How to set classpath for a maven project

Question

I created a maven project with eclipse and made jar file from it with this below comand

mvn package

when i try to know my mvn project config is true or not with this command

mvn exec:java -D exec.mainClass="giraph.helloworld.App"

i get this error :

failed to execute goal
org.codehaus.mojo:exec-maven-plugin:1.2.1:java(default-cli) on project helloworld: An exception occured while executing the java class. null: InvocationTargetException: No arguments were provided

POM.xml setting of project is as follows. I will be so grateful if anyone can help me and specifies the reasons of this error?

  <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>giraph</groupId>   
    <artifactId>helloworld</artifactId>  
    <version>0.0.1-SNAPSHOT</version>   
    <packaging>jar</packaging>

    <name>helloworld</name>   
    <url>http://maven.apache.org</url>

    <properties>
      <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>            
     </properties>

    <dependencies>      
    <dependency>
        <groupId>org.apache.giraph</groupId>
        <artifactId>giraph-core</artifactId>
        <version>1.1.0</version>    
    </dependency>       
    <dependency>    
        <groupId>org.apache.maven.plugins</groupId>  
        <artifactId>maven-compiler-plugin</artifactId>  
        <version>2.0.2</version>    
    </dependency>       
   <dependency>
        <groupId>org.apache.hadoop</groupId>
        <artifactId>hadoop-core</artifactId>
        <version>1.2.1</version>
   </dependency>    
   <dependency>     
    <groupId>org.apache.maven.plugins</groupId>  
    <artifactId>maven-surefire-plugin</artifactId>  
    <version>2.10</version>
   </dependency>  
 </dependencies>
 <build> 
   <plugins>
     <plugin>
        <groupId>org.codehaus.mojo</groupId>
        <artifactId>exec-maven-plugin</artifactId>
        <version>1.2.1</version>
        <executions>
        <execution>
          <goals>
            <goal>java</goal>
          </goals>
         <configuration>
           <mainClass>giraph.helloworld.App</mainClass>
         </configuration>
        </execution>
       </executions>
     </plugin>
  </plugins>
 </build> 
</project>

I add mainClass in POM file using exec-maven-plugin. I think POM file acts like a manifest . is it true? — Erfan Farhangy
– Erfan Farhangy, Commented Feb 13, 2017 at 1:46
POM is supposed to generate that but there are some things missing in your POM. Check this out - mkyong.com/maven/how-to-create-a-manifest-file-with-maven — opensam
– opensam, Commented Feb 13, 2017 at 1:47
I dont see manifest file in my POM file. is it exist in my project? — Erfan Farhangy
– Erfan Farhangy, Commented Feb 13, 2017 at 1:52

Community · Accepted Answer · 2017-05-23 11:53:17Z

1

I think the problem is that your manifest file does not contain information about the entry point (the main class) of your jar. See Setting an Application entry point.

There are many ways to rectify this problem. You can use maven assembly plugin. For more details, check here

edited May 23, 2017 at 11:53

CommunityBot

11 silver badge

answered Feb 13, 2017 at 2:16

opensam

3581 gold badge4 silver badges10 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

How to set classpath for a maven project

1 Answer 1

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related