Why am I getting this "CONDITION EVALUATION DELTA" output?

Question

I made some changes on my server but I do not know which of these changes causes this log output:

==========================
CONDITION EVALUATION DELTA
==========================


Positive matches:
-----------------

    None


Negative matches:
-----------------

   SpringBootWebSecurityConfiguration:
      Did not match:
         - @ConditionalOnMissingBean (types: org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter; SearchStrategy: all) found beans of type 'org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter' org.springframework.security.oauth2.config.annotation.web.configuration.AuthorizationServerSecurityConfiguration, org.springframework.security.oauth2.config.annotation.web.configuration.ResourceServerConfiguration, webSecurityConfig (OnBeanCondition)
      Matched:
         - @ConditionalOnClass found required class 'org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter' (OnClassCondition)
         - found 'session' scope (OnWebApplicationCondition)

   UserDetailsServiceAutoConfiguration:
      Did not match:
         - @ConditionalOnMissingBean (types: org.springframework.security.authentication.AuthenticationManager,org.springframework.security.authentication.AuthenticationProvider,org.springframework.security.core.userdetails.UserDetailsService; SearchStrategy: all) found beans of type 'org.springframework.security.authentication.AuthenticationManager' authenticationManager and found beans of type 'org.springframework.security.core.userdetails.UserDetailsService' appUserDetailsService and found beans of type 'org.springframework.security.authentication.AuthenticationProvider' daoAuthenticationProvider (OnBeanCondition)
      Matched:
         - @ConditionalOnClass found required class 'org.springframework.security.authentication.AuthenticationManager' (OnClassCondition)

   WebSecurityEnablerConfiguration:
      Did not match:
         - @ConditionalOnMissingBean (names: springSecurityFilterChain; SearchStrategy: all) found beans named springSecurityFilterChain (OnBeanCondition)
      Matched:
         - found 'session' scope (OnWebApplicationCondition)


Exclusions:
-----------

    None


Unconditional classes:
----------------------

    None

This is really not telling me anything.

What does it even mean? Is there something broken because the server is still working fine.

Answer 1

The condition evaluation delta is a feature of Spring Boot's DevTools. It is described in the documentation as follows:

By default, each time your application restarts, a report showing the condition evaluation delta is logged. The report shows the changes to your application’s auto-configuration as you make changes such as adding or removing beans and setting configuration properties.

In the case shown in your question, some changes were made to security-related beans which affected security auto-configuration. There is nothing broken. The output is attempting to help you to understand how the changes you are making to your application are affecting its auto-configuration.

You can turn off the logging of the delta if you wish. To do so, set the following property:

spring.devtools.restart.log-condition-evaluation-delta=false