Java Spring Filters

Example code

@Component
public class CustomFilter extends OncePerRequestFilter {
	@Override
	protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) {
		// do something
		filterChain(request, response);
	}
}

Service Lazy Loading

• Service Layer Pattern

• ❓Unable to autowire the service inside my authentication filter in Spring

public class AuthenticationTokenProcessingFilter extends GenericFilterBean {
    private MyServices service;
    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        if(service==null){
            ServletContext servletContext = request.getServletContext();
            WebApplicationContext webApplicationContext = WebApplicationContextUtils.getWebApplicationContext(servletContext);
            service = webApplicationContext.getBean(MyServices.class);
        }
        your code ...    
    }
 
}