Spring Boot Error: java.lang.NoClassDefFoundError: org/springframework/util/Assert

Question

I am new to Spring Boot and following some video tutorials to get started. I created a Maven project, added a parent dependency of artifact id spring-boot-starter-parent, added dependency for spring-boot-starter-web and spring-boot-starter-test. This is the Application.java:

@RestController
@EnableAutoConfiguration
public class Application {

    @RequestMapping("/")
    public String home() {
        return "Hello World";
    }

    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }

}

Note:

src/test/java and src/test/resources packages are empty. This is a Maven Project, I am using STS, performed "Maven -> Update Project..." and cleaned/build the entire project multiple times using STS IDE and I am getting the following error. Also, I tried to create a new project in STS and still I am getting the following error:

I am getting this error when I run this as a Spring Boot App:

Exception in thread "main" java.lang.NoClassDefFoundError: org/springframework/util/Assert
    at org.springframework.boot.SpringApplication.<init>(SpringApplication.java:263)
    at org.springframework.boot.SpringApplication.<init>(SpringApplication.java:247)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1246)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1234)
    at com.boot.Application.main(Application.java:18)
Caused by: java.lang.ClassNotFoundException: org.springframework.util.Assert
    at java.net.URLClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    ... 5 more

Please help me in resolving this issue.

EDIT:

This is my pom.xml:

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.deloitte.boot</groupId>
  <artifactId>boot-test</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <name>boot-test</name>
  <parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.0.0.RELEASE</version>
  </parent>
  <dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
  </dependencies>
</project>

This is my project directory stricture:

I am using STS, performed "Maven -> Update Project..." and cleaned/build the entire project multiple times and I am getting the same error. Also, I tried to create a new project in STS and still I am getting the same error. Please help. — user182944
– user182944, Commented Mar 18, 2018 at 10:30
Can you try using @SpringBootApplication annotation on your Application Class. — isank-a
– isank-a, Commented Mar 18, 2018 at 10:32
Also it’s a good practice to keep your configuration/application and controller classes separate. — isank-a
– isank-a, Commented Mar 18, 2018 at 10:33

arielduarte · Accepted Answer · 2018-08-19 23:09:02Z

5

I have fixed that issue like this, first I removed my folder .m2 and then I run mvn clean install into my directory spring boot project. that's all!

answered Aug 19, 2018 at 23:09

arielduarte

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1 Comment

Prateek Joshi Over a year ago

Worked for me, why is the question now.

mfaisalhyder · Accepted Answer · 2018-03-18 11:05:45Z

1

It is better to follow software principles while you are learning and making projects. Try to make project in a way that separation of concern is always achieved, that will make your code not just easy to understand, but to debug and fix too.

Change your application class like this:

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class Application {

    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

Now make another package controller and make class in it for your testing

@RestController
//You can add this if you want or remove this class level mapping
@RequestMapping("/testApp")
public class TestController {

    @RequestMapping("/")
    public String home() {
        return "Hello World";
    }
}

For further help. please check this (official spring.io tutorial) simple example of Spring Boot App in STS. And another one is this very simple and straightforward to get Spring Boot App up and running.

Edit: please add starter test in pom.xml as well.

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-test</artifactId>
    <version>1.5.10.RELEASE</version>
    <scope>test</scope>
</dependency>

edited Mar 18, 2018 at 11:05

answered Mar 18, 2018 at 10:40

mfaisalhyder

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8 Comments

user182944 Over a year ago

I tried this and got the same ClassNotFound error. Please suggest.

mfaisalhyder Over a year ago

please post your pom.xml

user182944 Over a year ago

posted above, please help

mfaisalhyder Over a year ago

where is starter-test?

RichArt Over a year ago

This is not really helpful. I have the code already like that and still the error.

|

Mike · Accepted Answer · 2019-01-17 04:29:57Z

Had the same issue with IntelliJ and a brand new project created from Spring Initializer. Saw this message when trying to compile manually:

[ERROR] error reading /Users/mike/.m2/repository/org/springframework/spring-core/5.1.4.RELEASE/spring-core-5.1.4.RELEASE.jar; zip file is empty

Turns out the files downloaded from maven central were corrupt:

ls -al /Users/mike/.m2/repository/org/springframework/spring-core/5.1.4.RELEASE/spring-core-5.1.4.RELEASE.jar
-rw-r--r--  1 mike  staff  0 Jan 16 20:55 
/Users/mike/.m2/repository/org/springframework/spring-core/5.1.4.RELEASE/spring-core-5.1.4.RELEASE.jar

Removing the entire directory and rebuilding forced it to download a new copy of of the missing library:

./mvnw compile
Downloading from central: https://repo.maven.apache.org/maven2/org/springframework/spring-core/5.1.4.RELEASE/spring-core-5.1.4.RELEASE.pom
Downloaded from central: https://repo.maven.apache.org/maven2/org/springframework/spring-core/5.1.4.RELEASE/spring-core-5.1.4.RELEASE.pom (3.6 kB at 7.6 kB/s)
Downloading from central: https://repo.maven.apache.org/maven2/org/springframework/spring-core/5.1.4.RELEASE/spring-core-5.1.4.RELEASE.jar
Downloaded from central: https://repo.maven.apache.org/maven2/org/springframework/spring-core/5.1.4.RELEASE/spring-core-5.1.4.RELEASE.jar (1.3 MB at 3.6 MB/s)

Azarov · Accepted Answer · 2018-10-31 18:11:44Z

0

Had the same issue, after I installed STS (before that, everything in Eclipse was going ok). I removed the springframework folder that was inside the .m2 folder, then ran 'mvn clean install' in my project directory. After that I encountered an issue with my assertj-core-3.11.1.jar and mockito-core-2.23.0.jar (ZipFile invalid LOC header (bad signature)), so I also removed them and ran "mvn spring-boot:run".

Now it works (but I can't really explain why).

answered Oct 31, 2018 at 18:11

Azarov

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