Jackson Json and no such method errors

Question

I am trying to use jackson to serialize and deserialize a POJO. Going from POJO to JSON works perfectly but going the other direction does not.

I have a POJO

public class Event {
  private String kind;

  public String getKind() {
    return kind;
  }

  public void setKind(String kind) {
    this.kind = kind;
  }
}

and to run and test I run package calendar.model;

Event event = new Event();
event.setKind("This is a kind");
String json = objectMapper.writeValueAsString(event); 
// RETURNS: "{\"kind\":\"This is a kind\"}"

objectMapper.readValue(json, Event.class);

Throws Exception

java.lang.NoSuchMethodError: com.fasterxml.jackson.core.JsonParser.getValueAsString()Ljava/lang/String;
at com.fasterxml.jackson.databind.deser.std.StringDeserializer.deserialize(StringDeserializer.java:24)
at com.fasterxml.jackson.databind.deser.std.StringDeserializer.deserialize(StringDeserializer.java:11)
at com.fasterxml.jackson.databind.deser.SettableBeanProperty.deserialize(SettableBeanProperty.java:375)
at com.fasterxml.jackson.databind.deser.impl.MethodProperty.deserializeAndSet(MethodProperty.java:98)
at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:308)
at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:121)
at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:2796)
at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:1942)
at calendar.controller.RootController.details(RootController.java:59)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:219)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:100)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:604)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:565)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)

I have played with about all I can to get the JSON to POJO to work but it won't. It does work if I map from JSON to a Map type.

Thanks for the help

EDIT

here is a grep for jackson in my dependencies

± > mvn dependency:tree | grep jackson                                                                                                                       -I- 
[INFO] +- com.google.http-client:google-http-client-jackson2:jar:1.13.1-beta:compile
[INFO] |  \- com.fasterxml.jackson.core:jackson-core:jar:2.0.5:compile
[INFO] |  |  +- com.fasterxml.jackson.core:jackson-annotations:jar:2.1.1:compile
[INFO] |  |  +- com.fasterxml.jackson.dataformat:jackson-dataformat-xml:jar:2.1.1:compile
[INFO] |  |  |  +- com.fasterxml.jackson.core:jackson-databind:jar:2.1.1:compile
[INFO] |  |  |  +- com.fasterxml.jackson.module:jackson-module-jaxb-annotations:jar:2.1.0:compile

It looks like there is no other version of jackson except for jackson2.

The full method being run is a spring controller method.

@RequestMapping(value = "/")
  public Event root() throws IOException {
    Event event = new Event();
    event.setKind("This is a kind");
    String json = objectMapper.writeValueAsString(event);
    // RETURNS: "{\"kind\":\"This is a kind\"}"

    Event mapped = objectMapper.readValue(json, Event.class);
    return mapped;
  }

Your stacktrace indicates that your object is being serialized in a way other than what you showed in your question. Too me it looks like you have a different version of the core Jackson library in your classpath. Please post more representative code, and verify which Jackson JAR's are bundled together with your app. — Perception, Feb 16 '13 at 20:27
@Perception I edited the question, but there is really not more going on then what I gave before, if you can be more specific about what may help maybe I can give more info. — austinbv, Feb 16 '13 at 20:49

score 67 · Accepted Answer · answered Feb 16 '13 at 21:08

67

It looks like the problem is that you are getting incompatible versions of jackson-core and jackson-databind - jackson-core 2.0.5 is being pulled in, but I believe at least 2.1.0 is required.

The first line of the exception tells you that it can't find the method JsonParser.getValueAsString(), looking at the API docs for 2.0.5, that method indeed does not exist. It looks like it was added in 2.1.0.

So, you'll need to fix the dependencies - most likely by excluding 2.0.5 and including 2.1.0.

answered Feb 16 '13 at 21:08

Spencer Uresk

3,730
26
23

10

Instead of excluding, you could add a `` section that declares the appropriate versions. A bit more elegant than excludes. – Steven Schlansker Feb 16 '13 at 22:07
3

Flawless thank you guys, the easiest way was to add jackson-core 2.1.1 as an explicit dependency in my pom, if that is not the best way I let me know. – austinbv Feb 16 '13 at 22:27
If you download the AWS SDK for Java, get the latest version, and then `third-party` folder will contain important jars that you MUST include on your classpath (not just build path).... a little odd. – Don Cheadle Sep 19 '14 at 20:42
2

@austinbv thank you, when I used the latest version of jackson-core it fixes my problem: com.fasterxml.jackson.core jackson-core 2.7.5 – Chris Sim Jul 05 '16 at 09:05

Jackson Json and no such method errors

EDIT

1 Answers1

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