https://docs.spring.io/spring-framework/docs/6.1.16/javadoc-api/org/springframework/aop/target/SingletonTargetSource.html
SingletonTargetSource (Spring Framework 6.1.16 API)
declaration: package: org.springframework.aop.target, class: SingletonTargetSource
spring frameworkapi
https://docs.spring.io/spring-framework/docs/4.1.9.RELEASE/javadoc-api/org/springframework/aop/target/SingletonTargetSource.html
SingletonTargetSource (Spring Framework 4.1.9.RELEASE API)
spring frameworkreleaseapi