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	/*
	* Copyright (c) 1997, 2021, Oracle and/or its affiliates. All rights reserved.
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle in the LICENSE file that accompanied this code.
	*
	* This code is distributed in the hope that it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/

	package java.lang.reflect;

	import java.lang.annotation.Annotation;
	import java.lang.invoke.MethodHandle;
	import java.lang.ref.WeakReference;
	import java.security.AccessController;

	import jdk.internal.access.SharedSecrets;
	import jdk.internal.misc.VM;
	import jdk.internal.reflect.CallerSensitive;
	import jdk.internal.reflect.Reflection;
	import jdk.internal.reflect.ReflectionFactory;
	import sun.security.action.GetPropertyAction;
	import sun.security.util.SecurityConstants;

	/**
	* The {@code AccessibleObject} class is the base class for {@code Field},
	* {@code Method}, and {@code Constructor} objects (known as <em>reflected
	* objects</em>). It provides the ability to flag a reflected object as
	* suppressing checks for Java language access control when it is used. This
	* permits sophisticated applications with sufficient privilege, such as Java
	* Object Serialization or other persistence mechanisms, to manipulate objects
	* in a manner that would normally be prohibited.
	*
	* <p> Java language access control prevents use of private members outside
	* their top-level class; package access members outside their package; protected members
	* outside their package or subclasses; and public members outside their
	* module unless they are declared in an {@link Module#isExported(String,Module)
	* exported} package and the user {@link Module#canRead reads} their module. By
	* default, Java language access control is enforced (with one variation) when
	* {@code Field}s, {@code Method}s, or {@code Constructor}s are used to get or
	* set fields, to invoke methods, or to create and initialize new instances of
	* classes, respectively. Every reflected object checks that the code using it
	* is in an appropriate class, package, or module. The check when invoked by
	* <a href="{@docRoot}/../specs/jni/index.html">JNI code</a> with no Java
	* class on the stack only succeeds if the member and the declaring class are
	* public, and the class is in a package that is exported to all modules. </p>
	*
	* <p> The one variation from Java language access control is that the checks
	* by reflected objects assume readability. That is, the module containing
	* the use of a reflected object is assumed to read the module in which
	* the underlying field, method, or constructor is declared. </p>
	*
	* <p> Whether the checks for Java language access control can be suppressed
	* (and thus, whether access can be enabled) depends on whether the reflected
	* object corresponds to a member in an exported or open package
	* (see {@link #setAccessible(boolean)}). </p>
	*
	* @jls 6.6 Access Control
	* @since 1.2
	* @revised 9
	*/
	public class AccessibleObject implements AnnotatedElement {
	static {
	// AccessibleObject is initialized early in initPhase1
	SharedSecrets.setJavaLangReflectAccess(new ReflectAccess());
	}

	static void checkPermission() {
	@SuppressWarnings("removal")
	SecurityManager sm = System.getSecurityManager();
	if (sm != null) {
	// SecurityConstants.ACCESS_PERMISSION is used to check
	// whether a client has sufficient privilege to defeat Java
	// language access control checks.
	sm.checkPermission(SecurityConstants.ACCESS_PERMISSION);
	}
	}

	/**
	* Convenience method to set the {@code accessible} flag for an
	* array of reflected objects with a single security check (for efficiency).
	*
	* <p> This method may be used to enable access to all reflected objects in
	* the array when access to each reflected object can be enabled as
	* specified by {@link #setAccessible(boolean) setAccessible(boolean)}. </p>
	*
	* <p>If there is a security manager, its
	* {@code checkPermission} method is first called with a
	* {@code ReflectPermission("suppressAccessChecks")} permission.
	*
	* <p>A {@code SecurityException} is also thrown if any of the elements of
	* the input {@code array} is a {@link java.lang.reflect.Constructor}
	* object for the class {@code java.lang.Class} and {@code flag} is true.
	*
	* @param array the array of AccessibleObjects
	* @param flag the new value for the {@code accessible} flag
	* in each object
	* @throws InaccessibleObjectException if access cannot be enabled for all
	* objects in the array
	* @throws SecurityException if the request is denied by the security manager
	* or an element in the array is a constructor for {@code
	* java.lang.Class}
	* @see SecurityManager#checkPermission
	* @see ReflectPermission
	* @revised 9
	*/
	@CallerSensitive
	public static void setAccessible(AccessibleObject[] array, boolean flag) {
	checkPermission();
	if (flag) {
	Class<?> caller = Reflection.getCallerClass();
	array = array.clone();
	for (AccessibleObject ao : array) {
	ao.checkCanSetAccessible(caller);
	}
	}
	for (AccessibleObject ao : array) {
	ao.setAccessible0(flag);
	}
	}

