Unable to send/parse JSON using Worklight adapter and wink/jackson restful

Background: I am using a Worklight adapter to consume restful service. Apache wink is my restful implementation servlet. I have used jackson related jars in my service.

Problem: If I try to consume service with form-urlencoded type, it runs smoothly. However when I try to consume JSON, it fails with parse exception on the first character of JSON string sent from adapter.

Relevant implementation and exception, below.

Adapter code to consume service (runs in worklight server):

var input = {
   method : 'post',
   returnedContentType : 'json',        
   path : loginRequestPath,

   headers : { 'Content-Type': 'application/json' },
   parameters:{“commonname": username, "password" : password }
 };
return WL.Server.invokeHttp(input);

Jackson registration (copied straight from IBM). Same exception occurs even though I remove this code totally.

 public Set<Object> getSingletons() {
        Set<Object> s = new HashSet<Object>();

        // Register the Jackson provider for JSON

        // Make (de)serializer use a subset of JAXB and (afterwards) Jackson annotations
        // See http://wiki.fasterxml.com/JacksonJAXBAnnotations for more information
        ObjectMapper mapper = new ObjectMapper();

        AnnotationIntrospector primary = new JaxbAnnotationIntrospector();//new JacksonAnnotationIntrospector();
        AnnotationIntrospector secondary = new JacksonAnnotationIntrospector();
        AnnotationIntrospector pair = new AnnotationIntrospector.Pair(primary, secondary);
        mapper.getDeserializationConfig().setAnnotationIntrospector(pair);//setAnnotationIntrospector(pair);
        mapper.getSerializationConfig().setAnnotationIntrospector(pair);

        // Set up the provider
        JacksonJaxbJsonProvider jaxbProvider = new JacksonJaxbJsonProvider();
        jaxbProvider.setMapper(mapper);

        s.add(jaxbProvider);
        return s;
      }

List of jackson-related JARs in my build path:

For Apache wink, I have used:
wink, wink client, wink common and wink server jars (1.4).

The exception:

