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EJB Application Client Clarification  RSS feed

 
Ranch Hand
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Hi EJB Guru,

I would like some clarification on accessing Remote/Local Session Bean using an Application Client. In other word, there appears to be more than one approach to the same Session bean. Let's start by declaring the Converter EJB:





I have two method to accessing this bean.

( i ) Lookup JNDI using the following set of code:



( ii ) Application Client lookup?



It is the first time I come a cross method ( ii ) and could not get it to work properly. The error message

received were:

SJSAS server side

**RemoteBusinessJndiName: converter.ejb.Converter; remoteBusIntf: converter.ejb.Converter
LDR5010: All ejb(s) of [converter] loaded successfully!
Registering ad hoc servlet: WebPathPath: context root = "/converter", path = "/converter-app-client'
Java Web Start services started for application com.sun.enterprise.appclient.jws.ApplicationContentOrigin@c91c07

registration name=converter
com.sun.enterprise.appclient.jws.NestedAppclientContentOrigin@14f3900 registration name=converter, context

root=/converter/converter-app-client, module name=
, parent=converter
WEB0100: Loading web module [converter:converter-war.war] in virtual server [server] at [/converter]Class [ Lconverter/ejb/Converter; ] not found. Error while loading [ class converter.client.ConverterClient ]
Error in annotation processing: java.lang.NoClassDefFoundError: Lconverter/ejb/Converter;
deployed with moduleid = converter-app-client


Converter-app-client side

Caught an unexpected exception! java.lang.NullPointerException
at converter.client.ConverterClient.doConversion(ConverterClient.java:59)
at converter.client.ConverterClient.main(ConverterClient.java:53)

Here is the JNDI listing in ASADMIN:



My questions are:

( a ) Why does the error occur?
( b ) what is the architecture difference in accessing the same bean? Does JNDI lookup allows one to access EJB from remote host as opposed the method ( ii ) which is only restricted to local access on the same JVM/Container?
( c ) What are the pros & cons between the two?

I am using Application Client to lookup these Session Beans on Netbeans 5.5, SJSAS 9.0, SDK 1.5.0_11 on Windows XP platform.

Any guideance/advice would be very much appreciated.

Thanks alot,

Henry
 
Greenhorn
Posts: 1
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change bean class declaration to: public class ConverterBean implements Converter
it works like this
 
It is sorta covered in the JavaRanch Style Guide.
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