Mockito fails to mock non-public inner class in continuous testing due to classloading issues #38987
Description
Describe the bug
The following primitive test (and tested class):
@ExtendWith(MockitoExtension.class)
public class FooTest {
@Mock
private Foo.Inner mock;
@Test
public void test() {
}
}public class Foo {
static class Inner {
}
}works fine in IDE or mvn, but fails with mvn quarkus:test:
ERROR [io.qua.test] (Test runner thread) Test FooTest#test() failed
: org.mockito.exceptions.base.MockitoException:
Mockito cannot mock this class: class org.acme.Foo$Inner.
Mockito can only mock non-private & non-final classes, but the root cause of this error might be different.
Please check the full stacktrace to understand what the issue is.
If you're still not sure why you're getting this error, please open an issue on GitHub.
Java : 17
JVM vendor name : Azul Systems, Inc.
JVM vendor version : 17.0.9+8-LTS
JVM name : OpenJDK 64-Bit Server VM
JVM version : 17.0.9+8-LTS
JVM info : mixed mode, emulated-client, sharing
OS name : Linux
OS version : 5.15.0-94-generic
Underlying exception : org.mockito.exceptions.base.MockitoException:
Cannot create mock for class org.acme.Foo$Inner
The type is not public and its mock class is loaded by a different class loader.
This can have multiple reasons:
- You are mocking a class with additional interfaces of another class loader
- Mockito is loaded by a different class loader than the mocked type (e.g. with OSGi)
- The thread's context class loader is different than the mock's class loader
at org.mockito.junit.jupiter.MockitoExtension.beforeEach(MockitoExtension.java:160)
at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)
at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)
Suppressed: java.lang.NullPointerException: Cannot invoke "java.util.Set.forEach(java.util.function.Consumer)" because the return value of "org.junit.jupiter.api.extension.ExtensionContext$Store.remove(Object, java.lang.Class)" is null
at org.mockito.junit.jupiter.MockitoExtension.afterEach(MockitoExtension.java:194)
... 2 more
Caused by: org.mockito.exceptions.base.MockitoException:
Cannot create mock for class org.acme.Foo$Inner
The type is not public and its mock class is loaded by a different class loader.
This can have multiple reasons:
- You are mocking a class with additional interfaces of another class loader
- Mockito is loaded by a different class loader than the mocked type (e.g. with OSGi)
- The thread's context class loader is different than the mock's class loader
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)
... 3 more
ERROR [io.qua.test] (Test runner thread) >>>>>>>>>>>>>>>>>>>> Summary: <<<<<<<<<<<<<<<<<<<<
FooTest#test()
Expected behavior
No failure, should work as in IDE or mvn.
Actual behavior
Fails with classloading issue.
How to Reproduce?
- clone https://github.com/famod/q_ctest-inner
mvn clean verify(passes)mvn quarkus:testfails
Output of uname -a or ver
No response
Output of java -version
No response
Quarkus version or git rev
3.7.4
Build tool (ie. output of mvnw --version or gradlew --version)
No response
Additional information
The problem vanishes after adding public to the inner class.
I have another case where adding public helps, but that's not an inner class.
It has been an issue for many releases now, I just haven't found the time to report it.
I'm rather sure (IIRC) it was actually working some months ago.