I created a Maven project for Spring Boot. I have a lot of Spring dependencies and one main class:
package com.vastserver;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class MyArtifactApplication {
public static void main(String[] args) {
// SpringApplication.run(MyArtifactApplication.class, args);
System.out.println("hello!");
}
}
The folder structure of src
directory is:
.
└── main
├── java
│ └── com
│ └── vastserver
│ └── MyArtifactApplication.java
└── resources
└── application.properties
In my pom.xml I use maven-assembly-plugin
in order to build my project in a standalone .jar file. Even though I triple checked that the directory structure and main class file appear correctly in the pom.xml I keep getting the error: Error: Could not find or load main class com.vastserver.MyArtifactApplication
when I run mvn package
and then java -cp target/vast-ad-server-artifactId-1.0-SNAPSHOT-jar-with-dependencies.jar com.vastserver.MyArtifactApplication
or mvn exec:exec
. The main class does work if I run it from Intellij so I know the code is not the problem but rather Maven build settings. I lost at where my problem could be.
My pom.xml looks as follows:
<?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>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.6.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<maven.compiler.release>11</maven.compiler.release>
<maven.compiler.source>11</maven.compiler.source>
<maven.compiler.target>11</maven.compiler.target>
<mainClass>com.vastserver.MyArtifactApplication</mainClass>
<descriptorRef>jar-with-dependencies</descriptorRef>
<targetSnapshot>target/vast-ad-server-artifactId-1.0-SNAPSHOT</targetSnapshot>
<targetWithDependencies>${targetSnapshot}-${descriptorRef}.jar</targetWithDependencies>
</properties>
<groupId>com.vastserver</groupId>
<artifactId>vast-ad-server-artifactId</artifactId>
<packaging>jar</packaging>
<version>1.0-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-activemq</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-webflux</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.postgresql</groupId>
<artifactId>postgresql</artifactId>
<scope>runtime</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-assembly-plugin</artifactId>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
<configuration>
<archive>
<manifest>
<mainClass>${mainClass}</mainClass>
</manifest>
</archive>
<descriptorRefs>
<descriptorRef>${descriptorRef}</descriptorRef>
</descriptorRefs>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>1.3.2</version>
<executions>
<execution>
<goals>
<goal>exec</goal>
</goals>
</execution>
</executions>
<configuration>
<executable>java</executable>
<arguments>
<argument>-cp</argument>
<argument>${targetWithDependencies}</argument>
<argument>${mainClass}</argument>
</arguments>
</configuration>
</plugin>
</plugins>
</build>
</project>
For me: Maven - Update Project worked.
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