This method attempts to locate, load, and link the class or interface. - * It does not run the class initializer. If the class is not found, this - * method returns {@code null}.
+ *This method attempts to locate and load the class or interface. + * It does not link the class, and does not run the class initializer. + * If the class is not found, this method returns {@code null}.
* *If the class loader of the given module defines other modules and * the given name is a class defined in a different module, this method @@ -465,6 +473,8 @@ * in a module. * * + * @jls 12.2 Loading of Classes and Interfaces + * @jls 12.3 Linking of Classes and Interfaces * @since 9 * @spec JPMS */ --- /dev/null 2019-11-14 15:52:21.000000000 -0800 +++ new/test/jdk/java/lang/Class/forName/NonLinking/Container.java 2019-11-14 15:52:20.000000000 -0800 @@ -0,0 +1,31 @@ +/* + * Copyright (c) 2019, 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. + */ + +public class Container { + + public Container(MissingClass m) {} + + public Container() { + this(new MissingClass() {}); + } +} --- /dev/null 2019-11-14 15:52:22.000000000 -0800 +++ new/test/jdk/java/lang/Class/forName/NonLinking/MissingClass.java 2019-11-14 15:52:21.000000000 -0800 @@ -0,0 +1,24 @@ +/* + * Copyright (c) 2019, 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. + */ + +public class MissingClass {} --- /dev/null 2019-11-14 15:52:23.000000000 -0800 +++ new/test/jdk/java/lang/Class/forName/NonLinking/NonLinking.java 2019-11-14 15:52:22.000000000 -0800 @@ -0,0 +1,67 @@ +/* + * Copyright (c) 2019, 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. + */ + +import java.lang.reflect.Field; +import java.net.URL; +import java.net.URLClassLoader; +import java.nio.file.Path; +import java.nio.file.Paths; + +/* + * @test + * @bug 8231924 8233091 8233272 + * @summary Confirm load (but not link) behavior of Class.forName() + * @library /test/lib + * + * @compile MissingClass.java + * @compile Container.java + * + * @run main ClassFileInstaller -jar classes.jar Container Container$1 + * + * @run main NonLinking + */ +/* + * The @compile and '@main ClassFileInstaller' tasks above create a classes.jar + * file containing the .class file for Container, but not MissingClass. + */ + +public class NonLinking { + private final static String TEST_CLASSES = System.getProperty("test.classes"); + + public static void main(String[] args) throws Throwable { + Path jarPath = Paths.get("classes.jar"); + URL url = jarPath.toUri().toURL(); + URLClassLoader ucl1 = new URLClassLoader("UCL1", + new URL[] { url }, + null); // Don't delegate + try { + // Trying to initialize Container without MissingClass -> NCDFE + Class.forName("Container", true, ucl1); + throw new RuntimeException("Missed expected NoClassDefFoundError"); + } catch (NoClassDefFoundError expected) {} + + // Loading (but not linking) Container will succeed. + // Before 8233091, this fails with NCDFE due to linking. + Class.forName("Container", false, ucl1); + } +}