There was 1 failure:
1) classNameFromTypeElementDoesntUseGetKind(com.squareup.javapoet.ClassNameTest)
org.mockito.exceptions.base.MockitoException: 
Mockito cannot mock this class: class com.sun.tools.javac.code.Symbol$ClassSymbol.

Mockito can only mock non-private & non-final classes.
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Java               : 25
JVM vendor name    : Gentoo
JVM vendor version : 25+17
JVM name           : OpenJDK 64-Bit Server VM
JVM version        : 25+17
JVM info           : mixed mode, sharing
OS name            : Linux
OS version         : 6.12.21-gentoo


Underlying exception : org.mockito.exceptions.base.MockitoException: 
Could not force module adjustment of the module of class com.sun.tools.javac.code.Symbol$ClassSymbol

This is required to adjust the module graph to enable mock creation
	at com.squareup.javapoet.ClassNameTest.preventGetKind(ClassNameTest.java:134)
	at com.squareup.javapoet.ClassNameTest.classNameFromTypeElementDoesntUseGetKind(ClassNameTest.java:122)
	... 45 trimmed
Caused by: org.mockito.exceptions.base.MockitoException: 
Could not force module adjustment of the module of class com.sun.tools.javac.code.Symbol$ClassSymbol

This is required to adjust the module graph to enable mock creation
	at net.bytebuddy.TypeCache.findOrInsert(TypeCache.java:168)
	at net.bytebuddy.TypeCache$WithInlineExpunction.findOrInsert(TypeCache.java:399)
	at net.bytebuddy.TypeCache.findOrInsert(TypeCache.java:190)
	at net.bytebuddy.TypeCache$WithInlineExpunction.findOrInsert(TypeCache.java:410)
	... 48 more
Caused by: java.lang.IllegalArgumentException: com.sun.tools.javac.code.Symbol$ClassSymbol$MockitoModuleProbe$58544662 must be defined in the same package as org.mockito.codegen.InjectionBase
	at net.bytebuddy.dynamic.loading.ClassInjector$UsingLookup.injectRaw(ClassInjector.java:1683)
	at net.bytebuddy.dynamic.loading.ClassInjector$AbstractBase.injectRaw(ClassInjector.java:167)
	at net.bytebuddy.dynamic.loading.ClassInjector$AbstractBase.inject(ClassInjector.java:155)
	at net.bytebuddy.dynamic.loading.ClassLoadingStrategy$UsingLookup.load(ClassLoadingStrategy.java:519)
	at net.bytebuddy.dynamic.TypeResolutionStrategy$Passive.initialize(TypeResolutionStrategy.java:101)
	at net.bytebuddy.dynamic.DynamicType$Default$Unloaded.load(DynamicType.java:6432)
	at org.mockito.internal.creation.bytebuddy.ModuleHandler$ModuleSystemFound.adjustModuleGraph(ModuleHandler.java:198)
	at org.mockito.internal.creation.bytebuddy.SubclassBytecodeGenerator.mockClass(SubclassBytecodeGenerator.java:106)
	at org.mockito.internal.creation.bytebuddy.TypeCachingBytecodeGenerator$1.call(TypeCachingBytecodeGenerator.java:37)
	at org.mockito.internal.creation.bytebuddy.TypeCachingBytecodeGenerator$1.call(TypeCachingBytecodeGenerator.java:34)
	at net.bytebuddy.TypeCache.findOrInsert(TypeCache.java:168)
	at net.bytebuddy.TypeCache$WithInlineExpunction.findOrInsert(TypeCache.java:399)
	at net.bytebuddy.TypeCache.findOrInsert(TypeCache.java:190)
	at net.bytebuddy.TypeCache$WithInlineExpunction.findOrInsert(TypeCache.java:410)
	at org.mockito.internal.creation.bytebuddy.TypeCachingBytecodeGenerator.mockClass(TypeCachingBytecodeGenerator.java:32)
	at org.mockito.internal.creation.bytebuddy.SubclassByteBuddyMockMaker.createMockType(SubclassByteBuddyMockMaker.java:71)
	at org.mockito.internal.creation.bytebuddy.SubclassByteBuddyMockMaker.createMock(SubclassByteBuddyMockMaker.java:42)
	at org.mockito.internal.creation.bytebuddy.ByteBuddyMockMaker.createMock(ByteBuddyMockMaker.java:25)
	at org.mockito.internal.util.MockUtil.createMock(MockUtil.java:35)
	at org.mockito.internal.MockitoCore.mock(MockitoCore.java:62)
	at org.mockito.Mockito.spy(Mockito.java:1992)
	... 48 more

FAILURES!!!
Tests run: 383,  Failures: 1

With Java versions 21 and lower the tests pass.

--- a/src/test/java/com/squareup/javapoet/ClassNameTest.java
+++ b/src/test/java/com/squareup/javapoet/ClassNameTest.java
@@ -21,6 +21,7 @@ import javax.lang.model.element.TypeElement;
 import javax.lang.model.util.Elements;
 import org.junit.Rule;
 import org.junit.Test;
+import org.junit.Ignore;
 import org.junit.runner.RunWith;
 import org.junit.runners.JUnit4;
 import org.mockito.Mockito;
@@ -116,7 +117,7 @@ public final class ClassNameTest {
    * Buck builds with "source-based ABI generation" and those builds don't support
    * {@link TypeElement#getKind()}. Test to confirm that we don't use that API.
    */
-  @Test public void classNameFromTypeElementDoesntUseGetKind() {
+  @Test @Ignore public void classNameFromTypeElementDoesntUseGetKind() {
     Elements elements = compilationRule.getElements();
     TypeElement object = elements.getTypeElement(Object.class.getCanonicalName());
     assertThat(ClassName.get(preventGetKind(object)).toString())