Maven assembly single goal not works.

[Tim Wu T]

HI there,

I try to use the assembly single goal to generate a jar with dependencies, my 
config looks like this:
                     <plugin>
                           <artifactId>maven-assembly-plugin</artifactId>
                           <version>2.3</version>
                           <configuration>
                                  <archive>
                                         <manifest>
                                                
<mainClass>org.testng.TestNG</mainClass>
                                         </manifest>
                                  </archive>
                                  <descriptorRefs>
                                         
<descriptorRef>jar-with-dependencies</descriptorRef>
                                  </descriptorRefs>
                           </configuration>
                           <executions>
                                  <execution>
                                         <id>make-assembly</id> <!-- this is 
used for inheritance merges -->
                                         <phase>package</phase> <!-- bind to 
the packaging phase -->
                                         <goals>
                                                <goal>single</goal>
                                         </goals>
                                  </execution>
                           </executions>
                     </plugin>

I can use the mvn clean install to generate jar with dependnecies well, but if 
I want to try assembly:single, than it will show me
Cannot include project artifact: xxxxxx; it doesn't have an associated file or 
directory.

Any comments for this?

Br,
Tim