ObjectMapper.readValue可以返回null值吗？

Question

ObjectMapper.readValue in Jackson library does return null value. In what case does it return null object? It found that from codebase.

<dependency>
    <groupId>org.codehaus.jackson</groupId>
    <artifactId>jackson-mapper-asl</artifactId>
    <version>1.9.9</version>
</dependency>

You can browse through ObjectMapper class to dig in more details

Answer 1

readValue() returns null for JSON input consisting of JSON value null . It does not return null for any other case: missing input (for example) would be rewarded by an exception; and no deserializer produces null by default.