	/**
	* Set the {@code accessible} flag for this reflected object to
	* the indicated boolean value. A value of {@code true} indicates that
	* the reflected object should suppress checks for Java language access
	* control when it is used. A value of {@code false} indicates that
	* the reflected object should enforce checks for Java language access
	* control when it is used, with the variation noted in the class description.
	*
	* <p> This method may be used by a caller in class {@code C} to enable
	* access to a {@link Member member} of {@link Member#getDeclaringClass()
	* declaring class} {@code D} if any of the following hold: </p>
	*
	* <ul>
	* <li> {@code C} and {@code D} are in the same module. </li>
	*
	* <li> The member is {@code public} and {@code D} is {@code public} in
	* a package that the module containing {@code D} {@link
	* Module#isExported(String,Module) exports} to at least the module
	* containing {@code C}. </li>
	*
	* <li> The member is {@code protected} {@code static}, {@code D} is
	* {@code public} in a package that the module containing {@code D}
	* exports to at least the module containing {@code C}, and {@code C}
	* is a subclass of {@code D}. </li>
	*
	* <li> {@code D} is in a package that the module containing {@code D}
	* {@link Module#isOpen(String,Module) opens} to at least the module
	* containing {@code C}.
	* All packages in unnamed and open modules are open to all modules and
	* so this method always succeeds when {@code D} is in an unnamed or
	* open module. </li>
	* </ul>
	*
	* <p> This method cannot be used to enable access to private members,
	* members with default (package) access, protected instance members, or
	* protected constructors when the declaring class is in a different module
	* to the caller and the package containing the declaring class is not open
	* to the caller's module. </p>
	*
	* <p> This method cannot be used to enable {@linkplain Field#set <em>write</em>}
	* access to a <em>non-modifiable</em> final field. The following fields
	* are non-modifiable:
	* <ul>
	* <li>static final fields declared in any class or interface</li>
	* <li>final fields declared in a {@linkplain Class#isHidden() hidden class}</li>
	* <li>final fields declared in a {@linkplain Class#isRecord() record}</li>
	* </ul>
	* <p> The {@code accessible} flag when {@code true} suppresses Java language access
	* control checks to only enable {@linkplain Field#get <em>read</em>} access to
	* these non-modifiable final fields.
	*
	* <p> If there is a security manager, its
	* {@code checkPermission} method is first called with a
	* {@code ReflectPermission("suppressAccessChecks")} permission.
	*
	* @param flag the new value for the {@code accessible} flag
	* @throws InaccessibleObjectException if access cannot be enabled
	* @throws SecurityException if the request is denied by the security manager
	* @see #trySetAccessible
	* @see java.lang.invoke.MethodHandles#privateLookupIn
	* @revised 9
	*/
	@CallerSensitive // overrides in Method/Field/Constructor are @CS
	public void setAccessible(boolean flag) {
	AccessibleObject.checkPermission();
	setAccessible0(flag);
	}

	/**
	* Sets the accessible flag and returns the new value
	*/
	boolean setAccessible0(boolean flag) {
	this.override = flag;
	return flag;
	}

