Did u get it work? I am having the same problem.

Thanks,
Wade

Could both of you please put together a post with useful information that is not a complete waste of everyones times.

NEVER post a line like 'javax.ejb.EJBException: Could not instantiate bean', this tells us nothing. Post the exception, message and stack trace.

Post some code examples to show what you are actually doing.

everytime i try to call either the crete or findByPrimarykey() method on my remote interface

Sorry, Darren and others. Ensuing are my classes and config files including the entity bean class and ejb-jar.xml, web.xml, jboss-web.xml
jboss.xml. BTW, I am using Jboss4.0.2/Eclipse3.1/JBossIDE1.5M/Java5.

Here is the place where the exception (at Create) gets thrown:
...
WWSoftUserLocalHome userHome = WWSoftUserUtil.getLocalHome();
WWSoftUserLocal user = userHome.create(userLoginName);
...

Any helps would be greatly appreciated.

1. The bean class

/**
* @ejb.bean name="WWSoftUser"
* display-name="User Entity Bean"
* description="It represents a user to the system."
* type="CMP"
* cmp-version="2.x"
* view-type="local"
* primkey-field="id"
*
* @ejb.finder signature="java.util.Collection findAll()"
* query="SELECT OBJECT(u) FROM WWSoftUser AS u"
*
* @ejb.finder signature="java.util.Collection findUser(java.lang.String id)"
* query="SELECT OBJECT(u) FROM WWSoftUser AS u WHERE u.id = ?1"
*
* @ejb.value-object name="WWSoftUser"
*/
public abstract class WWSoftUserBean implements EntityBean {

public WWSoftUserBean() {
super();
// TODO Auto-generated constructor stub
}

/** @ejb.create-method */
public String ejbCreate(String userLoginName)
throws CreateException
{
logger.debug("WWSoftUserBean:ejbCreate *****");
setId(com.wwsoft.strutswithejb.interfaces.WWSoftUserUtil.generateGUID(this));
setName(userLoginName);
setCreatedDate(new Date());
logger.debug("creating user identified by " +
getId() + " and " + userLoginName);
return null;
}

public void ejbPostCreate(String userLoginName)
throws CreateException
{

}

/**
* @ejb.pk-field
* @ejb.persistence
* @ejb.interface-method
*/
public abstract String getId();
public abstract void setId(String id);

/**
* @ejb.persistence
* @ejb.interface-method
*/
public abstract String getName();
/** @ejb.interface-method */
public abstract void setName(String name);

/**
* @ejb.persistence
* @ejb.interface-method
*/
public abstract Date getCreatedDate();
/** @ejb.interface-method */
public abstract void setCreatedDate(Date date);

/**
* @ejb.interface-method
*
* @ejb.relation name="Parent-to-Child"
* role-name="Parent-has-one-Child"
* target-ejb="com.wwsoft.strutswithejb.ejb.AddressBean"
* target-role-name="Child-has-one-parent"
*
*/
public abstract com.wwsoft.strutswithejb.interfaces.AddressLocal getAddress();

/** @ejb.interface-method */
public abstract void setAddress(com.wwsoft.strutswithejb.interfaces.AddressLocal address);

private Logger logger = Logger.getLogger(WWSoftUserBean.class);
}


2. My ejb-jar.xml

<?xml version="1.0" encoding="UTF-8"?>

<ejb-jar xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/ejb-jar_2_1.xsd" version="2.1">

<![CDATA[No Description.]]>
<display-name>Generated by XDoclet</display-name>

<enterprise-beans>

<!-- Session Beans -->

<![CDATA[Description for HotelManagerSession]]>
<display-name>Name for HotelManagerSession</display-name>

<ejb-name>HotelManagerSession</ejb-name>

com.wwsoft.strutswithejb.interfaces.HotelManagerSessionHome
com.wwsoft.strutswithejb.interfaces.HotelManagerSession
<ejb-class>com.wwsoft.strutswithejb.ejb.HotelManagerSessionBean</ejb-class>
<session-type>Stateless</session-type>
<transaction-type>Container</transaction-type>



<!--
To add session beans that you have deployment descriptor info for, add
a file to your XDoclet merge directory called session-beans.xml that contains
the markup for those beans.
-->

<!-- Entity Beans -->

<![CDATA[It represents a user to the system.]]>
<display-name>User Entity Bean</display-name>

<ejb-name>WWSoftUser</ejb-name>

<local-home>com.wwsoft.strutswithejb.interfaces.WWSoftUserLocalHome</local-home>
com.wwsoft.strutswithejb.interfaces.WWSoftUserLocal

