Unable to find required classes (javax.activation.DataHandler and javax.mail.internet.MimeMultipart). Attachment support is disabled

I am facing problems in invoking a method present in a web service. The wsdl was created using AXIS.

When I try to invoke it using my java code, I am getting null values from the service response.

I am getting the warning message getting printed in my console:

Unable to find required classes (javax.activation.DataHandler and javax.mail.internet.MimeMultipart). Attachment support is disabled.

While trying to solve this, I added activation.jar and mail.jar in my workspace build path, restarted the server.

EDIT:

Right Click on the WSDL ==> Generate CLient

Then I got a proxy class, using it I wrote this to invoke the service method:

public class CallingWebService1 {

public static void main(String[] args) throws Exception {

    WebService1Proxy proxy1 = new WebService1Proxy();
    proxy1.setEndpoint("http://localhost:8045/WebService1/services/WebService1");

    EmployeeDetails details = proxy1.getDetails();
    System.out.println("Employee Id: " + details.getEmpId());
    System.out.println("Employee Name: " + details.getEmpName());
    System.out.println("Dept Id: " + details.getDeptId());
    System.out.println("Dept Name" + details.getDeptName());
    System.out.println("Age: " + details.getAge());
}

But still the problem persists :(

Further Info:

The getDetails() method is performing a DB operation fetching some records from the Oracle DB. For performing the DB operation, class12.jar is used. Does it have something to do with invoking the service method the way I am doing?