Correct set of dependencies for using Jackson mapper

Question

I am new to Jackson and I was writing some code for practice. I found out the the new version of Jackson library can be found on Fasterxml: Jackson, so I added the below dependencies to my Maven pom file:

<dependency>     <groupId>com.fasterxml.jackson.core</groupId>     <artifactId>jackson-annotations</artifactId>     <version>2.2.2</version> </dependency> <dependency>     <groupId>com.fasterxml.jackson.core</groupId>     <artifactId>jackson-core</artifactId>     <version>2.2.2</version> </dependency> <dependency>     <groupId>com.fasterxml.jackson.core</groupId>     <artifactId>jackson-databind</artifactId>     <version>2.2.2</version> </dependency> 

I was expecting that I can use the ObjectMapper directly, however after spending a lot of time I found out that to use the ObjectMapper I have to add the old libraries below:

<dependency>     <groupId>org.codehaus.jackson</groupId>     <artifactId>jackson-mapper-asl</artifactId>     <version>1.9.2</version> </dependency> <dependency>     <groupId>org.codehaus.jackson</groupId>     <artifactId>jackson-core-asl</artifactId>     <version>1.9.2</version> </dependency> 

I am a bit confused. Could someone please tell me why is that?

Answer 1

<properties>   <!-- Use the latest version whenever possible. -->   <jackson.version>2.4.4</jackson.version> </properties> <dependencies>    <dependency>     <groupId>com.fasterxml.jackson.core</groupId>     <artifactId>jackson-databind</artifactId>     <version>${jackson.version}</version>   </dependency> </dependencies> 

you have a ObjectMapper (from Jackson Databind package) handy. if so, you can do:

JsonFactory factory = objectMapper.getFactory(); 

Source: https://github.com/FasterXML/jackson-core

So, the 3 "fasterxml" dependencies which you already have in u'r pom are enough for ObjectMapper as it includes jackson-databind.

Answer 2

No, you can simply use com.fasterxml.jackson.databind.ObjectMapper. Most likely you forgot to fix your import-statements, delete all references to codehaus and you're golden.