DZone
Thanks for visiting DZone today,
Edit Profile
  • Manage Email Subscriptions
  • How to Post to DZone
  • Article Submission Guidelines
Sign Out View Profile
  • Post an Article
  • Manage My Drafts
Over 2 million developers have joined DZone.
Log In / Join
Refcards Trend Reports
Events Video Library
Refcards
Trend Reports

Events

View Events Video Library

Zones

Culture and Methodologies Agile Career Development Methodologies Team Management
Data Engineering AI/ML Big Data Data Databases IoT
Software Design and Architecture Cloud Architecture Containers Integration Microservices Performance Security
Coding Frameworks Java JavaScript Languages Tools
Testing, Deployment, and Maintenance Deployment DevOps and CI/CD Maintenance Monitoring and Observability Testing, Tools, and Frameworks
Culture and Methodologies
Agile Career Development Methodologies Team Management
Data Engineering
AI/ML Big Data Data Databases IoT
Software Design and Architecture
Cloud Architecture Containers Integration Microservices Performance Security
Coding
Frameworks Java JavaScript Languages Tools
Testing, Deployment, and Maintenance
Deployment DevOps and CI/CD Maintenance Monitoring and Observability Testing, Tools, and Frameworks

Related

  • How to Marry MDC With Spring Integration
  • How Spring and Hibernate Simplify Web and Database Management
  • Functional Endpoints: Alternative to Controllers in WebFlux
  • Graceful Shutdown: Spring Framework vs Golang Web Services

Trending

  • Serverless Machine Learning: Running AI Models Without Managing Infrastructure
  • Vibe Coding: Conversational Software Development — Part 1 Introduction
  • Streamlining DevOps: How Containers and Kubernetes Deliver
  • Threat Modeling for Developers: Identifying Security Risks in Software Projects
  1. DZone
  2. Coding
  3. Frameworks
  4. Solving Spring NoClassDefFoundError, ClassNotFoundException, and MethodNotFoundExceptions Errors

Solving Spring NoClassDefFoundError, ClassNotFoundException, and MethodNotFoundExceptions Errors

We take a look at some common Spring Boot questions when it comes to some popular exceptions. Read on to find out how to deal with them.

By 
Martin Farrell user avatar
Martin Farrell
·
Sep. 13, 16 · Tutorial
Likes (3)
Comment
Save
Tweet
Share
17.6K Views

Join the DZone community and get the full member experience.

Join For Free

I see a lot of Spring questions on StackOverflow about NoClassDefFoundError, ClassNotFoundException, and MethodNotFoundExceptions, especially with Spring Boot. The cause is nearly always a change to a build dependency in Gradle or Maven that has resulted in the mixing of dependencies. This post considers how approach these issues, providing a starting point, and possibly resolving these issues.

  • Do a clean build – the conflict is being caused by out of date libraries in the maven repository
  • If problems still exist then check Spring’s bill-of-materials to see what versions are recommended, and if they are in conflict with your own pom file versions. The purpose of the bom is discussed in my previous post(https://glenware.wordpress.com/2016/09/07/maven-bill-of-materialsbom/)
  • Check which spring-framework-bom you are using – the import will be of the form:
<dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-framework-bom</artifactId>
            <version>4.3.2.RELEASE</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
    </dependencies>
</dependencyManagement>

In this case we are using 4.3.2.RELEASE. You can then check what versions of other packages spring is using using mvnrepository (https://mvnrepository.com/artifact/org.springframework/spring-framework-bom/4.3.2.RELEASE).

  • For Spring Boot you can further check dependencies using the spring-boot-dependencies pom: https://github.com/spring-projects/spring-boot/tree/master/spring-boot-dependencies

If the above highlights a conflict then your options are:

  • Use the Spring Dependencies – Can you use the dependency version from the spring-bom or dependencies?
  • Dependency Management – can you manage the issue through dependency management?
  • Code Change – It may be that you are upgrading your spring boot or spring version to the latest version. It might be the API’s have changed, so you have to change your code. Time to get the manuals out.
Spring Framework

Published at DZone with permission of Martin Farrell, DZone MVB. See the original article here.

Opinions expressed by DZone contributors are their own.

Related

  • How to Marry MDC With Spring Integration
  • How Spring and Hibernate Simplify Web and Database Management
  • Functional Endpoints: Alternative to Controllers in WebFlux
  • Graceful Shutdown: Spring Framework vs Golang Web Services

Partner Resources

×

Comments

The likes didn't load as expected. Please refresh the page and try again.

ABOUT US

  • About DZone
  • Support and feedback
  • Community research
  • Sitemap

ADVERTISE

  • Advertise with DZone

CONTRIBUTE ON DZONE

  • Article Submission Guidelines
  • Become a Contributor
  • Core Program
  • Visit the Writers' Zone

LEGAL

  • Terms of Service
  • Privacy Policy

CONTACT US

  • 3343 Perimeter Hill Drive
  • Suite 100
  • Nashville, TN 37211
  • [email protected]

Let's be friends: