Hi,
I am getting a strange error when I try to create the simple Maven
Hello Plugin example. When compiling it, I get the message: "Cannot
read file: GreetingMojo.java" (Detailed error message is below).
I don't get any error when I just change the <packaging> from
maven-plugin to jar.
Any ideas what the issue could be?
Thanks for your help!
-Alexander
I copied the examples from the Maven2 documentation:
GreetingMojo.java:
----------------------------------------------------------------------------
package sample;
import org.apache.maven.plugin.AbstractMojo;
import org.apache.maven.plugin.MojoExecutionException;
/**
* @goal sayhi
* @description Says "Hi" to the user
*/
public class GreetingMojo extends AbstractMojo
{
public void execute() throws MojoExecutionException
{
getLog().info("Hello, world.");
}
}
--------------------------------------------------------------------------
pom.xml:
-------------------------------------------------------------------------
<project>
<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>
</project>
----------------------------------------------------------------------------------------
C:\D\test\temp>mvn compile
[INFO] Scanning for projects...
[INFO]
-------------------------------------------------------------------------
---
[INFO] Building Sample Parameter-less Maven Plugin
[INFO] task-segment: [compile]
[INFO]
-------------------------------------------------------------------------
---
[INFO] [plugin:descriptor]
[INFO] Using 2 extractors.
[INFO] Applying extractor for language: java
[INFO]
------------------------------------------------------------------------
[ERROR] FATAL ERROR
[INFO]
------------------------------------------------------------------------
[INFO] Cannot read file : GreetingMojo.java
[INFO]
------------------------------------------------------------------------
[INFO] Trace
java.lang.RuntimeException: Cannot read file : GreetingMojo.java
at
com.thoughtworks.qdox.JavaDocBuilder$1.visitFile(JavaDocBuilder.java:
369)
at
com.thoughtworks.qdox.directorywalker.DirectoryScanner.walk(Directory
Scanner.java:43)
at
com.thoughtworks.qdox.directorywalker.DirectoryScanner.walk(Directory
Scanner.java:34)
at
com.thoughtworks.qdox.directorywalker.DirectoryScanner.walk(Directory
Scanner.java:34)
at
com.thoughtworks.qdox.directorywalker.DirectoryScanner.scan(Directory
Scanner.java:52)
at
com.thoughtworks.qdox.JavaDocBuilder.addSourceTree(JavaDocBuilder.jav
a:362)
at
org.apache.maven.tools.plugin.extractor.java.JavaMojoDescriptorExtrac
tor.execute(JavaMojoDescriptorExtractor.java:477)
at
org.apache.maven.tools.plugin.scanner.DefaultMojoScanner.populatePlug
inDescriptor(DefaultMojoScanner.java:69)
at
org.apache.maven.plugin.plugin.AbstractGeneratorMojo.execute(Abstract
GeneratorMojo.java:99)
at
org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPlugi
nManager.java:412)
at
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(Defa
ultLifecycleExecutor.java:534)
at
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalWithLi
fecycle(DefaultLifecycleExecutor.java:475)
at
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(Defau
ltLifecycleExecutor.java:454)
at
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHan
dleFailures(DefaultLifecycleExecutor.java:306)
at
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegmen
ts(DefaultLifecycleExecutor.java:273)
at
org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLi
fecycleExecutor.java:140)
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:256)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.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: 2 seconds
[INFO] Finished at: Fri Jul 14 17:54:06 CEST 2006
[INFO] Final Memory: 3M/8M
[INFO]
------------------------------------------------------------------------
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