Using SalesForce.com REST API

I was trying to use salesforce.com REST API for getting data. So i started following the http://wiki.developerforce.com/page/Integrating_Java_Spring_Apps_on_Heroku_with_Force.com_REST_APIs document. But after i followed it i kept getting Unable to get access token exception, more details here

 at com.force.sdk.oauth.connector.ForceOAuthConnector.createTokenInternal(ForceOAuthConnector.java:196)
2013-11-28T05:58:29.294965+00:00 app[web.1]:  at org.springframework.security.authentication.AbstractAuthenticationManager.authenticate(AbstractAuthenticationManager.java:48)
2013-11-28T05:58:29.294965+00:00 app[web.1]: 05:58:29,267 ERROR OAuthAuthenticationProvider:82 - Unable to get access token
2013-11-28T05:58:29.294965+00:00 app[web.1]: java.io.IOException: Missing refresh token on response
2013-11-28T05:58:29.294965+00:00 app[web.1]:  at org.springframework.security.authentication.ProviderManager.doAuthentication(ProviderManager.java:130)
2013-11-28T05:58:29.294965+00:00 app[web.1]:  at com.force.sdk.springsecurity.OAuthAuthenticationProvider.authenticate(OAuthAuthenticationProvider.java:78)
2013-11-28T05:58:29.300136+00:00 heroku[router]: at=info method=GET path=/_auth?code=aPrxkpHJh6tvoT6FsBbmu3.hEs0MRNTo0tj3P9AWu2oQ3aJeF7rXY._JA1wepFrePIgKkBuF4w%3D%3D&state=https%3A%2F%2Fdry-refuge-2742.herokuapp.com%2Fpeople%2F host=dry-refuge-2742.herokuapp.com fwd="206.218.52.33" dyno=web.1 connect=1ms service=446ms status=401 bytes=1083
2013-11-28T05:58:29.295172+00:00 app[web.1]:  at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:355)
2013-11-28T05:58:29.294965+00:00 app[web.1]:  at com.force.sdk.oauth.connector.ForceOAuthConnector.getAccessToken(ForceOAuthConnector.java:145)
2013-11-28T05:58:29.294965+00:00 app[web.1]:  at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:199)
2013-11-28T05:58:29.295172+00:00 app[web.1]:  at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:355)
2013-11-28T05:58:29.294965+00:00 app[web.1]:  at com.force.sdk.springsecurity.AuthenticationProcessingFilter.doFilter(AuthenticationProcessingFilter.java:109)
2013-11-28T05:58:29.294965+00:00 app[web.1]:  at com.force.sdk.springsecurity.AuthenticationProcessingFilter.attemptAuthentication(AuthenticationProcessingFilter.java:138)
2013-11-28T05:58:29.295172+00:00 app[web.1]:  at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilt
er(SecurityContextPersistenceFilter.java:79)
2013-11-28T05:58:29.295172+00:00 app[web.1]:  at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)
2013-11-28T05:58:29.295172+00:00 app[web.1]:  at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:259)
2013-11-28T05:58:29.295172+00:00 app[web.1]:  at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
2013-11-28T05:58:29.295172+00:00 app[web.1]:  at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:105)
2013-11-28T05:58:29.295172+00:00 app[web.1]:  at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:355)
2013-11-28T05:58:29.295416+00:00 app[web.1]:  at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
2013-11-28T05:58:29.295172+00:00 app[web.1]:  at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:149)
2013-11-28T05:58:29.295416+00:00 app[web.1]:  at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
2013-11-28T05:58:29.295416+00:00 app[web.1]:  at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
2013-11-28T05:58:29.295416+00:00 app[web.1]:  at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
2013-11-28T05:58:29.295172+00:00 app[web.1]:  at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
2013-11-28T05:58:29.295416+00:00 app[web.1]:  at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
2013-11-28T05:58:29.295416+00:00 app[web.1]:  at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1004)
2013-11-28T05:58:29.295946+00:00 app[web.1]:  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1146)
2013-11-28T05:58:29.295946+00:00 app[web.1]:  at java.lang.Thread.run(Thread.java:679)
2013-11-28T05:58:29.295416+00:00 app[web.1]:  at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
2013-11-28T05:58:29.295416+00:00 app[web.1]:  at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1653)
2013-11-28T05:58:29.295946+00:00 app[web.1]:  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
2013-11-28T05:58:29.295416+00:00 app[web.1]:  at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
2013-11-28T05:58:29.295416+00:00 app[web.1]:  at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
2013-11-28T05:58:24.518283+00:00 heroku[router]: at=info method=GET path=/people/ host=dry-refuge-2742.herokuapp.com fwd="206.218.52.33" dyno=web.1 connect=1ms service=5ms status=302 bytes=0
After some googling i found the problem was that in oAuth setting i had to add 2 scopes to Selected oAuth scopes
  1. Full Access(full)
  2. Perform request on your behalf at any time (refresh_token)
Once i set up the oAUth settings properly the sample started working

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