Jar does not perform

Question

I am using netbeans and Maven. When I try to run the jar file in cmd, the error shown is "no major manifest attribute in".

Follow the nbactions.xml code:

<?xml version="1.0" encoding="UTF-8"?>
<actions>
        <action>
            <actionName>run</actionName>
            <packagings>
                <packaging>jar</packaging>
            </packagings>
            <goals>
                <goal>process-classes</goal>
                <goal>org.codehaus.mojo:exec-maven-plugin:1.2.1:exec</goal>
            </goals>
            <properties>
                <exec.args>-classpath %classpath br.com.swing.Main</exec.args>
                <exec.executable>java</exec.executable>
                <exec.workingdir>C:\Users\Fabio\Documents\NetBeansProjects\EnterpretadorQRcode\src\main\java\br\com\swing</exec.workingdir>
            </properties>
        </action>
        <action>
            <actionName>debug</actionName>
            <packagings>
                <packaging>jar</packaging>
            </packagings>
            <goals>
                <goal>process-classes</goal>
                <goal>org.codehaus.mojo:exec-maven-plugin:1.2.1:exec</goal>
            </goals>
            <properties>
                <exec.args>-Xdebug -Xrunjdwp:transport=dt_socket,server=n,address=${jpda.address} -classpath %classpath br.com.swing.Main</exec.args>
                <exec.executable>java</exec.executable>
                <jpda.listen>true</jpda.listen>
                <exec.workingdir>C:\Users\Fabio\Documents\NetBeansProjects\EnterpretadorQRcode\src\main\java\br\com\swing</exec.workingdir>
            </properties>
        </action>
        <action>
            <actionName>profile</actionName>
            <packagings>
                <packaging>jar</packaging>
            </packagings>
            <goals>
                <goal>process-classes</goal>
                <goal>org.codehaus.mojo:exec-maven-plugin:1.2.1:exec</goal>
            </goals>
            <properties>
                <exec.args>-classpath %classpath br.com.swing.Main</exec.args>
                <exec.executable>java</exec.executable>
                <exec.workingdir>C:\Users\Fabio\Documents\NetBeansProjects\EnterpretadorQRcode\src\main\java\br\com\swing</exec.workingdir>
            </properties>
        </action>
    </actions>

segue codigo do pom.xml

``` lang-xml
<?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>Enterpretador</groupId>
    <artifactId>EnterpretadorQRcode</artifactId>
    <version>1.0</version>
    <packaging>jar</packaging>
    <dependencies>
        <dependency>
            <groupId>com.1stleg</groupId>
            <artifactId>jnativehook</artifactId>
            <version>2.1.0</version>
        </dependency>
        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>2.5</version>
            <type>jar</type>
        </dependency>
    </dependencies>
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
    </properties>
    <name>EnterpretadorQRcode</name>
</project>

Answer 1

You need to add the main class in the file pom.xml. Browse the plugins tag and add the following:

<build>
   <plugins>
      <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-jar-plugin</artifactId>
         <version>3.8.0</version>
         <configuration>
            <archive>
               <manifest>
                  <mainClass>br.com.renan.MinhaClasse</mainClass>
               </manifest>
            </archive>
         </configuration>
      </plugin>
   </plugins>
</build>

Answer 2

I managed to solve the problem by adding a build plugin I do not know how it works right. But this way it creates two jars. One with classes without dependencies and one with dependencies. Follows lines added in pom:

<build>
<plugins>
    <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.6.1</version>
        <configuration>
            <source>1.8</source>
            <target>1.8</target>
        </configuration>
    </plugin>  
    <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-shade-plugin</artifactId>
        <version>2.4.3</version>
        <executions>
            <execution>
                <phase>package</phase>
                <goals>
                    <goal>shade</goal>
                </goals>
                <configuration>
                    <transformers>
                        <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                            <mainClass>br.com.swing.Main</mainClass>
                        </transformer>
                    </transformers>
                </configuration>
            </execution>
        </executions>
    </plugin>
</plugins>