undefect. CWE-407 — 63 sites patched across 27 ecosystems
Authors: russell@unturf.com · brackishbert@gmail.com · foxhop.net · TimeHexOn.com Patches, unit tests, benchmarks, whitepaper, and outreach briefs. Public domain — no copyright claimed. Use freely.
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369
test/jdk/tools/launcher/InstanceMainTest.java
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369
test/jdk/tools/launcher/InstanceMainTest.java
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/*
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* Copyright (c) 2023, 2025, 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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import java.nio.file.Files;
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import java.nio.file.Path;
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import java.util.List;
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import java.util.Objects;
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import java.util.function.Consumer;
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/**
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* @test
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* @bug 8329420
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* @summary test execution priority and behavior of main methods
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* @run main/timeout=480 InstanceMainTest
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*/
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public class InstanceMainTest extends TestHelper {
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private static final String[] SOURCES = new String[] {
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// static dominating with args
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"""
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class MainClass {
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static void main() {
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throw new AssertionError();
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}
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static void main(String[] args) {
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}
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}
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""",
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// instance dominating static
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"""
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class MainClass {
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void main(String[] args) {
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}
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static void main() {
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throw new AssertionError();
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}
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}
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""",
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// instance dominating with args
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"""
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class MainClass {
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void main() {
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throw new AssertionError();
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}
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void main(String[] args) {
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}
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}
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""",
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// instance no args
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"""
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class MainClass {
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void main() {
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}
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}
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""",
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// unnamed class static dominating with args
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"""
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static void main() {
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throw new AssertionError();
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}
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static void main(String[] args) {
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}
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""",
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// main with args dominating main without args
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"""
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void main(String[] args) {
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}
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static void main() {
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throw new AssertionError();
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}
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""",
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// unnamed class instance dominating with args
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"""
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void main() {
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throw new AssertionError();
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}
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void main(String[] args) {
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}
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""",
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// unnamed class instance main no args
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"""
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void main() {
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}
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""",
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// instance main with args dominating super
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"""
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class MainClass extends SuperClass {
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void main() {
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throw new AssertionError();
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}
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}
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class SuperClass {
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void main(String[] args) {
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}
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}
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""",
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// super instance main with args dominating
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"""
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public class MainClass extends Super {
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}
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class Super {
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public void main(String... args) {
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}
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public void main() {
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throw new AssertionError();
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}
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}
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""",
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// ignore super instance main
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"""
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public class MainClass extends Super {
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public static void main(String... args) {
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}
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}
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class Super {
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public static void main(String... args) {
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throw new AssertionError();
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}
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}
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""",
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// enum main
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"""
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enum MainClass {
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A;
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public static void main() {
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}
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}
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""",
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// record main
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"""
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record MainClass() {
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static void main() {
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System.out.println("Done!");
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}
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}
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""",
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// interface main
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"""
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interface MainClass {
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static void main() {
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System.out.println("Done!");
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}
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}
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"""
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};
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private static void testMethodOrder() throws Exception {
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for (String source : SOURCES) {
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performTest(source, true, tr -> {
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if (!tr.isOK()) {
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System.err.println(source);
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System.err.println(tr);
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throw new AssertionError();
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}
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});
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}
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}
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record TestCase(String sourceCode, boolean enablePreview, List<String> expectedOutput) {
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public TestCase(String sourceCode, List<String> expectedOutput) {
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this(sourceCode, true, expectedOutput);
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}
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}
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private static final TestCase[] EXECUTION_ORDER = new TestCase[] {
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new TestCase("""
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public class MainClass {
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public MainClass() {
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System.out.println("Constructor called!");
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}
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public static void main() {
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System.out.println("main called!");
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}
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}
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""",
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List.of("main called!")),
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new TestCase("""
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public class MainClass {
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public MainClass() {
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System.out.println("Constructor called!");
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}
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public void main() {
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System.out.println("main called!");
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}
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}
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""",
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List.of("Constructor called!", "main called!"))
