caused by java.lang.NoClassDefFoundError: com/fasterxml/jackson/databind/Module in spring starter project in IntelIj

Question

In my spring starter project, I am trying to do API calls using the JPA. My pom.xml look like this:

4.0.0

<groupId>com.example</groupId>
<artifactId>demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>

<name>demo</name>
<description>Demo project for Spring Boot</description>

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.5.8.RELEASE</version>
    <relativePath/> <!-- lookup parent from repository -->
</parent>

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    <java.version>1.8</java.version>
</properties>

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-jpa</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-rest</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-core</artifactId>
        <version>2.8.5</version>
    </dependency>
</dependencies>

<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
        </plugin>
    </plugins>
</build>

When I try to run it is getting error as

java.lang.NoClassDefFoundError: com/fasterxml/jackson/databind/Module

"NoClassDefFoundError" mean that that class was present when that part of the code was compiled, but isn't present at runtime. — Thorbjørn Ravn Andersen
– Thorbjørn Ravn Andersen, Commented Nov 27, 2017 at 14:40

helospark · Accepted Answer · 2017-11-27 21:13:38Z

8

spring-boot-starter-web already includes Jackson. You should not override the managed version, otherwise the versions can be different between different Jackson libraries, causing ClassNotFoundException.

Remove this from the pom:

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-core</artifactId>
    <version>2.8.5</version>
</dependency>

and let the transitive dependency with the correct version be used.

Or when you add Jackson to your pom, just don't use any version number, since parent project dependency management already includes all jackson libraries with a consistent version.

edited Nov 27, 2017 at 21:13

answered Nov 27, 2017 at 20:46

helospark

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Vladimir Vivi · Accepted Answer · 2017-11-27 13:51:54Z

2

Try 2 options :

 <dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>2.8.8</version>

or

<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>2.7.3</version>

answered Nov 27, 2017 at 13:51

Vladimir Vivi

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5 Comments

Programmer Over a year ago

Thank you for your response. I have added the following to pom.xml: <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-core</artifactId> <version>2.4.3</version> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> <version>2.4.3</version> </dependency>

Programmer Over a year ago

Now the error is gone. But while running getting an error as "Unable to start embedded container; nested exception is org.springframework.boot.context.embedded.EmbeddedServletContainerException: Unable to start embedded Tomcat". Can you please help me to resolve this

Vladimir Vivi Over a year ago

@Programmer ,it's problem with starting server Tomcat.First attempt to try-stop & clean Tomcat,and start server....if it's not starting,then second attempt:refactor with config:@SpringBootApplication,@ComponentScan...

Programmer Over a year ago

I have added @SpringBootApplication,@EnableAutoConfiguration,@Configuration,@ComponentScan({"controller","service"}) the above lines to my main class and tried. Still, the error is there.

Vladimir Vivi Over a year ago

@Programmer , then try removing this @ComponentScan({"‌controller","service‌"}) and refactor server

Lho Ben · Accepted Answer · 2021-02-23 11:54:51Z

0

If you are using SpringBoot you should know that Jackson is added by default. so remove to avoid conflicting versions and it should work.

answered Feb 23, 2021 at 11:54

Lho Ben

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