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seems that HDFS-based sources do not emit data (NullPointerException)."},"comment":{"url":"https://api.github.com/repos/ap0n/qm-issues/issues/comments/119109053","html_url":"https://github.com/ap0n/qm-issues/issues/26#issuecomment-119109053","issue_url":"https://api.github.com/repos/ap0n/qm-issues/issues/26","id":119109053,"user":{"login":"ap0n","id":3328707,"avatar_url":"https://avatars.githubusercontent.com/u/3328707?v=3","gravatar_id":"","url":"https://api.github.com/users/ap0n","html_url":"https://github.com/ap0n","followers_url":"https://api.github.com/users/ap0n/followers","following_url":"https://api.github.com/users/ap0n/following{/other_user}","gists_url":"https://api.github.com/users/ap0n/gists{/gist_id}","starred_url":"https://api.github.com/users/ap0n/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/ap0n/subscriptions","organizations_url":"https://api.github.com/users/ap0n/orgs","repos_url":"https://api.github.com/users/ap0n/repos","events_url":"https://api.github.com/users/ap0n/events{/privacy}","received_events_url":"https://api.github.com/users/ap0n/received_events","type":"User","site_admin":false},"created_at":"2015-07-07T07:54:19Z","updated_at":"2015-07-07T07:54:19Z","body":"Please make sure that the input type is `IFCorrelationTwitter.IIFCorrelationTwitterAnalyzedStreamInput`. What happens now is that the cast `(IFCorrelationTwitter.IIFCorrelationTwitterAnalyzedStreamInput) tuple.get(0)` fails and it throws the exception. If I recall correctly, the output type of the SentimentAnalysis sub-topology is not the same as the input type of the TwitterCorrelation sub-topology."}}