstBean.secondBean:
com.mycompany.beans.SecondBean.fourthBean:
com.mycompany.beans.FourthBean.singletonBean:
java.lang.IllegalArgumentException:
Can not set com.mycompany.beans.SingletonBean field
com.mycompany.beans.FourthBean.singletonBean
to com.mycompany.beans.FourthBean

When I annotate the SingletonBean as @Startup, it's fine. (uncomment
the //@Startup line in SingletonBean.java)

Either @Singleton or @ApplicationScoped throws the exception.

It's a weird bug, taking me nearly two days to reproduce it in such a
simple test case.

Steps To Reproduce:

Additional Information:

Relationships

Attached Files:

Mantis - Resin
Viewing Issue Advanced Details

ID:	Category:	Severity:	Reproducibility:	Date Submitted:	Last Update:
3863		minor	always	01-28-10 09:19	02-10-10 17:12

Reporter:	ferg	Platform:
Assigned To:	ferg	OS:
Priority:	normal	OS Version:
Status:	closed	Product Version:	4.0.2
Product Build:		Resolution:	fixed
Projection:	none
ETA:	none	Fixed in Version:	4.0.4

Summary:	0003863: @Singleton injection
Description:	(rep by Wesley Wu) When a @ApplicationScoped/@Singleton bean is designed to be initialized after webapp starts (I.E. when first http request was fired) instead of being initialized during startup stage, in given circumstance, it won't be injected correctly. This is my test case: ========== StartBean =========== public class StartBean { @Inject FirstBean firstBean; } ========== FirstBean =========== public class FirstBean { @Inject SecondBean secondBean; } ========== SecondBean =========== public class SecondBean { @Inject ThirdBean thirdBean; @Inject FourthBean fourthBean; } ========== ThirdBean =========== public class ThirdBean { @Inject SingletonBean singletonBean; } ========== FourthBean =========== public class FourthBean { @Inject SingletonBean dao; } ========== SingletonBean =========== @Singleton //@Startup public class SingletonBean { } ========== MyServlet =========== public class MyServlet extends HttpServlet { @Inject StartBean startBean; protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { System.out.println("hello"); } } ========= web.xml =========== <?xml version="1.0" encoding="UTF-8"?> <web-app xmlns="http://java.sun.com/xml/ns/javaee" [^] xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" [^] xsi:schemaLocation="http://java.sun.com/xml/ns/javaee [^] http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" [^] version="2.5"> <servlet id="MyServlet"> <servlet-name>MyServlet</servlet-name> <servlet-class>com.mycompany.servlet.MyServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>MyServlet</servlet-name> <url-pattern>/MyServlet</url-pattern> </servlet-mapping> </web-app> ================================= The "http://localhost:8080/MyServlet" [^] request will produce this exception: com.mycompany.servlet.MyServlet.startBean: com.mycompany.beans.StartBean.firstBean: com.mycompany.beans.FirstBean.secondBean: com.mycompany.beans.SecondBean.fourthBean: com.mycompany.beans.FourthBean.singletonBean: java.lang.IllegalArgumentException: Can not set com.mycompany.beans.SingletonBean field com.mycompany.beans.FourthBean.singletonBean to com.mycompany.beans.FourthBean When I annotate the SingletonBean as @Startup, it's fine. (uncomment the //@Startup line in SingletonBean.java) Either @Singleton or @ApplicationScoped throws the exception. It's a weird bug, taking me nearly two days to reproduce it in such a simple test case.
Steps To Reproduce:
Additional Information:
Relationships
Attached Files: