I'm doing some experiments with Doclets. I'm using Java 7 and Maven.
My pom.xml is:
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>betlista</groupId>
    <artifactId>tests-javadoc</artifactId>
    <version>1.0.0-SNAPSHOT</version>
    <dependencies>
        <dependency>
            <groupId>sun.jdk</groupId>
            <artifactId>tools</artifactId>
            <version>1.5.0</version>
            <scope>system</scope>
            <systemPath>${java.home}/../lib/tools.jar</systemPath>
        </dependency>
    </dependencies>
</project>
My doclet is:
package betlista.tests.javadoc;
import com.sun.javadoc.ClassDoc;
import com.sun.javadoc.MethodDoc;
import com.sun.javadoc.RootDoc;
public class MyDoclet {
    public static boolean start(RootDoc root) {
        ClassDoc[] classes = root.classes();
        for (ClassDoc classDoc : classes) {
            processClass(classDoc);
        }
        return true;
    }
    private static void processClass(ClassDoc classDoc) {
        MethodDoc[] methods = classDoc.methods();
        for (MethodDoc methodDoc : methods) {
            processMethod(methodDoc);
        }
    }
    private static void processMethod(MethodDoc methodDoc) {
        System.out.println(methodDoc);
    }
    public static void main(String[] args) {
        String[] params = new String[] {
                "-private",
                //"-docletpath", "c:\\betlista\\CAMS\\SVN\\cams\\trunk\\CamsSwaggerGenerator\\target\\classes",
                "-doclet", "betlista.tests.javadoc.MyDoclet",
                "-sourcepath", "C:\\betlista\\other\\sts_3.6.1_e4.4_ws\\tests-javadoc\\src\\main\\java",
                "betlista.tests.javadoc"
        };
        com.sun.tools.javadoc.Main.execute(params);
    }
}
and my class I'm trying to process with doclet is
package betlista.tests.javadoc;
/**
 * My perfect class
 * 
 * @author me
 */
public class ClassToProcess {
    /**
     * My cool method.
     */
    private void foo() {
    }
}
According to my understanding "My cool method." should be a first sentence, but in debug there is a null value when I have breakpoint in MyDoclet's processMethod():

Some ideas what I missed?
note: I just tried with
<version>1.7.0</version>
and no change...
                        
You missed the point after the class description.