EasyMock / Bugs / #17 IllegalAccessError for Package-Scope-Interfaces

Henri Tremblay - 2009-03-28

I'm not sure how you did that. I made a little test. The mocked interface is package scope. The test is in the same package. I pass nicely.

interface IElementCleanup {
public boolean createCleanup();
}

public class ModelCleanup {
void cleanupAndValidate(IElementCleanup e) {
e.createCleanup();
}
}

public class PackageScope {
@Test
public void test_validateAndCleanup() {
IElementCleanup i = createMock(IElementCleanup.class);
expect(i.createCleanup()).andReturn(true);
replay(i);

ModelCleanup c = new ModelCleanup(); c.cleanupAndValidate(i); verify(i); }

}

Can you show me how to make this test case fail?
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Virtualwarp - 2009-03-30

Sorry for the incorrect posting, i missed that the exeception occurs only with together with andReturn. Here is an testcase which should be green:

package de.testpackage;

import static org.easymock.EasyMock.*;
import junit.framework.TestCase;

import org.easymock.IMocksControl;
import org.junit.Test;

public class FactoryMockTest extends TestCase {
public static interface IFactory {
void call(IPackagePrivate packagePrivateCall);

void call(IPublic publicCall); IPackagePrivate createPackagePrivate(); IPublic createPublic();

}

public static interface IPublic {

public void call();

}

static interface IPackagePrivate {

public void call();

}

@Test
public void test_call_ok() {
IMocksControl control = createStrictControl();
IPackagePrivate packagePrivateMock = control.createMock(IPackagePrivate.class);
IPublic publicMock = control.createMock(IPublic.class);
IFactory factoryMock = control.createMock(IFactory.class);

expect(factoryMock.createPublic()).andReturn(publicMock); factoryMock.call(publicMock); factoryMock.call(packagePrivateMock); control.replay(); assertEquals(publicMock, factoryMock.createPublic()); factoryMock.call(publicMock); factoryMock.call(packagePrivateMock); control.verify();

}

@Test
public void test_call_fails() {
IMocksControl control = createStrictControl();
IPackagePrivate packagePrivateMock = control.createMock(IPackagePrivate.class);
IFactory factoryMock = control.createMock(IFactory.class);

expect(factoryMock.createPackagePrivate()).andReturn(packagePrivateMock); control.replay(); assertEquals(packagePrivateMock, factoryMock.createPackagePrivate()); control.verify();

}
}
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This is tricky. It's a JDK problem. A proxy is created in the default package. So if you return a package scope interface from a proxy, you get this error. The case is quite rare, Things I can do:

1- Just have a nice error message about the limitation
2- Dynamically create and interface bytecode in the same package and package scope. Huge workaround to the JDK and a little bit complex for such a rare case
3- It's working with cglib so creating the new proxy factory would work. Like this:

public class MyMocksControl extends MocksControl {

private static final long serialVersionUID = 5066517411023500987L;

public MyMocksControl(MockType type) {
    super(type);
}

@SuppressWarnings("unchecked")
@Override
protected <T> IProxyFactory<T> createProxyFactory(Class<T> toMock) {
    return new IProxyFactory() {
        @Override
        public Object createProxy(Class toMock,
                final InvocationHandler handler) {
            return Enhancer.create(toMock,
                    new net.sf.cglib.proxy.InvocationHandler() {
                        @Override
                        public Object invoke(Object proxy, Method method,
                                Object[] args) throws Throwable {
                            return handler.invoke(proxy, method, args);
                        }

                    });
        }
    };
}

}

And the test:

@Test
public void testCglib() throws Exception {
    MyMocksControl c = new MyMocksControl(MockType.STRICT);
    IFactory f = c.createMock(IFactory.class);
    f.createPackagePrivate();
}

You can use this workaround. I'll try to fix this one but not in the next release.

IllegalAccessError for Package-Scope-Interfaces

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#17 IllegalAccessError for Package-Scope-Interfaces

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