Hi there,

This is probably a really odd question, but I just can't get the very first examples working. I really don't know anything about Maven, and am faced with this:

C:\spring1\src\chapter1\monolithic>mvn exec:java -Dexec.mainClass=com.wrox.begsp
ring.CalculateSpring -Dexec.args="300 3"
[INFO] Scanning for projects...
[INFO] Searching repository for plugin with prefix: 'exec'.
[INFO] ------------------------------------------------------------------------
[ERROR] BUILD ERROR
[INFO] ------------------------------------------------------------------------
[INFO] The plugin 'org.apache.maven.plugins:maven-exec-plugin' does not exist or
 no valid version could be found
[INFO] ------------------------------------------------------------------------
[INFO] For more information, run Maven with the -e switch
[INFO] ------------------------------------------------------------------------
[INFO] Total time: < 1 second
[INFO] Finished at: Mon Feb 25 12:27:27 GMT 2008
[INFO] Final Memory: 1M/4M
[INFO] ------------------------------------------------------------------------

when I try to run the examples from the first chapter in the book (although they compile fine). Maven seems to be configured correctly, but do I need to add more default repositories or something? I've been surprised to not find any other posts of this problem, did other people manage to run the examples without any trouble?

Thanks for any help!

I'm encountering the same issue on a freshly installed system. Just grabbed Maven - and figured an easy way to test it would be by using the Beginning Spring Framework 2 examples. Odd thing is - I've installed Maven in exactly the same way as I did before (last week - same OS, etc.) and it just worked...

Perhaps someone pulled the "exec" plug-in from the central Maven repository? If so, that's a pretty egregious issue to have with a build tool. I suppose if I had a local cache on my fresh install then I'd be all set. And other systems that already have Maven installed, and have used the exec plug-in before should also be all set.

Too much voodoo.

Hello,

I had the same problem and found a solution on the web.

try to fully specify the plugin on the command line. That should make sure that maven downloads the right plugin:

mvn org.codehaus.mojo:exec-maven-plugin:exec

Thanks for that. I eventually managed to get it running by downloading the plugin from mojo.codehaus.org to my Maven lib directory, but I'm guessing the qualified name would be the 'right' way. Maybe it dropped out of the latest release by accident.

I needed the latest version, a beta release, as previous versions wouldn't pass through the arguments on the command line. It's kinda frustrating but I guess at least I got my hands dirty with Maven.

Thanks folks. I got the same build error, and got it to work by doing what mkeehan suggested. Downloaded

exec-maven-plugin-1.1-beta-1.jar

to the maven lib dir.

The exec got alot further this time, but...
Persisting User = user1
Persisting User
User = This is my album
java.sql.SQLException: Table not found in statement [insert into album_sequence values (null)]

Sounds like a source code problem. Yes, this is getting to be a bit frustrating. There seems to be alot of bugs in this book.

-Greg

1. maven-exec-plugin issue : I resolved it this way
a) Build and Install the plugin: (from http://jwebunit.sourceforge.net/building-maven.html)

svn co https://svn.codehaus.org/mojo/trunk/...-maven-plugin/
cd exec-maven-plugin
mvn clean install

Perhaps a little overwhelming but actually quite easy and fast (you will need svn installed @ http://subversion.tigris.org/project_packages.html)

b) The command line is incorrect in the book; the one below is working for me:

mvn exec:java -Dexec.mainClass=com.wrox.begspring.Calculate -Dexec.args="3000 3"

The error is subtle and lies in how to set the properties - perhaps is this a change in versions; this you can check for the latest version @ http://mojo.codehaus.org/exec-maven-plugin/usage.html