content: /*
   * Copyright The OpenTelemetry Authors
   * SPDX-License-Identifier: Apache-2.0
   */
  
  package com.example.hello;
  
  import java.io.IOException;
  import javax.servlet.Filter;
  import javax.servlet.FilterChain;
  import javax.servlet.FilterConfig;
  import javax.servlet.ServletException;
  import javax.servlet.ServletRequest;
  import javax.servlet.ServletResponse;
  import javax.servlet.http.HttpServletRequest;
  import org.springframework.stereotype.Component;
  
  @Component("testFilter")
  public class TestFilter implements Filter {
    public TestFilter() {}
  
    @Override
    public void init(FilterConfig filterConfig) {}
  
    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
        throws IOException, ServletException {
      HttpServletRequest httpServletRequest = (HttpServletRequest) request;
      // To test OpenTelemetryHandlerMappingFilter we need to stop the request before it reaches
      // HandlerAdapter which gives server span the same name as OpenTelemetryHandlerMappingFilter.
      // Throwing an exception from servlet filter works for that.
      if (httpServletRequest.getRequestURI().contains("exception")) {
        throw new ServletException("exception");
      }
  
      chain.doFilter(request, response);
    }
  
    @Override
    public void destroy() {}
  }
  