Why is my Spring Filter Invoked Twice When Registered as a Bean?

Filter Invoked Twice upon Registration as Spring Bean

Problem:

An attempt to utilize @Autowire with a Filter results in an unexpected double invocation of the filter. Upon closer examination, it is observed that Spring container triggers this additional invocation when the filter is registered as a bean.

Solution:

To resolve this issue, consider implementing one of the following approaches:

1. Disable Automatic Filter Registration:

   Avoid exposing the filter as a bean and manually register it with Spring Security instead. This prevents Spring Boot from automatically registering the filter twice.

2. Use FilterRegistrationBean:

   If dependency injection into the filter is necessary, it must be registered as a bean. However, to prevent automatic registration, a FilterRegistrationBean can be employed with the "enabled" property set to false. Example implementation:

@Bean
public FilterRegistrationBean registration(MyFilter filter) {
    FilterRegistrationBean<MyFilter> registration = new FilterRegistrationBean<>(filter);
    registration.setEnabled(false);
    return registration;
}

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