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Don't detect main method from launcher classes
Update `MainMethod` discovery so that launcher classes from the `org.springframework.boot.loader` code are not considered. This restores the behavior of Spring Boot 2.7.11 and allows remote restart of uber jars without pulling the loader classes into the `RestartClassLoader`. Fixes gh-39733
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@ -1,5 +1,5 @@
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/*
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/*
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* Copyright 2012-2023 the original author or authors.
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* Copyright 2012-2024 the original author or authors.
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*
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* you may not use this file except in compliance with the License.
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@ -43,7 +43,7 @@ class MainMethod {
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StackTraceElement[] stackTrace = thread.getStackTrace();
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StackTraceElement[] stackTrace = thread.getStackTrace();
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for (int i = stackTrace.length - 1; i >= 0; i--) {
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for (int i = stackTrace.length - 1; i >= 0; i--) {
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StackTraceElement element = stackTrace[i];
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StackTraceElement element = stackTrace[i];
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if ("main".equals(element.getMethodName())) {
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if ("main".equals(element.getMethodName()) && !isLoaderClass(element.getClassName())) {
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Method method = getMainMethod(element);
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Method method = getMainMethod(element);
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if (method != null) {
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if (method != null) {
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return method;
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return method;
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@ -53,6 +53,10 @@ class MainMethod {
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throw new IllegalStateException("Unable to find main method");
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throw new IllegalStateException("Unable to find main method");
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}
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}
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private boolean isLoaderClass(String className) {
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return className.startsWith("org.springframework.boot.loader.");
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}
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private Method getMainMethod(StackTraceElement element) {
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private Method getMainMethod(StackTraceElement element) {
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try {
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try {
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Class<?> elementClass = Class.forName(element.getClassName());
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Class<?> elementClass = Class.forName(element.getClassName());
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@ -1,5 +1,5 @@
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/*
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/*
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* Copyright 2012-2023 the original author or authors.
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* Copyright 2012-2024 the original author or authors.
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*
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* you may not use this file except in compliance with the License.
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@ -21,6 +21,7 @@ import java.lang.reflect.Method;
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import org.junit.jupiter.api.BeforeEach;
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import org.junit.jupiter.api.BeforeEach;
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import org.junit.jupiter.api.Test;
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import org.junit.jupiter.api.Test;
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import org.springframework.boot.loader.launch.FakeJarLauncher;
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import org.springframework.util.ReflectionUtils;
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import org.springframework.util.ReflectionUtils;
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import static org.assertj.core.api.Assertions.assertThat;
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import static org.assertj.core.api.Assertions.assertThat;
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@ -64,6 +65,15 @@ class MainMethodTests {
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assertThat(method.getDeclaringClassName()).isEqualTo(nestedMain.getDeclaringClass().getName());
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assertThat(method.getDeclaringClassName()).isEqualTo(nestedMain.getDeclaringClass().getName());
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}
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}
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@Test // gh-39733
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void vaiJarLauncher() throws Exception {
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FakeJarLauncher.action = (args) -> Valid.main(args);
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MainMethod method = new TestThread(FakeJarLauncher::main).test();
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Method expectedMain = Valid.class.getMethod("main", String[].class);
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assertThat(method.getMethod()).isEqualTo(expectedMain);
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assertThat(method.getDeclaringClassName()).isEqualTo(expectedMain.getDeclaringClass().getName());
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}
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@Test
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@Test
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void missingArgsMainMethod() {
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void missingArgsMainMethod() {
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assertThatIllegalStateException().isThrownBy(() -> new TestThread(MissingArgs::main).test())
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assertThatIllegalStateException().isThrownBy(() -> new TestThread(MissingArgs::main).test())
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@ -0,0 +1,38 @@
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/*
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* Copyright 2012-2024 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.springframework.boot.loader.launch;
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import java.util.function.Consumer;
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/**
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* Fake launcher in the {@code org.springframework.boot.loader.launch} package used in
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* {@code MainMethodTests}.
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*
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* @author Phillip Webb
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*/
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public final class FakeJarLauncher {
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public static Consumer<String[]> action;
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private FakeJarLauncher() {
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}
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public static void main(String... args) {
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action.accept(args);
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}
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}
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