Throws IllegalStateException when mocking interface

Using Mockito 2.20.1

Mockito cannot mock this class: interface com.lmax.monitoring.MetricPublisher.

Mockito can only mock non-private & non-final classes.
If you're not sure why you're getting this error, please report to the mailing list.


Java               : 1.8
JVM vendor name    : Oracle Corporation
JVM vendor version : 25.172-b11
JVM name           : Java HotSpot(TM) 64-Bit Server VM
JVM version        : 1.8.0_172-b11
JVM info           : mixed mode
OS name            : Linux
OS version         : 4.17.7-200.fc28.x86_64


Underlying exception : java.lang.IllegalStateException: Error invoking java.lang.reflect.Executable#getAnnotatedParameterTypes

org.mockito.exceptions.base.MockitoException: 
Mockito cannot mock this class: interface com.lmax.monitoring.MetricPublisher.

Mockito can only mock non-private & non-final classes.
If you're not sure why you're getting this error, please report to the mailing list.


Java               : 1.8
JVM vendor name    : Oracle Corporation
JVM vendor version : 25.172-b11
JVM name           : Java HotSpot(TM) 64-Bit Server VM
JVM version        : 1.8.0_172-b11
JVM info           : mixed mode
OS name            : Linux
OS version         : 4.17.7-200.fc28.x86_64


Underlying exception : java.lang.IllegalStateException: Error invoking java.lang.reflect.Executable#getAnnotatedParameterTypes
	at com.lmax.adminauthenticator.AdminAuthenticatorTest.setUp(AdminAuthenticatorTest.java:57)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
	at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:24)
	at com.facebook.buck.testrunner.SameThreadFailOnTimeout.lambda$new$0(SameThreadFailOnTimeout.java:43)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.IllegalStateException: Error invoking java.lang.reflect.Executable#getAnnotatedParameterTypes
	at net.bytebuddy.description.type.TypeDescription$Generic$AnnotationReader$Dispatcher$ForJava8CapableVm$AnnotatedParameterizedType.resolve(TypeDescription.java:2653)
	at net.bytebuddy.description.type.TypeDescription$Generic$AnnotationReader$Delegator.asList(TypeDescription.java:2822)
	at net.bytebuddy.description.type.TypeDescription$Generic$OfNonGenericType$ForLoadedType.getDeclaredAnnotations(TypeDescription.java:3450)
	at net.bytebuddy.implementation.attribute.AnnotationAppender$ForTypeAnnotations.apply(AnnotationAppender.java:639)
	at net.bytebuddy.implementation.attribute.AnnotationAppender$ForTypeAnnotations.onNonGenericType(AnnotationAppender.java:620)
	at net.bytebuddy.implementation.attribute.AnnotationAppender$ForTypeAnnotations.onNonGenericType(AnnotationAppender.java:333)
	at net.bytebuddy.description.type.TypeDescription$Generic$OfNonGenericType.accept(TypeDescription.java:3270)
	at net.bytebuddy.implementation.attribute.MethodAttributeAppender$ForInstrumentedMethod.apply(MethodAttributeAppender.java:183)
	at net.bytebuddy.implementation.attribute.MethodAttributeAppender$Compound.apply(MethodAttributeAppender.java:425)
	at net.bytebuddy.dynamic.scaffold.TypeWriter$MethodPool$Record$ForDefinedMethod$WithBody.applyAttributes(TypeWriter.java:617)
	at net.bytebuddy.dynamic.scaffold.TypeWriter$MethodPool$Record$ForDefinedMethod$WithBody.applyBody(TypeWriter.java:609)
	at net.bytebuddy.dynamic.scaffold.TypeWriter$MethodPool$Record$ForDefinedMethod.apply(TypeWriter.java:528)
	at net.bytebuddy.dynamic.scaffold.TypeWriter$Default$ForCreation.create(TypeWriter.java:4167)
	at net.bytebuddy.dynamic.scaffold.TypeWriter$Default.make(TypeWriter.java:1653)
	at net.bytebuddy.dynamic.scaffold.subclass.SubclassDynamicTypeBuilder.make(SubclassDynamicTypeBuilder.java:183)
	at net.bytebuddy.dynamic.scaffold.subclass.SubclassDynamicTypeBuilder.make(SubclassDynamicTypeBuilder.java:163)
	at net.bytebuddy.dynamic.DynamicType$Builder$AbstractBase.make(DynamicType.java:2669)
	at net.bytebuddy.dynamic.DynamicType$Builder$AbstractBase$Delegator.make(DynamicType.java:2771)
	at org.mockito.internal.creation.bytebuddy.SubclassBytecodeGenerator.mockClass(SubclassBytecodeGenerator.java:128)
	at org.mockito.internal.creation.bytebuddy.TypeCachingBytecodeGenerator$1.call(TypeCachingBytecodeGenerator.java:37)
	at org.mockito.internal.creation.bytebuddy.TypeCachingBytecodeGenerator$1.call(TypeCachingBytecodeGenerator.java:34)
	at net.bytebuddy.TypeCache.findOrInsert(TypeCache.java:137)
	at net.bytebuddy.TypeCache$WithInlineExpunction.findOrInsert(TypeCache.java:344)
	at net.bytebuddy.TypeCache.findOrInsert(TypeCache.java:159)
	at net.bytebuddy.TypeCache$WithInlineExpunction.findOrInsert(TypeCache.java:353)
	at org.mockito.internal.creation.bytebuddy.TypeCachingBytecodeGenerator.mockClass(TypeCachingBytecodeGenerator.java:32)
	at org.mockito.internal.creation.bytebuddy.SubclassByteBuddyMockMaker.createMockType(SubclassByteBuddyMockMaker.java:71)
	at org.mockito.internal.creation.bytebuddy.SubclassByteBuddyMockMaker.createMock(SubclassByteBuddyMockMaker.java:42)
	at org.mockito.internal.creation.bytebuddy.ByteBuddyMockMaker.createMock(ByteBuddyMockMaker.java:25)
	at org.mockito.internal.util.MockUtil.createMock(MockUtil.java:35)
	at org.mockito.internal.MockitoCore.mock(MockitoCore.java:68)
	at org.mockito.Mockito.mock(Mockito.java:1895)
	at org.mockito.Mockito.mock(Mockito.java:1804)
	... 14 more
Caused by: java.lang.NullPointerException
	at sun.reflect.annotation.TypeAnnotationParser.mapTypeAnnotations(TypeAnnotationParser.java:356)
	at sun.reflect.annotation.AnnotatedTypeFactory$AnnotatedTypeBaseImpl.<init>(AnnotatedTypeFactory.java:139)
	at sun.reflect.annotation.AnnotatedTypeFactory.buildAnnotatedType(AnnotatedTypeFactory.java:65)
	at sun.reflect.annotation.TypeAnnotationParser.buildAnnotatedTypes(TypeAnnotationParser.java:137)
	at java.lang.reflect.Executable.getAnnotatedParameterTypes(Executable.java:688)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at net.bytebuddy.description.type.TypeDescription$Generic$AnnotationReader$Dispatcher$ForJava8CapableVm$AnnotatedParameterizedType.resolve(TypeDescription.java:2649)
	... 46 more