<ejb-class>com.wwsoft.strutswithejb.ejb.WWSoftUserBean</ejb-class>
<persistence-type>Container</persistence-type>
<prim-key-class>java.lang.String</prim-key-class>
false
<cmp-version>2.x</cmp-version>
<abstract-schema-name>WWSoftUser</abstract-schema-name>
<cmp-field >
<![CDATA[]]>
<field-name>id</field-name>
</cmp-field>
<cmp-field >
<![CDATA[]]>
<field-name>name</field-name>
</cmp-field>
<cmp-field >
<![CDATA[]]>
<field-name>createdDate</field-name>
</cmp-field>
<primkey-field>id</primkey-field>


<query-method>
<method-name>findAll</method-name>
<method-params>
</method-params>
</query-method>
<ejb-ql><![CDATA[SELECT OBJECT(u) FROM WWSoftUser AS u]]></ejb-ql>


<query-method>
<method-name>findUser</method-name>
<method-params>
<method-param>java.lang.String</method-param>
</method-params>
</query-method>
<ejb-ql><![CDATA[SELECT OBJECT(u) FROM WWSoftUser AS u WHERE u.id = ?1]]></ejb-ql>

<!-- Write a file named ejb-finders-WWSoftUserBean.xml if you want to define extra finders. -->




<![CDATA[It represents a generic address.]]>
<display-name>generic address</display-name>

<ejb-name>Address</ejb-name>

<local-home>com.wwsoft.strutswithejb.interfaces.AddressLocalHome</local-home>
com.wwsoft.strutswithejb.interfaces.AddressLocal

<ejb-class>com.wwsoft.strutswithejb.ejb.AddressBean</ejb-class>
<persistence-type>Container</persistence-type>
<prim-key-class>java.lang.String</prim-key-class>
false
<cmp-version>2.x</cmp-version>
<abstract-schema-name>Address</abstract-schema-name>
<cmp-field >
<![CDATA[]]>
<field-name>id</field-name>
</cmp-field>
<cmp-field >
<![CDATA[]]>
<field-name>addressLine1</field-name>
</cmp-field>
<cmp-field >
<![CDATA[]]>
<field-name>addressLine2</field-name>
</cmp-field>
<cmp-field >
<![CDATA[]]>
<field-name>city</field-name>
</cmp-field>
<cmp-field >
<![CDATA[]]>
<field-name>state</field-name>
</cmp-field>
<cmp-field >
<![CDATA[]]>
<field-name>zip</field-name>
</cmp-field>
<primkey-field>id</primkey-field>


<query-method>
<method-name>findAll</method-name>
<method-params>
</method-params>
</query-method>
<ejb-ql><![CDATA[SELECT OBJECT(a) FROM Address AS a]]></ejb-ql>

<!-- Write a file named ejb-finders-AddressBean.xml if you want to define extra finders. -->



<!--
To add entity beans that you have deployment descriptor info for, add
a file to your XDoclet merge directory called entity-beans.xml that contains
the markup for those beans.
-->

<!-- Message Driven Beans -->
<!--
To add message driven beans that you have deployment descriptor info for, add
a file to your XDoclet merge directory called message-driven-beans.xml that contains
the <message-driven></message-driven> markup for those beans.
-->

</enterprise-beans>

<!-- Relationships -->

<ejb-relation >
<ejb-relation-name>Parent-to-Child</ejb-relation-name>

<ejb-relationship-role >
<ejb-relationship-role-name>Parent-has-one-Child</ejb-relationship-role-name>
One
<relationship-role-source >
<ejb-name>WWSoftUser</ejb-name>
</relationship-role-source>
<cmr-field >
<cmr-field-name>address</cmr-field-name>
</cmr-field>
</ejb-relationship-role>

<ejb-relationship-role >
<ejb-relationship-role-name>Child-has-one-parent</ejb-relationship-role-name>
One
<relationship-role-source >
<ejb-name>Address</ejb-name>
</relationship-role-source>
<cmr-field >
<cmr-field-name>parent</cmr-field-name>
</cmr-field>
</ejb-relationship-role>

</ejb-relation>
<!--
To add relationships for beans not managed by XDoclet, add
a file to your XDoclet merge directory called relationships.xml that contains
the <ejb-relation></ejb-relation> markups for those beans.
-->


<!-- Assembly Descriptor -->
<!--
To specify your own assembly descriptor info here, add a file to your
XDoclet merge directory called assembly-descriptor.xml that contains
the <assembly-descriptor></assembly-descriptor> markup.
-->

<assembly-descriptor >
<!--
To specify additional security-role elements, add a file in the merge
directory called ejb-security-roles.xml that contains them.
-->

<!-- method permissions -->
<!--
To specify additional method-permission elements, add a file in the merge
directory called ejb-method-permissions.ent that contains them.
-->

