Web Service in Sneak Preview SP15 gives NoSuchFieldError: _typeRegistry

Question

Hi,
I've been trying to create a WebDynpro application which should access a simple webservice. To ensure that the webservice actually works, I have successfully contacted it and sent a request with a successful response to it using WSNavigator.
All this is running on the Full Java Sneak Preview SP15 and being developed in NWDS SP15.
What I've done is:
- Create model using url
- Link request in context from model to component
- Link request in context from component to view
The context (of both the component and the view) is strucured as follows:
Context
- Request_UserSessionSoap_login
-- in
--- username
--- password
- Response
-- Result
The init of the component I have set up as follows:
    Request_UserSessionSoap_login login = new Request_UserSessionSoap_login();
    ComplexType_LoginRequestInDef loginRequest = new ComplexType_LoginRequestInDef();
    loginRequest.setUsername("someuser");
    loginRequest.setPassword("somepass");
    login.setIn(loginRequest);
    wdContext.nodeRequest_UserSessionSoap_login().bind(login);
I have then created a method 'login' in the component, which is called in the eventhandler to a button on the view.
The login method is as follows:
    try {
         wdContext.currentRequest_UserSessionSoap_loginElement().modelObject().execute();
         wdContext.nodeResponse().invalidate();
    } catch(Exception e) {
         wdComponentAPI.getMessageManager().reportWarning("ARGH!! " + e.getMessage());
When I try running the application and clicking the button I get the 'NoSuchFieldError: _typeRegistry' message in my tracelog.
As far as I know, my there is no errors in my approach, nor my code.
So, examining the generated code, I find where typeRegistry is set. It is in a class extends the abstract class com.sap.engine.services.webservices.jaxrpc.wsdl2java.ServiceBase. The abstract class rightly has the field 'typeRegistry'. So all is good... Just to test something I try inserting the line
private TypeMappingRegistryImpl _typeRegistry;
in the generated class, so that calls to _typeRegistry are directed at the local member.
Trying this approach (which is bound to mess everything up eventually) it seems like the code runs a little further before crashing, and I end up with the following exception in my tracelog: SAPNoClassDefFoundError: com/sap/engine/services/webservices/jaxrpc/wsdl2java/dynamic/DynamicInterface
And I've tried searching for this class but have not been able to find it anywhere. I do not think that really matters, because the first exception should never have happend in the first place.
So, all in all I am now at my wits end. I do not know what else to do than ask you people for guidance.
Thanks in advance,
developer-in-distress Rune J.

Answer 1

I have solved this now...
The solution is: Uninstall SP15, download and install SP16.
Installing SP16 might raise some new problems.. e.g. the administrator is now Administrator/abcd1234 instead of admin/admin ... And this must be manually changed in configtool.bat under secure store.. and the password for SDM should be changed from admin to abcd1234 too.... but that is another story
ps. all those things can be found around the forum.