atmosphere-samples-master/samples/spring-boot-sample-atmosphere doesn't work

[simbo1905]

Downloading the github zip link this hour then trying to run the latest chat app with

cd atmosphere-samples-master/samples/spring-boot-sample-atmosphere
mvn package spring-boot:run

does not start giving error

[INFO] Attaching agents: []
Listening for transport dt_socket at address: 9009
Exception in thread "main" java.lang.NoSuchMethodError: org.springframework.core.ResolvableType.forInstance(Ljava/lang/Object;)Lorg/springframework/core/ResolvableType;
    at org.springframework.context.event.SimpleApplicationEventMulticaster.resolveDefaultEventType(SimpleApplicationEventMulticaster.java:142)
    at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:119)
    at org.springframework.boot.context.event.EventPublishingRunListener.publishEvent(EventPublishingRunListener.java:100)
    at org.springframework.boot.context.event.EventPublishingRunListener.started(EventPublishingRunListener.java:54)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:277)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:957)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:946)
    at org.atmosphere.samples.springboot.AtmosphereApplication.main(AtmosphereApplication.java:80)

I am running with JDK 1.8.0_60 and latest maven 3.3.3:

Pro:spring-boot-sample-atmosphere simbo$ mvn -version
Apache Maven 3.3.3 (7994120775791599e205a5524ec3e0dfe41d4a06; 2015-04-22T12:57:37+01:00)
Maven home: /usr/local/Cellar/maven333
Java version: 1.8.0_60, vendor: Oracle Corporation
Java home: /Library/Java/JavaVirtualMachines/jdk1.8.0_60.jdk/Contents/Home/jre
Default locale: en_US, platform encoding: UTF-8
OS name: "mac os x", version: "10.11", arch: "x86_64", family: "mac"
Pro:spring-boot-sample-atmosphere simbo$