How do I fix a NoSuchMethodError?

Question

I\'m getting a NoSuchMethodError error when running my Java program. What\'s wrong and how do I fix it?

Answer 1

I had the same error:

  Exception in thread "main" java.lang.NoSuchMethodError: com.fasterxml.jackson.core.JsonGenerator.writeStartObject(Ljava/lang/Object;)V
        at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:151)
        at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider.serializeValue(DefaultSerializerProvider.java:292)
        at com.fasterxml.jackson.databind.ObjectMapper._configAndWriteValue(ObjectMapper.java:3681)
        at com.fasterxml.jackson.databind.ObjectMapper.writeValueAsString(ObjectMapper.java:3057)

To solve it I checked, firstly, Module Dependency Diagram (click in your POM the combination -> Ctrl+Alt+Shift+U or right click in your POM -> Maven -> Show dependencies) to understand where exactly was the conflict between libraries (Intelij IDEA). In my particular case, I had different versions of Jackson dependencies.

1) So, I added directly in my POM of the project explicitly the highest version - 2.8.7 of these two.

In properties:

2.8.7

And as dependency:

    com.fasterxml.jackson.core
    jackson-databind
    ${jackson.version}

2) But also it can be solved using Dependency Exclusions.

By the same principle as below in example:

  
      group-a
      artifact-a
      1.0
          
             
                com.fasterxml.jackson.core
                jackson-databind
             
         
  

Dependency with unwanted version will be excluded from your project.