Cannot make executable jar using m2eclipse

I have just started learning how to use m2eclipse. What I am trying to do is make a very simple program (Hello, World) and turn it into an executable jar. The java code itself is:

public class Speak {

/** * @param args */ public static void main(String[] args) { System.out.println("Meow!"); } } 

which runs fine as a Java application. I then try to use Maven to build the program, which it does, but then when I try to run the .jar it tells me "Failed to load Main-Class attribute from ...". This is the .pom that m2eclipse generated when I started the project:

<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>org.felines</groupId> <artifactId>tabbies</artifactId> <version>0.0</version> <dependencies> <dependency> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-jar-plugin</artifactId> <version>2.3.1</version> <type>maven-plugin</type> <scope>compile</scope> </dependency> </dependencies> </project> 

I have tried modifying the .pom, like so:

<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>org.felines</groupId> <artifactId>tabbies</artifactId> <version>0.0</version> <build> <plugins> <plugin> <artifactId>maven-jar-plugin</artifactId> <version>2.3.1</version> <configuration> <archive> <manifest> <mainClass>org.felines.Speak</mainClass> <packageName>org.felines</packageName> </manifest> <manifestEntries> <mode>development</mode> <url>${pom.url}</url> </manifestEntries> </archive> </configuration> </plugin> </plugins> </build> </project> 

Now it says "Could not find the main class: org.felines.Speak. Program will exit." Any ideas? :(

Thank you for your time!