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Java example source code file (GetClassLoader.java)

This example Java source code file (GetClassLoader.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

class, classloader, failed, foo, getclassloader, malformedurlexception, net, network, passed, rmi, securityexception

The GetClassLoader.java Java example source code

/*
 * Copyright (c) 1999, 2012, 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 4240710
 * @summary RMIClassLoader.getClassLoader for a codebase should return the
 * same class loader that is used to load classes from that codebase (using
 * RMIClassLoader.loadClass).
 * @author Ann Wollrath
 *
 * @library ../../../testlibrary
 * @build TestLibrary Foo
 * @run main/othervm/policy=security.policy GetClassLoader
 */

import java.net.*;
import java.rmi.*;
import java.rmi.server.*;

public class GetClassLoader
{

    public static void main(String[] args) {

        System.err.println("\nTest for rfe 4240710\n");

        URL codebase1 = null;
        Class cl = null;
        ClassLoader loader = null;

        TestLibrary.suggestSecurityManager(null);

        try {
            codebase1 =
                TestLibrary.installClassInCodebase("Foo", "codebase1");
        } catch (MalformedURLException e) {
            TestLibrary.bomb(e);
        }


        /*
         * Force SecurityException for attempt to obtain a class loader
         * for a codebase that the test does not have permission to read from.
         */
        try {
            System.err.println(
                "getClassLoader for codebase that I can't read");
            loader = RMIClassLoader.getClassLoader("file:/foo");
            TestLibrary.bomb(
                "Failed: no SecurityException obtaining loader");
        } catch (MalformedURLException e) {
            System.err.println(
                "Failed: MalformedURLException getting loader");
            TestLibrary.bomb(e);
        } catch (SecurityException e) {
            System.err.println(
                "Passed: SecurityException obtaining loader");
        }

        /*
         * Verify that a specific class loaded by name via
         * RMIClassLoader.loadClass is the same as the class obtained by
         * loading that class by name through the loader obtained using
         * the RMIClassLoader.getClassLoader method.
         */
        System.err.println("load Foo from codebase1");
        try {
            cl = RMIClassLoader.loadClass(codebase1.toString(), "Foo");
        } catch (Exception e) {
            System.err.println(
                "Failed: exception loading class from codebase1");
            TestLibrary.bomb(e);
        }

        System.err.println(
            "load Foo using loader obtained using getClassLoader");
        try {
            loader = RMIClassLoader.getClassLoader(codebase1.toString());
        } catch (MalformedURLException e) {
            System.err.println(
                "Failed: MalformedURLException getting codebase1 loader");
            TestLibrary.bomb(e);
        }

        try {
            if (cl == loader.loadClass("Foo")) {
                System.err.println("Passed: Foo classes are equal");
            } else {
                TestLibrary.bomb("Failed: Foo classes are not equal");
            }
        } catch (Exception e) {
            System.err.println(
                "Failed: exception loading class from codebase1");
            TestLibrary.bomb(e);
        }

        /*
         * Force MalformedURLException by passing bogus URL to
         * getClassLoader.
         */
        try {
            loader = RMIClassLoader.getClassLoader("malformed:///URL");
            TestLibrary.bomb(
                "Failed: getClassLoader should throw MalformedURLException");
        } catch (MalformedURLException e) {
            System.err.println(
                "Passed: getClassLoader threw MalformedURLException");
        }
    }
}

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