java.lang.NoClassDefFoundError: com/fasterxml/jackson/annotation/JsonMerge

Run a Jackson related project and hits the following JsonMerge not found error.

Console

java.lang.NoClassDefFoundError: com/fasterxml/jackson/annotation/JsonMerge
	at com.fasterxml.jackson.databind.introspect.JacksonAnnotationIntrospector.<clinit>(JacksonAnnotationIntrospector.java:50) ~[jackson-databind-2.9.0.pr1.jar:2.9.0.pr1]
	at com.fasterxml.jackson.databind.ObjectMapper.<clinit>(ObjectMapper.java:292) ~[jackson-databind-2.9.0.pr1.jar:2.9.0.pr1]
	at com.hostingcompass.core.utils.PrintUtils.<clinit>(PrintUtils.java:9) ~[main/:na]
	at com.hostingcompass.app.run.TurtleApp.run(TurtleApp.java:25) ~[main/:na]
	at com.hostingcompass.app.Main.run(Main.java:42) [main/:na]
	at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:776) [spring-boot-1.5.2.RELEASE.jar:1.5.2.RELEASE]
	at org.springframework.boot.SpringApplication.callRunners(SpringApplication.java:760) [spring-boot-1.5.2.RELEASE.jar:1.5.2.RELEASE]
	at org.springframework.boot.SpringApplication.afterRefresh(SpringApplication.java:747) [spring-boot-1.5.2.RELEASE.jar:1.5.2.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) [spring-boot-1.5.2.RELEASE.jar:1.5.2.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1162) [spring-boot-1.5.2.RELEASE.jar:1.5.2.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1151) [spring-boot-1.5.2.RELEASE.jar:1.5.2.RELEASE]
	at com.hostingcompass.app.Main.main(Main.java:34) [main/:na]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_77]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_77]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_77]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_77]
	at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147) [idea_rt.jar:na]
Caused by: java.lang.ClassNotFoundException: com.fasterxml.jackson.annotation.JsonMerge
	at java.net.URLClassLoader.findClass(URLClassLoader.java:381) ~[na:1.8.0_77]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[na:1.8.0_77]
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331) ~[na:1.8.0_77]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[na:1.8.0_77]
	... 17 common frames omitted

Solution

Note
Review the error message above, the project is using jackson-databind-2.9.0.pr1

To fix it, downgrade Jackson to version 2.8.x, the latest 2.9.0.pr1 is not stable yet. For Gradle, uses dependencyInsight to find out the jackson-databind relationship.

Terminal

$ gradle dependencyInsight --configuration compile --dependency jackson-databind

com.fasterxml.jackson.core:jackson-databind:2.9.0.pr1 (conflict resolution)

com.fasterxml.jackson.core:jackson-databind:2.8.2 -> 2.9.0.pr1
\--- com.maxmind.geoip2:geoip2:2.8.0
     \--- compile

com.fasterxml.jackson.core:jackson-databind:2.8.7 -> 2.9.0.pr1
\--- compile

com.fasterxml.jackson.core:jackson-databind:[2.7.0,) -> 2.9.0.pr1
\--- com.maxmind.db:maxmind-db:1.2.1
     \--- com.maxmind.geoip2:geoip2:2.8.0
          \--- compile

To fix it, exclude the jackson-databind from com.maxmind.geoip2 :

build.gradle

dependencies {
    compile "com.fasterxml.jackson.core:jackson-databind:2.8.7"
    compile ('com.maxmind.geoip2:geoip2:2.8.0'){
        exclude group: 'com.fasterxml.jackson.core', module: 'jackson-databind'
    }
}

References

  1. ClassNotFoundException for JsonMerge #119
  2. Gradle – Display project dependency

About the Author

author image
mkyong
Founder of Mkyong.com, love Java and open source stuff. Follow him on Twitter. If you like my tutorials, consider make a donation to these charities.

Comments

avatar
2 Comment threads
0 Thread replies
0 Followers
 
Most reacted comment
Hottest comment thread
2 Comment authors
saurabh SinghVladimir Kotal Recent comment authors
newest oldest most voted
Vladimir Kotal
Guest
Vladimir Kotal

This problem can also happen if you have 2 dependencies such as org.glassfish.jersey.core version 2.27 and com.fasterxml.jackson.core 2.9.x. The former depends on jackson 2.8.10 and this will cause the JsonMerge not being found when e.g. converting object to JSON for RESTful API endpoint via Jersey.

saurabh Singh
Guest
saurabh Singh

either you can downgrade or you can upgrade jars (jackson-core and jackson-annotation) to match with databind jar version