Code is listed below. Simple call to ClassDeclaration's getDocComment();

/export/jdk150apt//bin/jar -cf testAPF.jar BasicAPFactory.class testAP$classVisitor.class testAP.class META-INF
Exception caught in classVisitor.visistClassDeclaration calling getDocComment()
java.lang.NullPointerException
        at com.sun.tools.apt.mirror.declaration.DeclarationImpl.getDocComment(DeclarationImpl.java:70)
        at testAP$classVisitor.visitClassDeclaration(BasicAPFactory.java:42)
        at com.sun.tools.apt.mirror.declaration.ClassDeclarationImpl.accept(ClassDeclarationImpl.java:66)
        at testAP.process(BasicAPFactory.java:55)
        at com.sun.mirror.util.CompositeAnnotationProcessor.process(CompositeAnnotationProcessor.java:51)
        at com.sun.tools.apt.comp.Apt.main(Apt.java:305)
        at com.sun.tools.apt.main.JavaCompiler.compile(JavaCompiler.java:416)
        at com.sun.tools.apt.main.Main.compile(Main.java:871)
        at com.sun.tools.apt.main.Main.compile(Main.java:753)
        at com.sun.tools.apt.Main.compile(Main.java:41)
        at com.sun.tools.apt.Main.main(Main.java:32)

-----code---------
import com.sun.mirror.apt.*;
import com.sun.mirror.declaration.*;
import com.sun.mirror.type.*;
import com.sun.mirror.util.*;
import java.util.Collection;
import java.util.Set;

public class BasicAPFactory implements AnnotationProcessorFactory
{
    public Collection<String> supportedOptions() {
return new java.util.HashSet<String>();
    }

    public Collection<String> supportedAnnotationTypes() {
Collection<String> types = new java.util.HashSet<String>();
types.add("*");
return types;
    }

    public AnnotationProcessor getProcessorFor(Set<String> at,
AnnotationProcessorEnvironment env)
   {
return new testAP(env);
    }
}

class testAP implements AnnotationProcessor
{
    private AnnotationProcessorEnvironment env;

    public testAP(AnnotationProcessorEnvironment env)
{
this.env = env;
    }

    static class classVisitor extends DeclarationScanner
{
public void visitClassDeclaration(ClassDeclaration d)
{
super.visitClassDeclaration(d);
try{
String comments = d.getDocComment();
}
catch(Throwable t) {
System.out.println("Exception caught in classVisitor.visistClassDeclaration calling getDocComment()");
t.printStackTrace();
}

}
    }

    public void process()
{
        for (TypeDeclaration typedecl: env.getSpecifiedTypeDeclarations())
            typedecl.accept(new classVisitor());
    }
}