Dear Praveen,
Thanks for you response.
I have selected the option Read Attachment in Operation Mapping.
I don't have experience in JAVA programs. I copied the method of the JAVA public static byte[] hexStringToByteArray(String s) into my UDF and this UDF I will place in between the Sender and Receiver BLOB field.
I have selected Execution Type as Single Value while creating the UDF.
While executing I am receiving the following error which you can observe in the screenshot.
Please correct me.
Regards..