public class UserDetails implements Serializable{
    private String userName;
    private Integer userID;
    private String userPassword;
    private String ipAddress;
    private int userType;

    ...
}

public class TestStructureBean implements Serializable{
    String domain;
    int caseNumber;
    Date date;
    TestObject testObject;
    public TestStructureBean() {
    testObject = new TestObject();
    date = new Date();
    caseNumber=0;
    domain = "constructor";
    }

    ...

}