Error bean securityConfig: unresolvable circular reference

Problem

Recently while I was working with Spring Security in recent versions of Spring Boot framework (2.6.6/2.6.7), I was getting the following error (Requested bean is currently in creation: Is there an unresolvable circular reference?):

o.s.boot.SpringApplication               : Application run failed

org.springframework.beans.factory.BeanCurrentlyInCreationException: Error creating bean with name 'securityConfig': Requested bean is currently in creation: Is there an unresolvable circular reference?

The class SecurityConfig (hence the bean name inferred as securityConfig) extends WebSecurityConfigurerAdapter class. This (SecurityConfig) is a configuration class using @Configuration & @EnableWebSecurity annotations.

The SecurityConfig class is given below:

@Configuration
@EnableWebSecurity
@EnableGlobalMethodSecurity(prePostEnabled = true)
public class SecurityConfig extends WebSecurityConfigurerAdapter {

	@Autowired
	public void registerGlobal(AuthenticationManagerBuilder auth) throws Exception {
		auth.inMemoryAuthentication().passwordEncoder(passwordEncoder()).withUser("user")
				.password("$2a$10$9Xn39aPf4LhDpRGNWvDFqu.T5ZPHbyh8iNQDSb4aNSnLqE2u2efIu").roles("USER").and()
				.passwordEncoder(passwordEncoder()).withUser("admin")
				.password("$2a$10$dl8TemMlPH7Z/mpBurCX8O4lu0FoWbXnhsHTYXVsmgXyzagn..8rK").roles("USER", "ADMIN");
	}

	@Bean
	public PasswordEncoder passwordEncoder() {
		return new BCryptPasswordEncoder();
	}

}

Solutions

Not exactly known what was the issue, but here are some solutions that worked for me.

Override configure() Method

I replaced the following code:

@Autowired
public void registerGlobal(AuthenticationManagerBuilder auth) throws Exception {
	...
}

by

@Override
public void configure(AuthenticationManagerBuilder auth) throws Exception {
	...
}

So basically instead of auto-wiring the method I have overridden the method configure() from the super class WebSecurityConfigurerAdapter.

Move PasswordEncoder in Separate Class

Another solution is moving the passwordEncoder() method into a separate class for creating PasswordEncoder instance. In this case, you don’t need to override the method configure() from parent class WebSecurityConfigurerAdapter.

Create a similar class for the PasswordEncoder bean as given below:

@Configuration
public class EncoderConfig {

	@Bean
	PasswordEncoder passwordEncoder() {
		return new BCryptPasswordEncoder();
	}

}

Now you can use the password encode in the following manner:

public class SecurityConfig extends WebSecurityConfigurerAdapter {
	
	@Autowired
	private PasswordEncoder passwordEncoder;

	@Autowired
	public void registerGlobal(AuthenticationManagerBuilder auth) throws Exception {
		auth.inMemoryAuthentication().passwordEncoder(passwordEncoder).withUser("user")
				.password("$2a$10$9Xn39aPf4LhDpRGNWvDFqu.T5ZPHbyh8iNQDSb4aNSnLqE2u2efIu").roles("USER").and()
				.passwordEncoder(passwordEncoder).withUser("admin")
				.password("$2a$10$dl8TemMlPH7Z/mpBurCX8O4lu0FoWbXnhsHTYXVsmgXyzagn..8rK").roles("USER", "ADMIN");
	}
	
}

Sample Code

You can download the sample code used in this example.

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