CORE-57 - Surface javac diagnostics for runtime compile failures #180
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,136 @@ | ||
| /* | ||
| * Copyright 2013-2025 chronicle.software; SPDX-License-Identifier: Apache-2.0 | ||
| */ | ||
| package net.openhft.compiler; | ||
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| import org.junit.Test; | ||
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| import javax.tools.JavaCompiler; | ||
| import javax.tools.StandardJavaFileManager; | ||
| import javax.tools.ToolProvider; | ||
| import java.io.PrintWriter; | ||
| import java.io.StringWriter; | ||
| import java.util.Map; | ||
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| import static org.junit.Assert.*; | ||
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| public class CachedCompilerModuleClassLoaderReproTest { | ||
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| @Test | ||
| public void moduleLikeLoaderCanLoadClassAfterSuccessfulDefineClass() throws Exception { | ||
| ModuleLikeClassLoader loader = new ModuleLikeClassLoader(); | ||
| CachedCompiler compiler = new CachedCompiler(null, null); | ||
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| Class<?> clazz = compiler.loadFromJava(loader, | ||
| "app.Generated", | ||
| "package app; public class Generated { public int value() { return 42; } }"); | ||
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| assertEquals("app.Generated", clazz.getName()); | ||
| assertSame(clazz, loader.loadClass("app.Generated")); | ||
| assertEquals(42, clazz.getDeclaredMethod("value").invoke(clazz.getDeclaredConstructor().newInstance())); | ||
| } | ||
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| @Test | ||
| public void compileFailureForLoaderOnlyDependencyReportsJavacDiagnostics() throws Exception { | ||
| ModuleLikeClassLoader loader = new ModuleLikeClassLoader(); | ||
| defineLoaderOnlyDependency(loader); | ||
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| assertSame("Sanity check: the supplied class loader can see the dependency", | ||
| loader.loadClass("app.Dto"), | ||
| Class.forName("app.Dto", false, loader)); | ||
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| CachedCompiler compiler = new CachedCompiler(null, null); | ||
| StringWriter diagnostics = new StringWriter(); | ||
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| ClassNotFoundException thrown = assertThrows(ClassNotFoundException.class, | ||
| () -> compiler.loadFromJava(loader, | ||
| "app.GeneratedUsesDto", | ||
| "package app; public class GeneratedUsesDto { app.Dto dto; }", | ||
| new PrintWriter(diagnostics))); | ||
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| assertTrue("Thrown exception should identify compilation failure: " + thrown.getMessage(), | ||
| thrown.getMessage().contains("Compilation failed for app.GeneratedUsesDto")); | ||
| assertTrue("Thrown exception should include javac missing-symbol diagnostics: " + thrown.getMessage(), | ||
| thrown.getMessage().contains("cannot find symbol")); | ||
| assertTrue("Thrown exception should include the dependency javac could not resolve: " + thrown.getMessage(), | ||
| thrown.getMessage().contains("Dto")); | ||
| assertNotNull("Thrown exception should carry a diagnostic cause", thrown.getCause()); | ||
| assertTrue("javac diagnostics should mention the dependency that the compiler could not resolve: " | ||
| + diagnostics, | ||
| diagnostics.toString().contains("Dto")); | ||
| assertNull("The generated class should not have been defined after javac failure", | ||
| loader.findLoaded("app.GeneratedUsesDto")); | ||
| } | ||
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| @Test | ||
| public void successfulCompileWithoutRequestedClassReportsMissingOutput() { | ||
| ModuleLikeClassLoader loader = new ModuleLikeClassLoader(); | ||
| CachedCompiler compiler = new CachedCompiler(null, null); | ||
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| ClassNotFoundException thrown = assertThrows(ClassNotFoundException.class, | ||
| () -> compiler.loadFromJava(loader, | ||
| "app.Expected", | ||
| "package app; class Different {}")); | ||
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| assertTrue("Thrown exception should identify the missing requested class: " + thrown.getMessage(), | ||
| thrown.getMessage().contains("Compilation did not produce requested class app.Expected")); | ||
| assertTrue("Thrown exception should identify the class javac actually produced: " + thrown.getMessage(), | ||
| thrown.getMessage().contains("app.Different")); | ||
| assertNotNull("Thrown exception should carry a diagnostic cause", thrown.getCause()); | ||
| assertNull("The requested class should not have been defined", | ||
| loader.findLoaded("app.Expected")); | ||
| } | ||
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| private static void defineLoaderOnlyDependency(ModuleLikeClassLoader loader) throws Exception { | ||
| JavaCompiler javac = ToolProvider.getSystemJavaCompiler(); | ||
| assertNotNull("System compiler required", javac); | ||
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| try (StandardJavaFileManager standardManager = javac.getStandardFileManager(null, null, null)) { | ||
| CachedCompiler bytecodeCompiler = new CachedCompiler(null, null); | ||
| MyJavaFileManager fileManager = new MyJavaFileManager(standardManager); | ||
| Map<String, byte[]> classes = bytecodeCompiler.compileFromJava( | ||
| "app.Dto", | ||
| "package app; public class Dto {}", | ||
| fileManager); | ||
| byte[] dtoBytes = classes.get("app.Dto"); | ||
| assertNotNull(dtoBytes); | ||
| CompilerUtils.defineClass(loader, "app.Dto", dtoBytes); | ||
| } | ||
| } | ||
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| private static final class ModuleLikeClassLoader extends ClassLoader { | ||
| private static final String APP_PREFIX = "app."; | ||
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| ModuleLikeClassLoader() { | ||
| super(CachedCompilerModuleClassLoaderReproTest.class.getClassLoader()); | ||
| } | ||
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| @Override | ||
| public Class<?> loadClass(String name) throws ClassNotFoundException { | ||
| return loadClass(name, false); | ||
| } | ||
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| @Override | ||
| protected Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException { | ||
| if (!name.startsWith(APP_PREFIX)) { | ||
| return super.loadClass(name, resolve); | ||
| } | ||
| return findClass(name, resolve); | ||
| } | ||
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| private Class<?> findClass(String name, boolean resolve) throws ClassNotFoundException { | ||
| Class<?> loaded = findLoadedClass(name); | ||
| if (loaded != null) { | ||
| if (resolve) { | ||
| resolveClass(loaded); | ||
| } | ||
| return loaded; | ||
| } | ||
| throw new ClassNotFoundException(name + " from [Module \"deployment.repro.war\" from Service Module Loader]"); | ||
| } | ||
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| Class<?> findLoaded(String name) { | ||
| return findLoadedClass(name); | ||
| } | ||
| } | ||
| } |
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should this be
loadedClasses.put(className, clazz = classLoader.loadClass(className));?