ClassCastException when retrieving SOAP content

I got a java.lang.ClassCastException: com.sun.xml.messaging.saaj.soap.dom4j.TextImpl
when retrieving SOAP content.
The code looks like:
SOAPPart part = message.getSOAPPart();
SOAPEnvelope envelope = part.getEnvelope();
SOAPBody body = envelope.getBody();
SOAPBodyElement bookElement = ( SOAPBodyElement ) body.getChildElements().next();
SOAPElement isbnElement = ( SOAPElement ) bookElement.getChildElements().next();
System.out.println( isbnElement.getValue() );
The SOAP message as follows:
<?xml version="1.0" encoding="UTF-8"?>
<soapenv:Envelope soapenv:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/" xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/">
<soapenv:Body>
<ns1:getPrice xmlns:ns1="http://www.deitel.com/BookPrie.wsdl">
<arg0 xsi:type="xsd:string">0130895601</arg0>
</ns1:getPrice>
</soapenv:Body>
</soapenv:Envelope>
Any help?
Thanks in advance.

I had a similar problem and solved it. Please look at http://forum.java.sun.com/thread.jsp?forum=331&thread=268806 .

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