web/src/main/java/org/springframework/security/web/context/AbstractSecurityWebApplicationInitializer.java
private final void registerFilter(ServletContext servletContext,
			boolean insertBeforeOtherFilters, String filterName, Filter filter) {
		Dynamic registration = servletContext.addFilter(filterName, filter);
		if (registration == null) {
			throw new IllegalStateException(
					"Duplicate Filter registration for '" + filterName
							+ "'. Check to ensure the Filter is only configured once.");
		}
		registration.setAsyncSupported(isAsyncSecuritySupported());
		EnumSet<DispatcherType> dispatcherTypes = getSecurityDispatcherTypes();
		registration.addMappingForUrlPatterns(dispatcherTypes, !insertBeforeOtherFilters,
				"/*");
	}
private final void registerFilter(ServletContext servletContext,
			boolean insertBeforeOtherFilters, String filterName, Filter filter) {
		Dynamic registration = servletContext.addFilter(filterName, filter);
		if (registration == null) {
			throw new IllegalStateException(
					"Duplicate Filter registration for '" + filterName
							+ "'. Check to ensure the Filter is only configured once.");
		}
		registration.setAsyncSupported(isAsyncSecuritySupported());
		EnumSet<DispatcherType> dispatcherTypes = getSecurityDispatcherTypes();
		registration.addMappingForUrlPatterns(dispatcherTypes, !insertBeforeOtherFilters,
				"/*");
	}
private final void registerFilter ( ServletContext servletContext , boolean insertBeforeOtherFilters , String filterName , Filter filter ) { Dynamic registration = servletContext . addFilter ( filterName , filter ) ; if ( registration == null ) { throw new IllegalStateException ( "Duplicate Filter registration for '" + filterName + "'. Check to ensure the Filter is only configured once." ) ; } registration . setAsyncSupported ( isAsyncSecuritySupported ( ) ) ; EnumSet < DispatcherType > dispatcherTypes = getSecurityDispatcherTypes ( ) ; registration . addMappingForUrlPatterns ( dispatcherTypes , ! insertBeforeOtherFilters , "/*" ) ; }
Registers the provided filter using the {@link #isAsyncSecuritySupported()} and
{@link #getSecurityDispatcherTypes()}.

@param servletContext
@param insertBeforeOtherFilters should this Filter be inserted before or after
other {@link Filter}
@param filterName
@param filter
Registers the provided filter using the { @link #isAsyncSecuritySupported () } and { @link #getSecurityDispatcherTypes () } .