https://docs.spring.io/spring-ldap/reference/api/java/org/springframework/ldap/pool/DelegatingDirContext.html
DelegatingDirContext
declaration: package: org.springframework.ldap.pool, class: DelegatingDirContext
https://docs.spring.io/spring-ldap/reference/api/java/org/springframework/ldap/pool2/DelegatingDirContext.html
DelegatingDirContext
declaration: package: org.springframework.ldap.pool2, class: DelegatingDirContext