Cannot work with Jackson

Question

I am wondering why there is not a determined way to work with Jackson. I just want to parse JSON string:

ObjectMapper mapper = new ObjectMapper();
Customer[] myObjects = mapper.readValue(file, Customer[].class);

But I really confused what should I import to do that. According to this link, I tried to import mapper-asl.jar. But I get this compile error:

The type org.codehaus.jackson.JsonParser cannot be resolved. It is indirectly referenced from required .class files

Then I try to import jackson-core-2.4.2 and jackson-databind-2.4.2. So there was no compile error but I got this runtime exception instead (in mapper definition line):

java.lang.NoClassDefFoundError: com.fasterxml.jackson.annotation.JsonAutoDetect

Guide me please what should I import to work with Jackson. Thanks

As others point out, you have some version mixup: `org.codehaus.jackson` is for Jackson 1.x, and `com.fasterxml.jackson` for 2.x. And something else you have is depending on Jackson 1.x (probably 1.9, Hadoop, DropWizard or Jersey maybe?) — StaxMan, Sep 24 '14 at 21:08
No the problem is solved. Just I should add `jackson-annotation` library. Thanks. — Misagh Emamverdi, Sep 24 '14 at 21:12
After adding jackson-annotation, do we have to import any class file ? — Sangram Anand, Nov 22 '15 at 16:15

Kumar · Accepted Answer · 2018-03-14T12:03:57.210

15

use these dependencies jackson-databind
jackson-annotations
jackson-core

public class JsonTest {
    public static void main(String[] args) throws JsonProcessingException {
    ObjectMapper mapper=new ObjectMapper();
    Map<String,String> dt=new Hashtable();
    dt.put("1", "welcome");
    dt.put("2", "bye");
    String jsonString = mapper.writeValueAsString(dt)
    System.out.println(jsonString);
    }    
}

edited Mar 14 '18 at 12:03

answered Sep 20 '14 at 09:48

Kumar

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2

It worked just after I added jackson-annotations. Thanks – Misagh Emamverdi Sep 20 '14 at 19:10
1

Thanks, I've just added jackson-databind as maven dependency and my projects works. Cheers – netto Sep 30 '16 at 00:59

score 4 · Answer 2 · answered Sep 20 '14 at 09:23

Looks like mixed up references.

You might be using a library that uses an old version of Jackson itself (i.e. the org.codehaus package)...

I usually just reference Jackson through Maven.

Something like:

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

Cannot work with Jackson

2 Answers2

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