java.lang.LinkageError: 加载器约束冲突 尝试使用 Mockito 参数匹配器时

Question

我正在尝试测试一个类，我有自己的参数Mathcher来匹配参数。这是代码：

@Test
public void testDoBindModelsToForm()
{
OrganizationToRelatedSubregionsConverter organizationToRelatedSubregionsConverter = mock(OrganizationToRelatedSubregionsConverter.class);
List<Organization> subregion1 = new ArrayList<Organization>();
Organization subregionOrg1 = CommonentityFactory.eINSTANCE.createOrganization();
subregionOrg1.setMID(OrganizationMID.create(DOMAIN, 100L));
subregionOrg1.setNameFormatted("Subregion 1"); //$NON-NLS-1$
subregion1.add(subregionOrg1);
when(
organizationToRelatedSubregionsConverter.convert(Matchers
.argThat(new OrganizationMIDMatcher(catchmentArea1.getMID())))).thenReturn(
subregion1);
CatchmentFormController catchmentFormController = new CatchmentFormController(
catchmentForm, DOMAIN, conversationDescriptor, configuration, registrationManager,
catchment, null, LaunchMode.ADD, organizationToRelatedSubregionsConverter);
catchmentFormController.renderDynamicForm();
organizationToRelatedSubregionsConverter.convert(catchmentArea1.getMID());
}

这是我的自定义匹配器类：

static class OrganizationMIDMatcher extends ArgumentMatcher<OrganizationMID>
{
private OrganizationMID expectedOrganizationMID;
public OrganizationMIDMatcher(OrganizationMID expectedOrganizationMID)
{
this.expectedOrganizationMID = expectedOrganizationMID;
}
@Override
public boolean matches(Object argument)
{
if (argument != null && argument instanceof OrganizationMID)
{
OrganizationMID actualOrganization = (OrganizationMID) argument;
return actualOrganization.equals(expectedOrganizationMID);
}
return false;
}
}

当我运行测试时，出现以下错误。我正在使用的 Mockito 依赖项是 Mockito-all 1.8.5。

> java.lang.LinkageError: loader constraint violation:
when resolving method "org.mockito.Matchers.argThat(Lorg/hamcrest/Matcher;)Ljava/lang/Object;" 
the class loader (instance of org/eclipse/osgi/internal/baseadaptor/DefaultClassLoader)
of the current class, com/cerner/registration/ui/internal/converters/OrganizationToRelatedSubregionsConverterTest,
and the class loader
(instance of org/eclipse/osgi/internal/baseadaptor/DefaultClassLoader) for resolved class,
org/mockito/Matchers, have different Class objects for the type org/hamcrest/Matcher used in the signature

知道这里可能有什么问题吗？

Answer 1

> 您不应该将mockito-all与junit4.8.2-v370一起使用。两者都包含hamcrest依赖关系，并且由于它们在OSGi环境中使用不同的类加载器，因此这些类将不兼容。作为一种解决方法，您应该考虑使用mockito-core(如果要使用相同的版本，则1.8.5)和至少4.9版本的junit(他们开始正确捆绑hamcrest：作为依赖项)。

或者 - 不遵循 - 您可以"分叉"junit的4.8.2版本，并在没有hamcrest类的情况下重新打包它。