Hacktoberfest 2026：メンテナが10月に向けて印を付けた、オープンで初心者向けの issue。 Hacktoberfest の issue を見る

[BUG] IllegalAccessException: module java.base does not open java.lang to unnamed module

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  • 何か問題がありますか？
#1,878 コメント 3 件 リアクション 0 件 担当者 1 名 GitHub で見る

メンテナーはふだん 1 日以内に返信

@wenytang-ms がすでに取り組んでいます。

2026年7月6日 から。

評価

この issue はまだ評価されていません。

説明

ai-triaged gradle junit test-execution ux

I've been solving the testing problem through your extension for two days, and I've been getting this error:

org.gradle.api.GradleException: Could not inject synthetic classes.
 at org.gradle.initialization.DefaultLegacyTypesSupport.injectEmptyInterfacesIntoClassLoader([DefaultLegacyTypesSupport.java:108](vscode-file://vscode-app/e:/Users/Micro/AppData/Local/Programs/Microsoft%20VS%20Code/fcf604774b/resources/app/out/vs/code/electron-browser/workbench/workbench.html))
 at org.gradle.testfixtures.internal.ProjectBuilderImpl.getGlobalServices([ProjectBuilderImpl.java:269](vscode-file://vscode-app/e:/Users/Micro/AppData/Local/Programs/Microsoft%20VS%20Code/fcf604774b/resources/app/out/vs/code/electron-browser/workbench/workbench.html))
 at org.gradle.testfixtures.internal.ProjectBuilderImpl.createProject([ProjectBuilderImpl.java:162](vscode-file://vscode-app/e:/Users/Micro/AppData/Local/Programs/Microsoft%20VS%20Code/fcf604774b/resources/app/out/vs/code/electron-browser/workbench/workbench.html))
 at org.gradle.testfixtures.ProjectBuilder.build([ProjectBuilder.java:121](vscode-file://vscode-app/e:/Users/Micro/AppData/Local/Programs/Microsoft%20VS%20Code/fcf604774b/resources/app/out/vs/code/electron-browser/workbench/workbench.html))
 at net.furfurmc.gradle.minedeployer.tests.tasks.MineDeployTaskTest.pluginRegistersATask([MineDeployTaskTest.java:14](vscode-file://vscode-app/e:/Users/Micro/AppData/Local/Programs/Microsoft%20VS%20Code/fcf604774b/resources/app/out/vs/code/electron-browser/workbench/workbench.html))
Caused by: java.lang.RuntimeException: java.lang.IllegalAccessException: module java.base does not open java.lang to unnamed module @1a451d4d
 at org.gradle.internal.classloader.ClassLoaderUtils$AbstractClassLoaderLookuper.invoke([ClassLoaderUtils.java:156](vscode-file://vscode-app/e:/Users/Micro/AppData/Local/Programs/Microsoft%20VS%20Code/fcf604774b/resources/app/out/vs/code/electron-browser/workbench/workbench.html))
 at org.gradle.internal.classloader.ClassLoaderUtils$LookupClassDefiner.defineClass([ClassLoaderUtils.java:212](vscode-file://vscode-app/e:/Users/Micro/AppData/Local/Programs/Microsoft%20VS%20Code/fcf604774b/resources/app/out/vs/code/electron-browser/workbench/workbench.html))
 at org.gradle.internal.classloader.ClassLoaderUtils.define([ClassLoaderUtils.java:82](vscode-file://vscode-app/e:/Users/Micro/AppData/Local/Programs/Microsoft%20VS%20Code/fcf604774b/resources/app/out/vs/code/electron-browser/workbench/workbench.html))
 at org.gradle.initialization.DefaultLegacyTypesSupport.injectEmptyInterfacesIntoClassLoader([DefaultLegacyTypesSupport.java:105](vscode-file://vscode-app/e:/Users/Micro/AppData/Local/Programs/Microsoft%20VS%20Code/fcf604774b/resources/app/out/vs/code/electron-browser/workbench/workbench.html))
 ... 4 more
Caused by: java.lang.IllegalAccessException: module java.base does not open java.lang to unnamed module @1a451d4d
 at java.base/java.lang.invoke.MethodHandles.privateLookupIn([MethodHandles.java:287](vscode-file://vscode-app/e:/Users/Micro/AppData/Local/Programs/Microsoft%20VS%20Code/fcf604774b/resources/app/out/vs/code/electron-browser/workbench/workbench.html))
 at org.gradle.internal.classloader.ClassLoaderUtils$AbstractClassLoaderLookuper.getLookupForClassLoader([ClassLoaderUtils.java:165](vscode-file://vscode-app/e:/Users/Micro/AppData/Local/Programs/Microsoft%20VS%20Code/fcf604774b/resources/app/out/vs/code/electron-browser/workbench/workbench.html))
 at org.gradle.internal.classloader.ClassLoaderUtils$AbstractClassLoaderLookuper.invoke([ClassLoaderUtils.java:152](vscode-file://vscode-app/e:/Users/Micro/AppData/Local/Programs/Microsoft%20VS%20Code/fcf604774b/resources/app/out/vs/code/electron-browser/workbench/workbench.html))
 ... 7 more

With this code:

@Test
void pluginRegistersATask()
{
    // Create a test project and apply the plugin
    Project project = ProjectBuilder.builder().build();
    project.getPlugins().apply("org.example.filesizediff");

    // Verify the result
    assertNotNull(project.getTasks().findByName("fileSizeDiff"));
}

At the same time, if you run the test using the command: ./gradlew test --no-daemon, then everything runs fine.

It turned out that the problem was in the java command line arguments, I added the following parameters to the extension and it solved the problem:

"java.test.config": {
    "vmArgs": [
        "--add-opens=java.base/java.lang=ALL-UNNAMED",
        "--add-opens=java.base/java.util=ALL-UNNAMED",
        "--add-opens=java.base/java.lang.reflect=ALL-UNNAMED"
    ]
}

This bypass does not solve the problem, as unnamed java code may change from version to version.

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