## org.springframework.web.filter
Class RequestContextFilter

    java.lang.Object
      org.springframework.web.filter.GenericFilterBean
          org.springframework.web.filter.OncePerRequestFilter
              org.springframework.web.filter.RequestContextFilter

All Implemented Interfaces:
  Filter, BeanNameAware, DisposableBean, InitializingBean, ServletContextAware

    public class RequestContextFilter

extends OncePerRequestFilter

Servlet 2.3 Filter that exposes the request to the current thread, through both `LocaleContextHolder` and `RequestContextHolder`. To be registered as filter in `web.xml`.

Alternatively, Spring's `RequestContextListener` and Spring's `DispatcherServlet` also expose the same request context to the current thread.

This filter is mainly for use with third-party servlets, e.g. the JSF FacesServlet. Within Spring's own web support, DispatcherServlet's processing is perfectly sufficient.

Since:
  2.0
Author:
  Juergen Hoeller, Rod Johnson
See Also:
  `LocaleContextHolder`, `RequestContextHolder`, `RequestContextListener`, `DispatcherServlet`

Field Summary

Fields inherited from class org.springframework.web.filter.OncePerRequestFilter
`ALREADY_FILTERED_SUFFIX`

Fields inherited from class org.springframework.web.filter.GenericFilterBean
`logger`

Constructor Summary
`RequestContextFilter()`

Method Summary
`protected void` `doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain)` Same contract as for `doFilter`, but guaranteed to be just invoked once per request.
`void` `setThreadContextInheritable(boolean threadContextInheritable)` Set whether to expose the LocaleContext and RequestAttributes as inheritable for child threads (using an `InheritableThreadLocal`).

Methods inherited from class org.springframework.web.filter.OncePerRequestFilter
`doFilter, getAlreadyFilteredAttributeName, shouldNotFilter`

Methods inherited from class org.springframework.web.filter.GenericFilterBean
`addRequiredProperty, afterPropertiesSet, destroy, getFilterConfig, getFilterName, getServletContext, init, initBeanWrapper, initFilterBean, setBeanName, setServletContext`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### RequestContextFilter

    public RequestContextFilter()

Method Detail

### setThreadContextInheritable

    public void setThreadContextInheritable(boolean threadContextInheritable)

  Set whether to expose the LocaleContext and RequestAttributes as inheritable for child threads (using an `InheritableThreadLocal`).

  Default is "false", to avoid side effects on spawned background threads. Switch this to "true" to enable inheritance for custom child threads which are spawned during request processing and only used for this request (that is, ending after their initial task, without reuse of the thread).

  WARNING: Do not use inheritance for child threads if you are accessing a thread pool which is configured to potentially add new threads on demand (e.g. a JDK `ThreadPoolExecutor`), since this will expose the inherited context to such a pooled thread.

### doFilterInternal

    protected void doFilterInternal(HttpServletRequest request,
                                    HttpServletResponse response,
                                    FilterChain filterChain)
                             throws ServletException,
                                    IOException

  Description copied from class: `OncePerRequestFilter`
  Same contract as for `doFilter`, but guaranteed to be just invoked once per request. Provides HttpServletRequest and HttpServletResponse arguments instead of the default ServletRequest and ServletResponse ones.

  Specified by:
    `doFilterInternal` in class `OncePerRequestFilter`
  Throws:
    `ServletException`
    `IOException`

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