Natural Language Processing engine integration

Employee

Natural Language Processing engine integration

Hi Everyone, has anyone had to use an external 3rd party open source solution for sentiment analyses based on context?
I know the Big Data Sandbox has a Twitter/Sentiment Analyses example but that is based on key-word matching and sentiment weighting based on individual words. I need something that makes use of the contextual information within a sentence. Any help or useful suggestions are greatly appreciated. 
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Re: Natural Language Processing engine integration

I only know about tools related to the language R (which is Open Source). For R exists a couple of java libraries.
Another tool is the data miner (also Open Source) and can be included in Java applications (e.g. Talend ;-)