As shown in in this simple example. APT takes an invalid TypeParameter and causes 'StackOverflowError'.
it was only at 5 th iteration of Visitor.

How to reproduce this case.
--------------------------
bash-3.00$ cat CaseAP.java
import java.util.*;
import javax.annotation.processing.*;
import javax.lang.model.element.*;
import javax.lang.model.type.*;
import javax.lang.model.util.*;
import static javax.lang.model.SourceVersion.*;
import static javax.lang.model.type.TypeKind.*;

@SupportedAnnotationTypes("*")
@SupportedSourceVersion(RELEASE_6)
@SupportedOptions("-verbose")
public class CaseAP extends AbstractProcessor {
    public void init(ProcessingEnvironment penv) {
        super.init(penv);
    }
    public static Types types;
    public static Types getTypes() {
        return types;
    }
    public boolean process(Set<? extends TypeElement> typeElementSet,
            RoundEnvironment renv) {
        if ( renv.errorRaised()) {
            System.out.println(" ******* Error raised ... ");
            return false;
        }
        Elements elementUtils = processingEnv.getElementUtils();
        types = processingEnv.getTypeUtils();
        Vector<TypeMirror> listArrayElementList = new Vector<TypeMirror>();
        Void p = null;
        SimpleTypeMirrorVisitor typeVisitor = new SimpleTypeMirrorVisitor();
        for( TypeElement element : renv.getSpecifiedTypeElements()) {
            List<? extends Element > list = element.getEnclosedElements();
            for( Element e : list) {
                if (e instanceof TypeElement ) {
                    TypeElement te = (TypeElement) e;
                    te.asType().accept(typeVisitor, p);
                    List<? extends TypeParameterElement> list_ = te.getTypeParameters();
                    for(TypeParameterElement tpe : list_) {
                        tpe.getGenericElement().asType().accept(typeVisitor,p);
                        List<? extends TypeMirror> types = tpe.getBounds();
                        for(TypeMirror tm : types) {
                            tm.accept(typeVisitor,p);
                        }
                    }
                }
            }
            element.asType().accept(typeVisitor,p);
        }
        return true ;
    }
}
class SimpleTypeMirrorVisitor extends SimpleTypeVisitor6 <Void, Void> {
    private static int counter=0;
    protected Void defaultAction(TypeMirror mirror, Void p ) {
        List <? extends TypeMirror> list = CaseAP.getTypes().directSupertypes(mirror);
        for(TypeMirror tm : list) {
            if ( tm != null ) {
                tm.accept(this,p);
            }
        }
        counter++;
        System.out.println(" visited for = "+counter);
        return p;
    }
}
bash-3.00$ cat Case1.java
import java.util.Vector;
import java.io.*;
public class Case1 {
    private String message;
    private int intI;
    private float floatF;

    class MyInnerClass <T extends Case12> {
        public T myT;
        public T getMyT() {
            return myT;

        }

    }

}
bash-3.00$ ksh compile.sh
Case1.java:8: cannot find symbol
symbol : class Case12
location: class Case1
    class MyInnerClass <T extends Case12> {
                                  ^
 visited for = 1
 visited for = 2
 visited for = 3
 visited for = 4


An annotation processor threw an uncaught exception.
Consult the following stack trace for details.
java.lang.StackOverflowError
        at com.sun.tools.javac.code.Types$UnaryVisitor.visit(Types.java:2924)
        at com.sun.tools.javac.code.Types.supertype(Types.java:1510)
        at com.sun.tools.javac.model.JavacTypes.directSupertypes(JavacTypes.java:90)
        at SimpleTypeMirrorVisitor.defaultAction(CaseAP.java:55)
        at SimpleTypeMirrorVisitor.defaultAction(CaseAP.java:52)
        at javax.lang.model.util.SimpleTypeVisitor6.visitError(SimpleTypeVisitor6.java:155)
        at com.sun.tools.javac.code.Type$ErrorType.accept(Type.java:1155)
        at SimpleTypeMirrorVisitor.defaultAction(CaseAP.java:58)
        at SimpleTypeMirrorVisitor.defaultAction(CaseAP.java:52)
        at javax.lang.model.util.SimpleTypeVisitor6.visitError(SimpleTypeVisitor6.java:155)
        at com.sun.tools.javac.code.Type$ErrorType.accept(Type.java:1155)
        at SimpleTypeMirrorVisitor.defaultAction(CaseAP.java:58)
        at SimpleTypeMirrorVisitor.defaultAction(CaseAP.java:52)
        at javax.lang.model.util.SimpleTypeVisitor6.visitError(SimpleTypeVisitor6.java:155)^C at com.sun.tools.javac.code.Type$ErrorType.accept(Type.java:1155)
        at SimpleTypeMirrorVisitor.defaultAction(CaseAP.java:58)
        at SimpleTypeMirrorVisitor.defaultAction(CaseAP.java:52)
        at javax.lang.model.util.SimpleTypeVisitor6.visitError(SimpleTypeVisitor6.java:155)
        at com.sun.tools.javac.code.Type$ErrorType.accept(Type.java:1155)
        at SimpleTypeMirrorVisitor.defaultAction(CaseAP.java:58)
        at SimpleTypeMirrorVisitor.defaultAction(CaseAP.java:52)
        at javax.lang.model.util.SimpleTypeVisitor6.visitError(SimpleTypeVisitor6.java:155)
        at com.sun.tools.javac.code.Type$ErrorType.accept(Type.java:1155)
        at SimpleTypeMirrorVisitor.defaultAction(CaseAP.java:58)
        at SimpleTypeMirrorVisitor.defaultAction(CaseAP.java:52)
        at javax.lang.model.util.SimpleTypeVisitor6.visitError(SimpleTypeVisitor6.java:155)
        at com.sun.tools.javac.code.Type$ErrorType.accept(Type.java:1155)
        at SimpleTypeMirrorVisitor.defaultAction(CaseAP.java:58)
        at SimpleTypeMirrorVisitor.defaultAction(CaseAP.java:52)
        at javax.lang.model.util.SimpleTypeVisitor6.visitError(SimpleTypeVisitor6.java:155)
        at com.sun.tools.javac.code.Type$ErrorType.accept(Type.java:1155)
        at SimpleTypeMirrorVisitor.defaultAction(CaseAP.java:58)
        at SimpleTypeMirrorVisitor.defaultAction(CaseAP.java:52)
.....