	/**
	* Set the {@code accessible} flag for this reflected object to {@code true}
	* if possible. This method sets the {@code accessible} flag, as if by
	* invoking {@link #setAccessible(boolean) setAccessible(true)}, and returns
	* the possibly-updated value for the {@code accessible} flag. If access
	* cannot be enabled, i.e. the checks or Java language access control cannot
	* be suppressed, this method returns {@code false} (as opposed to {@code
	* setAccessible(true)} throwing {@code InaccessibleObjectException} when
	* it fails).
	*
	* <p> This method is a no-op if the {@code accessible} flag for
	* this reflected object is {@code true}.
	*
	* <p> For example, a caller can invoke {@code trySetAccessible}
	* on a {@code Method} object for a private instance method
	* {@code p.T::privateMethod} to suppress the checks for Java language access
	* control when the {@code Method} is invoked.
	* If {@code p.T} class is in a different module to the caller and
	* package {@code p} is open to at least the caller's module,
	* the code below successfully sets the {@code accessible} flag
	* to {@code true}.
	*
	* <pre>
	* {@code
	* p.T obj = ....; // instance of p.T
	* :
	* Method m = p.T.class.getDeclaredMethod("privateMethod");
	* if (m.trySetAccessible()) {
	* m.invoke(obj);
	* } else {
	* // package p is not opened to the caller to access private member of T
	* ...
	* }
	* }</pre>
	*
	* <p> If there is a security manager, its {@code checkPermission} method
	* is first called with a {@code ReflectPermission("suppressAccessChecks")}
	* permission. </p>
	*
	* @return {@code true} if the {@code accessible} flag is set to {@code true};
	* {@code false} if access cannot be enabled.
	* @throws SecurityException if the request is denied by the security manager
	*
	* @since 9
	* @see java.lang.invoke.MethodHandles#privateLookupIn
	*/
	@CallerSensitive
	public final boolean trySetAccessible() {
	AccessibleObject.checkPermission();

	if (override == true) return true;

	// if it's not a Constructor, Method, Field then no access check
	if (!Member.class.isInstance(this)) {
	return setAccessible0(true);
	}

	// does not allow to suppress access check for Class's constructor
	Class<?> declaringClass = ((Member) this).getDeclaringClass();
	if (declaringClass == Class.class && this instanceof Constructor) {
	return false;
	}

	if (checkCanSetAccessible(Reflection.getCallerClass(),
	declaringClass,
	false)) {
	return setAccessible0(true);
	} else {
	return false;
	}
	}


	/**
	* If the given AccessibleObject is a {@code Constructor}, {@code Method}
	* or {@code Field} then checks that its declaring class is in a package
	* that can be accessed by the given caller of setAccessible.
	*/
	void checkCanSetAccessible(Class<?> caller) {
	// do nothing, needs to be overridden by Constructor, Method, Field
	}

	final void checkCanSetAccessible(Class<?> caller, Class<?> declaringClass) {
	checkCanSetAccessible(caller, declaringClass, true);
	}

	private boolean checkCanSetAccessible(Class<?> caller,
	Class<?> declaringClass,
	boolean throwExceptionIfDenied) {
	if (caller == MethodHandle.class) {
	throw new IllegalCallerException(); // should not happen
	}

	Module callerModule = caller.getModule();
	Module declaringModule = declaringClass.getModule();

	if (callerModule == declaringModule) return true;
	if (callerModule == Object.class.getModule()) return true;
	if (!declaringModule.isNamed()) return true;

	String pn = declaringClass.getPackageName();
	int modifiers;
	if (this instanceof Executable) {
	modifiers = ((Executable) this).getModifiers();
	} else {
	modifiers = ((Field) this).getModifiers();
	}

	// class is public and package is exported to caller
	boolean isClassPublic = Modifier.isPublic(declaringClass.getModifiers());
	if (isClassPublic && declaringModule.isExported(pn, callerModule)) {
	// member is public
	if (Modifier.isPublic(modifiers)) {
	return true;
	}

	// member is protected-static
	if (Modifier.isProtected(modifiers)
	&& Modifier.isStatic(modifiers)
	&& isSubclassOf(caller, declaringClass)) {
	return true;
	}
	}

	// package is open to caller
	if (declaringModule.isOpen(pn, callerModule)) {
	return true;
	}

	if (throwExceptionIfDenied) {
	// not accessible
	String msg = "Unable to make ";
	if (this instanceof Field)
	msg += "field ";
	msg += this + " accessible: " + declaringModule + " does not \"";
	if (isClassPublic && Modifier.isPublic(modifiers))
	msg += "exports";
	else
	msg += "opens";
	msg += " " + pn + "\" to " + callerModule;
	InaccessibleObjectException e = new InaccessibleObjectException(msg);
	if (printStackTraceWhenAccessFails()) {
	e.printStackTrace(System.err);
	}
	throw e;
	}
	return false;
	}

	private boolean isSubclassOf(Class<?> queryClass, Class<?> ofClass) {
	while (queryClass != null) {
	if (queryClass == ofClass) {
	return true;
	}
	queryClass = queryClass.getSuperclass();
	}
	return false;
	}

