NameAlreadyBound exception when using InitialContext lookup

[Himai Minh]

I used Frits' example on p.66.
I have :

   echoear.ear
         - echoejb.jar
                - SecondBean.java 
                 -FirstBean.java
    otherear.ear
          -otherweb.war
               -OtherServlet.java

   @Stateless 
    public class SecondBean implements SecondBI {
	 
      @EJB (beanName ="TheFirstBean")
      FirstBI first;
       public void secondMethod(){
		  System.out.println("Within Second Bean, injected i to the First Bean "+ first.getInit());
		 System.out.println("Within Second Bean, get i in First Bean by look up "+ first.getIbyLookup());
		 
}

@Stateless (name ="TheFirstBean")
public class FirstBean implements FirstBI{
	 
	private Integer i;
	@Resource SessionContext context;
       public Integer getInit(){
             return i;
       }
   
       public Integer getIbyLookup(){
	  Integer x = (Integer) context.lookup("com.ivan.scbcd6.FirstBean/i");
	  return x;
   }
}

The ejb-jar.xml in echoejb.jar

....
//Inject a value of 300 to the integer i to FirstBean
<enterprise-beans>
      <session>
            <ejb-name>TheFirstBean</ejb-name>
            <ejb-class>com.ivan.scbcd6.FirstBean</ejb-class>
             <session-type>Stateless</session-type>
            <env-entry>
                 <env-entry-name>com.ivan.scbcd6.FirstBean/i</env-entry-name>
                 <env-entry-type>java.lang.Integer</env-entry-type>
                 <env-entry-value>300</env-entry-value>
                 <injection-target>
                    <injection-target-class>com.ivan.scbcd6.FirstBean</injection-target-class>
                    <injection-target-name>i</injection-target-name>
                 </injection-target>
            </env-entry>
      </session>
  </enterprise-beans>

@WebServlet(name="OtherServlet", urlPatterns="/test.do")
public class OtherServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
	@EJB(lookup="java:global/echoear/echoejb/SecondBean")
	SecondBI bean;
	@EJB (lookup="java:global/echoear/echoejb/TheFirstBean")
	FirstBI fbean;
	@Override
	protected void doGet(HttpServletRequest inRequest,HttpServletResponse inResponse) throws ServletException, IOException{
		   bean.secondMethod();
		   System.out.println(" Within OtherServlet, look up the first bean's i is  : "+ fbean.getIbyLookup());
		   try{
		        InitialContext context = new InitialContext();
		        Integer myX =  (Integer)context.lookup("java:global/echoear/echoejb/TheFirstBean/com.ivan.scbcd6.FirstBean/i");
		        System.out.println ("With OtherServlet, look up i injected in FirstBean using initial context : "+ myX);
		        
		   }
		   catch (NamingException e){
			   e.printStackTrace();
		   }
		    
	}

}

InitialContext cannot lookup the environment entry at java:global/echoear/echoejb/TheFirstBean/com.ivan.scbcd6.FirstBean/i

Within Second Bean, injected i to the First Bean 300
Info: Within Second Bean, get i in First Bean by look up 300
Info: Within OtherServlet, look up the first bean's i is : 300

Severe: javax.naming.NamingException: Lookup failed for 'java:global/echoear/echoejb/TheFirstBean/com.ivan.scbcd6.FirstBean/i' in SerialContext[myEnv={java.naming.factory.initial=com.sun.enterprise.naming.impl.SerialInitContextFactory, java.naming.factory.state=com.sun.corba.ee.impl.presentation.rmi.JNDIStateFactoryImpl, java.naming.factory.url.pkgs=com.sun.enterprise.naming} [Root exception is javax.naming.NameAlreadyBoundException: TheFirstBean]
....
Caused by: javax.naming.NameAlreadyBoundException: TheFirstBean

[Frits Walraven]

The integer i is only known in the context of TheFirstBean. A lookup from outside the EJB is not possible.

[Ivan Pyshko]

With all the respect , possibly, this is not correct or container dependent, I dunno.
The <env-entry-name> element is relative to the "java:comp/env" JNDI tree node ,
this is why the Integer i is not only known in the bean contexts but outside bean as well.

