e72c197aa3
Motivation: Reflective setAccessible(true) will produce scary warnings on the console when using java9+, while netty still works. That said users may feel uncomfortable with these warnings, we should not try to do it by default when using java9+. Modifications: Add io.netty.tryReflectionSetAccessible system property which controls if setAccessible(...) will be used. By default it will bet set to false when using java9+. Result: Fixes [#7254].
53 lines
2.0 KiB
Java
53 lines
2.0 KiB
Java
/*
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* Copyright 2017 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.util.internal;
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import java.lang.reflect.AccessibleObject;
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public final class ReflectionUtil {
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private ReflectionUtil() { }
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/**
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* Try to call {@link AccessibleObject#setAccessible(boolean)} but will catch any {@link SecurityException} and
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* {@link java.lang.reflect.InaccessibleObjectException} and return it.
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* The caller must check if it returns {@code null} and if not handle the returned exception.
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*/
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public static Throwable trySetAccessible(AccessibleObject object, boolean checkAccessible) {
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if (checkAccessible && !PlatformDependent0.isExplicitTryReflectionSetAccessible()) {
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return new UnsupportedOperationException("Reflective setAccessible(true) disabled");
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}
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try {
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object.setAccessible(true);
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return null;
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} catch (SecurityException e) {
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return e;
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} catch (RuntimeException e) {
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return handleInaccessibleObjectException(e);
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}
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}
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private static RuntimeException handleInaccessibleObjectException(RuntimeException e) {
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// JDK 9 can throw an inaccessible object exception here; since Netty compiles
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// against JDK 7 and this exception was only added in JDK 9, we have to weakly
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// check the type
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if ("java.lang.reflect.InaccessibleObjectException".equals(e.getClass().getName())) {
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return e;
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}
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throw e;
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}
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}
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