Re: Trouble with mojo tutorial

Fri, 31 Aug 2007 08:38:58 -0700 

Hi,
perhaps it would be better if you would start from scratch, to have a clean state. 

Then just do this:

1.

mvn archetype:create \
  -DgroupId=sample.plugin \
  -DartifactId=maven-hello-plugin \
  -DarchetypeGroupId=org.apache.maven.archetypes \
  -DarchetypeArtifactId=maven-archetype-mojo

This will generate a simple plugin project with a sample mojo.

2.

Add the 'GreetingsMojo.java' to 'src/main/java/sample/plugin'

3.

Do an 'mvn install'.

4.

Now you can use the plugin from every maven project by executing:

  mvn sample.plugin:maven-hello-plugin:1.0-SNAPSHOT:sayhi


There is no need to specify the hello-plugin in the <build/><plugins/> 
section of a pom unless you want it to execute automatically during a 
build or lock its version.



You may also want to read the chapters on plugin development in the two 
maven books [1], [2],


-Tim

[1] http://www.sonatype.com/book/
[2] http://www.devzuz.com/web/guest/products/resources#BBWM

siegfried schrieb:

Thanks Wayne.
I tried that but no luck! The tutorial does not specify where to put
c:/dev/sandboxes/maven/sample-mojo/maven-hello-plugin/src/main/java/sample/p
lugin/GreetingMojo.java. I suspect I don't have this in the correct
directory. Since I did the steps out of order, I already had a
src/main/java/sample/plugin directory which looked like a logical place to
put GreetingMojo.java.  Where is the pom.xml in the tutorial looking for
GreetingMojo.java?

Thanks,
Siegfried

cd c:/dev/sandboxes/maven/sample-mojo/maven-hello-plugin/
mvn install
[INFO] Scanning for projects...

[INFO]
----------------------------------------------------------------------------

[INFO] Building Sample Parameter-less Maven Plugin

[INFO]    task-segment: [install]

[INFO]
----------------------------------------------------------------------------

[INFO] artifact org.apache.maven.plugins:maven-plugin-plugin: checking for
updates from central

Downloading:
http://repo1.maven.org/maven2/org/apache/maven/plugins/maven-plugin-plugin/2
.3/maven-plugin-plugin-2.3.pom

4/6K
6/6K
6K downloaded

Downloading:
http://repo1.maven.org/maven2/org/apache/maven/plugins/maven-plugin-plugin/2
.3/maven-plugin-plugin-2.3.jar

4/21K
8/21K
12/21K
16/21K
20/21K
21/21K
21K downloaded

[INFO] artifact org.apache.maven.plugins:maven-jar-plugin: checking for
updates from central

[INFO] artifact org.apache.maven.plugins:maven-install-plugin: checking for
updates from central

Downloading:
http://repo1.maven.org/maven2/org/apache/maven/plugins/maven-install-plugin/
2.2/maven-install-plugin-2.2.pom

2/2K
2K downloaded

Downloading:
http://repo1.maven.org/maven2/org/apache/maven/plugins/maven-install-plugin/
2.2/maven-install-plugin-2.2.jar

4/15K
8/15K
12/15K
15/15K
15K downloaded

[INFO]
------------------------------------------------------------------------

[ERROR] BUILD FAILURE

[INFO]
------------------------------------------------------------------------

[INFO] A required plugin was not found: Plugin could not be found - check
that the goal name is correct: Unable to download the artifact from any
repository



Try downloading the file manually from the project website.




Then, install it using the command: 


    mvn install:install-file -DgroupId=sample.plugin
-DartifactId=maven-hello-plugin \
        -Dversion=1.0-SNAPSHOT -Dpackaging=maven-plugin -Dfile=/path/to/file

Alternatively, if you host your own repository you can deploy the file
there:     mvn deploy:deploy-file -DgroupId=sample.plugin
-DartifactId=maven-hello-plugin \
        -Dversion=1.0-SNAPSHOT -Dpackaging=maven-plugin -Dfile=/path/to/file
\
         -Durl=[url] -DrepositoryId=[id]





  sample.plugin:maven-hello-plugin:maven-plugin:1.0-SNAPSHOT



from the specified remote repositories:

  central (http://repo1.maven.org/maven2)



  sample.plugin:maven-hello-plugin:maven-plugin:1.0-SNAPSHOT



from the specified remote repositories:

  central (http://repo1.maven.org/maven2)



[INFO]
------------------------------------------------------------------------

[INFO] For more information, run Maven with the -e switch

[INFO]
------------------------------------------------------------------------

[INFO] Total time: 5 seconds

[INFO] Finished at: Fri Aug 31 09:17:20 MDT 2007

[INFO] Final Memory: 3M/6M

[INFO]
------------------------------------------------------------------------


Compilation exited abnormally with code 1 at Fri Aug 31 09:17:20
cd c:/dev/sandboxes/maven/sample-mojo/maven-hello-plugin/
mvn sample.plugin:maven-hello-plugin:1.0-SNAPSHOT:sayhi
[INFO] Scanning for projects...

