hi all i'm trying to call a web service who's wsdl is like this

part of it

<element name="compress">
   <complexType>
    <sequence>
     <element name="string" type="xsd:string"/>
    </sequence>
   </complexType>
  </element>
  <element name="compressResponse">
   <complexType>
    <sequence>
     <element name="compressReturn" type="xsd:base64Binary"/>
    </sequence>
   </complexType>
  </element>
  <element name="uncompress">
   <complexType>
    <sequence>
     <element name="bytes" type="xsd:base64Binary"/>
    </sequence>
   </complexType>
  </element>
  <element name="uncompressResponse">
   <complexType>
    <sequence>
     <element name="uncompressReturn" type="xsd:string"/>
    </sequence>
   </complexType>
  </element>

to call compress i'm doing this
String uncompressed = "some string in here";

Service service = new Service();

Call call = (Call) service.createCall();

call.setTargetEndpointAddress(endpoint);

call.setOperationName("compress");

byte[] a = ((String)call.invoke(new Object[]
{uncompressed})).getBytes();

then i'm using 'a' to pass to the next call but this hangs

Service service1 = new Service();

Call call1 = (Call) service1.createCall();

call1.setTargetEndpointAddress(endpoint);

call1.setOperationName("uncompress");

String st = (String) call1.invoke(new Object[] {a});

Can someone please help me and tell me where i'm going wrong

many thanks