What is chain.doFilter doing in Filter.doFilter method?

java servlet-filters
giri picture giri · Jan 13, 2010 · Viewed 67.9k times · Source

In a Filter.doFilter method I made this call chain.doFilter.

What is doFilter doing inside a doFilter? Isn't it a recursive call?

Answer

Bozho picture Bozho · Jan 13, 2010

Servlet Filters are an implementation of the Chain of responsibility design pattern.

All filters are chained (in the order of their definition in web.xml). The chain.doFilter() is proceeding to the next element in the chain. The last element of the chain is the target resource/servlet.

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