MockClassLoader cannot access jdk/internal/reflect superclass jdk.internal.reflect.MagicAccessorImpl

Question

I am in the middle of migrating a project into Java9, The Tests start failing after I switched to the new Java version, it seems like PowerMock is trying to access some classes it does not have access to.

Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 0.973 sec <<< FAILURE! - in com.Test
initializationError(com.Test)  Time elapsed: 0.007 sec  <<< ERROR!
org.objenesis.ObjenesisException: java.lang.reflect.InvocationTargetException
Caused by: java.lang.reflect.InvocationTargetException
Caused by: java.lang.IllegalAccessError: class jdk.internal.reflect.ConstructorAccessorImpl loaded by org/powermock/core/classloader/MockClassLoader cannot access jdk/internal/reflect superclass jdk.internal.reflect.MagicAccessorImpl

maven-surefire-plugin

<plugin>
    <artifactId>maven-surefire-plugin</artifactId>
    <version>2.19.1</version>
    <configuration>
        <includes>
            <include>**/*Test.java</include>
            <include>**/*Test.groovy</include>
            <include>**/*Spec.*</include>
        </includes>
        <forkMode>always</forkMode>
        <argLine>--add-modules java.xml.bind</argLine>
        <argLine>--add-modules java.activation</argLine>
        <argLine>--add-opens=java.base/java.lang=ALL-UNNAMED --illegal-access=warn</argLine>
    </configuration>
</plugin>

powermock dependency

<dependency>
        <groupId>org.powermock</groupId>
        <artifactId>powermock-module-junit4</artifactId>
        <version>1.7.4</version>
        <scope>test</scope>
    </dependency>

    <dependency>
        <groupId>org.powermock</groupId>
        <artifactId>powermock-api-mockito</artifactId>
        <version>1.7.4</version>
        <scope>test</scope>
        <exclusions>
            <exclusion>
                <groupId>org.mockito</groupId>
                <artifactId>mockito-all</artifactId>
            </exclusion>
        </exclusions>
    </dependency>

Answer 1

I had a test dependency on a third-party jar which used powermock. In order to resolve this error, I had to add:

@PowerMockIgnore("jdk.internal.reflect.*")

To the class that is tested with powermock

Answer 2

It is an (currently) open issue @powermock, but for Java 9 this should work:

<dependency>
  <groupId>org.mockito</groupId>
  <artifactId>mockito-core</artifactId>
  <version>2.18.0</version> <!-- or higher, correspondning to powermock-version -->
</dependency>
<dependency>
  <groupId>org.powermock</groupId>
  <artifactId>powermock-api-mockito2</artifactId>
  <version>2.0.0-beta.5</version> <!-- or higher -->
</dependency>
<dependency>
  <groupId>org.powermock</groupId>
  <artifactId>powermock-module-junit4</artifactId>
  <version>2.0.0-beta.5</version> <!-- or higher -->
</dependency>

See: https://github.com/powermock/powermock/issues/901#issuecomment-385533096

---

With Java 11, Mosheer-Ahmad managed to run his tests, with:

1. the above dependencies,
2. an additional dependency on org.javassist javassist 3.24.1-GA testand

3. this (test base) class/annotations:

   @RunWith(PowerMockRunner.class)
   @PowerMockIgnore({"javax.management.", "com.sun.org.apache.xerces.", 
     "javax.xml.", "org.xml.", "org.w3c.dom.",
     "com.sun.org.apache.xalan.", "javax.activation.*"})
   public class PowerMockitoBaseRunner {
   
   }
   

   .

Answer 3

Just to re-iterate the very good point made by sghaier ali.

Adding * to the ignored classes solved the issue.

changes done are:

• The following dependencies in build.gradle:

  testImplementation 'org.mockito:mockito-core:3.3.3'
  testImplementation 'org.powermock:powermock-api-mockito2:2.0.5'
  testImplementation 'org.powermock:powermock-module-junit4:2.0.5'
  

• annotating the specific class with:

  @PowerMockIgnore({"javax.management.*", "com.sun.org.apache.xerces.*", "javax.xml.*",
      "org.xml.*", "org.w3c.dom.*", "com.sun.org.apache.xalan.*", "javax.activation.*"})