DBAdapter Timestamp with Timezone

We have a Oracle database  table column which is defined as TIMESTAMP WITH TIME ZONE . I

n the SOA Composite where we have defined the DBAdapter configuration, the wizard creates following type of mapping configuration :

<attribute-mapping xsi:type="direct-mapping">

               <attribute-name>createdAt</attribute-name>

               <field table="TIMESTAMP_TEST" name="CREATED_AT" xsi:type="column"/>

               <attribute-classification>java.sql.TIMESTAMPTZ</attribute-classification>

</attribute-mapping>

but in order to preserve the Timezone we changed the configuration as following

<attribute-mapping xsi:type="direct-mapping">

               <attribute-name>createdAt</attribute-name>

               <field table="TIMESTAMP_TEST" name="CREATED_AT" xsi:type="column"/>

               <attribute-classification>oracle.sql.TIMESTAMPTZ</attribute-classification>

</attribute-mapping>

But the change gave following error. Does anybody know any solution for this?  I did find this link but we are using 12.2.1.1.0