The code below show all env variable lookup names

InitialContext ctx = new InitialContext();
            NamingEnumeration<NameClassPair> list = ctx.list("java:comp/env");
            while (list.hasMore()) {
                sout(out, list.next().getName());
            }

In servlet instead of using
(Integer)context.lookup("java:global/echoear/echoejb/TheFirstBean/com.ivan.scbcd6.FirstBean/i");
has to be something like JNDI tree "java:comp/env"
Integer passphrase = (Integer) jndiContext.lookup("java:comp/env/com.ivan.scbcd6.FirstBean/i");

you could even do in servlet something like this.

 @Resource(lookup= "java:comp/env/com.ivan.scbcd6.FirstBean/i"")
    private Integer integer;

[Himai Minh]

Hi, Ivan Ka. Thanks for your suggestion.
I think your solution work only when the servlet is in the same .jar file as the beans.

@Resource(lookup= "java:comp/env/com.ivan.scbcd6.FirstBean/i"")
private Integer integer;

I remember the fact that all components in the same .jar share the same JNDI naming environment java:comp/env .

I will try it out later.

[Himai Minh]

Hi, Ivan Ka,
I tried this:
1. In echoejb.jar file, there is a FirstBean, FirstBI ..... And there is a otherweb.war to access the bean in echoejb.
See the attached file structure.

2. Deployment descriptor for FirstBean to inject the integer i:

<ejb-jar version="3.1" 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/ejb-jar_3_1.xsd">
<display-name>echoejb </display-name>
<enterprise-beans>
<session>
<ejb-name>TheFirstBean</ejb-name>
<ejb-class>com.ivan.scbcd6.FirstBean</ejb-class>
<session-type>Stateless</session-type>
<env-entry>
<env-entry-name>com.ivan.scbcd6.FirstBean/i</env-entry-name>
<env-entry-type>java.lang.Integer</env-entry-type>
<env-entry-value>1300</env-entry-value>
<injection-target>
<injection-target-class>com.ivan.scbcd6.FirstBean</injection-target-class>
<injection-target-name>i</injection-target-name>
</injection-target>
</env-entry>
</session>
.....

3. FirstBean.java:

@Stateless (name ="TheFirstBean")
@Remote(FirstBI.class)
@LocalBean 
public class FirstBean implements FirstBI{
	
	private Integer i; 
 ......

4. SecondBean.java

@Stateless 
@EJB (name = "ejb/echoBean", beanInterface=FirstBI.class, beanName="TheFirstBean")
 
public class SecondBean implements SecondBI {
     .....
     @Resource (lookup="java:module/TheFirstBean!com.ivan.scbcd6.FirstBI/i")
//or I even tried this @Resource (lookup="java:comp/env/[e-mail]/i")
     private Integer secondMyInt;
	 .....

5. I got this when I access the servlet:
Caused by: javax.naming.NamingException: Lookup failed for 'java:comp/env/com.ivan.scbcd6.SecondBean/secondMyInt'
....
Caused by: javax.naming.NamingException: Lookup failed for 'java:module/TheFirstBean!com.ivan.scbcd6.FirstBI/i'
...
Caused by: javax.naming.NameNotFoundException: No object bound to name java:module/TheFirstBean!com.ivan.scbcd6.FirstBI/i
....

It won't work if I try the lookup="java:comp/env/....

Like Frit said, the integer i in FirstBean is only accessible within the FirstBean, not outside it.