 16:39:18,143 INFO  [STDOUT] 16:39:18,142 ERROR [RequestProcessor] An unhandled exception occurred which will be propagated to the container.
org.codehaus.jackson.JsonParseException: Unexpected character ('c' (code 99)): expected a valid value (number, String, array, object, 'true', 'false' or 'null')
 at [Source: org.apache.wink.server.internal.log.Requests$LoggedServletInputStream@2ed482c6; line: 1, column: 2]
    at org.codehaus.jackson.JsonParser._constructError(JsonParser.java:1433)
    at org.codehaus.jackson.impl.JsonParserMinimalBase._reportError(JsonParserMinimalBase.java:521)
    at org.codehaus.jackson.impl.JsonParserMinimalBase._reportUnexpectedChar(JsonParserMinimalBase.java:442)
    at org.codehaus.jackson.impl.Utf8StreamParser._handleUnexpectedValue(Utf8StreamParser.java:2090)
    at org.codehaus.jackson.impl.Utf8StreamParser._nextTokenNotInObject(Utf8StreamParser.java:606)
    at org.codehaus.jackson.impl.Utf8StreamParser.nextToken(Utf8StreamParser.java:492)
    at org.codehaus.jackson.map.ObjectMapper._initForReading(ObjectMapper.java:2761)
    at org.codehaus.jackson.map.ObjectMapper._readValue(ObjectMapper.java:2682)
    at org.codehaus.jackson.map.ObjectMapper.readValue(ObjectMapper.java:1308)
    at org.codehaus.jackson.jaxrs.JacksonJsonProvider.readFrom(JacksonJsonProvider.java:398)
    at org.apache.wink.server.internal.registry.ServerInjectableFactory$EntityParam.getValue(ServerInjectableFactory.java:200)
    at org.apache.wink.common.internal.registry.InjectableFactory.instantiate(InjectableFactory.java:68)
    at org.apache.wink.server.internal.handlers.CreateInvocationParametersHandler.handleRequest(CreateInvocationParametersHandler.java:44)
    at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:26)
    at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:22)
    at org.apache.wink.server.handlers.AbstractHandlersChain.doChain(AbstractHandlersChain.java:63)
    at org.apache.wink.server.internal.handlers.FindResourceMethodHandler.handleResourceMethod(FindResourceMethodHandler.java:151)
    at org.apache.wink.server.internal.handlers.FindResourceMethodHandler.handleRequest(FindResourceMethodHandler.java:65)
    at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:26)
    at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:22)
    at org.apache.wink.server.handlers.AbstractHandlersChain.doChain(AbstractHandlersChain.java:63)
    at org.apache.wink.server.internal.handlers.FindRootResourceHandler.handleRequest(FindRootResourceHandler.java:95)
    at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:26)
    at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:22)
    at org.apache.wink.server.handlers.AbstractHandlersChain.doChain(AbstractHandlersChain.java:63)
    at org.apache.wink.server.internal.handlers.HeadMethodHandler.handleRequest(HeadMethodHandler.java:53)
    at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:26)
    at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:22)
    at org.apache.wink.server.handlers.AbstractHandlersChain.doChain(AbstractHandlersChain.java:63)
    at org.apache.wink.server.internal.handlers.OptionsMethodHandler.handleRequest(OptionsMethodHandler.java:46)
    at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:26)
    at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:22)
    at org.apache.wink.server.handlers.AbstractHandlersChain.doChain(AbstractHandlersChain.java:63)
    at org.apache.wink.server.internal.handlers.SearchResultHandler.handleRequest(SearchResultHandler.java:33)
    at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:26)
    at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:22)
    at org.apache.wink.server.handlers.AbstractHandlersChain.doChain(AbstractHandlersChain.java:63)
    at org.apache.wink.server.internal.log.ResourceInvocation.handleRequest(ResourceInvocation.java:92)
    at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:26)
    at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:22)
    at org.apache.wink.server.handlers.AbstractHandlersChain.doChain(AbstractHandlersChain.java:63)
    at org.apache.wink.server.internal.log.Requests.handleRequest(Requests.java:76)
    at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:26)
    at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:22)
    at org.apache.wink.server.handlers.AbstractHandlersChain.doChain(AbstractHandlersChain.java:63)
    at org.apache.wink.server.handlers.AbstractHandlersChain.run(AbstractHandlersChain.java:48)
    at org.apache.wink.server.internal.RequestProcessor.handleRequestWithoutFaultBarrier(RequestProcessor.java:207)
    at org.apache.wink.server.internal.RequestProcessor.handleRequest(RequestProcessor.java:154)
    at org.apache.wink.server.internal.servlet.RestServlet.service(RestServlet.java:119)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:235)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
    at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:190)
    at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:92)
    at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.process(SecurityContextEstablishmentValve.java:126)
    at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.invoke(SecurityContextEstablishmentValve.java:70)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
    at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:158)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:330)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:829)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:598)
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
    at java.lang.Thread.run(Unknown Source)

Things to consider:

In adapter code, inside parameter parameters:{“commonname": username, "password" : password } , the first character fails all the time. This time it was c , so it failed with c (code 99 is corresponding ASCII value of c).

If it'd be: parameters:{“username": username, "password" : password }, it will fail with u and the corresponding code changes to its ASCII value i.e. 117.

I also tried with single quote instead of double quote, no quote and escaping quote. Every time it fails on first character.
I also tried creating JSON explicitly and pass it as parameter like:

 var credentials = JSON.stringify({'username': username, 'password': password});

 parameters: {"credentials":credentials} //still fails in first char
 //also as parameters: {credentials} :
 //this fails in adapter itself for wrong type of parameter

What I think is:
Since it fails in parsing, I think either the way I am trying to send JSON from adapter is not a right way to do it or I have not registered Jackson properly such that it can not parse the JSON correctly. But I am totally lost where to look for this problem.

I really appreciate you all for spending time to read this long question and any helpful inputs.

Your JSON is not valid. Consider this:

{
    "commonname": "username",
    "password": "password"
}

" mark is really needed.