SpringBoot no main manifest attribute (maven)

Question

When running my jar file: java -jar target/places-1.0-SNAPSHOT.jar

I'm getting the next error :

no main manifest attribute, in target/places-1.0-SNAPSHOT.jar

The pom.xml contains the spring-boot-maven-plugin:

<plugin>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-maven-plugin</artifactId>
    <configuration>
        <mainClass>com.places.Main</mainClass>
    </configuration>
</plugin>

I also tried to create a MANIFEST.MF file and specifying the class, but it didnt help.

In addition, I also tried:

<properties>
      <!-- The main class to start by executing "java -jar" -->
      <start-class>com.places.Main</start-class>
</properties>

Main class:

@SpringBootApplication
public class Main {
    public static void main(String[] args) throws InterruptedException {
        SpringApplication.run(Main.class,args);
    }
}

Any idea what else can I try?

Answer 1

Try adding repackage goal to execution goals.

Otherwise you would need to call the plugin explicitly as mvn package spring-boot:repackage.

With the goal added, you have to call only mvn package.

<plugin>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-maven-plugin</artifactId>
    <configuration>
        <mainClass>com.places.Main</mainClass>
    </configuration>

    <executions>
        <execution>
            <goals>
                <goal>repackage</goal>
            </goals>
        </execution>
    </executions>
</plugin>

Answer 2

During the Maven package lifecycle phase, the jar archive is enhanced by Spring Boot Maven Plugin and the original jar file (that should have been built using the standard maven-jar-plugin) is replaced with an enhanced executable jar.

Hence you have either to issue the spring-boot:repackage goal yourself when building your module:

mvn package spring-boot:repackage

Or add the goal explicitly within the plugin configuration:

<plugin>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-maven-plugin</artifactId>
    <configuration>
        <mainClass>com.places.Main</mainClass>
    </configuration>
    <executions>
        <execution>
            <goals>
                <goal>repackage</goal>
            </goals>
        </execution>
    </executions>
</plugin>

You can find more details about the Spring Boot Maven Plugin repackage goal within the official documentation.

Answer 3

3 things:
- You have the parent entry in your pom.
- Verify that your plugin is in the build portion of the pom.
- You have a class with the @SpringBootApplicaion annotation.

pom.xml:

...  
  <parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.1.8.RELEASE</version>
  </parent>

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

And a class that looks something like this:

@SpringBootApplication
public class Application {

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

}

Answer 4

You can specify a parent POM e.g. :

<parent>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-parent</artifactId>
   <version>2.1.4.RELEASE</version>
</parent>

During the package goal, the repackage goal will be executed and you'll then get an executable jar.

Answer 5

Reback your jar or war using the following command:

mvn package spring-boot:repackage

Add the plugin in plugins parent node like below in pom.xml:

<plugin>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-maven-plugin</artifactId>
   <configuration>                   
      <mainClass>com.sify.scdm.solutionconfigurator.ScdmApplication</mainClass>
   </configuration>
   <executions>
      <execution>
      <goals>
         <goal>repackage</goal>
      </goals>
      </execution>
   </executions>
</plugin>
   



        

Answer 6

added build tag in pom.xml as below solved issue for me.

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

Answer 7

Add the plugin below.This worked for me

 <plugin>
      <groupId>org.apache.maven.plugins</groupId>
      <artifactId>maven-shade-plugin</artifactId>
      <version>1.6</version>
      <executions>
           <!-- Run shade goal on package phase -->
           <execution>
                <phase>package</phase>
                <goals>
                     <goal>shade</goal>
                </goals>
                <configuration>
                     <transformers>
                          <!-- add Main-Class to manifest file -->
                          <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                               <mainClass>MainClass</mainClass>
                               <manifestEntries>
                                    <Class-Path>.</Class-Path>
                                </manifestEntries>
                          </transformer>
                          <transformer
                                 implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
                                 <resource>META-INF/spring.handlers</resource>
                          </transformer>
                          <transformer
                                 implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
                                 <resource>META-INF/spring.schemas</resource>
                          </transformer>
                     </transformers>
                </configuration>
           </execution>
      </executions>
</plugin>