ClassCastException: oracle.jdbc.driver.T4CConnection cannot be cast to oracle.jdbc.OracleConnection

When I am trying to get connection with an Oracle database, I am facing this issue. My application specs are java8 + ejb + jboss-eap-7.3 + oracle 12c

Please find my code details below

My pom.xml

    <dependency>
         <groupId>ojdbc</groupId>
         <artifactId>ojdbc</artifactId>
         <version>14</version>
         <type>ejb</type>
         <scope>provided</scope> 
    <dependency>

I have added "ojdbc6.jar" in module.xml file from the path jboss-ep-7.3/modules/com/oracle/ojdbc/main.

    My DBConnection.java
    CallableStatement statement;
    Connection connection;
    ArrayDescriptor descriptor;
    Connection conn = datasourceObj.getconnection(dev);
    try {
        statement = conn.prepareCall(callString);
        connection = ((WrappedConnection) 
      conn).getUnderlyingConnection();
        descriptor = ArrayDescriptor.createDescriptor("NUM_ARRAY", 
       connection);
    }

After deployed this EAR into jboss 7.3, I got the below error

> Caused by: java.lang.ClassCastException:
> org.jboss.jca.adapters.jdbc.jdk8.WrappedConnectionJDK8 cannot be cast
> to oracle.jdbc.OracleConnection

And I replace the below code

connection = ((WrappedConnection) conn).getUnderlyingConnection();

with this piece of code

OracleConnection oracleConnection = (OracleConnection) conn.getClass().getMethod("getUnderlyingConnection").invoke(conn);

After this code change am getting

> ClassCastException: oracle.jdbc.driver.T4CConnection cannot be cast to
> oracle.jdbc.OracleConnection

I checked even removing the classes12.jar but no progress on that. The same I need to do for oracle19c. Please give your valuable comments to sort out this.