I am using a third party filter in my Spring Boot 3.x.x application. This particular filter implements the javax.servlet.Filter.

import javax.servlet.Filter;
public class ThirdPartyFilter implements Filter { }

I created a FilterRegistrationBean to register ThirdPartyFilter as below:

@Configuration
public class FilterConfiguration {

    @Bean
    public FilterRegistrationBean<ThirdPartyFilter> thirdPartyFilter() {
       FilterRegistrationBean<ThirdPartyFilter> registration = new FilterRegistrationBean<>();
       registration.setFilter(new ThirdPartyFilter());
       return registration;
    }
}

However, the issue is that FilterRegistrationBean extends the jakarta.servlet.Filter which is different from the filter that ThirdPartyFilter implements. It basically gives this error:

Type parameter
‘com.med.filter.ThirdPartyFilter’ is not
within its bound; should implement ‘jakarta.servlet.Filter’

What can be done (but not considering these options):

• Downgrading the Spring Boot version for my application from 3.x.x to 2.x.x works fine since the FilterRegistrationBean in older versions extends javax.servlet.Filter but I don’t want to change the version.
• I don’t have the ability to modify/update the third party filter to implement jakarta.servlet.Filter instead of javax.servlet.Filter.

What I tried:

• I created a simple bean as below but it doesn’t seem to initialize or invoke the filter.

  @Bean
  public ThirdPartyFilter thirdPartyFilter() {
     return new ThirdPartyFilter();
  }
  

I’m not sure what other options are available. Any suggestions will be greatly appreciated.