java bytecode

• https://www.infoq.com/minibooks/emag-java-agents-bytecode
• http://spring.io/blog/2014/11/09/springone2gx-2014-replay-living-in-the-matrix-with-bytecode-manipulation
  • http://www.slideshare.net/SpringCentral/bytecode-spring2gx2014
• 스프링캠프 2016 : BCI(BYTE CODE INSTRUMET) 기술 소개 및 활용 방안

예제

• https://github.com/spring-projects/spring-framework/blob/master/spring-context/src/main/java/org/springframework/context/annotation/ClassPathScanningCandidateComponentProvider.java
• https://github.com/spring-projects/spring-framework/blob/master/spring-core/src/main/java/org/springframework/core/type/classreading/SimpleMetadataReader.java
• https://github.com/spring-projects/spring-framework/commit/c16f18a5fd659f34d6290b5f2cffe54534b7592a

BCI (Bytecode Instrumentation)

• Power of bytecode instrumentation in java

Library

ASM

CGLIB 가 사용 ( CGLIB is a higher abstraction than ASM. )

• ASM 개요
• ASM 클래스 만들기
• ASM의 Visitor패턴 :

BCEL

• Findbugs, AspectJ, Spring의 CGLIB→ Javassit migration :https://jira.springsource.org/browse/SPR-8190

SERP

• http://serp.sourceforge.net/

Javassist

• https://github.com/jboss-javassist/javassist

비교

• http://www.java-opensource.com/open-source/bytecode-libraries.html
• BCEL vs ASM : http://blog.naver.com/PostView.nhn?blogId=junsu60&logNo=80123035668

Framework 의존성

• Hibenate의 Javassist → Bytebuddy : https://github.com/hibernate/hibernate-orm/pull/1622
• Spring의 관련 이슈
  • Support for ByteBuddy as an alternative to CGLIB [SPR-8190]
    • 2011년 처음 생성
    • 2012.10.17 기준으로는 제목이 'Migrate from CGLIB to Javassist'
    • 2022.09.08 기준으로는 제목이 'Support for ByteBuddy as an alternative to CGLIB', 6.x backlog로 마일스톤이 기록
  • https://github.com/spring-projects/spring-framework/issues/7964 (2007년)
    • 'Cglib appears to be a poorly maintained and dying project. It would be nice to replace it with a more actively maintained project like javaassist for library dependency reasons.'