no main manifest attribute error when running java -jar and java -cp

Question

i have application and when i want to run use java -jar myjar.jar i got error like that

here my pom.xml

<build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <mainClass>id.myapp.App</mainClass>
                </configuration>
            </plugin>
            <plugin>
                <artifactId>maven-assembly-plugin</artifactId>
                <executions>
                    <execution>
                        <phase>package</phase>
                        <goals>
                            <goal>single</goal>
                        </goals>
                    </execution>
                </executions>
                <configuration>
                    <descriptorRefs>
                        <descriptorRef>jar-with-dependencies</descriptorRef>
                    </descriptorRefs>
                </configuration>
            </plugin>
        </plugins>
    </build>

i have define where is the main class. and i also have try to use

java -cp java -cp Myjar.jar com.somepackage.App(class App)

but when i use that i still got error with no main manifest attribute. my apps use Springboot application. how to fix it ? this problem is on my configuration or something in spring apps ?