Silence warning with latest Java LTS (25) in maven 3.9.x

[mpetricek-corp]

When used with latest Java LTS (i.e. 25 at the moment), maven 3.9.x outputs a warning:

WARNING: A terminally deprecated method in sun.misc.Unsafe has been called
WARNING: sun.misc.Unsafe::objectFieldOffset has been called by com.google.common.util.concurrent.AbstractFuture$UnsafeAtomicHelper (file:/usr/share/maven/lib/guava.jar)
WARNING: Please consider reporting this to the maintainers of class com.google.common.util.concurrent.AbstractFuture$UnsafeAtomicHelper
WARNING: sun.misc.Unsafe::objectFieldOffset will be removed in a future release

Properly fixing this in 3.9.x branch would mean upgrading Guava to newer version, which I understood is impossible due to dependency version collisions/limitations.
This fix silences the warning, in similar manner to MNG-8248

• I hereby declare this contribution to be licenced under the Apache License Version 2.0, January 2004

[slawekjaranowski]

how can I reproduce such warning ...

[cstamas]

Isn't this 26 and not 25?

[slawekjaranowski]

even with 26 I can not see it

[Bukama]

From my expierence this comes from dependencies. For example when building maven core project with Maven 3.9.12 and Java 25 some tests throw this

D:\Github\Maven\maven>mvn clean verify site > ..\maven_build.log
WARNING: A terminally deprecated method in sun.misc.Unsafe has been called
WARNING: sun.misc.Unsafe::staticFieldBase has been called by com.diffplug.spotless.java.ModuleHelper (file:/C:/Users/matth/.m2/repository/com/diffplug/spotless/spotless-lib/4.0.0/spotless-lib-4.0.0.jar)
WARNING: Please consider reporting this to the maintainers of class com.diffplug.spotless.java.ModuleHelper
WARNING: sun.misc.Unsafe::staticFieldBase will be removed in a future release
OpenJDK 64-Bit Server VM warning: Sharing is only supported for boot loader classes because bootstrap classpath has been appended
OpenJDK 64-Bit Server VM warning: Sharing is only supported for boot loader classes because bootstrap classpath has been appended
OpenJDK 64-Bit Server VM warning: Sharing is only supported for boot loader classes because bootstrap classpath has been appended
OpenJDK 64-Bit Server VM warning: Sharing is only supported for boot loader classes because bootstrap classpath has been appended
OpenJDK 64-Bit Server VM warning: Sharing is only supported for boot loader classes because bootstrap classpath has been appended
OpenJDK 64-Bit Server VM warning: Sharing is only supported for boot loader classes because bootstrap classpath has been appended
WARNING: A restricted method in java.lang.System has been called
WARNING: java.lang.System::load has been called by org.jline.nativ.JLineNativeLoader in an unnamed module (file:/C:/Users/matth/.m2/repository/org/jline/jline-native/3.30.6/jline-native-3.30.6.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

OpenJDK 64-Bit Server VM warning: Sharing is only supported for boot loader classes because bootstrap classpath has been appended
OpenJDK 64-Bit Server VM warning: Sharing is only supported for boot loader classes because bootstrap classpath has been appended
OpenJDK 64-Bit Server VM warning: Sharing is only supported for boot loader classes because bootstrap classpath has been appended
WARNING: A terminally deprecated method in sun.misc.Unsafe has been called
WARNING: sun.misc.Unsafe::staticFieldBase has been called by com.google.inject.internal.aop.HiddenClassDefiner (file:/C:/Users/matth/.m2/repository/com/google/inject/guice/5.1.0/guice-5.1.0-classes.jar)
WARNING: Please consider reporting this to the maintainers of class com.google.inject.internal.aop.HiddenClassDefiner
WARNING: sun.misc.Unsafe::staticFieldBase will be removed in a future release
WARNING: A restricted method in java.lang.System has been called
WARNING: java.lang.System::load has been called by org.fusesource.jansi.internal.JansiLoader in an unnamed module (file:/D:/Github/Maven/maven/impl/maven-executor/target/dependency/apache-maven-3.9.11/lib/jansi-2.4.2.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

WARNING: A terminally deprecated method in sun.misc.Unsafe has been called
WARNING: sun.misc.Unsafe::staticFieldBase has been called by com.google.inject.internal.aop.HiddenClassDefiner (file:/D:/Github/Maven/maven/impl/maven-executor/target/dependency/apache-maven-3.9.11/lib/guice-5.1.0-classes.jar)
WARNING: Please consider reporting this to the maintainers of class com.google.inject.internal.aop.HiddenClassDefiner
WARNING: sun.misc.Unsafe::staticFieldBase will be removed in a future release

[slawekjaranowski]

for spotless:

• A terminally deprecated method in sun.misc.Unsafe has been called diffplug/spotless#2808

[mpetricek-corp]

I observed it on debian, with system openJDK 25 installed. Not sure if different instantiation of JDK 25 could silence that warning by default.