<!-- transactions -->
<!--
To specify additional container-transaction elements, add a file in the merge
directory called ejb-container-transactions.ent that contains them.
-->

<!-- finder transactions -->

<!-- message destinations -->
<!--
To specify additional message-destination elements, add a file in the merge
directory called ejb-message-destinations.ent that contains them.
-->

<!-- exclude list -->
<!--
To specify an exclude-list element, add a file in the merge directory
called ejb-exclude-list.xml that contains it.
-->
</assembly-descriptor>

</ejb-jar>


3. My web.xml
<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd" version="2.4">


<!--
To use non XDoclet filters, create a filters.xml file that
contains the additional filters (eg Sitemesh) and place it in your
project's merge dir. Don't include filter-mappings in this file,
include them in a file called filter-mappings.xml and put that in
the same directory.
-->

<!--
To use non XDoclet filter-mappings, create a filter-mappings.xml file that
contains the additional filter-mappings and place it in your
project's merge dir.
-->


<servlet-name>StarterServlet</servlet-name>
A servlet for setup component container and other initialization processes
<servlet-class>com.wwsoft.strutswithejb.web.StarterServlet</servlet-class>
<init-param>
<param-name>log4jInitFile</param-name>
<param-value>WEB-INF/conf/applog4j.xml</param-value>
</init-param>
<init-param>
<param-name>appConfigFile</param-name>
<param-value>WEB-INF/conf/appConfig.properties</param-value>
</init-param>
<load-on-startup>1</load-on-startup>

<!-- Standard Action Servlet Configuration (with debugging) -->

<servlet-name>action</servlet-name>
<servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
<init-param>
<param-name>config</param-name>
<param-value>/WEB-INF/struts-config.xml</param-value>
</init-param>
<init-param>
<param-name>config/hotel</param-name>
<param-value>/WEB-INF/conf/hotel/struts-config.xml</param-value>
</init-param>
<init-param>
<param-name>debug</param-name>
<param-value>2</param-value>
</init-param>
<init-param>
<param-name>detail</param-name>
<param-value>2</param-value>
</init-param>
<load-on-startup>2</load-on-startup>


<!-- Standard Action Servlet Mapping -->
<servlet-mapping>
<servlet-name>action</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>
<!-- Struts Tag Library Descriptors -->

<taglib-uri>/tags/struts-bean</taglib-uri>
<taglib-location>/WEB-INF/struts-bean.tld</taglib-location>



<taglib-uri>/tags/struts-html</taglib-uri>
<taglib-location>/WEB-INF/struts-html.tld</taglib-location>



<taglib-uri>/tags/struts-logic</taglib-uri>
<taglib-location>/WEB-INF/struts-logic.tld</taglib-location>



<taglib-uri>/tags/struts-nested</taglib-uri>
<taglib-location>/WEB-INF/struts-nested.tld</taglib-location>


<taglib-uri>/tags/struts-tiles.tld</taglib-uri>
<taglib-location>/WEB-INF/struts-tiles.tld</taglib-location>


<!--
To specify mime mappings, create a file named mime-mappings.xml, put it in your project's mergedir.
Organize mime-mappings.xml following this DTD slice:

<!ELEMENT mime-mapping (extension, mime-type)>
-->

<!--
To specify error pages, create a file named error-pages.xml, put it in your project's mergedir.
Organize error-pages.xml following this DTD slice:

<!ELEMENT error-page ((error-code | exception-type), location)>
-->

<!--
To add taglibs by xml, create a file called taglibs.xml and place it
in your merge dir.
-->

<ejb-ref >
<ejb-ref-name>ejb/HotelManagerSession</ejb-ref-name>
<ejb-ref-type>Session</ejb-ref-type>
com.wwsoft.strutswithejb.interfaces.HotelManagerSessionHome
com.wwsoft.strutswithejb.interfaces.HotelManagerSession
<ejb-link>HotelManagerSession</ejb-link>
</ejb-ref>

<ejb-local-ref >
<ejb-ref-name>ejb/WWSoftUserLocal</ejb-ref-name>
<ejb-ref-type>Entity</ejb-ref-type>
<local-home>com.wwsoft.strutswithejb.interfaces.WWSoftUserLocalHome</local-home>
com.wwsoft.strutswithejb.interfaces.WWSoftUserLocal
<ejb-link>WWSoftUser</ejb-link>
</ejb-local-ref>

<ejb-local-ref >
<ejb-ref-name>ejb/AddressLocal</ejb-ref-name>
<ejb-ref-type>Entity</ejb-ref-type>
<local-home>com.wwsoft.strutswithejb.interfaces.AddressLocalHome</local-home>
com.wwsoft.strutswithejb.interfaces.AddressLocal
<ejb-link>Address</ejb-link>
</ejb-local-ref>

