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Terminally deprecated method warnings appearing in application startup logs #4610
Description
Expected behavior
No warnings appearing in logs on application startup
Actual behavior
We receive the following warnings
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$CreationAction (file:/app/agent.jar)
WARNING: Please consider reporting this to the maintainers of class net.bytebuddy.dynamic.loading.ClassInjector$UsingUnsafe$Dispatcher$CreationAction
WARNING: sun.misc.Unsafe::objectFieldOffset will be removed in a future release
WARNING: A restricted method in java.lang.System has been called
WARNING: java.lang.System::loadLibrary has been called by io.netty.util.internal.NativeLibraryUtil in an unnamed module (file:/app/agent.jar)
WARNING: Use --enable-native-access=ALL-UNNAMED to avoid a warning for callers in this module
WARNING: Restricted methods will be blocked in a future release unless native access is enabled
To Reproduce
These warnings have only started appearing since we switched from Java 21 to Java 25.
They appear on any Spring Boot application at startup using the java agent (see https://learn.microsoft.com/en-us/azure/azure-monitor/app/java-spring-boot#enabling-with-jvm-argument).
So one of my previous PRs (microsoft/ApplicationInsights-Java-Repros#15) is sufficient to show the issue. Assembling the jar file and then running
java -Dapplicationinsights.connection.string=<connection string> -javaagent:<path to agent>/applicationinsights-agent-3.7.7.jar -jar build/libs/gradle-0.0.1-SNAPSHOT.jarwill do the trick.
System information
Please provide the following information:
- SDK Version: 25
- OS type and version: We run eclipse-temurin:25-jre-jammy, but any should replicate. Also replicated on MacOS Tahoe.
- Application Server type and version (if applicable): Spring Boot 4
- Using spring-boot? Yes
- Additional relevant libraries (with version, if applicable):
Activity
trask commentedon Feb 5, 2026
Hi petergphillips! This should be resolved once we update to the latest OpenTelemetry version (see open-telemetry/opentelemetry-java#7691)
petergphillips commentedon Mar 30, 2026
Now fixed