EJB lookup via JNDI results in java.lang.NoClassDefFoundError

Question

Hello,
I have created and deployed an EJB to the WebAS (ver 6.40).  There is no problem looking up the bean via JNDI and calling its methods from a J2EE application - I successfully did this via a servlet.
However, a JNDI lookup from a Web Dynpro application - on the same server - results in a java.lang.NoClassDefFoundError error.
The code for the JNDI lookup is identical in either case.
Any thoughts?

Answer 1

Hello,
I am calling ejb from .jsp use following code
Properties props = new Properties();
InitialContext ctx = new InitialContext();
Object ob = ctx.lookup("java:comp/env/ejb/CalculatorBean");
CalculatorHome home = (CalculatorHome) PortableRemoteObject.narrow(ob, CalculatorHome.class);
calc = home.create();
I have a error:
java.lang.ClassNotFoundException: class com.sap.examples.calculator.beans.CalcProxy : com.sap.engine.services.jndi.persistent.exceptions.NameNotFoundException: Path to object does not exist at calculator, the whole lookup name is java:comp/env/ejb/CalculatorBean
My ejb-jar.xml is:
<display-name>
     CalculatorEjb</display-name>
     <enterprise-beans>
          <session>
               <icon/>
               <ejb-name>Calculator</ejb-name>
               <home>com.sap.examples.calculator.CalculatorHome</home>
               <remote>com.sap.examples.calculator.CalculatorRemote</remote>
               <local-home>com.sap.examples.calculator.CalculatorLocalHome</local-home>
               <local>com.sap.examples.calculator.CalculatorLocal</local>
               <service-endpoint>com.sap.examples.calculator.CalculatorServiceEndpoint</service-endpoint>
               <ejb-class>com.sap.examples.calculator.CalculatorBean</ejb-class>
               <session-type>Stateless</session-type>
               <transaction-type>Container</transaction-type>
               <ejb-ref>
                    <ejb-ref-name>ejb/CalculatorBean</ejb-ref-name>
                    <ejb-ref-type>Session</ejb-ref-type>
                    <home>com.sap.examples.calculator.CalculatorHome</home>
                    <remote>com.sap.examples.calculator.CalculatorRemote</remote>
                    <ejb-link>Calculator</ejb-link>
               </ejb-ref>
               <ejb-local-ref>
                    <description/>
                    <ejb-ref-name>ejb/CalculatorBean</ejb-ref-name>
                    <ejb-ref-type>Session</ejb-ref-type>
                    <local-home>com.sap.examples.calculator.CalculatorLocalHome</local-home>
                    <local>com.sap.examples.calculator.CalculatorLocal</local>
                    <ejb-link>Calculator</ejb-link>
               </ejb-local-ref>
          </session>
     </enterprise-beans>
my ejb-j2ee-engine.xml is:
<?xml version="1.0" encoding="UTF-8"?>
<ejb-j2ee-engine
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:noNamespaceSchemaLocation="ejb-j2ee-engine.xsd">
     <enterprise-beans>
          <enterprise-bean>
               <ejb-name>Calculator</ejb-name>
               <ejb-ref>
                    <ejb-ref-name>ejb/CalculatorBean</ejb-ref-name>
                    <jndi-name>ejb/CalculatorBean</jndi-name>
               </ejb-ref>
               <ejb-local-ref>
                    <ejb-ref-name>ejb/CalculatorBean</ejb-ref-name>
                    <jndi-name>ejb/CalculatorBean</jndi-name>
               </ejb-local-ref>
          </enterprise-bean>
     </enterprise-beans>
</ejb-j2ee-engine>