[INFO] Cannot find mojo descriptor for:
'sample.plugin:maven-hello-plugin:1.0-SNAPSHOT:sayhi' - Treating as
non-aggregator.

[INFO]
----------------------------------------------------------------------------

[INFO] Building Sample Parameter-less Maven Plugin

[INFO]    task-segment:
[sample.plugin:maven-hello-plugin:1.0-SNAPSHOT:sayhi]

[INFO]
----------------------------------------------------------------------------

[INFO]
------------------------------------------------------------------------

[ERROR] BUILD FAILURE

[INFO]
------------------------------------------------------------------------

[INFO] A required plugin was not found: Plugin could not be found - check
that the goal name is correct: Unable to download the artifact from any
repository



Try downloading the file manually from the project website.




Then, install it using the command: 


    mvn install:install-file -DgroupId=sample.plugin
-DartifactId=maven-hello-plugin \
        -Dversion=1.0-SNAPSHOT -Dpackaging=maven-plugin -Dfile=/path/to/file

Alternatively, if you host your own repository you can deploy the file
there:     mvn deploy:deploy-file -DgroupId=sample.plugin
-DartifactId=maven-hello-plugin \
        -Dversion=1.0-SNAPSHOT -Dpackaging=maven-plugin -Dfile=/path/to/file
\
         -Durl=[url] -DrepositoryId=[id]





  sample.plugin:maven-hello-plugin:maven-plugin:1.0-SNAPSHOT



from the specified remote repositories:

  central (http://repo1.maven.org/maven2)



  sample.plugin:maven-hello-plugin:maven-plugin:1.0-SNAPSHOT



from the specified remote repositories:

  central (http://repo1.maven.org/maven2)



[INFO]
------------------------------------------------------------------------

[INFO] For more information, run Maven with the -e switch

[INFO]
------------------------------------------------------------------------

[INFO] Total time: < 1 second

[INFO] Finished at: Fri Aug 31 09:19:59 MDT 2007

[INFO] Final Memory: 1M/4M

[INFO]
------------------------------------------------------------------------


Compilation exited abnormally with code 1 at Fri Aug 31 09:19:59

-----Original Message-----

From: Wayne Fay [mailto:[EMAIL PROTECTED] 
Sent: Friday, August 31, 2007 12:49 AM

To: Maven Users List
Subject: Re: Trouble with mojo tutorial

You need to run "mvn install" to install your plugin into the local repo
cache.

Then you can test your plugin in another project by specifying "mvn
...:sayhi".

Wayne

On 8/31/07, siegfried <[EMAIL PROTECTED]> wrote:

Thanks Wayne, that "-U" appeared to work.

Now I started out the tutorial with the command
mvn -U archetype:create \
  -DgroupId=sample.plugin \
  -DartifactId=maven-hello-plugin \
  -DarchetypeGroupId=org.apache.maven.archetypes \
  -DarchetypeArtifactId=maven-archetype-mojo

because the tutorial did not tell you where to place the files pom.xml and
GreetingMojo.java. So I just put GreetingMojo down in the directly with

the

other java source code. Then I clobbered the pom.xml file with pom.xml

from

http://maven.apache.org/guides/plugin/guide-java-plugin-development.html.

Below is my pom.xml which I copied from
http://maven.apache.org/guides/plugin/guide-java-plugin-development.html .
Below that are the results when I try to "mvn
sample.plugin:maven-hello-plugin:1.0-SNAPSHOT:sayhi" as per the
instructions.

What am I doing wrong? I am not seeing "Hello, World".

I believe I have copied the


c:/dev/sandboxes/maven/sample-mojo/maven-hello-plugin/src/main/java/sample/p

lugin/GreetingMojo.java correctly from that web page.

So then when I realized that I executed the command " mvn -U
archetype:create... " too soon and tried moving GreetingMojo.java to
c:/dev/sandboxes/maven/sample-mojo/maven-hello-plugin/GreetingMojo.java

and

running the command again but that did not help.


Thanks,
Siegfried


Here is my c:/dev/sandboxes/maven/sample-mojo/maven-hello-plugin/pom.xml.
Does it need to begin with a <?xml version="1.0" encoding="utf-8"?> tag?

