Invoking a plugin programmatically using maven 3 and scala

Wed, 13 Oct 2010 00:28:16 -0700 


 Hello Maveners ,
mainly for self learning purposes I am trying to build some plugins for Maven 3 using the Scala language. One of the things I had going before (Maven 2 & Java based) is to invoke another plugin programmatically.
Now I am trying to invoke the dependency plugin, namely the unpack-dependencies goal and am running 
into a rather cryptic error message:
[ERROR] Failed to execute goal com.progress.maven.plugins:plugin-sandbox:8.0-SNAPSHOT:echo (default-cli) on project test-plugin: The parameters 'proje ct', 'local', 'remoteRepos', 'reactorProjects' for goal org.apache.maven.plugins:maven-dependency-plugin:2.1:unpack-dependencies are missing or invali 
d -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal com.progress.maven.plugins:plugin-sandbox:8.0-SNAPSHOT:echo (default-cl i) on project test-plugin: The parameters 'project', 'local', 'remoteRepos', 'reactorProjects' for goal org.apache.maven.plugins:maven-dependency-plugin:2.1:unpack-dependencies are missing or invalid at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:157) at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:88) at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:80) at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:87) at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59) at org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183) at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161) 
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:315)
        at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:152)
        at org.apache.maven.cli.MavenCli.execute(MavenCli.java:445)
        at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:168)
        at org.apache.maven.cli.MavenCli.main(MavenCli.java:132)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 
        at java.lang.reflect.Method.invoke(Method.java:597)
at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:290) at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:230) at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:409) at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:352) Caused by: org.apache.maven.plugin.PluginParameterException: The parameters 'project', 'local', 'remoteRepos', 'reactorProjects' for goal org.apache.maven.plugins:maven-dependency-plugin:2.1:unpack-dependencies are missing or invalid at org.apache.maven.plugin.internal.DefaultMavenPluginManager.populatePluginFields(DefaultMavenPluginManager.java:514) at org.apache.maven.plugin.internal.DefaultMavenPluginManager.getConfiguredMojo(DefaultMavenPluginManager.java:467) at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:96) 
        at de.woq.maven.plugins.TestMojo.execute(TestMojo.scala:109)
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:107) at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145) 
        ... 19 more
It seems that the current project is not passed correctly to the plugin. I have noticed that the API for invoking plugins has slightly changed, but was unable to get more information. 
Any hints where to dig deeper would be greatly appreciated.
For completeness here is the code of my plugin so far .... (As I said its a learning exercise :)) 

/*
 * Copyright (C) 2010, Way of Quality
 * All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package de.woq.maven.plugins

import org.apache.maven.plugin._
import descriptor.MojoDescriptor
import org.scala_tools.maven.mojo.annotations._
import org.apache.maven.project.MavenProject
import org.apache.maven.execution.MavenSession
import org.apache.maven.model.Plugin

import scala.collection.JavaConversions._
import org.codehaus.plexus.component.annotations.Requirement
import org.codehaus.plexus.util.xml.Xpp3Dom

@goal("echo")
@phase("process-sources")
@requiresProject
class TestMojo extends AbstractMojo {

  @readOnly @parameter @expression("${project}")
  var project : MavenProject = _

  @readOnly @parameter @expression("${session}")
  var session : MavenSession = _

  @Requirement
  var pluginManager: BuildPluginManager = _
private def getBuildPlugin(groupId: String, artifactId: String, version: Option[String]) = {
List.fromIterator(project.getBuildPlugins.iterator).asInstanceOf[List[Plugin]] 
      .filter(
p => (p.getGroupId.equals(groupId)) && (p.getArtifactId.equals(artifactId) && (version == None || p.getVersion.equals(version))) 
      )
  }

  def resolvePluginManager = {
session.getContainer.lookup("org.apache.maven.plugin.BuildPluginManager").asInstanceOf[BuildPluginManager] 
  }

  def buildConfiguration(params: Map[String, String]): Xpp3Dom = {
    var config = new Xpp3Dom("configuration")

    for{
      key <- params.keys
      value = params.get(key)
    } {
      var child = new Xpp3Dom(key)
      child.setValue(
        params.get(key) match {
          case Some(v) => v
          case None => ""
        }
      )
      config.addChild(child)
    }

    println(config.toUnescapedString)
    config
  }

  override def execute = {
val plugins = getBuildPlugin("org.apache.maven.plugins", "maven-dependency-plugin", None) assert(plugins.length == 1, "Found " + plugins.length + " plugins for dependdency resolution, expected 1") 

    val dep: Plugin = plugins.head

    getLog.info("==============================")
// needed as component injection seems to be broken in scala plugins ... 
    pluginManager = resolvePluginManager

    assert(project != null)
    assert(session != null)
    assert(pluginManager != null)
var config : Xpp3Dom = buildConfiguration(Map("outputDirectory" -> "test")) 

    var md : MojoDescriptor = pluginManager.getMojoDescriptor(
dep, "unpack-dependencies", project.getRemotePluginRepositories, session.getRepositorySession 
    )

    var execution : MojoExecution = new MojoExecution(md, config)

    assert(md != null)
pluginManager.executeMojo(session, execution) // <==== fails here .... 

    getLog.info("==============================")
  }
}


Thanks and best regards
Andreas

Reply via email to