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:

Answer 1

I have faced this problem when migrating my WebApp from Tomcat 6 to Tomcat 8. On Tomcat6 and Tomcat7 my WebApp would start just fine, but on Tomcat8 I would get this exception(seems that T6 and T7 loads classes alphabeticaly but T8 doesn't - https://stackoverflow.com/a/26642798/1864614).

The problem was that I was having 2 versions of the class

org.codehaus.jackson.map.ObjectMapper

As answered by @wild_nothing I have checked dependency the tree to list all dependencies on org.codehaus.jackson

In my case the problem was that I had several versions of libraries that provided this class:

• org.codehaus.jackson:jackson-mapper-lgpl:jar:1.5.0
• org.codehaus.jackson:jackson-core-lgpl:jar:1.5.0
• org.codehaus.jackson:jackson-mapper-asl:jar:1.8.2
• org.codehaus.jackson:jackson-core-asl:jar:1.8.2

My solution was to exclude the older versions(1.5.0) and only leave the 1.8.2 version

        cfm.foo
        jive
        
            
                org.codehaus.jackson
                jackson-core-lgpl
            
            
                org.codehaus.jackson
                jackson-mapper-lgpl
            
        
    

• in this case jive was depending on older 1.5.0 version