	/**
	* Returns a short descriptive string to describe this object in log messages.
	*/
	String toShortString() {
	return toString();
	}

	/**
	* Get the value of the {@code accessible} flag for this reflected object.
	*
	* @return the value of the object's {@code accessible} flag
	*
	* @deprecated
	* This method is deprecated because its name hints that it checks
	* if the reflected object is accessible when it actually indicates
	* if the checks for Java language access control are suppressed.
	* This method may return {@code false} on a reflected object that is
	* accessible to the caller. To test if this reflected object is accessible,
	* it should use {@link #canAccess(Object)}.
	*
	* @revised 9
	*/
	@Deprecated(since="9")
	public boolean isAccessible() {
	return override;
	}

	/**
	* Test if the caller can access this reflected object. If this reflected
	* object corresponds to an instance method or field then this method tests
	* if the caller can access the given {@code obj} with the reflected object.
	* For instance methods or fields then the {@code obj} argument must be an
	* instance of the {@link Member#getDeclaringClass() declaring class}. For
	* static members and constructors then {@code obj} must be {@code null}.
	*
	* <p> This method returns {@code true} if the {@code accessible} flag
	* is set to {@code true}, i.e. the checks for Java language access control
	* are suppressed, or if the caller can access the member as
	* specified in <cite>The Java Language Specification</cite>,
	* with the variation noted in the class description. </p>
	*
	* @param obj an instance object of the declaring class of this reflected
	* object if it is an instance method or field
	*
	* @return {@code true} if the caller can access this reflected object.
	*
	* @throws IllegalArgumentException
	* <ul>
	* <li> if this reflected object is a static member or constructor and
	* the given {@code obj} is non-{@code null}, or </li>
	* <li> if this reflected object is an instance method or field
	* and the given {@code obj} is {@code null} or of type
	* that is not a subclass of the {@link Member#getDeclaringClass()
	* declaring class} of the member.</li>
	* </ul>
	*
	* @since 9
	* @jls 6.6 Access Control
	* @see #trySetAccessible
	* @see #setAccessible(boolean)
	*/
	@CallerSensitive
	public final boolean canAccess(Object obj) {
	if (!Member.class.isInstance(this)) {
	return override;
	}

	Class<?> declaringClass = ((Member) this).getDeclaringClass();
	int modifiers = ((Member) this).getModifiers();
	if (!Modifier.isStatic(modifiers) &&
	(this instanceof Method \|\| this instanceof Field)) {
	if (obj == null) {
	throw new IllegalArgumentException("null object for " + this);
	}
	// if this object is an instance member, the given object
	// must be a subclass of the declaring class of this reflected object
	if (!declaringClass.isAssignableFrom(obj.getClass())) {
	throw new IllegalArgumentException("object is not an instance of "
	+ declaringClass.getName());
	}
	} else if (obj != null) {
	throw new IllegalArgumentException("non-null object for " + this);
	}

	// access check is suppressed
	if (override) return true;

	Class<?> caller = Reflection.getCallerClass();
	Class<?> targetClass;
	if (this instanceof Constructor) {
	targetClass = declaringClass;
	} else {
	targetClass = Modifier.isStatic(modifiers) ? null : obj.getClass();
	}
	return verifyAccess(caller, declaringClass, targetClass, modifiers);
	}

	/**
	* Constructor: only used by the Java Virtual Machine.
	*/
	@Deprecated(since="17")
	protected AccessibleObject() {}

	// Indicates whether language-level access checks are overridden
	// by this object. Initializes to "false". This field is used by
	// Field, Method, and Constructor.
	//
	// NOTE: for security purposes, this field must not be visible
	// outside this package.
	boolean override;

	// Reflection factory used by subclasses for creating field,
	// method, and constructor accessors. Note that this is called
	// very early in the bootstrapping process.
	@SuppressWarnings("removal")
	static final ReflectionFactory reflectionFactory =
	AccessController.doPrivileged(
	new ReflectionFactory.GetReflectionFactoryAction());

