英文:
Mockito: "Checked exception is invalid for this method" when throwing specified checked exception
问题
以下是翻译好的部分：
有关这个问题，在StackOverflow上有几个类似的问题，但我认为这种情况不同。我正在使用Java 11和Mockito 2.11.0。
这是一个演示我的问题的最小 JUnit 4 测试案例：
@Test
public void shouldAllowMocking() throws Exception {
ObjectMapper objectMapper = mock(ObjectMapper.class);
when(objectMapper.readValue(anyString(), any(Class.class))).thenThrow(new IOException("the-message"));
}
我正在模拟Jackson的ObjectMapper的readValue(String content, Class<T> valueType)方法的行为 - 文档在这里 - 并且文档显示该方法可以抛出IOException。那么为什么Mockito会报告我无法模拟抛出这种异常呢？
有趣的是，如果我将行为更改为抛出JsonParseException，这个方法也可以抛出，那么Mockito就不会抱怨。
英文:
There are several questions around this on StackOverflow, but I believe this case to be different. I'm using Java 11 and Mockito 2.11.0.
Here's a minimal JUnit 4 test case demonstrating my problem:
@Test
public void shouldAllowMocking() throws Exception {
ObjectMapper objectMapper = mock(ObjectMapper.class);
when(objectMapper.readValue(anyString(), any(Class.class))).thenThrow(new IOException("the-message"));
}
I'm mocking the behaviour of Jackson's ObjectMapper's readValue(String content, Class<T> valueType) method - documentation here - and the documentation shows that that method can throw an IOException. So why does Mockito report that it is invalid for me to mock throwing such an exception?
Interestingly, if I change the behaviour to throw a JsonParseException, which can also be thrown by that method, then Mockito doesn't complain.
答案1
得分: 4
自版本 2.10 起，Jackson 移除了 IOException，这是代码的一部分：
@SuppressWarnings("unchecked")
public <T> T readValue(String content, JavaType valueType)
throws JsonProcessingException, JsonMappingException
{
_assertNotNull("content", content);
try { // 自2.10版本开始，根据[databind#1675]移除了"impossible" IOException
return (T) _readMapAndClose(_jsonFactory.createParser(content), valueType);
} catch (JsonProcessingException e) {
throw e;
} catch (IOException e) { // 实际上不应该发生，但需要声明
throw JsonMappingException.fromUnexpectedIOE(e);
}
}
你提供的链接指向 jakson-databind 2.7，所以我假设你在查看错误的文档。
英文:
Since version 2.10 Jackson removed the IOException, this is the portion of the code:
@SuppressWarnings("unchecked")
public <T> T readValue(String content, JavaType valueType)
throws JsonProcessingException, JsonMappingException
{
_assertNotNull("content", content);
try { // since 2.10 remove "impossible" IOException as per [databind#1675]
return (T) _readMapAndClose(_jsonFactory.createParser(content), valueType);
} catch (JsonProcessingException e) {
throw e;
} catch (IOException e) { // shouldn't really happen but being declared need to
throw JsonMappingException.fromUnexpectedIOE(e);
}
}
The link you included in the question points to the jakson-databind 2.7 so I assume you are checking the wrong doc.
答案2
得分: 1
这是因为我无意中更新了我的jackson版本，较新的版本（2.11.x）不再抛出IOException。
英文:
This turns out to be because I'd unintentionally updated my jackson version as well, and the newer versions (2.11.x) don't throw IOException any more.
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