Spring boot java.lang.ClassNotFoundException

Question

I have created a simple spring boot application. I am able to mvn clean install and the jar is getting created successfully. But when I try to run java -jar or mvn spring-boot:run the execution fails with

"Could not find or load main class com.xyx.webpage.xyx Caused by: java.lang.ClassNotFoundException: com.xyx.webpage.xyx"

Please see my pom for more details

<?xml version="1.0" encoding="UTF-8"?>
<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.xyx</groupId>
<artifactId>webpage</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>

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

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.1.1.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>
    <spring-cloud.version>Greenwich.M3</spring-cloud.version>
    <!-- <start-class>com.xyx.webpage.xyx</start-class> -->
</properties>

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-actuator</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>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-devtools</artifactId>
        <scope>runtime</scope>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-tomcat</artifactId>
        <scope>provided</scope>
    </dependency>

    <!-- JSTL for JSP -->
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>jstl</artifactId>
    </dependency>

    <!-- Need this to compile JSP -->
    <dependency>
        <groupId>org.apache.tomcat.embed</groupId>
        <artifactId>tomcat-embed-jasper</artifactId>
        <scope>provided</scope>
    </dependency>

    <!-- Need this to compile JSP, 
        tomcat-embed-jasper version is not working, no idea why -->
    <dependency>
        <groupId>org.eclipse.jdt.core.compiler</groupId>
        <artifactId>ecj</artifactId>
        <version>4.6.1</version>
        <scope>provided</scope>
    </dependency>

    <!-- Optional, test for static content, bootstrap CSS-->
    <dependency>
        <groupId>org.webjars</groupId>
        <artifactId>bootstrap</artifactId>
        <version>3.3.7</version>
    </dependency>
</dependencies>

<dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-dependencies</artifactId>
            <version>${spring-cloud.version}</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
    </dependencies>
</dependencyManagement>


<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
            <configuration>    
            <mainClass>com.xyx.webpage.xyx</mainClass>
        </configuration>
        </plugin>
    </plugins>
</build>

<repositories>
    <repository>
        <id>spring-milestones</id>
        <name>Spring Milestones</name>
        <url>https://repo.spring.io/milestone</url>
        <snapshots>
            <enabled>false</enabled>
        </snapshots>
    </repository>
</repositories>

</project>

What would zipinfo -1 path/to/your.jar | grep HiringApplication show? — Karol Dowbecki
– Karol Dowbecki, Commented Dec 17, 2018 at 19:30
So I unzipped my jar and actually there are no java class files which are getting packaged. Is there a way i can fix this? — jetty
– jetty, Commented Dec 18, 2018 at 3:03

Dzmitry Bahdanovich · Accepted Answer · 2019-05-31 04:13:21Z

1

Using this should resolve the issue

In pom.xml, add

    <properties>
        <start-class>com.hiringcupid.webpage.HiringApplication</start-class>
        ...
    </properties>

Remember, I am using Springboot 2

edited May 31, 2019 at 4:13

Dzmitry Bahdanovich

1,8253 gold badges19 silver badges35 bronze badges

answered May 31, 2019 at 2:28

Sandeep G

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Comments

avishka eranga · Accepted Answer · 2018-12-17 19:35:40Z

0

Please remove below code,

<mainClass>com.hiringcupid.webpage.HiringApplication</mainClass>

Annotate main class to @SpringBootApplication annotation

answered Dec 17, 2018 at 19:35

avishka eranga

1132 silver badges11 bronze badges

1 Comment

jetty Over a year ago

The class is annotated with the @SpringBootApplication. If I dont have start class in properties or maincClass in build plugins the jar creation itself is failing. I am able to run my application from eclipse. The issue is when I am trying to package do java- jar from terminal

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