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};
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private static void testExecutionOrder() throws Exception {
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for (TestCase testCase : EXECUTION_ORDER) {
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performTest(testCase.sourceCode, testCase.enablePreview(), tr -> {
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if (!Objects.equals(testCase.expectedOutput, tr.testOutput)) {
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throw new AssertionError("Unexpected output, " +
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"expected: " + testCase.expectedOutput +
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", actual: " + tr.testOutput);
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}
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});
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}
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}
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private static final TestCase[] EXECUTION_ERRORS = new TestCase[] {
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new TestCase("""
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public class MainClass {
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public MainClass() {
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System.out.println("Constructor called!");
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if (true) throw new Error();
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}
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public void main(String... args) {
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System.out.println("main called!");
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}
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}
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""",
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List.of("Constructor called!",
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"Exception in thread \"main\" java.lang.Error",
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"\tat MainClass.<init>(MainClass.java:4)")),
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new TestCase("""
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public class MainClass {
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public MainClass() {
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System.out.println("Constructor called!");
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if (true) throw new Error();
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}
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public void main() {
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System.out.println("main called!");
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}
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}
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""",
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List.of("Constructor called!",
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"Exception in thread \"main\" java.lang.Error",
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"\tat MainClass.<init>(MainClass.java:4)")),
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new TestCase("""
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public class MainClass {
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static int idx;
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public MainClass() {
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System.out.println("Constructor called!");
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if (idx++ == 0) throw new Error();
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}
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public void main(String... args) {
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System.out.println("main called!");
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}
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public void main() {
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System.out.println("main called!");
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}
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}
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""",
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List.of("Constructor called!",
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"Exception in thread \"main\" java.lang.Error",
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"\tat MainClass.<init>(MainClass.java:5)")),
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new TestCase("""
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public class MainClass {
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static {
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System.out.println("static init called!");
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if (true) throw new Error();
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}
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public static void main(String... args) {
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System.out.println("main called!");
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}
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}
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""",
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false,
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List.of("static init called!",
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"Exception in thread \"main\" java.lang.Error",
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"\tat MainClass.<clinit>(MainClass.java:4)")),
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new TestCase("""
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public class MainClass {
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static {
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System.out.println("static init called!");
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if (true) throw new Error();
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}
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public static void main(String... args) {
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System.out.println("main called!");
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}
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}
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""",
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true,
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List.of("static init called!",
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"Exception in thread \"main\" java.lang.Error",
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"\tat MainClass.<clinit>(MainClass.java:4)")),
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new TestCase("""
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public class MainClass {
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static {
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System.out.println("static init called!");
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if (true) throw new Error();
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}
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public void main(String... args) {
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System.out.println("main called!");
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}
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}
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""",
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true,
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List.of("static init called!",
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"Exception in thread \"main\" java.lang.Error",
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"\tat MainClass.<clinit>(MainClass.java:4)")),
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};
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private static void testExecutionErrors() throws Exception {
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for (TestCase testCase : EXECUTION_ERRORS) {
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performTest(testCase.sourceCode, testCase.enablePreview(), tr -> {
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for (int i = 0; i < testCase.expectedOutput.size(); i++) {
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if (i >= tr.testOutput.size() ||
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!Objects.equals(testCase.expectedOutput.get(i),
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tr.testOutput.get(i))) {
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throw new AssertionError("Unexpected output, " +
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"expected: " + testCase.expectedOutput +
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", actual: " + tr.testOutput +
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", failed comparison at index: " + i);
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}
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}
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});
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}
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}
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private static void performTest(String source, boolean enablePreview, Consumer<TestResult> validator) throws Exception {
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Path mainClass = Path.of("MainClass.java");
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Files.writeString(mainClass, source);
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var version = System.getProperty("java.specification.version");
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var previewRuntime = enablePreview ? "--enable-preview" : "-DtestNoPreview";
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var previewCompile = enablePreview ? "--enable-preview" : "-XDtestNoPreview";
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var trSource = doExec(javaCmd, previewRuntime, "--source", version, "MainClass.java");
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validator.accept(trSource);
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compile(previewCompile, "--source", version, "MainClass.java");
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String cp = mainClass.toAbsolutePath().getParent().toString();
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var trCompile = doExec(javaCmd, previewRuntime, "--class-path", cp, "MainClass");
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validator.accept(trCompile);
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}
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public static void main(String... args) throws Exception {
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testMethodOrder();
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testExecutionOrder();
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testExecutionErrors();
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}
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}
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