Error Log

java.lang.IllegalStateException: Could not initialize plugin: interface org.mockito.plugins.MockMaker (alternate: null)
	at org.mockito.internal.configuration.plugins.PluginLoader$1.invoke(PluginLoader.java:85)
	at jdk.proxy2/jdk.proxy2.$Proxy44.isTypeMockable(Unknown Source)
	at org.mockito.internal.util.MockUtil.typeMockabilityOf(MockUtil.java:78)
	at org.mockito.internal.util.MockCreationValidator.validateType(MockCreationValidator.java:22)
	at org.mockito.internal.creation.MockSettingsImpl.validatedSettings(MockSettingsImpl.java:275)
	at org.mockito.internal.creation.MockSettingsImpl.build(MockSettingsImpl.java:236)
	at org.mockito.internal.MockitoCore.mock(MockitoCore.java:78)
	at org.mockito.Mockito.mock(Mockito.java:2235)
	at org.jivesoftware.Fixtures.mockXMPPServer(Fixtures.java:122)
	at org.jivesoftware.openfire.group.DefaultGroupProviderTest.setUp(DefaultGroupProviderTest.java:93)
Caused by: java.lang.IllegalStateException: Internal problem occurred, please report it. Mockito is unable to load the default implementation of class that is a part of Mockito distribution. Failed to load interface org.mockito.plugins.MockMaker
	at org.mockito.internal.configuration.plugins.DefaultMockitoPlugins.create(DefaultMockitoPlugins.java:105)
	at org.mockito.internal.configuration.plugins.DefaultMockitoPlugins.getDefaultPlugin(DefaultMockitoPlugins.java:79)
	at org.mockito.internal.configuration.plugins.PluginLoader.loadPlugin(PluginLoader.java:75)
	at org.mockito.internal.configuration.plugins.PluginLoader.loadPlugin(PluginLoader.java:49)
	at org.mockito.internal.configuration.plugins.PluginRegistry.<init>(PluginRegistry.java:29)
	at org.mockito.internal.configuration.plugins.Plugins.<clinit>(Plugins.java:26)
	at org.mockito.internal.MockitoCore.<clinit>(MockitoCore.java:74)
	at org.mockito.Mockito.<clinit>(Mockito.java:1810)
	... 2 more
Caused by: java.lang.reflect.InvocationTargetException
	at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:77)
	at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:500)
	at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:481)
	at org.mockito.internal.configuration.plugins.DefaultMockitoPlugins.create(DefaultMockitoPlugins.java:103)
	... 9 more
Caused by: org.mockito.exceptions.base.MockitoInitializationException: 
Could not initialize inline Byte Buddy mock maker.

It appears as if your JDK does not supply a working agent attachment mechanism.
Java               : 17
JVM vendor name    : Red Hat, Inc.
JVM vendor version : 17.0.18+8-LTS
JVM name           : OpenJDK 64-Bit Server VM
JVM version        : 17.0.18+8-LTS
JVM info           : mixed mode, sharing
OS name            : Linux
OS version         : 5.14.0-611.38.1.el9_7.x86_64

	at org.mockito.internal.creation.bytebuddy.InlineDelegateByteBuddyMockMaker.<init>(InlineDelegateByteBuddyMockMaker.java:279)
	at org.mockito.internal.creation.bytebuddy.InlineByteBuddyMockMaker.<init>(InlineByteBuddyMockMaker.java:23)
	... 15 more
Caused by: java.lang.IllegalStateException: 
Mockito could not self-attach a Java agent to the current VM. This feature is required for inline mocking.
This error occured due to an I/O error during the creation of this agent: java.io.IOException: Permission denied

Potentially, the current VM does not support the instrumentation API correctly
	at org.mockito.internal.creation.bytebuddy.InlineDelegateByteBuddyMockMaker.<clinit>(InlineDelegateByteBuddyMockMaker.java:210)
	... 16 more
Caused by: java.io.IOException: Permission denied
	at java.base/java.io.UnixFileSystem.createFileExclusively(Native Method)
	at java.base/java.io.File.createTempFile(File.java:2170)
	at java.base/java.io.File.createTempFile(File.java:2216)
	at org.mockito.internal.creation.bytebuddy.InlineDelegateByteBuddyMockMaker.<clinit>(InlineDelegateByteBuddyMockMaker.java:140)
	... 16 more