frankie huang

I try to use it,I think it's useful sometime. It's lightweight and need not a EJB container. But I am worry about it, because no others to do this.
[ March 23, 2003: Message edited by: frankie huang ]

Got you!
Darryl ,Thank you very much!

I place this code in the web.xml

...
<servlet>
<servlet-name>servletAccount</servlet-name>
<servlet-class>test.servlet.ServletAccount</servlet-class>
</servlet>

<servlet-mapping>
<servlet-name>servletAccount</servlet-name>
<url-pattern>/servletAccount</url-pattern>
</servlet-mapping>
...

but when I deploy it to JBoss 3.0.4,It tell me

23:35:33,869 WARN [jbossweb] WARNING: ERROR@file:/C:/Documents and Settings/Adm
inistrator/Local Settings/Temp/Jetty_0_0_0_0_8080__myes/webapp/WEB-INF/web.xml l
ine:36 col:-1 : org.xml.sax.SAXParseException: component �web-app� not allow �servle
t-mapping�。
23:35:33,879 ERROR [URLDeploymentScanner] Failed to deploy: org.jboss.deployment
.scanner.URLDeploymentScanner$DeployedURL@8f7bacd1{ url=file:/D:/jboss-3.0.4/ser
ver/default/deploy/myes.war, deployedLastModified=1044718424000 }
org.jboss.deployment.DeploymentException: component�web-app� not allow �servlet�。
; - nested throwable: (org.xml.sax.SAXParseException: component�web-app� not allow
�servlet�。

I remember that I use it in Resin and it's J2EE standard. WHY? anyone could tell me?
[ February 08, 2003: Message edited by: frankie huang ]
[ February 08, 2003: Message edited by: frankie huang ]

There are 2 types of LOCK in dbms: table-locked and row-locked. maybe you should consult the db2 documentation.
I don't think these 2 transcation can run concurrently. for example:
the table "table1" like this:
--------------------------
field1 field2
'aa' 12
'bb' 20
'cc' 30
--------------------------
update1 is "update table1 set field2=22 where field1='aa'"
update3 is "update table1 set field1='dd' where field2>=20"
the result of the these 2 transaction is not sure if they run concurrently.

It seem that the implementation of the rsistent Storage is done by the phone provider.

got you,arun. Thank you very much!
[ January 14, 2003: Message edited by: frankie huang ]

Originally posted by Sam Dalton:
when you call create() you are creating a NEW instance of your stateful bean (with default values for the fields) you need to, instead, store the reference to your Stateful bean and reuse that (the HttpSession is a good place to store such a reference)
Cheers
Sam

oh,I must keep it in Session manually? I see,Thank you!

sorry,the url can't open!

Though I remove the "remove" code,the result is not changed and the member's state can't keep. And I found the bean call "setSessionContext()" & "ejbCreate()" & "count()" every time I call it in the client. the STDOUT:
10:28:37,827 INFO [STDOUT] HelloBean.setSessionContext() 10:28:37,827 INFO [STDOUT] HelloBean.ejbCreate() 10:28:37,837 INFO [STDOUT] HelloBean.count()

when I deploy a stateful session bean, the state can't keep; while a deploy a stateless session bean,the state keep. why?
my session bean:
public class HelloBean implements SessionBean { private SessionContext mContext; private int val; /** * @ejb:interface-method view-type="remote" **/ public int count() throws RemoteException{ return ++val; } /** * Create the Session Bean * * @throws CreateException * * @ejb:create-method view-type="remote" **/ public void ejbCreate() throws CreateException { }
the ejb-jar.xml
<session > <description><![CDATA[Session Bean Template ATTENTION: Some of the XDoclet tags are hidden from XDoclet by adding a "--" between @ and the namespace.]]></description> <display-name>Hello Bean</display-name> <ejb-name>myes/Hello</ejb-name> <home>com.funyear.interfaces.HelloHome</home> <remote>com.funyear.interfaces.Hello</remote> <ejb-class>com.funyear.myes.HelloBean</ejb-class> <session-type>Stateless</session-type> <transaction-type>Container</transaction-type> </session>
the client code:
try { Context lContext = new InitialContext(); HelloHome hHome = (HelloHome)lContext.lookup("java:comp/env/ejb/webmyes/Hello"); Hello hello = hHome.create(); out.println("<br>"+hello.count()); hello.remove(); }catch( Exception e ) { e.printStackTrace(); }
when I code "stateful" in the ejb-jar.xml, I found the result is always "1" even I refresh the browser times. when I code "stateless" in the ejb-jar.xml, I found the result is "1",and then "2" and then "3"...
I feel puzzling, it does not obey the book "Mastering EJB".

