ClassCastException by using deployed resource adapter

Question

Dear community team,
I try to create an connection for my web application (war file) running on SAP Web Application Server to access an enterprise information system (Apache JackRabbit) by using JCA and deployed resource adapter. The resource adapter "jackrabbit-jca-1.3.3.rar " is provided Apache Jackrabbit.
http://jackrabbit.apache.org/downloads.cgi
I changed some deployment descriptor configuration and deployed it successfully by using Deployment Tools. With the Visual Administrator I also could check the JNDI object and finded an entry in connector container.
The JNDI lookup worked fine and it returned a object type "JCARepositoryHandle" (I could analyse its type and attributes in debugging modus).If I tried to cast the object "JCARepositoryHandle", I got an ClassCastException.
Do you have any adoption why I only saw the returned object "JCARepositoryHandle" in debugging modus but it wasnt possible cast and to use it.
If you need any more information, please let me know.
Thanks for your support.
PS: Please have also a look in the attached source an configuration files:
Java servlet class
===================================================================
Connection connection = null;
      Context initctx = null;
         try {
          //get the initial JNDI context
          Hashtable env = null;
          initctx = new InitialContext();
         // perform JNDI lookup to get the connection factory
         JCARepositoryHandle rep = (JCARepositoryHandle)initctx.lookup("deployedAdapters/jcr/Repository/shareable/jcr/Repository");
connector-j2ee-engine.xml
===================================================================
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE connector-j2ee-engine SYSTEM 'connector-j2ee-engine.dtd'>
<connector-j2ee-engine>
     <jndi-name>jcr/Repository</jndi-name>
     <pool-params>
          <max-connections-number>10</max-connections-number>
          <max-time-to-wait-connection>120</max-time-to-wait-connection>
          <expiration-control>
               <connection-lifetime>900</connection-lifetime>
               <run-cleanup-thread>300</run-cleanup-thread>
          </expiration-control>
     </pool-params>
</connector-j2ee-engine>
ra.xml
===================================================================
<?xml version="1.0" encoding="UTF-8"?>
    <!DOCTYPE connector PUBLIC
        '-//Sun Microsystems, Inc.//DTD Connector 1.0//EN'
        'http://java.sun.com/dtd/connector_1_0.dtd'>
    <connector>
      <display-name>Jackrabbit JCR Adapter</display-name>
      <vendor-name>Apache.org</vendor-name>
      <spec-version>1.0</spec-version>
      <eis-type>JCR Adapter</eis-type>
      <version>1.6</version>
      <license>
        <description>Not required</description>
        <license-required>false</license-required>
      </license>
      <resourceadapter>
        <managedconnectionfactory-class>org.apache.jackrabbit.jca.JCAManagedConnectionFactory</managedconnectionfactory-class>
        <connectionfactory-interface>javax.jcr.Repository</connectionfactory-interface>
        <connectionfactory-impl-class>org.apache.jackrabbit.jca.JCARepositoryHandle</connectionfactory-impl-class>
        <connection-interface>javax.jcr.Session</connection-interface>
        <connection-impl-class>org.apache.jackrabbit.jca.JCASessionHandle</connection-impl-class>
        <transaction-support>XATransaction</transaction-support>
        <config-property>
          <config-property-name>HomeDir</config-property-name>
          <config-property-type>java.lang.String</config-property-type>
          <config-property-value>C:/temp/repository</config-property-value>
        </config-property>
        <config-property>
          <config-property-name>ConfigFile</config-property-name>
          <config-property-type>java.lang.String</config-property-type>
          <config-property-value>C:/temp/repository/repository.xml</config-property-value>
        </config-property>
        <reauthentication-support>false</reauthentication-support>     
      </resourceadapter>
    </connector>

Answer 1

The reason for the ClassCastException was the class loader issue.