Hi
I've got a Liferay (4.3.4) portal that stores some files in its Document Library. My goal is to create a crawler that (periodically) visits all documents stored in the Document Library to create a detailed documents list. Created list will be compared with the older list to detect which documents are new/changed/deleted. The new/changed files fill be retrived from the Document Library and processed. The prefered interface for clawler to use is a webservice interface.
I am a newbie and I search for some java examples/documentation/hints where to start. Any help will be appeciated.

Regards
JanK

I am not sure why would you need that.

Are you going to have several sites with the same set of documents that you would try to compare?

You can always use the db to get the list of documents and latest ones. Liferay uses jackrabbit to store documents (http://jackrabbit.apache.org/) - you can look for code examples there. You can also look at Document Library portlet to see how it works.

I create (lucene based, Liferay independent)a search engine that searches for data retrived from different datasources like: filesystem, database, Liferay Document Library, other.I know that Liferay has its own search engine but I can't use it, instead I must retrive documents stored in its Document Library and index it on my own.

Regards
JanK

I'm pretty sure that you don't need this information now, but Liferay has a feature to list the latest changed document.