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When I execute mycode from intelliJ Idea it works fine but when I run the jar on my server it throws the below error. I am using 'org.mongodb:mongodb-driver:3.4.1' version.

 Exception in thread "main" java.lang.NoClassDefFoundError: org/bson/conversions/Bson
        at com.myapp.server.mongo.MongoDbHandler.prepareMongoDb(MongoDbHandler.java:68)
        at com.myapp.server.mongo.MongoDbHandler.<init>(MongoDbHandler.java:22)
        at com.myapp.server.Client.main(Client.java:167)
Caused by: java.lang.ClassNotFoundException: org.bson.conversions.Bson
        at java.net.URLClassLoader$1.run(URLClassLoader.java:372)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:360)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
        ... 3 more
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  • Could you please add more information? Are you referring to a web server or an application server or your mongo server? What Java version you are using? Is it a maven build? Do you have the same Java version on the server as on your intelliJ Idea? Commented Dec 1, 2016 at 14:11
  • Most probably a dependency issue. Would make sense to post a part of your pom.xml or build.gradle, or ivy.xml, or wherever you define the dependencies. Commented Dec 1, 2016 at 14:13
  • i am using build.gradle with server java 1.8 version and intellij with 1.7 java version Commented Dec 1, 2016 at 14:21
  • put " compile group: 'org.mongodb', name: 'bson', version: '2.5.1' " under dependancies in your gradle build file; sounds like that'll fix you up Commented Dec 1, 2016 at 14:23
  • @Hans i just tried with your solution with bson version 2.5.1 but getting error as Exception in thread "main" java.lang.NoClassDefFoundError: org/bson/conversions/Bson Commented Dec 1, 2016 at 14:28

2 Answers 2

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I know its an old thread and its just for those who have the similar issues. Few days back I was also facing the same issue with same error trace while running the jar by command line.After rechecking the code found that

It was not a problem of the jar version but its problem of the packaging of the jar

After packing the jar with all proper dependencies will solve this issue.

I have used

maven-assembly-plugin

for packaging and its works.

.

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If I had to guess you need to get yourself whatever BSON library you're using; I wouldn't say that Mongo is your problem.

key line here is: "Caused by: java.lang.ClassNotFoundException: org.bson.conversions.Bson"

So it's saying that it's not finding that particular class, I would look in IntelliJ and see what BSON library it is, then put it in your build directory (or java lib) on your server.

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3 Comments

i tried this solution earlier with different version of bson library but i am getting same result. i have updated my mongo library from 2.10.0 to 3.4.0 then i am facing this issue
you shouldn't have to change the version, it's probably a case of not being in the directory you/java think it should be. The easiest way to check would be to put it in the same directory as your jar and import <insert file name here of bson library> (ie import bson3.2.1; exclude the file extension) that should let you see if it's a path issue.
but from 2.10.0 version few methods are get deprecated so i updated with recent version 3.4.0

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