pinpoint-apm/pinpoint

MatchableClassFileTransformerDispatcher not apply on All Classes

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#3,687 opened on Jan 8, 2018

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 (9 comments) (0 reactions) (0 assignees)Java (3,735 forks)batch import
help wantedmodule:plugin

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Description

Description

I wrote KafkaConsumer plugin，then a very strange thing happens. I have print out all the MatchableClassFileTransformerGuardDelegate . And I can see 'SubscriptionState' class has a MatchableClassFileTransformerGuardDelegate transformer {matcher=DefaultClassNameMatcher{org.apache.kafka.clients.consumer.internals.SubscriptionState}, transformCallback=com.navercorp.pinpoint.plugin.kafka.KafkaClientPlugin$1@3dd6db4a} But The transformer has not been applied. (Noexception happens of course) Similar like https://stackoverflow.com/questions/34285862/java-agent-transform-not-applied-on-all-classes

Contributor guide

Research direction
Investigate why the MatchableClassFileTransformerGuardDelegate transformer targeting SubscriptionState is not applied. Check class loading order, transformer registration, and ensure the transformer is added before the class is loaded. Compare with similar issues like the StackOverflow reference.
Tech stack
java
Domain
observabilitybackend
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Mostly clear
Prerequisites
JavaInstrumentation
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
50