Maven2 plugin classloader and annotations

[Michel Goldstein]

Hi,

I've been having some problems with using plugins to generate extra  
artifacts based on annotations in some classes. Simply the plugin  
hasn't been able to read any annotations from a class loaded using an  
URLClassLoader. For example:

Outside a plugin:

public class NoPlugin
{
    public static void main( String[] args )
    {
        try {
            File f = new File("/workplace/java-studies/annotations- 
bug/annotation-direct/target/annotation-direct-1.0-SNAPSHOT.jar");
            URLClassLoader cload = new URLClassLoader(new URL[] 
{f.toURL()},ClassLoader.getSystemClassLoader());
            Class cl = cload.loadClass("InterfaceToUse");
            Method m = cl.getMethod("interface1");
            System.out.println("Annotation is present? " +  
m.isAnnotationPresent(MyAnnotation.class));
        } catch (Exception e) {
            System.out.println("Exception: " + e.getMessage());
        }
    }
}

The result is:

Annotation is present? true

Now inside a plugin:

public class TestMojo extends AbstractMojo
{
    public void execute() throws MojoExecutionException
    {
        try {
            File f = new File("/workplace/java-studies/annotations- 
bug/annotation-direct/target/annotation-direct-1.0-SNAPSHOT.jar");
            URLClassLoader cload = new URLClassLoader(new URL[] 
{f.toURL()},ClassLoader.getSystemClassLoader());
            Class cl = cload.loadClass("InterfaceToUse");
            Method m = cl.getMethod("interface1");
            getLog().info("Annotation is present? " +  
m.isAnnotationPresent(MyAnnotation.class));
        } catch (Exception e) {
            getLog().error("Exception: " + e.getMessage());
        }
    }
}

The result is:

Annotation is present? false

Is there anything I'm missing here?

Thank you,
Michel

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