java.lang.NoClassDefFoundError: org/springframework/core/env/ConfigurableEnvironment

Question

I am trying to write a simple RESTful service using Spring Boot. However, there is an error message I am not able to solve. I have been researching and it looks like it is a

Answer 1

Recommended Approach

1. Go to Spring boot Initialzr site and select web stack as a dependency as shown in below .
2. As Spring Boot uses the concept of Opinionated dependencies and Bill of Materials, It will automatically pull the other dependencies and resolve your classNotFoundException issue. And in your case it misses out the Spring-core-4.2.4.RELEASE.jar dependency.

3. Execute the Maven Goal as clean install spring-boot:run -e and you can find your maven dependencies in your IDE and below given is a sample POM file.

     
    
       4.0.0
   
      com.example
     demo
    0.0.1-SNAPSHOT
    war
   
        demo
       Demo project for Spring Boot
   
        
          org.springframework.boot
         spring-boot-starter-parent
        1.4.0.RELEASE
         
      
   
       
         UTF-8
          UTF-       8
       1.8
       
   
    
        
          org.springframework.boot
           spring-boot-starter-web
        
   
        
             org.springframework.boot
               spring-boot-starter-tomcat
                provided
         
       
       org.springframework.boot
       spring-boot-starter-actuator
        
        
           org.springframework.boot
           spring-boot-starter-test
           test
         < /dependency>
       
   
     
       demo
          
            
               org.springframework.boot
               spring-boot-maven-plugin