/*
 * Copyright 2017 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package io.netty.util.internal;

import java.lang.reflect.AccessibleObject;

public final class ReflectionUtil {

    private ReflectionUtil() { }

    
Try to call AccessibleObject.setAccessible(boolean) but will catch any SecurityException and InaccessibleObjectException and return it. The caller must check if it returns null and if not handle the returned exception.
/** * Try to call {@link AccessibleObject#setAccessible(boolean)} but will catch any {@link SecurityException} and * {@link java.lang.reflect.InaccessibleObjectException} and return it. * The caller must check if it returns {@code null} and if not handle the returned exception. */
public static Throwable trySetAccessible(AccessibleObject object, boolean checkAccessible) { if (checkAccessible && !PlatformDependent0.isExplicitTryReflectionSetAccessible()) { return new UnsupportedOperationException("Reflective setAccessible(true) disabled"); } try { object.setAccessible(true); return null; } catch (SecurityException e) { return e; } catch (RuntimeException e) { return handleInaccessibleObjectException(e); } } private static RuntimeException handleInaccessibleObjectException(RuntimeException e) { // JDK 9 can throw an inaccessible object exception here; since Netty compiles // against JDK 7 and this exception was only added in JDK 9, we have to weakly // check the type if ("java.lang.reflect.InaccessibleObjectException".equals(e.getClass().getName())) { return e; } throw e; } }