Goal "files" doesn't work with maven-2.2.1

[anomen-s]

I tried simple use of "files" goal, but I was not able to make it work with maven-2.2.1. In maven-3.0+, this works fine:

<build>
<plugins>
<plugin>
  <groupId>net.ju-n.maven.plugins</groupId>
  <artifactId>checksum-maven-plugin</artifactId>
  <version>1.3</version>
  <executions>
   <execution>
   <phase>process-resources</phase>
  <goals>
   <goal>files</goal>
  </goals>
  <configuration>
    <algorithms>
      <algorithm>MD5</algorithm>
    </algorithms>
    <quiet>true</quiet>
    <fileSets>
      <fileSet>
        <directory>${project.build.directory}/custom/statechart/data</directory>
      </fileSet>
    </fileSets>
  </configuration>
</execution>
</executions>
</plugin>

[DEBUG] Configuring mojo 'net.ju-n.maven.plugins:checksum-maven-plugin:1.3:files' -->
[DEBUG]   (f) algorithms = [MD5]
[DEBUG]   (f) attachChecksums = false
[DEBUG]   (f) csvSummary = true
[DEBUG]   (f) csvSummaryFile = checksums.csv
[DEBUG]   (f) encoding = UTF-8
[DEBUG]   (f) failOnError = true
[INFO] ------------------------------------------------------------------------
[ERROR] BUILD ERROR
[INFO] ------------------------------------------------------------------------
[INFO] Failed to configure plugin parameters for: net.ju-n.maven.plugins:checksum-maven-plugin:1.3



Cause: Error loading class 'net.nicoulaj.maven.plugins.checksum.mojo.FileSet'
[INFO] ------------------------------------------------------------------------
[DEBUG] Trace
org.apache.maven.lifecycle.LifecycleExecutionException: Error configuring: net.ju-n.maven.plugins:checksum-maven-plugin. Reason: Unable to parse the created DOM for plugin configuration
    at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:723)
    at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalWithLifecycle(DefaultLifecycleExecutor.java:556)
    at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:535)
    at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLifecycleExecutor.java:387)
    at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleExecutor.java:348)
    at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:180)
    at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:328)
    at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:138)
    at org.apache.maven.cli.MavenCli.main(MavenCli.java:362)
    at org.apache.maven.cli.compat.CompatibleMain.main(CompatibleMain.java:60)
    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.classworlds.Launcher.launchEnhanced(Launcher.java:315)
    at org.codehaus.classworlds.Launcher.launch(Launcher.java:255)
    at org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:430)
    at org.codehaus.classworlds.Launcher.main(Launcher.java:375)
Caused by: org.apache.maven.plugin.PluginConfigurationException: Error configuring: net.ju-n.maven.plugins:checksum-maven-plugin. Reason: Unable to parse the created DOM for plugin configuration
    at org.apache.maven.plugin.DefaultPluginManager.populatePluginFields(DefaultPluginManager.java:1363)
    at org.apache.maven.plugin.DefaultPluginManager.getConfiguredMojo(DefaultPluginManager.java:724)
    at org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:468)
    at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:694)
    ... 17 more
Caused by: org.codehaus.plexus.component.configurator.ComponentConfigurationException: Error loading class 'net.nicoulaj.maven.plugins.checksum.mojo.FileSet'
    at org.codehaus.plexus.component.configurator.converters.composite.CollectionConverter.fromConfiguration(CollectionConverter.java:170)
    at org.codehaus.plexus.component.configurator.converters.ComponentValueSetter.configure(ComponentValueSetter.java:247)
    at org.codehaus.plexus.component.configurator.converters.composite.ObjectWithFieldsConverter.processConfiguration(ObjectWithFieldsConverter.java:137)
    at org.codehaus.plexus.component.configurator.BasicComponentConfigurator.configureComponent(BasicComponentConfigurator.java:56)
    at org.apache.maven.plugin.DefaultPluginManager.populatePluginFields(DefaultPluginManager.java:1357)
    ... 20 more
Caused by: java.lang.ClassNotFoundException: net.nicoulaj.maven.plugins.checksum.mojo.FileSet
    at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
    at org.codehaus.classworlds.RealmClassLoader.loadClassDirect(RealmClassLoader.java:195)
    at org.codehaus.classworlds.DefaultClassRealm.loadClass(DefaultClassRealm.java:255)
    at org.codehaus.classworlds.DefaultClassRealm.loadClass(DefaultClassRealm.java:274)
    at org.codehaus.classworlds.RealmClassLoader.loadClass(RealmClassLoader.java:214)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
    at org.codehaus.plexus.component.configurator.converters.composite.CollectionConverter.fromConfiguration(CollectionConverter.java:158)
    ... 24 more

[nicoulaj]

Indeed, the plugin does not support maven 2 anymore.

I set the minimum required version to Maven 3.0.4, so now it will fail with the right message:

[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 1.217s
[INFO] Finished at: Fri Nov 18 22:45:52 CET 2016
[INFO] Final Memory: 27M/271M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal net.ju-n.maven.plugins:checksum-maven-plugin:1.4-SNAPSHOT:artifacts (default) on project attached-artifacts.artifacts.xml-summary-file: The plugin net.ju-n.maven.plugins:checksum-maven-plugin:1.4-SNAPSHOT requires Maven version 3.2.0 -> [Help 1]

I configured the continuous integration to test all Maven versions since 3.0.4 on JDK 6/7/8: https://travis-ci.org/nicoulaj/checksum-maven-plugin