when I deploy a stateful session bean, the state can't keep; while a deploy a stateless session bean,the state keep. why?
my session bean:
public class HelloBean implements SessionBean { private SessionContext mContext; private int val; /** * @ejb:interface-method view-type="remote" **/ public int count() throws RemoteException{ return ++val; } /** * Create the Session Bean * * @throws CreateException * * @ejb:create-method view-type="remote" **/ public void ejbCreate() throws CreateException { }
the ejb-jar.xml
<session > <description><![CDATA[Session Bean Template ATTENTION: Some of the XDoclet tags are hidden from XDoclet by adding a "--" between @ and the namespace.]]></description> <display-name>Hello Bean</display-name> <ejb-name>myes/Hello</ejb-name> <home>com.funyear.interfaces.HelloHome</home> <remote>com.funyear.interfaces.Hello</remote> <ejb-class>com.funyear.myes.HelloBean</ejb-class> <session-type>Stateless</session-type> <transaction-type>Container</transaction-type> </session>
the client code:
try { Context lContext = new InitialContext(); HelloHome hHome = (HelloHome)lContext.lookup("java:comp/env/ejb/webmyes/Hello"); Hello hello = hHome.create(); out.println("<br>"+hello.count()); hello.remove(); }catch( Exception e ) { e.printStackTrace(); }
when I code "stateful" in the ejb-jar.xml, I found the result is always "1" even I refresh the browser times. when I code "stateless" in the ejb-jar.xml, I found the result is "1",and then "2" and then "3"...
I feel puzzling, it does not obey the book "Mastering EJB".

in English,pls!

Thank you very much! got you.

Thank you very much! I got it.
and I found the template project in the jboss is a very good start point for beginer.

Originally posted by meka toka:
Hi,
You are getting the NameNotFoundException because you are trying to lookup an object(Hello) in the location (comp/env/ejb/myestest) and your ejb object is not present over there.
Where to look for ::
1. Check and make sure that you are using the same JNDI name that you binded your object with.
go through the following links
a. http://www.jboss.org/online-manual/HTML/ch01s15.html
b. http://www.jboss.org/online-manual/HTML/ch05.html
let me know if you have any more questions
Regards
Meka Toka

I got a NameNotFoundException in my EJB's client. "javax.naming.NameNotFoundException: myes not bound" ( "myes" is the name of my war).
I depoly a .jar file(EJBs) and a .war file.
The .war contains:
[index.jsp]
-------------------------------------------------
try {
//Properties props = System.getProperties();
//Context ctx = new InitialContext(props);
Context ctx = new InitialContext();
HelloHome lHome = (HelloHome) ctx.lookup("java:comp/env/ejb/myestest/Hello");
Hello hello = lHome.create();
out.println("return:"+hello.hello());
}catch( Exception e ) {
out.println( "Caugth exception: " + e.getMessage() );
e.printStackTrace();
}
-------------------------------------------------
[WEB-INF/web.xml]
-------------------------------------------------
<ejb-ref>
<ejb-ref-name>ejb/myestest/Hello</ejb-ref-name>
<ejb-ref-type>Session</ejb-ref-type>
<home>com.funyear.myes.test.HelloHome</home>
<remote>com.funyear.myes.test.Hello</remote>
</ejb-ref>
-------------------------------------------------
[WEB-INF/jboss-web.xml]
-------------------------------------------------
<ejb-ref>
<ejb-ref-name>ejb/myestest/Hello</ejb-ref-name>
<jndi-name>ejb/myes/Hello</jndi-name>
</ejb-ref>
-------------------------------------------------
The .jar file contains:
[ejb-jar.xml]
-------------------------------------------------
<session >
<description><![CDATA[stateless session bean]]></description>
<ejb-name>com.funyear.myes.test.Hello</ejb-name>
<home>com.funyear.myes.test.HelloHome</home>
<remote>com.funyear.myes.test.Hello</remote>
<ejb-class>com.funyear.myes.test.HelloBean</ejb-class>
<session-type>Stateless</session-type>
<transaction-type>Container</transaction-type>
</session>
-------------------------------------------------
[jboss.xml]
-------------------------------------------------
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE jboss PUBLIC "-//JBoss//DTD JBOSS//EN" "http://www.jboss.org/j2ee/dtd/jboss.dtd">
<jboss>
<enterprise-beans>
<session>
<ejb-name>com.funyear.myes.test.Hello</ejb-name>
<jndi-name>com/funyear/myes/test/Hello</jndi-name>
</session>
</enterprise-beans>
<resource-managers>
</resource-managers>
</jboss>
-----------------------------------------------
and beans.
Is there anyone know why? could you tell me? thank you very much!