	/**
	* {@inheritDoc}
	*
	* <p> Note that any annotation returned by this method is a
	* declaration annotation.
	*
	* @implSpec
	* The default implementation throws {@link
	* UnsupportedOperationException}; subclasses should override this method.
	*
	* @throws NullPointerException {@inheritDoc}
	* @since 1.5
	*/
	@Override
	public <T extends Annotation> T getAnnotation(Class<T> annotationClass) {
	throw new UnsupportedOperationException("All subclasses should override this method");
	}

	/**
	* {@inheritDoc}
	*
	* @throws NullPointerException {@inheritDoc}
	* @since 1.5
	*/
	@Override
	public boolean isAnnotationPresent(Class<? extends Annotation> annotationClass) {
	return AnnotatedElement.super.isAnnotationPresent(annotationClass);
	}

	/**
	* {@inheritDoc}
	*
	* <p> Note that any annotations returned by this method are
	* declaration annotations.
	*
	* @implSpec
	* The default implementation throws {@link
	* UnsupportedOperationException}; subclasses should override this method.
	*
	* @throws NullPointerException {@inheritDoc}
	* @since 1.8
	*/
	@Override
	public <T extends Annotation> T[] getAnnotationsByType(Class<T> annotationClass) {
	throw new UnsupportedOperationException("All subclasses should override this method");
	}

	/**
	* {@inheritDoc}
	*
	* <p> Note that any annotations returned by this method are
	* declaration annotations.
	*
	* @since 1.5
	*/
	@Override
	public Annotation[] getAnnotations() {
	return getDeclaredAnnotations();
	}

	/**
	* {@inheritDoc}
	*
	* <p> Note that any annotation returned by this method is a
	* declaration annotation.
	*
	* @throws NullPointerException {@inheritDoc}
	* @since 1.8
	*/
	@Override
	public <T extends Annotation> T getDeclaredAnnotation(Class<T> annotationClass) {
	// Only annotations on classes are inherited, for all other
	// objects getDeclaredAnnotation is the same as
	// getAnnotation.
	return getAnnotation(annotationClass);
	}

	/**
	* {@inheritDoc}
	*
	* <p> Note that any annotations returned by this method are
	* declaration annotations.
	*
	* @throws NullPointerException {@inheritDoc}
	* @since 1.8
	*/
	@Override
	public <T extends Annotation> T[] getDeclaredAnnotationsByType(Class<T> annotationClass) {
	// Only annotations on classes are inherited, for all other
	// objects getDeclaredAnnotationsByType is the same as
	// getAnnotationsByType.
	return getAnnotationsByType(annotationClass);
	}

	/**
	* {@inheritDoc}
	*
	* <p> Note that any annotations returned by this method are
	* declaration annotations.
	*
	* @implSpec
	* The default implementation throws {@link
	* UnsupportedOperationException}; subclasses should override this method.
	*
	* @since 1.5
	*/
	@Override
	public Annotation[] getDeclaredAnnotations() {
	throw new UnsupportedOperationException("All subclasses should override this method");
	}

	// Shared access checking logic.

	// For non-public members or members in package-private classes,
	// it is necessary to perform somewhat expensive access checks.
	// If the access check succeeds for a given class, it will
	// always succeed (it is not affected by the granting or revoking
	// of permissions); we speed up the check in the common case by
	// remembering the last Class for which the check succeeded.
	//
	// The simple access check for Constructor is to see if
	// the caller has already been seen, verified, and cached.
	//
	// A more complicated access check cache is needed for Method and Field
	// The cache can be either null (empty cache), {caller,targetClass} pair,
	// or a caller (with targetClass implicitly equal to memberClass).
	// In the {caller,targetClass} case, the targetClass is always different
	// from the memberClass.
	volatile Object accessCheckCache;

	private static class Cache {
	final WeakReference<Class<?>> callerRef;
	final WeakReference<Class<?>> targetRef;