Why

not?

<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/maven-v4_0_0.xsd";>
  <modelVersion>4.0.0</modelVersion>
  <groupId>sample.plugin</groupId>
  <artifactId>maven-hello-plugin</artifactId>
  <packaging>maven-plugin</packaging>
  <version>1.0-SNAPSHOT</version>
  <name>Sample Parameter-less Maven Plugin</name>
  <dependencies>
    <dependency>
      <groupId>org.apache.maven</groupId>
      <artifactId>maven-plugin-api</artifactId>
      <version>2.0</version>
    </dependency>
  </dependencies>
  <build>
    <plugins>
      <plugin>
        <groupId>sample.plugin</groupId>
        <artifactId>maven-hello-plugin</artifactId>
        <version>1.0-SNAPSHOT</version>
      </plugin>
    </plugins>
  </build>
</project>

Here are the results:
cd c:/dev/sandboxes/maven/sample-mojo/maven-hello-plugin/
mvn sample.plugin:maven-hello-plugin:1.0-SNAPSHOT:sayhi
[INFO] Scanning for projects...

[INFO] Cannot find mojo descriptor for:
'sample.plugin:maven-hello-plugin:1.0-SNAPSHOT:sayhi' - Treating as
non-aggregator.

[INFO]


----------------------------------------------------------------------------

[INFO] Building Sample Parameter-less Maven Plugin

[INFO]    task-segment:
[sample.plugin:maven-hello-plugin:1.0-SNAPSHOT:sayhi]

[INFO]


----------------------------------------------------------------------------

[INFO]
------------------------------------------------------------------------

[ERROR] BUILD FAILURE

[INFO]
------------------------------------------------------------------------

[INFO] A required plugin was not found: Plugin could not be found - check
that the goal name is correct: Unable to download the artifact from any
repository



Try downloading the file manually from the project website.



Then, install it using the command:

    mvn install:install-file -DgroupId=sample.plugin
-DartifactId=maven-hello-plugin \
        -Dversion=1.0-SNAPSHOT -Dpackaging=maven-plugin

-Dfile=/path/to/file

Alternatively, if you host your own repository you can deploy the file
there:     mvn deploy:deploy-file -DgroupId=sample.plugin
-DartifactId=maven-hello-plugin \
        -Dversion=1.0-SNAPSHOT -Dpackaging=maven-plugin

-Dfile=/path/to/file

\
         -Durl=[url] -DrepositoryId=[id]





  sample.plugin:maven-hello-plugin:maven-plugin:1.0-SNAPSHOT



from the specified remote repositories:

  central (http://repo1.maven.org/maven2)



  sample.plugin:maven-hello-plugin:maven-plugin:1.0-SNAPSHOT



from the specified remote repositories:

  central (http://repo1.maven.org/maven2)



[INFO]
------------------------------------------------------------------------

[INFO] For more information, run Maven with the -e switch

[INFO]
------------------------------------------------------------------------

[INFO] Total time: < 1 second

[INFO] Finished at: Fri Aug 31 00:04:30 MDT 2007

[INFO] Final Memory: 1M/4M

[INFO]
------------------------------------------------------------------------


Compilation exited abnormally with code 1 at Fri Aug 31 00:04:30















-----Original Message-----
From: Wayne Fay [mailto:[EMAIL PROTECTED]
Sent: Wednesday, August 29, 2007 3:56 PM
To: Maven Users List
Subject: Re: Trouble with mojo tutorial

Try mvn -U ... to force an update.

1.0-alpha-5 was a "failed release". The only available versions are -4 and
-6.

Wayne

On 8/29/07, siegfried <[EMAIL PROTECTED]> wrote:

I'm trying to follow the instructions at


http://maven.apache.org/guides/plugin/guide-java-plugin-development.html.

Below are the results.



Am I experiencing some problem with the public maven repositories or is

this

a bug in maven 2.0.7? (Or did I do something wrong?)



What would be the wget command to get maven-archetype-creator:jar as the
error message suggests?



Thanks,

Siegfried















cd c:/dev/sandboxes/maven/sample-mojo/

mvn archetype:create \

  -DgroupId=sample.plugin \

  -DartifactId=maven-hello-plugin \

  -DarchetypeGroupId=org.apache.maven.archetypes \

  -DarchetypeArtifactId=maven-archetype-mojo

[INFO] Scanning for projects...

[INFO] Searching repository for plugin with prefix: 'archetype'.

