JVM 25 warning - remove usage of sun.misc.Unsafe

Open

#9,681 opened on Oct 7, 2025 6 comments 8 reactions 0 assignees View on GitHub

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Assessment

Difficulty: 4/5
Estimated time: 3-5 days
Newbie friendliness: 48/100

Issue type: Bug
Clarity: Mostly clear
Activity status: Quiet
Tech stack: java
Domain: backend

Research direction

Start by reproducing the Java 25 startup warning with dd-trace-java 1.53.0 and trace the reported net.bytebuddy.dynamic.loading.ClassInjector$UsingUnsafe$Dispatcher$CreationAction call in datadog-agent.jar. Compare the related OpenTelemetry issue and identify where the agent or dependency invokes sun.misc.Unsafe; done means startup produces no such warning on Java 25.

Written by the indexing model from the issue text.

Description

type: bug report

Tracer Version(s)

1.53.0

Java Version(s)

25.0.0

JVM Vendor

Amazon Corretto

Bug Report

We are starting to use Java 25 with a bunch of projects and saw this warning block at the top of the output:

WARNING: A terminally deprecated method in sun.misc.Unsafe has been called
WARNING: sun.misc.Unsafe::objectFieldOffset has been called by net.bytebuddy.dynamic.loading.ClassInjector$UsingUnsafe$Dispatcher$CreationAction (file:/usr/local/datadog-agent.jar)
WARNING: Please consider reporting this to the maintainers of class net.bytebuddy.dynamic.loading.ClassInjector$UsingUnsafe$Dispatcher$CreationAction
WARNING: sun.misc.Unsafe::objectFieldOffset will be removed in a future release

I think this is similar to https://github.com/open-telemetry/opentelemetry-java-instrumentation/issues/13375, would be nice if we could get rid of this warning and make the agent future proof. Maybe this is even coming from OpenTelemetry directly, feel free to close this issue then.

Expected Behavior

No warning during startup

Reproduction Code

No response

Dominant language: Java
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