	Cache(Class<?> caller, Class<?> target) {
	this.callerRef = new WeakReference<>(caller);
	this.targetRef = new WeakReference<>(target);
	}

	boolean isCacheFor(Class<?> caller, Class<?> refc) {
	return callerRef.refersTo(caller) && targetRef.refersTo(refc);
	}

	static Object protectedMemberCallerCache(Class<?> caller, Class<?> refc) {
	return new Cache(caller, refc);
	}
	}

	/*
	* Returns true if the previous access check was verified for the
	* given caller accessing a protected member with an instance of
	* the given targetClass where the target class is different than
	* the declaring member class.
	*/
	private boolean isAccessChecked(Class<?> caller, Class<?> targetClass) {
	Object cache = accessCheckCache; // read volatile
	if (cache instanceof Cache) {
	return ((Cache) cache).isCacheFor(caller, targetClass);
	}
	return false;
	}

	/*
	* Returns true if the previous access check was verified for the
	* given caller accessing a static member or an instance member of
	* the target class that is the same as the declaring member class.
	*/
	private boolean isAccessChecked(Class<?> caller) {
	Object cache = accessCheckCache; // read volatile
	if (cache instanceof WeakReference) {
	@SuppressWarnings("unchecked")
	WeakReference<Class<?>> ref = (WeakReference<Class<?>>) cache;
	return ref.refersTo(caller);
	}
	return false;
	}

	final void checkAccess(Class<?> caller, Class<?> memberClass,
	Class<?> targetClass, int modifiers)
	throws IllegalAccessException
	{
	if (!verifyAccess(caller, memberClass, targetClass, modifiers)) {
	IllegalAccessException e = Reflection.newIllegalAccessException(
	caller, memberClass, targetClass, modifiers);
	if (printStackTraceWhenAccessFails()) {
	e.printStackTrace(System.err);
	}
	throw e;
	}
	}

	final boolean verifyAccess(Class<?> caller, Class<?> memberClass,
	Class<?> targetClass, int modifiers)
	{
	if (caller == memberClass) { // quick check
	return true; // ACCESS IS OK
	}
	if (targetClass != null // instance member or constructor
	&& Modifier.isProtected(modifiers)
	&& targetClass != memberClass) {
	if (isAccessChecked(caller, targetClass)) {
	return true; // ACCESS IS OK
	}
	} else if (isAccessChecked(caller)) {
	// Non-protected case (or targetClass == memberClass or static member).
	return true; // ACCESS IS OK
	}

	// If no return, fall through to the slow path.
	return slowVerifyAccess(caller, memberClass, targetClass, modifiers);
	}

	// Keep all this slow stuff out of line:
	private boolean slowVerifyAccess(Class<?> caller, Class<?> memberClass,
	Class<?> targetClass, int modifiers)
	{

	if (caller == null) {
	// No caller frame when a native thread attaches to the VM
	// only allow access to a public accessible member
	return Reflection.verifyPublicMemberAccess(memberClass, modifiers);
	}

	if (!Reflection.verifyMemberAccess(caller, memberClass, targetClass, modifiers)) {
	// access denied
	return false;
	}

	// Success: Update the cache.
	Object cache = (targetClass != null
	&& Modifier.isProtected(modifiers)
	&& targetClass != memberClass)
	? Cache.protectedMemberCallerCache(caller, targetClass)
	: new WeakReference<>(caller);
	accessCheckCache = cache; // write volatile
	return true;
	}

	// true to print a stack trace when access fails
	private static volatile boolean printStackWhenAccessFails;

	// true if printStack* values are initialized
	private static volatile boolean printStackPropertiesSet;

	/**
	* Returns true if a stack trace should be printed when access fails.
	*/
	private static boolean printStackTraceWhenAccessFails() {
	if (!printStackPropertiesSet && VM.initLevel() >= 1) {
	String s = GetPropertyAction.privilegedGetProperty(
	"sun.reflect.debugModuleAccessChecks");
	if (s != null) {
	printStackWhenAccessFails = !s.equalsIgnoreCase("false");
	}
	printStackPropertiesSet = true;
	}
	return printStackWhenAccessFails;
	}

	/**
	* Returns the root AccessibleObject; or null if this object is the root.
	*
	* All subclasses override this method.
	*/
	AccessibleObject getRoot() {
	throw new InternalError();
	}
	}

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