opensource websites backend in java [closed]

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Are there any opensource websites backend in java?

Just like reddit in python, and openstreet in ruby.

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So, you're looking for a Java open source CMS (Content Management System)?

You can find here an overview of the most of them: Open Source CMS in Java. Wikipedia also has an overview of some of them: List of CMS in Java.

The popular ones are Alfresco, Nuxeo and Liferay. You can compare the detailed features on the CMS Matrix site.

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ThingLink is a finnish service with a custom build Java backend. The backend code is hosted on SourceForge.

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Do you mean web frameworks? If so there are loads: http://java-source.net/open-source/web-frameworks

Edit: Tapestry 5 is great.