How to write a plain string into a file using File Adapter

Hi All,
I am new to ESB technology. I have created one ESB application to invoke a java web service(Which will return string as result) and to write retrieved result in to a file. To achieve it i have created the file adapter using user defined schema. It was working fine. But, I got the modifications in my requirement to store the returned result(String value) in to a text file without any user defined schema. So i used native format for FileAdapter and mapped the returnedResponse(String value) to opaque:opaqueElement. But i am facing relationship error.
anybody can help me to solve this issue?.. is there any method to convert a string value to opaqueElement..
Thanks in advance..

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IdoZe,
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Hi Friends
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import javax.swing.*;
import java.util.*;
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.table.*;
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