</web-app>

4. My jboss-web.xml

<jboss-web>
<ejb-ref>
<ejb-ref-name>ejb/HotelManagerSession</ejb-ref-name>
<jndi-name>ejb/HotelManagerSession</jndi-name>
</ejb-ref>

<ejb-local-ref >
<ejb-ref-name>ejb/WWSoftUserLocal</ejb-ref-name>
<jndi-name>WWSoftUserLocal</jndi-name>
</ejb-local-ref>

<ejb-local-ref >
<ejb-ref-name>ejb/AddressLocal</ejb-ref-name>
<jndi-name>AddressLocal</jndi-name>
</ejb-local-ref>
</jboss-web>

5. My jboss.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE jboss PUBLIC "-//JBoss//DTD JBOSS 3.0//EN" "http://www.jboss.org/j2ee/dtd/jboss_3_0.dtd">



<enterprise-beans>

<!--
To add beans that you have deployment descriptor info for, add
a file to your XDoclet merge directory called jboss-beans.xml that contains
the , and <message-driven></message-driven>
markup for those beans.
-->


<ejb-name>WWSoftUser</ejb-name>
<local-jndi-name>WWSoftUserLocal</local-jndi-name>



<ejb-name>Address</ejb-name>
<local-jndi-name>AddressLocal</local-jndi-name>




<ejb-name>HotelManagerSession</ejb-name>
<jndi-name>ejb/HotelManagerSession</jndi-name>



<!--
write a merge file jboss-webservices.ent for webservice-description
-->

</enterprise-beans>

<resource-managers>
</resource-managers>

<!--
| for container settings, you can merge in jboss-container.xml
| this can contain <invoker-proxy-bindings/> and <container-configurations/>
-->



6. Finally the exception stack trace:

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

javax.servlet.ServletException: Could not instantiate bean
org.apache.struts.action.RequestProcessor.processException(RequestProcessor.java:523)
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:421)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:224)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:81)


root cause

javax.ejb.EJBException: Could not instantiate bean
org.jboss.ejb.plugins.AbstractInstancePool.get(AbstractInstancePool.java:180)
org.jboss.ejb.plugins.EntityInstanceInterceptor.invokeHome(EntityInstanceInterceptor.java:96)
org.jboss.ejb.plugins.EntityLockInterceptor.invokeHome(EntityLockInterceptor.java:61)
org.jboss.ejb.plugins.EntityCreationInterceptor.invokeHome(EntityCreationInterceptor.java:28)
org.jboss.ejb.plugins.CallValidationInterceptor.invokeHome(CallValidationInterceptor.java:41)
org.jboss.ejb.plugins.AbstractTxInterceptor.invokeNext(AbstractTxInterceptor.java:109)
org.jboss.ejb.plugins.TxInterceptorCMT.runWithTransactions(TxInterceptorCMT.java:335)
org.jboss.ejb.plugins.TxInterceptorCMT.invokeHome(TxInterceptorCMT.java:146)
org.jboss.ejb.plugins.SecurityInterceptor.invokeHome(SecurityInterceptor.java:116)
org.jboss.ejb.plugins.LogInterceptor.invokeHome(LogInterceptor.java:121)
org.jboss.ejb.plugins.ProxyFactoryFinderInterceptor.invokeHome(ProxyFactoryFinderInterceptor.java:93)
org.jboss.ejb.EntityContainer.internalInvokeHome(EntityContainer.java:508)
org.jboss.ejb.Container.invoke(Container.java:894)
org.jboss.ejb.plugins.local.BaseLocalProxyFactory.invokeHome(BaseLocalProxyFactory.java:342)
org.jboss.ejb.plugins.local.LocalHomeProxy.invoke(LocalHomeProxy.java:118)
$Proxy62.create(Unknown Source)
com.wwsoft.strutswithejb.business.BusinessDelegate.createUser(BusinessDelegate.java:58)
com.wwsoft.strutswithejb.web.UserCreationAction.execute(UserCreationAction.java:26)
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:419)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:224)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:81)


note The full stack trace of the root cause is available in the Apache Tomcat/5.5.9 logs.

Hi all,

I am also getting the same problem each time i am calling home.create() method on my stateless session bean.

Log suggests nothing.

Please tell the solution if any of you have solved it.

Thanks
Chetan

"achetan" wrote:
Hi all,

I am also getting the same problem each time i am calling home.create() method on my stateless session bean.

Log suggests nothing.

Please tell the solution if any of you have solved it.

Thanks
Chetan