Jackson ObjectMapper() constructor throws NoSuchMethod

Question

I'm using Jackson sample code to deserialize a POJO:

ObjectMapper m = new ObjectMapper();

This line throws a NoSuchMethodError:

Exception in thread "main" java.lang.NoSuchMethodError: org.codehaus.jackson.type.JavaType.<init>(Ljava/lang/Class;)V
    at org.codehaus.jackson.map.type.TypeBase.<init>(TypeBase.java:15)
    at org.codehaus.jackson.map.type.SimpleType.<init>(SimpleType.java:45)
    at org.codehaus.jackson.map.type.SimpleType.<init>(SimpleType.java:40)
    at org.codehaus.jackson.map.type.TypeBindings.<clinit>(TypeBindings.java:18)
    at org.codehaus.jackson.map.type.TypeFactory._fromType(TypeFactory.java:525)
    at org.codehaus.jackson.map.type.TypeFactory.type(TypeFactory.java:61)
    at org.codehaus.jackson.map.ObjectMapper.<clinit>(ObjectMapper.java:179)
    at com.me.util.ctrl.BillingJobStatus.fromJson(BillingJobStatus.java:37)

I don't get it

Answer 1

I'm guessing your Jackson JARs are out of sync. The JavaType class is in the jackson-core JAR, and the ObjectMapper class is in jackson-mapper.

Make sure these are both of the same version.

Answer 2

I had this same problem. The core jar was 1.7.1 while the mapper was 1.8.1. Note: To fix this for maven I added an exclusion and pulled down the proper version.

        <exclusions>
            <exclusion>
                <groupId>org.codehaus.jackson</groupId>
                <artifactId>jackson-mapper-asl</artifactId>
            </exclusion>
        </exclusions>

Answer 3

The trick here is to exclude jackson from the dependencies that use it.

To check which dependencies import it, you can use the following maven command:

mvn dependency:tree -Dincludes=org.codehaus.jackson