[Himai Minh]

I tried Ivan Ka's code to print out the naming enumeration;

 try{
		     InitialContext context = new InitialContext();
		     NamingEnumeration<NameClassPair> envVariables = context.list("java:comp/env");
		     while (envVariables.hasMore()){
		    	 System.out.println(envVariables.next().getName());
		     }
		  }
		  catch (NamingException e){
			   e.printStackTrace();
		  }

For my FirstBean, the naming enumeration is only this :java:comp/env/com.ivan.scbcd6.FirstBean. The i is not in the enumeration even though my deployment descriptor says this :

<session>
<ejb-name>TheFirstBean</ejb-name>
<ejb-class>com.ivan.scbcd6.FirstBean</ejb-class>
<session-type>Stateless</session-type>
<env-entry>
<env-entry-name>com.ivan.scbcd6.FirstBean/i</env-entry-name>
<env-entry-type>java.lang.Integer</env-entry-type>
<env-entry-value>1300</env-entry-value>
<injection-target>
<injection-target-class>com.ivan.scbcd6.FirstBean</injection-target-class>
<injection-target-name>i</injection-target-name>
</injection-target>
</env-entry>

</session>

My SecondBean has this enumerations:

java:comp/env/com.ivan.scbcd6.SecondBean
java:comp/env/ejb1

My SecondBean has declared an environment entry:

@EJB (name = "ejb1/echoBean", beanInterface=FirstBI.class, beanName="TheFirstBean")
public class SecondBean implements SecondBI {
 ....
}

[Himai Minh]

I tried to do another experiment. I created a .war file with the FirstBean, SecondBean and the servlet that access the beans.
(See the attached file structure.)

@Stateless (name ="TheFirstBean")
@Remote(FirstBI.class)
@LocalBean 
public class FirstBean implements FirstBI{
	
	private Integer i;
....

<ejb-jar version="3.1" 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/ejb-jar_3_1.xsd">
<display-name>echoejb</display-name>
<enterprise-beans>
<session>
<ejb-name>TheFirstBean</ejb-name>
<ejb-class>com.ivan.scbcd6.FirstBean</ejb-class>
<session-type>Stateless</session-type>
<env-entry>
<env-entry-name>com.ivan.scbcd6.FirstBean/i</env-entry-name>
<env-entry-type>java.lang.Integer</env-entry-type>
<env-entry-value>1500</env-entry-value>
<injection-target>
<injection-target-class>com.ivan.scbcd6.FirstBean</injection-target-class>
<injection-target-name>i</injection-target-name>
</injection-target>
</env-entry>

</session>
<session>
<ejb-name>SecondBean</ejb-name>
<ejb-class>com.ivan.scbcd6.SecondBean</ejb-class>
<session-type>Stateless</session-type>
<ejb-ref>
<ejb-ref-name>com.ivan.scbcd6.SecondBean/fbi</ejb-ref-name>
<lookup-name>java:module/TheFirstBean!com.ivan.scbcd6.FirstBI</lookup-name>
</ejb-ref>
<resource-env-ref>
<resource-env-ref-name>java:comp/EJBContext</resource-env-ref-name>
<resource-env-ref-type>javax.ejb.EJBContext</resource-env-ref-type>
<injection-target>
<injection-target-class>com.ivan.scbcd6.SecondBean</injection-target-class>
<injection-target-name>mDDInjectedEjbContext</injection-target-name>
</injection-target>
</resource-env-ref>
</session>
</enterprise-beans>
</ejb-jar>

@WebServlet(name="OtherServlet", urlPatterns="/test.do")
public class OtherServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
	@EJB(lookup="java:module/SecondBean")
	SecondBI bean;
	@EJB (lookup="java:module/TheFirstBean!com.ivan.scbcd6.FirstBI")
	FirstBI fbean;
	@Override
	protected void doGet(HttpServletRequest inRequest,
			HttpServletResponse inResponse) throws ServletException, IOException{
		   ...
		   lookupInt();
	}
	 private void lookupInt(){
    	 try{
    		 InitialContext context = new InitialContext();
                //lookup the i in FirstBean
    		 Integer myInteger =   (Integer)context.lookup("java:comp/env/com.ivan.scbcd6.FirstBean/i");
    		 System.out.println("Look up the integer ..... "+ myInteger);
    	 }
    	 catch(NamingException e){
    		 e.printStackTrace();
    	 }
     }
}

The servlet can lookup the integer i in FirstBean because in .war file, all the components share the same JNDI environment.
But if the beans are in a .jar file, the servlet in another .war file cannot access the variables in the .jar file.

[Frits Walraven]

Nice , well done, and thanks for sharing, have a Cow!