/* * Copyright (c) 2023, 2025, 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. * * 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. */ /** * @test * @bug 8310242 8328874 * @run junit ForNameNames * @summary Verify class names for Class.forName */ import java.util.stream.Stream; import org.junit.jupiter.api.Test; import org.junit.jupiter.params.ParameterizedTest; import org.junit.jupiter.params.provider.Arguments; import org.junit.jupiter.params.provider.MethodSource; import static org.junit.jupiter.api.Assertions.*; public class ForNameNames { //Max length in Modified UTF-8 bytes for class names. private static final int JAVA_CLASSNAME_MAX_LEN = 65535; private static final String ONE_BYTE = "A"; // 1-byte UTF-8 private static final String TWO_BYTE = "\u0100"; // 2-byte UTF-8 private static final String THREE_BYTE = "\u2600"; // 3-byte UTF-8 private static final String ERR_MSG_IN_CORE = "Class name length exceeds limit of"; // check in corelib private static final String ERR_MSG_IN_JVM = "Class name exceeds maximum length"; // check in jvm static class Inner {} static Stream testCases() { return Stream.of( Arguments.of("java.lang.String", String.class), Arguments.of("[Ljava.lang.String;", String[].class), Arguments.of("ForNameNames$Inner", Inner.class), Arguments.of("[LForNameNames$Inner;", Inner[].class), Arguments.of("[[I", int[][].class) ); } /* * Test 1-arg and 3-arg Class::forName. Class::getName on the returned * Class object returns the name passed to Class::forName. */ @ParameterizedTest @MethodSource("testCases") void testForName(String cn, Class expected) throws ClassNotFoundException { ClassLoader loader = ForNameNames.class.getClassLoader(); Class c1 = Class.forName(cn, false, loader); assertEquals(expected, c1); assertEquals(cn, c1.getName()); Class c2 = Class.forName(cn); assertEquals(expected, c2); assertEquals(cn, c2.getName()); } static Stream invalidNames() { return Stream.of( Arguments.of("I"), // primitive type Arguments.of("int[]"), // fully-qualified name of int array Arguments.of("ForNameNames.Inner"), // fully-qualified name of nested type Arguments.of("[java.lang.String"), // missing L and ; Arguments.of("[Ljava.lang.String"), // missing ; Arguments.of("[Ljava/lang/String;") // type descriptor ); } @ParameterizedTest @MethodSource("invalidNames") void testInvalidNames(String cn) { ClassLoader loader = ForNameNames.class.getClassLoader(); assertThrows(ClassNotFoundException.class, () -> Class.forName(cn, false, loader)); } @Test void testModule() { // Class.forName(Module, String) does not allow class name for array types Class c = Class.forName(Object.class.getModule(), "[Ljava.lang.String;"); assertNull(c); } static Stream validLen() { return Stream.of( // 1-byte character Arguments.of(ONE_BYTE.repeat(JAVA_CLASSNAME_MAX_LEN - 1)), Arguments.of(ONE_BYTE.repeat(JAVA_CLASSNAME_MAX_LEN)), Arguments.of(ONE_BYTE.repeat(JAVA_CLASSNAME_MAX_LEN / 3 - 1)), Arguments.of(ONE_BYTE.repeat(JAVA_CLASSNAME_MAX_LEN / 3)), Arguments.of(ONE_BYTE.repeat(JAVA_CLASSNAME_MAX_LEN / 3 + 1)), // 2-byte characters Arguments.of(TWO_BYTE.repeat(JAVA_CLASSNAME_MAX_LEN / 2)), Arguments.of(TWO_BYTE.repeat(JAVA_CLASSNAME_MAX_LEN / 6)), Arguments.of(TWO_BYTE.repeat(JAVA_CLASSNAME_MAX_LEN / 6 + 1)), // 3-byte characters Arguments.of(THREE_BYTE.repeat(JAVA_CLASSNAME_MAX_LEN / 3 - 1)), Arguments.of(THREE_BYTE.repeat(JAVA_CLASSNAME_MAX_LEN / 3)), Arguments.of(THREE_BYTE.repeat(JAVA_CLASSNAME_MAX_LEN / 9)), Arguments.of(THREE_BYTE.repeat(JAVA_CLASSNAME_MAX_LEN / 9 + 1)) ); } /* * Test class name length handling in 1-arg and 3-arg Class::forName * with valid length. */ @ParameterizedTest @MethodSource("validLen") void testValidLen(String cn) { ClassLoader loader = ForNameNames.class.getClassLoader(); // 3-arg Class.forName ClassNotFoundException ex = assertThrows(ClassNotFoundException.class, () -> Class.forName(cn, false, loader)); assertFalse(ex.getMessage().contains(ERR_MSG_IN_CORE) || ex.getMessage().contains(ERR_MSG_IN_JVM), "Unexpected exception message"); // 1-arg Class.forName ex = assertThrows(ClassNotFoundException.class, () -> Class.forName(cn)); assertFalse(ex.getMessage().contains(ERR_MSG_IN_CORE) || ex.getMessage().contains(ERR_MSG_IN_JVM), "Unexpected exception message"); } static Stream invalidLen() { return Stream.of( // 1-byte characters over the limit Arguments.of(ONE_BYTE.repeat(JAVA_CLASSNAME_MAX_LEN + 1)), // 2-byte characters over the limit Arguments.of(TWO_BYTE.repeat(JAVA_CLASSNAME_MAX_LEN / 2 + 1)), // 3-byte characters over the limit Arguments.of(THREE_BYTE.repeat(JAVA_CLASSNAME_MAX_LEN / 3 + 1)) ); } /* * Test class name length handling in 1-arg and 3-arg Class::forName * with invalid (too long) length. */ @ParameterizedTest @MethodSource("invalidLen") void testInvalidLen(String cn) { ClassLoader loader = ForNameNames.class.getClassLoader(); // 3-arg Class.forName ClassNotFoundException ex = assertThrows(ClassNotFoundException.class, () -> Class.forName(cn, false, loader)); assertTrue(ex.getMessage().contains(ERR_MSG_IN_CORE), "Unexpected exception message"); // 1-arg Class.forName ex = assertThrows(ClassNotFoundException.class, () -> Class.forName(cn)); assertTrue(ex.getMessage().contains(ERR_MSG_IN_CORE), "Unexpected exception message"); } }