Hi,
I am following the Guide to Developing Ant Plugins, first example hello
world plugin:
here is the error and at the end of the mail the exact file I
used(cut/paste from the guide):
mvn install
[INFO] Scanning for projects...
[INFO]
----------------------------------------------------------------------------
[INFO] Building Hello Plugin
[INFO] task-segment: [install]
[INFO]
----------------------------------------------------------------------------
[WARNING]
Artifact org.apache.maven:maven-plugin-descriptor:jar:2.0-beta-3
retains local scope 'runtime' overriding broader scope 'compile'
given by a dependency. If this is not intended, modify or remove
the local scope.
[WARNING]
Artifact
org.codehaus.plexus:plexus-container-default:jar:1.0-alpha-7 retains
local scope 'runtime' overriding broader scope 'compile'
given by a dependency. If this is not intended, modify or remove
the local scope.
[WARNING]
Artifact org.apache.maven:maven-plugin-tools-api:jar:2.0-beta-3
retains local scope 'runtime' overriding broader scope 'compile'
given by a dependency. If this is not intended, modify or remove
the local scope.
[INFO] [plugin:descriptor]
[INFO]
----------------------------------------------------------------------------
[ERROR] FATAL ERROR
[INFO]
----------------------------------------------------------------------------
[INFO]
org.apache.maven.tools.plugin.extractor.AbstractScriptedMojoDescriptorExtractor.extractMojoDescriptors(Ljava/util/Map;Lorg/apache/maven/plugin/descriptor/PluginDescriptor;)Ljava/util/List;
[INFO]
----------------------------------------------------------------------------
[INFO] Trace
java.lang.AbstractMethodError:
org.apache.maven.tools.plugin.extractor.AbstractScriptedMojoDescriptorExtractor.extractMojoDescriptors(Ljava/util/Map;Lorg/apache/maven/plugin/descriptor/PluginDescriptor;)Ljava/util/List;
at
org.apache.maven.tools.plugin.extractor.AbstractScriptedMojoDescriptorExtractor.execute(AbstractScriptedMojoDescriptorExtractor.java:34)
at
org.apache.maven.tools.plugin.scanner.DefaultMojoScanner.populatePluginDescriptor(DefaultMojoScanner.java:69)
at
org.apache.maven.plugin.plugin.AbstractGeneratorMojo.execute(AbstractGeneratorMojo.java:95)
at
org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:432)
at
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:530)
at
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalWithLifecycle(DefaultLifecycleExecutor.java:472)
at
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:451)
at
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLifecycleExecutor.java:303)
at
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleExecutor.java:270)
at
org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:139)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:322)
at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:115)
at org.apache.maven.cli.MavenCli.main(MavenCli.java:249)
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:585)
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)
[INFO]
----------------------------------------------------------------------------
[INFO] Total time: 3 seconds
[INFO] Finished at: Fri Jan 20 10:43:32 CET 2006
[INFO] Final Memory: 4M/8M
[INFO] ------------------------------------------------
/hello-plugin$ tree
.
|-- pom.xml
|-- pom.xml~
`-- src
`-- main
`-- script
|-- hello.build.xml
`-- hello.mojos.xml
3 directories, 4 files
/hello-plugin$ cat pom.xml
<project>
<modelVersion>4.0.0</modelVersion>
<groupId>test</groupId>
<artifactId>hello-plugin</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>maven-plugin</packaging>
<name>Hello Plugin</name>
<dependencies>
<dependency>
<groupId>org.apache.maven</groupId>
<artifactId>maven-script-ant</artifactId>
<version>2.0.1</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<!-- NOTE: We don't need groupId if the plugin's groupId is
org.apache.maven.plugins OR org.codehaus.mojo.
We also don't have to specify a version, since Maven can
automatically resolve the newest one.
-->
<artifactId>maven-plugin-plugin</artifactId>
<!-- Add the Ant plugin tools -->
<dependencies>
<dependency>
<groupId>org.apache.maven</groupId>
<artifactId>maven-plugin-tools-ant</artifactId>
<version>2.0.1</version>
</dependency>
</dependencies>
<!-- Tell the plugin-plugin which prefix we will use.
Later, we'll configure Maven to allow us to invoke this
plugin using the "prefix:mojo" shorthand.
-->
<configuration>
<prefix>hello</prefix>
</configuration>
</plugin>
</plugins>
</build>
</project>
/hello-plugin$ cat src/main/script/hello.mojos.xml
<pluginMetadata>
<mojos>
<mojo>
<goal>hello</goal>
<!-- this element refers to the Ant target we'll invoke -->
<call>hello</call>
<description>
Say Hello, World.
</description>
</mojo>
</mojos>
</pluginMetadata>
/hello-plugin$ cat src/main/script/hello.build.xml
<project>
<target name="hello">
<echo>Hello, World</echo>
</target>
</project>
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