Spring4 MVC单元测试不编译 [英] Spring4 MVC Unit test does not compile

问题描述

在Spring 3.2.5→4.0.0版本更新后尝试编译源代码时，我遇到了一些奇怪的行为。

I have strange behaviour when trying to compile sources after Spring 3.2.5 → 4.0.0 version update.

来自的错误代码片段ApplicationControllerTest .java （它等同于来自文档）：

Faulty code snippet from ApplicationControllerTest.java (it is equivalent to code from documentation):

import org.springframework.test.context.web.WebAppConfiguration;
import org.springframework.test.web.servlet.MockMvc;
import org.springframework.test.web.servlet.setup.MockMvcBuilders;
import org.springframework.web.context.WebApplicationContext;
...
@Autowired
private WebApplicationContext wac;

private MockMvc               mockMvc;

@Before
public void setUp() {
    mockMvc = MockMvcBuilders.webAppContextSetup(wac).build();
}

错误：

COMPILATION ERROR：
/C:/Development/.../war/src/test/java/org/.../web/controller/ApplicationControllerTest.java:[59,61 ] C：\Development\ ... \war\src\test\java\org\ ... \web\controller\ApplicationControllerTest.java：59：不兼容的类型;推断类型参数java.lang.Object不符合类型变量的边界B
found：< B> org.springframework.test.web.servlet.setup.DefaultMockMvcBuilder< B>
必需：java.lang.Object

如果查看 MockMvcBuilders 源，可以看到区别：

If one looks into MockMvcBuilders sources, one can see the difference:

Spring 4.0.0：

Spring 4.0.0:

public static <B extends DefaultMockMvcBuilder<B>> DefaultMockMvcBuilder<B> webAppContextSetup(WebApplicationContext context) {
    return new DefaultMockMvcBuilder<B>(context);
}

Spring 3.2.5：

Spring 3.2.5:

public static DefaultMockMvcBuilder<DefaultMockMvcBuilder<?>> webAppContextSetup(WebApplicationContext context) {
    return new DefaultMockMvcBuilder<DefaultMockMvcBuilder<?>>(context);
}

我试图让它可编译没有成功。

My attempts to make it compilable did not succeeded.

其实 Spring文档说，框架应该是Java 1.6.0_10兼容。我使用Java 1.6.0_45。

Actually Spring documentation says that framework should be Java 1.6.0_10 compatible. I use Java 1.6.0_45.

推荐答案

我认为 webAppContextSetup 方法现在应该使用< B extends DefaultMockMvcBuilder< B>< / code>的类来显式地参数化。明显的候选者是 StandaloneMockMvcBuilder 或简单地 DefaultMockMvcBuilder （虽然后者将生成关于未选中或不安全操作的警告）。所以试试这个：

I think the call of webAppContextSetup method now should be explicitly parameterized with the class of <B extends DefaultMockMvcBuilder<B>>. The obvious candidates are StandaloneMockMvcBuilder or simply DefaultMockMvcBuilder (though the later will generate a warning about unchecked or unsafe operations). So try this:

mockMvc = MockMvcBuilders.<StandaloneMockMvcBuilder>webAppContextSetup(wac).build();

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