[INFO]


----------------------------------------------------------------------------

[INFO] Building Maven Default Project

[INFO]    task-segment: [archetype:create] (aggregator-style)

[INFO]


----------------------------------------------------------------------------

Downloading:


http://repo1.maven.org/maven2/org/apache/maven/archetype/maven-archetype-cor

e/1.0-alpha-5/maven-archetype-core-1.0-alpha-5.pom

Downloading:


http://repo1.maven.org/maven2/org/apache/maven/archetype/maven-archetype-cor

e/1.0-alpha-5/maven-archetype-core-1.0-alpha-5.pom

Downloading:


http://repo1.maven.org/maven2/org/apache/maven/archetype/maven-archetype-cre

ator/1.0-alpha-5/maven-archetype-creator-1.0-alpha-5.pom

Downloading:


http://repo1.maven.org/maven2/org/apache/maven/archetype/maven-archetype-cre

ator/1.0-alpha-5/maven-archetype-creator-1.0-alpha-5.pom

Downloading:


http://repo1.maven.org/maven2/org/apache/maven/archetype/maven-archetype-cre

ator/1.0-alpha-5/maven-archetype-creator-1.0-alpha-5.jar

Downloading:


http://repo1.maven.org/maven2/org/apache/maven/archetype/maven-archetype-cre

ator/1.0-alpha-5/maven-archetype-creator-1.0-alpha-5.jar

Downloading:


http://repo1.maven.org/maven2/org/apache/maven/archetype/maven-archetype-cor

e/1.0-alpha-5/maven-archetype-core-1.0-alpha-5.jar

Downloading:


http://repo1.maven.org/maven2/org/apache/maven/archetype/maven-archetype-cor

e/1.0-alpha-5/maven-archetype-core-1.0-alpha-5.jar

[INFO]
------------------------------------------------------------------------

[ERROR] BUILD ERROR

[INFO]
------------------------------------------------------------------------

[INFO] Failed to resolve artifact.



Missing:

----------

1) org.apache.maven.archetype:maven-archetype-creator:jar:1.0-alpha-5





  Try downloading the file manually from the project website.





  Then, install it using the command:

      mvn install:install-file -DgroupId=org.apache.maven.archetype
-DartifactId=maven-archetype-creator \

          -Dversion=1.0-alpha-5 -Dpackaging=jar -Dfile=/path/to/file

Alternatively, if you host your own repository you can deploy the file
there:       mvn deploy:deploy-file -DgroupId=org.apache.maven.archetype
-DartifactId=maven-archetype-creator \

          -Dversion=1.0-alpha-5 -Dpackaging=jar -Dfile=/path/to/file \

           -Durl=[url] -DrepositoryId=[id]





  Path to dependency:

            1)
org.apache.maven.plugins:maven-archetype-plugin:maven-plugin:1.0-alpha-6

            2)
org.apache.maven.archetype:maven-archetype-creator:jar:1.0-alpha-5





2) org.apache.maven.archetype:maven-archetype-core:jar:1.0-alpha-5





  Try downloading the file manually from the project website.





  Then, install it using the command:

      mvn install:install-file -DgroupId=org.apache.maven.archetype
-DartifactId=maven-archetype-core \

          -Dversion=1.0-alpha-5 -Dpackaging=jar -Dfile=/path/to/file

Alternatively, if you host your own repository you can deploy the file
there:       mvn deploy:deploy-file -DgroupId=org.apache.maven.archetype
-DartifactId=maven-archetype-core \

          -Dversion=1.0-alpha-5 -Dpackaging=jar -Dfile=/path/to/file \

           -Durl=[url] -DrepositoryId=[id]





  Path to dependency:

            1)
org.apache.maven.plugins:maven-archetype-plugin:maven-plugin:1.0-alpha-6

            2)
org.apache.maven.archetype:maven-archetype-core:jar:1.0-alpha-5





----------

2 required artifacts are missing.



for artifact:



org.apache.maven.plugins:maven-archetype-plugin:maven-plugin:1.0-alpha-6





from the specified remote repositories:

  apache.snapshots

(http://people.apache.org/repo/m2-snapshot-repository),

  central (http://repo1.maven.org/maven2)







[INFO]
------------------------------------------------------------------------

[INFO] For more information, run Maven with the -e switch

[INFO]
------------------------------------------------------------------------

[INFO] Total time: 6 seconds

[INFO] Finished at: Wed Aug 29 13:09:04 MDT 2007

[INFO] Final Memory: 2M/4M

[INFO]
------------------------------------------------------------------------



Compilation exited abnormally with code 1 at Wed Aug 29 13:09:05



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