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[Solved] java.lang.ClassNotFoundException: org.glassfish.jersey.servlet.ServletContainer

We can face this exception if we are setting up jersey 2 project first time in eclipse using the Maven plugin.

The error message is simple enough to identify the root cause that the Jersey libraries are not in classpath.

The Error

The exception will look like this.

SEVERE: Servlet /JerseyDemos threw load() exception
java.lang.ClassNotFoundException: org.glassfish.jersey.servlet.ServletContainer
	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1714)
	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1559)
	at org.apache.catalina.core.DefaultInstanceManager.loadClass(DefaultInstanceManager.java:532)
	at org.apache.catalina.core.DefaultInstanceManager.loadClassMaybePrivileged(DefaultInstanceManager.java:514)
	at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:133)
	at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1137)
	at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1081)
	at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:5027)
	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5314)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559)
	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549)
	at java.util.concurrent.FutureTask.run(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)

Solution – Add Jersey Library in Deployment Assembly

Open your project’s deployment assembly configuration.

Eclipse Deployment Assembly
Eclipse Deployment Assembly

Add Build path jar files in assembly so that they can be added to lib folder in the final .war file.

Deployment Assembly - Add Build Path Entries
Deployment Assembly – Add Build Path Entries

The updated assembly will look like this.

Deployment Assembly - Updated
Deployment Assembly – Updated

Now when you again run the project after building it, this will run fine and will be able to find org.glassfish.jersey.servlet.ServletContainer class.

Happy Learning !!

About Lokesh Gupta

A family guy with fun loving nature. Love computers, programming and solving everyday problems. Find me on Facebook and Twitter.

Feedback, Discussion and Comments

  1. raju

    Great, Its working for me. thanks

  2. Aidar

    how to fix this on Intellij IDEA

  3. sushma

    i am getting below issue

    org.glassfish.jersey.server.ContainerException: java.lang.NoClassDefFoundError: com/sun/jna/Pointer.

    Can any one help me with this?

    • Sunil sharma

      Please check with the servlet-name name and param-name in web.xml once.

  4. Pavan Segalla

    After 3 days finally, I was able to fix the issue with the help of this blog. Thanks a lot

  5. sandeep

    Thanks a lot…

  6. ranjit

    worked perfectly.

  7. Neha

    In my project maven dependencies are already added but still I am getting the issue .please help me in resolving this.

    • Paulo

      Do you remenber how you solved it?

  8. Sangeetha

    After wasting many hours in fixing this issue, finally I found this blog. Issue resolved. Thanks a lot.

  9. Monika

    Hi Lokesh, after clicking on next Java Build Path entries, there is nothing available and I am stuck there. Please do help.

  10. YassmeenSayed

    thanks a lot , this saved my sanity.

  11. Atula

    perfectly worked, thanks a lot, you help me save many hours 🙂

  12. Sandip

    Thanks a lot trying for a day .Now working perfectly.

  13. Sandeep

    Thanks a lot. Had been trying to solve this problem for half a day. Perfectly worked.

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