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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
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The simple readValue API of the ObjectMapper is a good entry point. We can use it to parse or deserialize JSON content into a Java object. Also, on the writing side, we can use the writeValue API to serialize any Java object as JSON output.
The Jackon ObjectMapper is thread-safe so it can safely be reused.
The Jackson ObjectMapper can parse JSON from a string, stream or file, and create a Java object or object graph representing the parsed JSON. Parsing JSON into Java objects is also referred to as to deserialize Java objects from JSON. The Jackson ObjectMapper can also create JSON from Java objects.
Overview. When using JSON format, Spring Boot will use an ObjectMapper instance to serialize responses and deserialize requests. In this tutorial, we'll take a look at the most common ways to configure the serialization and deserialization options. To learn more about Jackson, be sure to check out our Jackson tutorial.
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.
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