reactor / reactor/BlockHound

Application does not start with BlockHound and ReactorDebugAgent installed on java 8

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area/java-agent status/has-workaround status/on-hold type/bug
Dominant language
Java
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Description

BlockHound and ReactorDebugAgent cannot work together on java 8.
Application fails with error

java.util.ServiceConfigurationError: com.sun.tools.attach.spi.AttachProvider: Provider sun.tools.attach.WindowsAttachProvider could not be instantiated
java.lang.ExceptionInInitializerError
Caused by: java.lang.IllegalStateException: Error during attachment using: reactor.tools.shaded.net.bytebuddy.agent.ByteBuddyAgent$AttachmentProvider$Compound@53aac487
	at reactor.tools.shaded.net.bytebuddy.agent.ByteBuddyAgent.install(ByteBuddyAgent.java:400)
	at reactor.tools.shaded.net.bytebuddy.agent.ByteBuddyAgent.install(ByteBuddyAgent.java:374)
	at reactor.tools.shaded.net.bytebuddy.agent.ByteBuddyAgent.install(ByteBuddyAgent.java:342)
	at reactor.tools.shaded.net.bytebuddy.agent.ByteBuddyAgent.install(ByteBuddyAgent.java:328)
	at reactor.tools.agent.ReactorDebugAgent.init(ReactorDebugAgent.java:41)
	at com.example.demo.ReactorDebugApplication.<clinit>(ReactorDebugApplication.java:27)
Caused by: java.lang.reflect.InvocationTargetException
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at reactor.tools.shaded.net.bytebuddy.agent.Attacher.install(Attacher.java:99)
	at reactor.tools.shaded.net.bytebuddy.agent.ByteBuddyAgent.install(ByteBuddyAgent.java:395)
	... 5 more
Caused by: com.sun.tools.attach.AttachNotSupportedException: no providers installed
	at com.sun.tools.attach.VirtualMachine.attach(VirtualMachine.java:203)
	... 11 more
Exception in thread "main" 

If I try to start application using java 11 or just disable BlockHound or ReactorDebugAgent (in the code and spring-boot integration) everything works fine.

Expected Behavior

application starts

Actual Behavior

application start fails

Steps to Reproduce

try to start application on java 8
https://github.com/robotmrv/reactor-debug-error

Possible Solution

Your Environment

  • Reactor version(s) used:
    io.projectreactor:reactor-core:3.3.0.RELEASE
    io.projectreactor:reactor-tools:3.3.0.RELEASE
    io.projectreactor.tools:blockhound:1.0.1.RELEASE
  • Other relevant libraries versions (eg. netty, ...):
  • JVM version (javar -version):
    java version "1.8.0_231"
    Java(TM) SE Runtime Environment (build 1.8.0_231-b11)
    Java HotSpot(TM) 64-Bit Server VM (build 25.231-b11, mixed mode)
  • OS and version (eg uname -a):
    Win 10

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Reproduce the failure from the linked robotmrv/reactor-debug-error example on Windows with Java 8, BlockHound, and ReactorDebugAgent enabled, then compare it with Java 11 and with either agent disabled. Start at ReactorDebugAgent.init and the ByteBuddyAgent.install stack frames; done means the application starts successfully on Java 8 with both agents enabled.

Written by the indexing model from the issue text.

Assessment

Tech stack
java
Domain
devtools
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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