I had the same problem. I solved it by removing the line break from the xml file. I did
<operationBindings>
<OperationBinding>
<operationType>update</operationType>
<operationId>makePdf</operationId>
<serverObject>
<className>com.myclass</className>
<lookupStyle>new</lookupStyle>
</serverObject>
<serverMethod>makePdf</serverMethod>
</OperationBinding>
</operationBindings>
instead of ...
<serverObject>
<className>com.myclass
</className>
<lookupStyle>new</lookupStyle>
</serverObject>