8268250: Class.arrayType() for a 255-d array throws undocumented IllegalArgumentException
Reviewed-by: sundar, alanb
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@ -4485,12 +4485,21 @@ public final class Class<T> implements java.io.Serializable,
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* Returns a {@code Class} for an array type whose component type
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* is described by this {@linkplain Class}.
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*
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* @throws UnsupportedOperationException if this component type is {@linkplain
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* Void#TYPE void} or if the number of dimensions of the resulting array
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* type would exceed 255.
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* @return a {@code Class} describing the array type
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* @jvms 4.3.2 Field Descriptors
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* @jvms 4.4.1 The {@code CONSTANT_Class_info} Structure
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* @since 12
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*/
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@Override
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public Class<?> arrayType() {
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return Array.newInstance(this, 0).getClass();
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try {
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return Array.newInstance(this, 0).getClass();
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} catch (IllegalArgumentException iae) {
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throw new UnsupportedOperationException(iae);
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}
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}
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/**
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49
test/jdk/java/lang/Class/ArrayType.java
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49
test/jdk/java/lang/Class/ArrayType.java
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@ -0,0 +1,49 @@
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/*
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* Copyright (c) 2021, 2022, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @bug 8268250
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* @summary Check exceptional behavior of Class.arrayType
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*/
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import java.lang.reflect.*;
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import java.util.function.*;
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public class ArrayType {
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public static void main(String... args) {
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expectException(() -> Void.TYPE);
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expectException(() -> Array.newInstance(int.class, new int[255])
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.getClass());
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}
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private static void expectException(Supplier<Class<?>> arrayTypeArg) {
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try {
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Class<?> arrayClazz = arrayTypeArg.get().arrayType();
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throw new RuntimeException("Expected exception not thrown: " +
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arrayClazz);
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} catch (UnsupportedOperationException uoe) {
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; // Expected
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}
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}
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}
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