Definition of MetricPublisher:

public interface MetricPublisher
{
    void publishMetric(String type, String name, double value, MetricType metricType);
    void publishMetric(String type, String name, double value, long timestamp, MetricType metricType);
    void endOfBatch();

    enum MetricType
    {
        COUNTER,
        TIMING,
        GAUGE,
        PERCENTAGE
    }
}

[mikeb01]

Is caused by this JDK bug (https://bugs.openjdk.java.net/browse/JDK-8152174). Which looks like it hasn’t had a fix back ported to JDK 8. I’ve worked around it by finding the missing classes.

[zugzug90]

Hi, @mikeb01 . Could you please provide more details and code helping to reproduce this issue?

I tried simple maven project with 2.20.1 and all seems working fine.

Here’s my pom.xml file:

<?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.room606.mocks</groupId>
    <artifactId>test-mocks-project</artifactId>
    <version>1.0-SNAPSHOT</version>

    <name>test-mocks-project</name>
    <!-- FIXME change it to the project's website -->
    <url>http://www.example.com</url>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
    </properties>

    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.11</version>
            <scope>test</scope>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.mockito/mockito-core -->
        <dependency>
            <groupId>org.mockito</groupId>
            <artifactId>mockito-core</artifactId>
            <version>2.20.1</version>
            <scope>test</scope>
        </dependency>

    </dependencies>

    <build>
        <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
            <plugins>
                <plugin>
                    <artifactId>maven-clean-plugin</artifactId>
                    <version>3.0.0</version>
                </plugin>
                <!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_jar_packaging -->
                <plugin>
                    <artifactId>maven-resources-plugin</artifactId>
                    <version>3.0.2</version>
                </plugin>
                <plugin>
                    <artifactId>maven-compiler-plugin</artifactId>
                    <version>3.7.0</version>
                </plugin>
                <plugin>
                    <artifactId>maven-surefire-plugin</artifactId>
                    <version>2.20.1</version>
                </plugin>
                <plugin>
                    <artifactId>maven-jar-plugin</artifactId>
                    <version>3.0.2</version>
                </plugin>
                <plugin>
                    <artifactId>maven-install-plugin</artifactId>
                    <version>2.5.2</version>
                </plugin>
                <plugin>
                    <artifactId>maven-deploy-plugin</artifactId>
                    <version>2.8.2</version>
                </plugin>
            </plugins>
        </pluginManagement>
    </build>
</project>

And here is my JUnit Test class:

package com.room606.mocks;

import static org.junit.Assert.assertTrue;
import static org.mockito.Mockito.mock;

import org.junit.Before;
import org.junit.Test;

public class AppTest {

    @Before
    public void setUp() {
        MetricPublisher metricPublisher = mock(MetricPublisher.class);
        metricPublisher.publishMetric("type", "name", 0.27d, MetricPublisher.MetricType.COUNTER);
        metricPublisher.endOfBatch();
    }

    @Test
    public void shouldAnswerWithTrue() {
        MetricPublisher metricPublisher = mock(MetricPublisher.class);
        metricPublisher.endOfBatch();
        metricPublisher.publishMetric("type", "name", 0.27d, MetricPublisher.MetricType.TIMING);
        assertTrue( true );
    }
}

Here’s the MetricPublisher interface code:

package com.room606.mocks;

public interface MetricPublisher {
    void publishMetric(String type, String name, double value, MetricType metricType);
    void publishMetric(String type, String name, double value, long timestamp, MetricType metricType);
    void endOfBatch();

    enum MetricType {
        COUNTER,
        TIMING,
        GAUGE,
        PERCENTAGE
    }
}

Thanks in advance.